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Dr. Dimitrios Papoulis
Geology Department, University of Patras, 26504 Rio Patras, Greece

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Research Keywords & Expertise

0 Photocatalysis
0 Nanogeoscience
0 Clays and clay minerals
0 Clay-based nanocomposites
0 Mineral adsorbents for water pollutants

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Clay minerals as drug delivery systems
Photocatalysis
Clay-based nanocomposites

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Journal article
Published: 02 August 2021 in Pharmaceutics
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Pharmaceutical grade bentonite, containing a high amount of montmorillonite, enriched with zinc (Zn) or copper (Cu) (ZnBent and CuBent, respectively) was used as the main component for the creation of formulations for cutaneous use and tested for their antimicrobial capacity. Bentonite (Bent) with added phenoxyethanol (PH) as a preservative and unmodified bentonite were used as control groups. The mineralogical composition, structural state, and physical or chemical properties, before and after the modification of the samples, were characterized utilizing X-ray Diffraction Analysis (XRD), Fourier-Transform Infrared Spectroscopy (FTIR) and X-ray Fluorescence (XRF) techniques, and Scanning Electron Microscope-Energy Dispersive Spectroscopy (SEM, SEM-EDS) analyses. In addition, the profile of zinc and copper concentration from two types of surfaces ZnBent and CuBent, and into Phosphate-Buffered Saline (PBS) are discussed. Finally, the formulations in the form of basic pastes were challenged against bacteria, molds, and yeasts, and their performance was evaluated based on the European Pharmacopeia criteria. The Cu-modified bentonite performed excellently against bacteria and yeasts, while the Zn-modified bentonite only showed great results against yeasts. Therefore, Cu-modified bentonite formulations could offer antimicrobial protection without the use of preservatives.

ACS Style

Fotini Martsouka; Konstantinos Papagiannopoulos; Sophia Hatziantoniou; Martin Barlog; Giorgos Lagiopoulos; Triantafyllos Tatoulis; Athanasia Tekerlekopoulou; Paraskevi Lampropoulou; Dimitrios Papoulis. The Antimicrobial Properties of Modified Pharmaceutical Bentonite with Zinc and Copper. Pharmaceutics 2021, 13, 1190 .

AMA Style

Fotini Martsouka, Konstantinos Papagiannopoulos, Sophia Hatziantoniou, Martin Barlog, Giorgos Lagiopoulos, Triantafyllos Tatoulis, Athanasia Tekerlekopoulou, Paraskevi Lampropoulou, Dimitrios Papoulis. The Antimicrobial Properties of Modified Pharmaceutical Bentonite with Zinc and Copper. Pharmaceutics. 2021; 13 (8):1190.

Chicago/Turabian Style

Fotini Martsouka; Konstantinos Papagiannopoulos; Sophia Hatziantoniou; Martin Barlog; Giorgos Lagiopoulos; Triantafyllos Tatoulis; Athanasia Tekerlekopoulou; Paraskevi Lampropoulou; Dimitrios Papoulis. 2021. "The Antimicrobial Properties of Modified Pharmaceutical Bentonite with Zinc and Copper." Pharmaceutics 13, no. 8: 1190.

Journal article
Published: 02 March 2021 in Materials
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Six pharmaceutical pastes were prepared using chemically modified kaolin and talc powders. Tests were conducted to determine their structural and chemical characteristics as well as their antimicrobial protection, thus rendering them suitable for cosmetic and pharmaceutical uses. Kaolin and talc were treated chemically via the cation exchange method to load the clay particles with copper and zinc ions, two cations well known for their antimicrobial properties. Mineralogical analyses were conducted by using X-ray diffraction (XRD) before and after the modification, confirming the mineralogical purity of the samples. Scanning electron microscopy was also used in conjunction with energy dispersed spectroscopy (SEM-EDS) to obtain chemical mapping images, revealing the dispersion of the added metals upon the clay minerals surfaces. Moreover, chemical analysis has been performed (XRF) to validate the enrichment of the clays with each metal utilizing the cation exchange capacity. All modified samples showed the expected elevated concentration in copper or zinc in comparison to their unmodified versions. From the X-ray photoelectron spectroscopy (XPS), the chemical state of the samples’ surfaces was investigated, revealing the presence of salt compounds and indicating the oxidation state of adsorbed metals. Finally, the resistance of pastes in microbial growth when challenged with bacteria, molds, and yeasts was assessed. The evaluation is based on the European Pharmacopeia (EP) criteria.

ACS Style

Fotini Martsouka; Konstantinos Papagiannopoulos; Sophia Hatziantoniou; Martin Barlog; Giorgos Lagiopoulos; Athanasia Tekerlekopoulou; Dimitrios Papoulis. Evaluation of the Antimicrobial Protection of Pharmaceutical Kaolin and Talc Modified with Copper and Zinc. Materials 2021, 14, 1173 .

AMA Style

Fotini Martsouka, Konstantinos Papagiannopoulos, Sophia Hatziantoniou, Martin Barlog, Giorgos Lagiopoulos, Athanasia Tekerlekopoulou, Dimitrios Papoulis. Evaluation of the Antimicrobial Protection of Pharmaceutical Kaolin and Talc Modified with Copper and Zinc. Materials. 2021; 14 (5):1173.

Chicago/Turabian Style

Fotini Martsouka; Konstantinos Papagiannopoulos; Sophia Hatziantoniou; Martin Barlog; Giorgos Lagiopoulos; Athanasia Tekerlekopoulou; Dimitrios Papoulis. 2021. "Evaluation of the Antimicrobial Protection of Pharmaceutical Kaolin and Talc Modified with Copper and Zinc." Materials 14, no. 5: 1173.

