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In this work, lanthanum and manganese co-substitution effects on different properties of bismuth ferrite solid solutions Bi1-xLaxFe0.85Mn0.15O3 (x from 0 to 1) prepared by a sol-gel synthetic approach have been investigated. It was observed that the structural, morphological, and magnetic properties of obtained specimens are influenced by the amount of introduced La3+ ions. Surprisingly, only the compound with a composition of BiFe0.85Mn0.15O3 was not monophasic, and the presence of neighboring phases was determined from X-ray diffraction analysis and Mössbauer measurements. Structural transitions from orthorhombic to cubic and back to orthorhombic were also observed depending on the La3+ amount. Antiferromagnetic behaviour was observed for all of the samples, with the highest magnetisation values for Bi0.5La0.5Fe0.85Mn0.15O3. Additionally, structural attributes and morphological features were evaluated by Raman spectroscopy and scanning electron microscopy (SEM), respectively.
Dovydas Karoblis; Ramunas Diliautas; Kestutis Mazeika; Dalis Baltrunas; Gediminas Niaura; Martynas Talaikis; Aldona Beganskiene; Aleksej Zarkov; Aivaras Kareiva. Lanthanum and Manganese Co-Doping Effects on Structural, Morphological, and Magnetic Properties of Sol-Gel Derived BiFeO3. Materials 2021, 14, 4844 .
AMA StyleDovydas Karoblis, Ramunas Diliautas, Kestutis Mazeika, Dalis Baltrunas, Gediminas Niaura, Martynas Talaikis, Aldona Beganskiene, Aleksej Zarkov, Aivaras Kareiva. Lanthanum and Manganese Co-Doping Effects on Structural, Morphological, and Magnetic Properties of Sol-Gel Derived BiFeO3. Materials. 2021; 14 (17):4844.
Chicago/Turabian StyleDovydas Karoblis; Ramunas Diliautas; Kestutis Mazeika; Dalis Baltrunas; Gediminas Niaura; Martynas Talaikis; Aldona Beganskiene; Aleksej Zarkov; Aivaras Kareiva. 2021. "Lanthanum and Manganese Co-Doping Effects on Structural, Morphological, and Magnetic Properties of Sol-Gel Derived BiFeO3." Materials 14, no. 17: 4844.
Functional inorganic materials are an indispensable part of innovative technologies, which are essential to the development of many fields of industry
Aleksej Zarkov; Aivaras Kareiva; Loreta Tamasauskaite-Tamasiunaite. Advances in Functional Inorganic Materials Prepared by Wet Chemical Methods. Crystals 2021, 11, 943 .
AMA StyleAleksej Zarkov, Aivaras Kareiva, Loreta Tamasauskaite-Tamasiunaite. Advances in Functional Inorganic Materials Prepared by Wet Chemical Methods. Crystals. 2021; 11 (8):943.
Chicago/Turabian StyleAleksej Zarkov; Aivaras Kareiva; Loreta Tamasauskaite-Tamasiunaite. 2021. "Advances in Functional Inorganic Materials Prepared by Wet Chemical Methods." Crystals 11, no. 8: 943.
The current work focuses on the development of a novel electrospun silk fibroin (SF) nonwoven mat as a GTR membrane with antibacterial, biomineralization and biocompatible properties. The γ-poly glutamic acid (γ-PGA)-capped nano silver fluoride (NSF) and silver diamine fluoride (SDF) were first synthesized, which were dip-coated onto electrospun silk fibroin mats (NSF-SF and SDF-SF). UV-Vis spectroscopy and TEM depicted the formation of silver nanoparticles. NSF-SF and SDF-SF demonstrated antibacterial properties (against Porphyromonas gingivalis) with 3.1 and 6.7 folds higher relative to SF, respectively. Post-mineralization in simulated body fluid, the NSF-SF effectively promoted apatite precipitation (Ca/P ~1.67), while the SDF-SF depicted deposition of silver nanoparticles, assessed by SEM-EDS. According to the FTIR-ATR deconvolution analysis, NSF-SF portrayed ~75% estimated hydroxyapatite crystallinity index (CI), whereas pure SF and SDF-SF demonstrated ~60%. The biocompatibility of NSF-SF was ~82% when compared to the control, while SDF-coated samples revealed in vitro cytotoxicity, further needing in vivo studies for a definite conclusion. Furthermore, the NSF-SF revealed the highest tensile strength of 0.32 N/mm and 1.76% elongation at break. Therefore, it is substantiated that the novel bioactive and antibacterial NSF-SF membranes can serve as a potential candidate, shedding light on further in-depth analysis for GTR applications.