Journal article
Published: 21 December 2020 in Pharmaceutics
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Silver nanoparticles (AgNPs) were synthesized using hydroalcoholic extracts of dittany (Origanum dictamnus), sage (Salvia officinalis), sea buckthorn (Elaeagnus rhamnoides, syn. Hippophae rhamnoides), and calendula (Calendula officinalis) as reducing agents. AgNPs synthesized using NaBH4 and citric acid were used as control. The impact of the origin of the extract and preparation conditions (light, temperature, reaction time) on the properties of the synthesized AgNPs was investigated. The structure, morphology, composition, physicochemical characteristics, and colloidal stability were characterized using dynamic laser scattering (DLS), ultraviolet-visible spectrophotometry (UV–/Vis), XRD, X-ray fluorescence (XRF), TEM, and FTΙR. The reduction of total phenolic and flavonoid content of the extracts after the reaction of AgNPs synthesis was also determined. Low IC50 values for all types of AgNPs revealed good antioxidant activity, attributable to the phenolic and flavonoid content of their surface. The results suggest that plant extract selection is important to the green synthesis of AgNPs because it affects the kinetics of their synthesis as well as their morphology, physicochemical characteristics, and colloidal stability. In vitro permeation studies on porcine skin revealed that AgNPs remained at the upper layers of stratum corneum and did not penetrate the skin barrier after 4 h of cutaneous application suggesting the safety of their application on intact skin for a relatively short time.

ACS Style

Ioanna K. Siakavella; Fotini Lamari; Dimitrios Papoulis; Malvina Orkoula; Patroula Gkolfi; Michail Lykouras; Konstantinos Avgoustakis; Sophia Hatziantoniou. Effect of Plant Extracts on the Characteristics of Silver Nanoparticles for Topical Application. Pharmaceutics 2020, 12, 1244 .

AMA Style

Ioanna K. Siakavella, Fotini Lamari, Dimitrios Papoulis, Malvina Orkoula, Patroula Gkolfi, Michail Lykouras, Konstantinos Avgoustakis, Sophia Hatziantoniou. Effect of Plant Extracts on the Characteristics of Silver Nanoparticles for Topical Application. Pharmaceutics. 2020; 12 (12):1244.

Chicago/Turabian Style

Ioanna K. Siakavella; Fotini Lamari; Dimitrios Papoulis; Malvina Orkoula; Patroula Gkolfi; Michail Lykouras; Konstantinos Avgoustakis; Sophia Hatziantoniou. 2020. "Effect of Plant Extracts on the Characteristics of Silver Nanoparticles for Topical Application." Pharmaceutics 12, no. 12: 1244.

Journal article
Published: 01 August 2020 in European Journal of Pharmaceutics and Biopharmaceutics
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The clay minerals are characterized as important minerals due to their specific properties. One of the most important groups of the clay minerals is the kaolinite’s group minerals due to their morphology, availability and range of potential applications. Halloysite and kaolinite are investigated here for their pharmaceutical applications and especially for their potential in cancer treatment. This review study is focusing on the potential applications of the kaolinite’s group minerals in cancer diagnosis and monitoring, cancer treatment, the avoidance of metastasis, and the relief of cancer pains. Anticancer drug-loaded formulations based on these minerals show high potential for the treatment of various types of cancer as they have been shown to exhibit high anticancer activity in cancer cell lines and cancer animal models, high biocompatibility, low side effects, and high drug bioavailability.

ACS Style

Eleni Gianni; Konstantinos Avgoustakis; Dimitrios Papoulis. Kaolinite group minerals: Applications in cancer diagnosis and treatment. European Journal of Pharmaceutics and Biopharmaceutics 2020, 154, 359 -376.

AMA Style

Eleni Gianni, Konstantinos Avgoustakis, Dimitrios Papoulis. Kaolinite group minerals: Applications in cancer diagnosis and treatment. European Journal of Pharmaceutics and Biopharmaceutics. 2020; 154 ():359-376.

Chicago/Turabian Style

Eleni Gianni; Konstantinos Avgoustakis; Dimitrios Papoulis. 2020. "Kaolinite group minerals: Applications in cancer diagnosis and treatment." European Journal of Pharmaceutics and Biopharmaceutics 154, no. : 359-376.

Journal article
Published: 21 March 2020 in Minerals
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The presence or the absence of swelling clay minerals in rocks, which are used in various construction applications, constitutes a determinant factor for their strength, and consequently, in their general behavior in various construction applications, as they have the ability to swell up to 400 times of their usual volume, causing failures to any application in which they participate. The aim of this study is to respond to the question of whether the empirical method of methylene blue yields equally safe and correct results in different types of igneous rocks and if not, which is the determining factor affecting the results. The answer to this complex question is feasible by investigating the microscopic structure and the mineralogy of the studied rocks, and particularly, using the content of specific phyllosilicate minerals which may be related or not with the methylene blue values. According to the results, the methylene blue test seems to work correctly for the intermediate (Group I) and mafic (Group II) examined rocks, but it seems to be wrong for the highly serpentinized ultramafic rocks (up to 70% of serpentine) (Group III).

ACS Style

Panagiota P. Giannakopoulou; Petros Petrounias; Aikaterini Rogkala; Paraskevi Lampropoulou; Eleni Gianni; Dimitrios Papoulis; Petros Koutsovitis; Basilios Tsikouras; Konstantin Hatzipanagiotou. Does the Methylene Blue Test Give Equally Satisfactory Results in All Studied Igneous Rocks Relative to the Identification of Swelling Clay Minerals? Minerals 2020, 10, 283 .

AMA Style

Panagiota P. Giannakopoulou, Petros Petrounias, Aikaterini Rogkala, Paraskevi Lampropoulou, Eleni Gianni, Dimitrios Papoulis, Petros Koutsovitis, Basilios Tsikouras, Konstantin Hatzipanagiotou. Does the Methylene Blue Test Give Equally Satisfactory Results in All Studied Igneous Rocks Relative to the Identification of Swelling Clay Minerals? Minerals. 2020; 10 (3):283.

Chicago/Turabian Style

Panagiota P. Giannakopoulou; Petros Petrounias; Aikaterini Rogkala; Paraskevi Lampropoulou; Eleni Gianni; Dimitrios Papoulis; Petros Koutsovitis; Basilios Tsikouras; Konstantin Hatzipanagiotou. 2020. "Does the Methylene Blue Test Give Equally Satisfactory Results in All Studied Igneous Rocks Relative to the Identification of Swelling Clay Minerals?" Minerals 10, no. 3: 283.

Journal article
Published: 06 June 2019 in Applied Clay Science
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Un-exchanged and Zn or Cu ion exchanged samples of a newly discovered sepiolite clay from Greece were combined with nanophase anatase titania for the synthesis of sepiolite based nanocomposites and tested for oxidation of NOx gases. The Zn or Cu ion exchanged clay was modified by replacing the exchangeable cations with Zn or Cu ions. Three separate single phase sepiolite samples were prepared, i.e., the sepiolite (S), the one modified with Zn (Zn-S) and the one modified with Cu (Cu-S). Additionally, three nanocomposites were synthesized combining the above three sepiolite samples with TiO2 in weight ratios of 30:70 and named S-TiO2, Zn-S-TiO2 and Cu-S-TiO2, respectively by depositing TiO2 (anatase) on the sepiolite surfaces using titanium isopropoxide as a precursor under hydrothermal treatment at 180 °C. The phase composition, particle morphology and physical properties of the sepiolite samples and the nanocomposites were characterized by XRD, ATR-FTIR, TEM, DRS-UV–Vis and N2-sorption/desorption analyses. The photocatalytic activity of all the clay mineral-titania nanocomposites was examined in the decomposition NOx gases. Sepiolite and especially Zn modified sepiolite based nanocomposites showed better photocatalytic activity for the oxidation of NOx gases compared to that of reference photocatalyst titania P25 under UV-light irradiation.

ACS Style

D. Papoulis; K. Somalakidi; Nadia Todorova; C. Trapalis; D. Panagiotaras; Dimitra Sygkridou; E. Stathatos; E. Gianni; A. Mavrikos; S. Komarneni. Sepiolite/TiO2 and metal ion modified sepiolite/TiO2 nanocomposites: synthesis, characterization and photocatalytic activity in abatement of NOx gases. Applied Clay Science 2019, 179, 105156 .

AMA Style

D. Papoulis, K. Somalakidi, Nadia Todorova, C. Trapalis, D. Panagiotaras, Dimitra Sygkridou, E. Stathatos, E. Gianni, A. Mavrikos, S. Komarneni. Sepiolite/TiO2 and metal ion modified sepiolite/TiO2 nanocomposites: synthesis, characterization and photocatalytic activity in abatement of NOx gases. Applied Clay Science. 2019; 179 ():105156.

Chicago/Turabian Style

D. Papoulis; K. Somalakidi; Nadia Todorova; C. Trapalis; D. Panagiotaras; Dimitra Sygkridou; E. Stathatos; E. Gianni; A. Mavrikos; S. Komarneni. 2019. "Sepiolite/TiO2 and metal ion modified sepiolite/TiO2 nanocomposites: synthesis, characterization and photocatalytic activity in abatement of NOx gases." Applied Clay Science 179, no. : 105156.

Journal article
Published: 06 May 2019 in Journal of Drug Delivery Science and Technology
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Halloysite, a clay mineral with spiral-shape tubular crystal morphology and biocompatibility with the human body, could be applied for the encapsulation of various bioactive molecules, serving as a controlled drug delivery nanocarrier. In this work, halloysite nanotubes have been investigated as a potential drug delivery system of irinotecan for colon cancer treatment administered by the oral route. The irinotecan-loaded halloysite nanotubes were coated with Eudragit S100 anionic copolymer in order to control and limit the drug release in the stomach pH while allowing it in the intestinal environment. The entrapment efficiency of the irinotecan in the halloysite nanotubes was very high, reaching 84.42 ± 3.10%. Transmission electron microscopy indicated that the drug molecules are located on the surface of the halloysite nanotubes and, as X-ray diffraction patterns confirmed, they were not positioned between the individual layers of halloysite nanotube. Thermogravimetric analysis indicated drug loading levels similar to that obtained spectrophotometrically and that the halloysite:polymer weight ratio in the polymer-coated samples was similar to the respective feed weight ratio (75:25). The drug release rate from the polymer-coated nanotubes was minimal (0.7% in 2 h) at stomach pH (pH 1.2) and high at intestinal pH 7.4 conditions (when the pH was increased to 7.4, drug release increased by approx. 70% in 2 h). The classical atomistic molecular simulation methods were used for the characterization of the mutual interactions in the modeled structure between the irinotecan cations and the halloysite nanotube at release pH value (pH 7.4). According to the geometry optimization results, the drug molecules (cations) remain closer to the outer part of the halloysite nanotubes. Longitudinal axes of the adjacent drug cations are positioned along the longitudinal axis of the tube and based on the calculations, these positions are energetically preferred. Based on molecular mechanics and molecular dynamics simulations, the preferred number of the drug cations loaded in a model of 5 ring-halloysite tube with a length of 25.359 Å is 6, and this number of cations is in agreement with the molar weight ratio of the components measured in real samples.

ACS Style

Eleni Gianni; Konstantinos Avgoustakis; Milan Pšenička; Miroslav Pospíšil; Dimitrios Papoulis. Halloysite nanotubes as carriers for irinotecan: Synthesis and characterization by experimental and molecular simulation methods. Journal of Drug Delivery Science and Technology 2019, 52, 568 -576.

AMA Style

Eleni Gianni, Konstantinos Avgoustakis, Milan Pšenička, Miroslav Pospíšil, Dimitrios Papoulis. Halloysite nanotubes as carriers for irinotecan: Synthesis and characterization by experimental and molecular simulation methods. Journal of Drug Delivery Science and Technology. 2019; 52 ():568-576.

Chicago/Turabian Style

Eleni Gianni; Konstantinos Avgoustakis; Milan Pšenička; Miroslav Pospíšil; Dimitrios Papoulis. 2019. "Halloysite nanotubes as carriers for irinotecan: Synthesis and characterization by experimental and molecular simulation methods." Journal of Drug Delivery Science and Technology 52, no. : 568-576.

Review
Published: 17 November 2018 in Applied Clay Science
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Heterogeneous photocatalysis is an efficient, relatively cheap and environmentally friendly technology for decomposing various organic and air pollutants. Halloysite is a natural clay mineral usually in the form of nanotubes that has many applications as well as potential uses including photocatalysis. In this paper the photocatalytic activities of halloysite-based nanocomposites in combination with various photocatalysts that have been synthesized and tested in decomposing organic and air pollutants are reviewed. Many photocatalysts have been synthesized and among them TiO2 in the form of anatase, or rutile, or a mixture of both is the most common photocatalyst due to its effectiveness and low cost. Researches by many investigators are summarized and discussed. The possibilities and limitations of halloysite-based nanocomposites for future applications are also discussed and new fields of research are proposed. It is suggested that Halloysite-based nanocomposites are more promising in positively charged organic substrates like tetracycline and Rhodamine B where the organic pollutant is attracted by halloysite's negatively charged external surfaces close to the photocatalysts, than neutral like paracetamol or negatively charged which that attraction does not occur.

ACS Style

D. Papoulis. Halloysite based nanocomposites and photocatalysis: A Review. Applied Clay Science 2018, 168, 164 -174.

AMA Style

D. Papoulis. Halloysite based nanocomposites and photocatalysis: A Review. Applied Clay Science. 2018; 168 ():164-174.

Chicago/Turabian Style

D. Papoulis. 2018. "Halloysite based nanocomposites and photocatalysis: A Review." Applied Clay Science 168, no. : 164-174.

Journal article
Published: 01 October 2018 in Materials Science in Semiconductor Processing
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Two different nanoclay minerals were combined with nanophase anatase TiO2 for the synthesis of clay-based nanocomposites for improved photocatalytic properties. A new Halloysite (Hal) + Sepiolite (S) - TiO2 ternary nanocomposite was prepared using halloysite from Utah, USA and a recently discovered sepiolite from Greece. Three nanocomposites were synthesized with Hal-TiO2, S-TiO2 and [Hal+S] to TiO2. As a result, TiO2 particles (anatase) were homogeneously deposited and dispersed on the clay surfaces. Phase composition, particle morphology and physical properties of these nanocomposites were characterized by XRD, ATR-FTIR, FE-SEM, DRS-UV–Vis and N2-sorption/desorption isotherms at 77 K. The photocatalytic activity of the clay mineral-TiO2 nanocomposites was examined in the decomposition of paracetamol and tetracycline antibiotics as well as dye Rhodamine-B. The nanocomposites exhibited higher photocatalytic activity under UV irradiation for the decomposition of the targeted pollutants than the benchmark in the field, i.e. TiO2- P25 photocatalyst.

ACS Style

D. Papoulis; D. Panagiotaras; P. Tsigrou; K.C. Christoforidis; C. Petit; A. Apostolopoulou; E. Stathatos; S. Komarneni; I. Koukouvelas. Halloysite and sepiolite –TiO2 nanocomposites: Synthesis characterization and photocatalytic activity in three aquatic wastes. Materials Science in Semiconductor Processing 2018, 85, 1 -8.

AMA Style

D. Papoulis, D. Panagiotaras, P. Tsigrou, K.C. Christoforidis, C. Petit, A. Apostolopoulou, E. Stathatos, S. Komarneni, I. Koukouvelas. Halloysite and sepiolite –TiO2 nanocomposites: Synthesis characterization and photocatalytic activity in three aquatic wastes. Materials Science in Semiconductor Processing. 2018; 85 ():1-8.

Chicago/Turabian Style

D. Papoulis; D. Panagiotaras; P. Tsigrou; K.C. Christoforidis; C. Petit; A. Apostolopoulou; E. Stathatos; S. Komarneni; I. Koukouvelas. 2018. "Halloysite and sepiolite –TiO2 nanocomposites: Synthesis characterization and photocatalytic activity in three aquatic wastes." Materials Science in Semiconductor Processing 85, no. : 1-8.

Journal article
Published: 31 July 2018 in Minerals
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This paper investigates the effect of alteration on the physicomechanical properties of igneous rocks used as aggregates, from various areas from Greece. The studied lithologies include serpentinized dunites, serpentinized harzburgites, serpentinized lherzolites, metamorphic gabbros, diabases, dacites and andesites. Quantitative petrographic analysis shows that the tested samples display various percentages of secondary phyllosilicate minerals. Mineral quantification of the studied rock samples was performed by using the Rietveld method on X-ray diffraction patterns. The samples were also tested to assign moisture content (w (%)), total porosity (nt (%)), uniaxial compressive strength (UCS (MPa)) and Los Angeles abrasion test (LA (%)). The influence of secondary phyllosilicate minerals on the physicomechanical behavior of the tested samples was determined using regression analysis and their derived equations. Regression analysis shows a positive relationship between the percentage of the phyllosilicate minerals of the rocks and the moisture content as well as with the total porosity values. In mafic and ultramafic rock samples, the relationships between the secondary phyllosilicate minerals and their physicomechanical properties have shown that the total amount of the secondary phyllosilicate minerals results negatively on their physicomechanical properties. On the other hand, the low percentage of phyllosilicate minerals in volcanic rocks can’t be able to define their engineering properties.

ACS Style

Petros Petrounias; Panagiota P. Giannakopoulou; Aikaterini Rogkala; Paraskevi Lampropoulou; Eleni Koutsopoulou; Dimitrios Papoulis; Basilios Tsikouras; Konstantin Hatzipanagiotou. The Impact of Secondary Phyllosilicate Minerals on the Engineering Properties of Various Igneous Aggregates from Greece. Minerals 2018, 8, 329 .

AMA Style

Petros Petrounias, Panagiota P. Giannakopoulou, Aikaterini Rogkala, Paraskevi Lampropoulou, Eleni Koutsopoulou, Dimitrios Papoulis, Basilios Tsikouras, Konstantin Hatzipanagiotou. The Impact of Secondary Phyllosilicate Minerals on the Engineering Properties of Various Igneous Aggregates from Greece. Minerals. 2018; 8 (8):329.

Chicago/Turabian Style

Petros Petrounias; Panagiota P. Giannakopoulou; Aikaterini Rogkala; Paraskevi Lampropoulou; Eleni Koutsopoulou; Dimitrios Papoulis; Basilios Tsikouras; Konstantin Hatzipanagiotou. 2018. "The Impact of Secondary Phyllosilicate Minerals on the Engineering Properties of Various Igneous Aggregates from Greece." Minerals 8, no. 8: 329.

Journal article
Published: 23 July 2018 in Scientific Reports
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Many hirundine species construct their nests by carrying mud particles from adjacent areas. This study aimed to investigate for the first time the materials that mud-nesting hirundines choose for nest construction from a mineralogical and sedimentological perspective. For this purpose, we sampled nests of three sympatric species, namely the Barn Swallow (Hirundo rustica), the Red-rumped Swallow (Cecropis daurica) and the House Martin (Delichon urbicum), from southeastern Europe. Our results showed that all species tend to use clay minerals as a cement and especially smectite and illite and if these minerals are not present in the adjacent area, they use halloysite, kaolinite or chlorite. The amounts of clay minerals in the nests are generally low indicating that the studied species can accurately identify the properties of the nesting materials. Most of the non clay minerals that they use are the common, easily accessible colourless or white minerals with low specific gravity values such as quartz, feldspars and calcite. Grain size distribution analysis revealed that the amount of clay sized grains in the mud nests of all three species is relatively low, while the amount of larger grain particles decreases when the size of the non clay minerals is small. The Red-rumped Swallow showed an increasing preference for larger grain size particles and quartz, the Barn Swallow for finer grain size particles and calcite, and the preferences of the House Martin are in between the other two species. The three hirundine species present different nest building strategies and depending on the nest architecture, each of them seems to show preference for specific minerals and specific grain sizes.

ACS Style

Dimitrios Papoulis; Olga Tzortzakaki; Pavlos Avramidis; Panagiotis Mentis; Paraskevi Lampropoulou; George Iliopoulos. Mineralogical and textural characteristics of nest building geomaterials used by three sympatric mud-nesting hirundine species. Scientific Reports 2018, 8, 11050 .

AMA Style

Dimitrios Papoulis, Olga Tzortzakaki, Pavlos Avramidis, Panagiotis Mentis, Paraskevi Lampropoulou, George Iliopoulos. Mineralogical and textural characteristics of nest building geomaterials used by three sympatric mud-nesting hirundine species. Scientific Reports. 2018; 8 (1):11050.

Chicago/Turabian Style

Dimitrios Papoulis; Olga Tzortzakaki; Pavlos Avramidis; Panagiotis Mentis; Paraskevi Lampropoulou; George Iliopoulos. 2018. "Mineralogical and textural characteristics of nest building geomaterials used by three sympatric mud-nesting hirundine species." Scientific Reports 8, no. 1: 11050.

Preprint
Published: 22 June 2018
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This paper investigates the effect of alteration on the physicomechanical properties of igneous rocks from various areas from Greece used as aggregates. The studied lithologies include dunites, harzburgites, lherzolites, gabbros, diabases, dacites and andesites. Quantitative petrographic analysis shows that the tested samples display various percentages of secondary phyllosilicate minerals. Mineral quantification of studied rock samples was performed by using a Rietveld method on X-Ray diffraction patterns of the studied aggregates. The aggregates are also tested to assign moisture content [w (%)], total porosity [nt (%)], uniaxial compressive strength [UCS (MPa)] and Los Angeles abrasion test [LA (%)]. The influence of secondary phyllosilicate minerals on physicomechanical behavior of tested samples determined using regression analysis and their derived equations. Regression analysis shows positive relationship between the percentage of phyllosilicate minerals of rocks and moisture content as well as with the total porosity values. The relationships between phyllosilicate minerals in the ultramafic and mafic samples and their mechanical properties show that the total rates of phyllosilicate mineral products result negatively in their mechanical properties, while the low percentage of phyllosilicate minerals in volcanic rocks are not able to define set of their engineering parameters.

ACS Style

Petros Petrounias; Panagiota P. Giannakopoulou; Aikaterini Rogkala; Paraskevi Lampropoulou; Eleni Koutsopoulou; Dimitrios Papoulis; Basilios Tsikouras; Konstantin Hatzipanagiotou. The Impact of Secondary Phyllosilicate Minerals on the Engineering Properties of Various Igneous Aggregates from Greece. 2018, 1 .

AMA Style

Petros Petrounias, Panagiota P. Giannakopoulou, Aikaterini Rogkala, Paraskevi Lampropoulou, Eleni Koutsopoulou, Dimitrios Papoulis, Basilios Tsikouras, Konstantin Hatzipanagiotou. The Impact of Secondary Phyllosilicate Minerals on the Engineering Properties of Various Igneous Aggregates from Greece. . 2018; ():1.

Chicago/Turabian Style

Petros Petrounias; Panagiota P. Giannakopoulou; Aikaterini Rogkala; Paraskevi Lampropoulou; Eleni Koutsopoulou; Dimitrios Papoulis; Basilios Tsikouras; Konstantin Hatzipanagiotou. 2018. "The Impact of Secondary Phyllosilicate Minerals on the Engineering Properties of Various Igneous Aggregates from Greece." , no. : 1.

Journal article
Published: 31 March 2018 in Geosciences
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This study aims at the interpretation of the adverse effects of the secondary products in two types of rocks during their performance as concrete aggregates. Serpentinised peridotites contain serpentine, as the dominant secondary phase, which creates low microroughness on the particles and therefore unfavorable surfaces for cement paste to adequately adhere to. Moreover, its soft and platy nature contributes to the development of platy defects along the contacts of the aggregate particles with the cement paste. Poor adherence of the paste, failures along the contacts of the aggregate particles and potential propagation of the defects into the concrete during curing (and perhaps subsequently in-service) explain the poor performance of highly serpentinised rocks as concrete aggregates. Andesites show a different composition with a variety of secondary products including albite, chlorite, calcite, Fe-oxides and clay minerals. The role of all these products was investigated and it appears that only smectite is important, as even small amounts of it may be detrimental to the quality of the rocks as concrete aggregates. It is likely that abnormal hydration reactions and considerable swelling of the smectite result in the appearance of defects in the concrete, hence contributing to its low performance.

ACS Style

Petros Petrounias; Panagiota P. Giannakopoulou; Aikaterini Rogkala; Panagiotis M. Stamatis; Basilios Tsikouras; Dimitrios Papoulis; Paraskevi Lampropoulou; Konstantin Hatzipanagiotou. The Influence of Alteration of Aggregates on the Quality of the Concrete: A Case Study from Serpentinites and Andesites from Central Macedonia (North Greece). Geosciences 2018, 8, 115 .

AMA Style

Petros Petrounias, Panagiota P. Giannakopoulou, Aikaterini Rogkala, Panagiotis M. Stamatis, Basilios Tsikouras, Dimitrios Papoulis, Paraskevi Lampropoulou, Konstantin Hatzipanagiotou. The Influence of Alteration of Aggregates on the Quality of the Concrete: A Case Study from Serpentinites and Andesites from Central Macedonia (North Greece). Geosciences. 2018; 8 (4):115.

Chicago/Turabian Style

Petros Petrounias; Panagiota P. Giannakopoulou; Aikaterini Rogkala; Panagiotis M. Stamatis; Basilios Tsikouras; Dimitrios Papoulis; Paraskevi Lampropoulou; Konstantin Hatzipanagiotou. 2018. "The Influence of Alteration of Aggregates on the Quality of the Concrete: A Case Study from Serpentinites and Andesites from Central Macedonia (North Greece)." Geosciences 8, no. 4: 115.

Journal article
Published: 12 March 2018 in Geosciences
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This study presents the combined use of field mapping, remote sensing data analysis, mineralogy, spectroscopy and GIS techniques for the geological mapping of Antiparos Island. Antiparos is part of the Cyclades Blueschist Belt located in central Aegean, where gneisses, schists and Pliocene volcanic rocks occurred. During the extended field work, a number of volcanic rock samples were collected from the southern part of Antiparos. The sampling strategy was to collect samples from the primary as well as the altered rocks in specific areas in which they were previously located from the remote sensing data processing. In this study, high resolution satellite images have been carried out in order to detect, allocate and separate the different geological formations. Furthermore, the existing geological map was georeferenced and all the tectonic lines and boundaries were digitized. All these features were implemented in a Mobile Mapper CE GPS using Arcpad GIS and checked in situ. The collected samples were analyzed in the laboratory using various techniques including XRD, Petrographic Microscopy and SEM. The qualitative mineralogical analyses were conducted by using XRD. The study was supplemented by the petrographic observations providing a detailed characterization of rock textures. In addition, SEM study and SEM-EDS analyses of the samples were emphasized on the genetic relations of the minerals. The laboratory results revealed that specific corrections should be made in the previous geological map of Antiparos concerning the volcanic rocks, especially at the southern part of the island. A significant conclusion is that the rock described as volcanic in the previous map proved to be a fossiliferous limestone which includes micritic matrix of calcite with an insignificant amount of fossils. All the analogical and digital data and the results of the petrographic analysis were imported in a geodatabase specially designed for geological data. After the necessary topological control and corrections, the data were unified and processed in order to create the final layout at 1/25.000 scale.

ACS Style

Konstantinos G. Nikolakopoulos; Paraskevi Lampropoulou; Dimitrios Papoulis; Aikaterini Rogkala; Panagiota P. Giannakopoulou; Petros Petrounias. Combined Use of Remote Sensing Data, Mineralogical Analyses, Microstructure Studies and Geographic Information System for Geological Mapping of Antiparos Island (Greece). Geosciences 2018, 8, 96 .

AMA Style

Konstantinos G. Nikolakopoulos, Paraskevi Lampropoulou, Dimitrios Papoulis, Aikaterini Rogkala, Panagiota P. Giannakopoulou, Petros Petrounias. Combined Use of Remote Sensing Data, Mineralogical Analyses, Microstructure Studies and Geographic Information System for Geological Mapping of Antiparos Island (Greece). Geosciences. 2018; 8 (3):96.

Chicago/Turabian Style

Konstantinos G. Nikolakopoulos; Paraskevi Lampropoulou; Dimitrios Papoulis; Aikaterini Rogkala; Panagiota P. Giannakopoulou; Petros Petrounias. 2018. "Combined Use of Remote Sensing Data, Mineralogical Analyses, Microstructure Studies and Geographic Information System for Geological Mapping of Antiparos Island (Greece)." Geosciences 8, no. 3: 96.

Journal article
Published: 01 January 2018 in Desalination and Water Treatment
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Vlasoula Bekiari; E. Stathatos; D. Papoulis; G. Panagopoulos; A.N. Kalarakis; I. Iliopoulos; E. Kourkouta; P. Mavrokota. Use of halloysite–TiO2 nanocomposites for the decomposition of tebuconazole fungicide in water. Desalination and Water Treatment 2018, 127, 132 -139.

AMA Style

Vlasoula Bekiari, E. Stathatos, D. Papoulis, G. Panagopoulos, A.N. Kalarakis, I. Iliopoulos, E. Kourkouta, P. Mavrokota. Use of halloysite–TiO2 nanocomposites for the decomposition of tebuconazole fungicide in water. Desalination and Water Treatment. 2018; 127 ():132-139.

Chicago/Turabian Style

Vlasoula Bekiari; E. Stathatos; D. Papoulis; G. Panagopoulos; A.N. Kalarakis; I. Iliopoulos; E. Kourkouta; P. Mavrokota. 2018. "Use of halloysite–TiO2 nanocomposites for the decomposition of tebuconazole fungicide in water." Desalination and Water Treatment 127, no. : 132-139.

Journal article
Published: 31 July 2017 in Bulletin of the Geological Society of Greece
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Sanitary landfill facilities are essential to modern societies as repositories for municipal solid wastes. However, they always entrain a certain risk of environmental impact. For this reason monitoring is essential to their operation. In the present work, the environmental impact of such a landfill is studied. Soil samples were collected in and around the landfill and their mineralogy was studied. Top layers of stream sediments were collected to examine possible dispersion of pollutants in the environment. Chemical analyses showed enrichment in As, Cu, Zn, and Pb in the stream sediments compared to uncontaminated samples. The presence of anions such as chloride, sulphate and phosphate adsorbed on clay minerals suggest the interaction of stream sediments with run-off water from the landfill. The groundwater near the landfill site was characterised as not potable and not suitable for irrigation purposes, because some parameters such as NO3 - and Cl- were close or exceeded the permissible limits given by EE, EPA and WHO.

ACS Style

E. Koutsopoulou; P. Tsolis-Katagas; D. Papoulis. HEAVY METALS IN STREAM SEDIMENTS AFFECTED BY A LANDFILL AND ASSOCIATED IMPACT ON GROUNDWATER QUALITY. Bulletin of the Geological Society of Greece 2017, 43, 2635 -2645.

AMA Style

E. Koutsopoulou, P. Tsolis-Katagas, D. Papoulis. HEAVY METALS IN STREAM SEDIMENTS AFFECTED BY A LANDFILL AND ASSOCIATED IMPACT ON GROUNDWATER QUALITY. Bulletin of the Geological Society of Greece. 2017; 43 (5):2635-2645.

Chicago/Turabian Style

E. Koutsopoulou; P. Tsolis-Katagas; D. Papoulis. 2017. "HEAVY METALS IN STREAM SEDIMENTS AFFECTED BY A LANDFILL AND ASSOCIATED IMPACT ON GROUNDWATER QUALITY." Bulletin of the Geological Society of Greece 43, no. 5: 2635-2645.

Journal article
Published: 28 July 2017 in Bulletin of the Geological Society of Greece
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Metamorphic and igneous rocks of Terpnis' Serres in N. Greece have been studied. Nowadays these metamorphic rocks are used as raw materials in stone wool production, by Fibran industry, whilst the studied plutonic samples with lower content of iron oxide are proposed as alternative raw material for the production of new lightly colored stone wool, according to the market demands. Selected epidote amphibolites and quartz diorite samples were analyzed by ICP ΟES, AAS, XRD, Petrographic microscopy, and SEM. The epidote-amphibolites show some evidence of weathering leading to sericiticsaussuritizated plagioclase crystals and secondary smectite and chlorite nanocrystals. Phyllosilicates affect positively the grinding procedure and melting of the raw materials under industrial conditions of stone wool production, due to its lower hardness and melting point compared to that of the primary hornblende. The chemical and major mineralogical composition, the heterogeneous characteristics of textures as well as the frequent presence of phyllosilicates, due to the weathering of the plutonic studied samples, are expected to contribute to the easier grinding and melting of rocks under industrial conditions as well as to the production of a new light colored and competitive stone wool product

ACS Style

P. Lampropoulou; D. Papoulis; E. Metaxa; B. Tsikouras; K. Hatzipanagioutou; Th. Tzevelekou; A. Karageorgis. ASSESMENT OF THE QUALITY OF METAMORPHIC AND IGNEOUS ROCKS FROM TERPNI (SERRES, NORTH GREECE) FOR THEIR USE AS RAW MATERIALS IN THE PRODUCTION OF STONEWOOL. Bulletin of the Geological Society of Greece 2017, 50, 1913 -1922.

AMA Style

P. Lampropoulou, D. Papoulis, E. Metaxa, B. Tsikouras, K. Hatzipanagioutou, Th. Tzevelekou, A. Karageorgis. ASSESMENT OF THE QUALITY OF METAMORPHIC AND IGNEOUS ROCKS FROM TERPNI (SERRES, NORTH GREECE) FOR THEIR USE AS RAW MATERIALS IN THE PRODUCTION OF STONEWOOL. Bulletin of the Geological Society of Greece. 2017; 50 (4):1913-1922.

Chicago/Turabian Style

P. Lampropoulou; D. Papoulis; E. Metaxa; B. Tsikouras; K. Hatzipanagioutou; Th. Tzevelekou; A. Karageorgis. 2017. "ASSESMENT OF THE QUALITY OF METAMORPHIC AND IGNEOUS ROCKS FROM TERPNI (SERRES, NORTH GREECE) FOR THEIR USE AS RAW MATERIALS IN THE PRODUCTION OF STONEWOOL." Bulletin of the Geological Society of Greece 50, no. 4: 1913-1922.

Journal article
Published: 24 January 2017 in Bulletin of the Geological Society of Greece
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Therefore, the evaluation of environmental risks associated with a landfill and the effect of landfill surface runoff was investigated. Soil samples were collected in the downstream area of the waste disposal site and their mineralogy was studied. An appraisal of the heavy metal contamination in the area was attempted. Top layers of sediments seem to interact with chemically modified surface runoff waters from the landfill. Heavy metals such as As and Pb were in significant concentrations in the sediments within a distance of 200 m from the site. Anions such as chloride, sulphate and phosphate adsorbed on clay minerals suggest the interaction of sediments with surface runoff from the waste disposal site. Inorganic parameters NH4 + and NO2 - in surface water samples are above or slightly below the guidelines recommended by EE and WHO. The results indicated that environmental monitoring of the landfill is considered essential.

ACS Style

E. Koutsopoulou; K. Katsanou; D. Papoulis; E. Zagana; P. Tsolis- Katagas. Environmental assessment of contaminants in a downstream area of a landfill. Bulletin of the Geological Society of Greece 2017, 47, 972 .

AMA Style

E. Koutsopoulou, K. Katsanou, D. Papoulis, E. Zagana, P. Tsolis- Katagas. Environmental assessment of contaminants in a downstream area of a landfill. Bulletin of the Geological Society of Greece. 2017; 47 (2):972.

Chicago/Turabian Style

E. Koutsopoulou; K. Katsanou; D. Papoulis; E. Zagana; P. Tsolis- Katagas. 2017. "Environmental assessment of contaminants in a downstream area of a landfill." Bulletin of the Geological Society of Greece 47, no. 2: 972.

Journal article
Published: 24 January 2017 in Bulletin of the Geological Society of Greece
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Clay minerals in shallow fault rocks are increasingly recognized as key to the mechanical and seismogenic behavior of faults and fluid flow circulation within the fault core and the surrounding damage zone. We therefore studied faultgouge mineralogy from samples derived from the ENE-trending Arkitsa fault zone, in east-central Greece, in order to testify if the fault is acting as a channel for fluid flow and whether the conditions that characterize the flow can be identified. Clay-gouge samples were collected within the fault core zone, as well as in the broader fault damage area. Consequently, the samples were analyzed by X-Ray Diffraction, SEM and Electron microprobe analyses. The minerals that were identified within the centre of the fault zone are: Montmorillonite, corrensite, illite, micro-calcite, dolomite, quartz, plagioclase and K-feldspars. The absence of corrensite, a clay mineral usually formed in hydrothermal conditions, in the samples from the broader fault damage area indicates that the circulation of hydrothermal fluids is mostly confined within and around the fault core zone. The assemblages within the fault gouge zone and especially the presence of corrensite, combined with the absence of laumontite, indicate hydrothermal alteration at neutral to alkaline conditions and a temperature range at about 100-150 oC.

ACS Style

D. Papoulis; D. Romiou; S. Kokkalas; P. Lampropoulou. Clay minerals from the Arkitsa fault gouge zone, in Central Greece, and implications for fluid flow. Bulletin of the Geological Society of Greece 2017, 47, 616 .

AMA Style

D. Papoulis, D. Romiou, S. Kokkalas, P. Lampropoulou. Clay minerals from the Arkitsa fault gouge zone, in Central Greece, and implications for fluid flow. Bulletin of the Geological Society of Greece. 2017; 47 (2):616.

Chicago/Turabian Style

D. Papoulis; D. Romiou; S. Kokkalas; P. Lampropoulou. 2017. "Clay minerals from the Arkitsa fault gouge zone, in Central Greece, and implications for fluid flow." Bulletin of the Geological Society of Greece 47, no. 2: 616.

Journal article
Published: 23 January 2017 in Bulletin of the Geological Society of Greece
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The Agios Georgios cave at Kilkis (North Greece) contains a large variety of speleothems and it is considered as one of the most decorated caves of Greece. For this study a coordinated geochemical and textural investigation of the speleothem was carried out. This stalactite was cut along its growth axis and a transverse slab of it shows parallel calcite layers of varying thickness and colour, whose regularity and spacing suggest an annual origin. Microscopic investigation of polished-thin sections resulted in a detailed description of several fabric types. Scanning Electron Microscopic study and microanalyses revealed that pure calcite is dominant; local Mg-bearing calcite occurs, too. In some pores among the faceted crystals there is a variety of clay minerals that, along with the development of Mg-bearing calcite, are interpreted as the result of microbiological or/and climatic changes. Numerous changes in environmental conditions in caves (particularly changes in water flow rates) cause variations in the degree of perfection of crystallite lateral growth and inclusions may trapped by their advancing growth surface. The speleothem is studied in order to generate archives of climate change (aridity, flow rates etc.) and indentifying shifts in climate system. The successive laminae in the studied speleothem from Agios Georgios suggest alternative cool and warm periods in the past climatic conditions of northern Greece.

ACS Style

A. Antonelou; B. Tsikouras; D. Papoulis; K. Hatzipanagiotou. INVESTIGATION OF THE FORMATION OF SPELEOTHEMS IN THE AGIOS GEORGIOS CAVE, KILKIS (N. GREECE). Bulletin of the Geological Society of Greece 2017, 43, 876 .

AMA Style

A. Antonelou, B. Tsikouras, D. Papoulis, K. Hatzipanagiotou. INVESTIGATION OF THE FORMATION OF SPELEOTHEMS IN THE AGIOS GEORGIOS CAVE, KILKIS (N. GREECE). Bulletin of the Geological Society of Greece. 2017; 43 (2):876.

Chicago/Turabian Style

A. Antonelou; B. Tsikouras; D. Papoulis; K. Hatzipanagiotou. 2017. "INVESTIGATION OF THE FORMATION OF SPELEOTHEMS IN THE AGIOS GEORGIOS CAVE, KILKIS (N. GREECE)." Bulletin of the Geological Society of Greece 43, no. 2: 876.