Aditi Pandey; Tzu-Sen Yang; Ta-I Yang; Wendimi Fatimata Belem; Nai-Chia Teng; I-Wen Chen; Ching-Shuan Huang; Aivaras Kareiva; Jen-Chang Yang. An Insight into Nano Silver Fluoride-Coated Silk Fibroin Bioinspired Membrane Properties for Guided Tissue Regeneration. Polymers 2021, 13, 2659 .
AMA StyleAditi Pandey, Tzu-Sen Yang, Ta-I Yang, Wendimi Fatimata Belem, Nai-Chia Teng, I-Wen Chen, Ching-Shuan Huang, Aivaras Kareiva, Jen-Chang Yang. An Insight into Nano Silver Fluoride-Coated Silk Fibroin Bioinspired Membrane Properties for Guided Tissue Regeneration. Polymers. 2021; 13 (16):2659.
Chicago/Turabian StyleAditi Pandey; Tzu-Sen Yang; Ta-I Yang; Wendimi Fatimata Belem; Nai-Chia Teng; I-Wen Chen; Ching-Shuan Huang; Aivaras Kareiva; Jen-Chang Yang. 2021. "An Insight into Nano Silver Fluoride-Coated Silk Fibroin Bioinspired Membrane Properties for Guided Tissue Regeneration." Polymers 13, no. 16: 2659.
Mineral trioxide aggregate (MTA) is well known as an effective root canal filling material for endodontics therapy. Within MTA, bismuth oxide (Bi2O3) serving as the radiopacifier still has biocompatibility concerns due to its mild cytotoxicity. In the present study, we tried to modify the Bi2O3 radiopacifier by doping hafnium ions via the sol-gel process and investigated the effects of different doping ratios (Bi2-xHfxO3+x/2, x = 0–0.3) and calcination temperatures (400–800 °C). We mixed various precursor mixtures of bismuth nitrate (Bi(NO3)3·5H2O) and hafnium sulfate (Hf(SO4)2) and controlled the calcination temperatures. The as-prepared Hf-doped Bi2O3 radiopacifier powders were investigated by thermogravimetric analysis (TGA), X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM). Portland cement/radiopacifier/calcium sulfate (75/20/5) were mixed and set by deionized water (powder to water ratio = 3:1). Changes in radiopacity, diametral tensile strength (DTS), and in vitro cell viability of the hydrated MTA-like cement were carried out. The experimental results showed that the group containing radiopacifier from sol-gelled Bi/Hf (90/10) exhibited significantly higher radiopacity (6.36 ± 0.34 mmAl), DTS (2.54 ± 0.29 MPa), and cell viability (84.0±8.1%) (p< 0.05) when compared to that of Bi/Hf (100/0) powders. It is suggested that the formation of β-Bi7.78Hf0.22O12.11 phase with hafnium addition and calcining at 700 °C can prepare novel bismuth/hafnium composite powder that can be used as an alternative radiopacifier for root canal filling materials.
Tzu-Sen Yang; May-Show Chen; Cheng-Jyun Huang; Chin-Yi Chen; Agnese Brangule; Aleksej Zarkov; Aivaras Kareiva; Chung-Kwei Lin; Jen-Chang Yang. A Novel Sol-Gel Bi2-xHfxO3+x/2 Radiopacifier for Mineral Trioxide Aggregates (MTA) as Dental Filling Materials. Applied Sciences 2021, 11, 7292 .
AMA StyleTzu-Sen Yang, May-Show Chen, Cheng-Jyun Huang, Chin-Yi Chen, Agnese Brangule, Aleksej Zarkov, Aivaras Kareiva, Chung-Kwei Lin, Jen-Chang Yang. A Novel Sol-Gel Bi2-xHfxO3+x/2 Radiopacifier for Mineral Trioxide Aggregates (MTA) as Dental Filling Materials. Applied Sciences. 2021; 11 (16):7292.
Chicago/Turabian StyleTzu-Sen Yang; May-Show Chen; Cheng-Jyun Huang; Chin-Yi Chen; Agnese Brangule; Aleksej Zarkov; Aivaras Kareiva; Chung-Kwei Lin; Jen-Chang Yang. 2021. "A Novel Sol-Gel Bi2-xHfxO3+x/2 Radiopacifier for Mineral Trioxide Aggregates (MTA) as Dental Filling Materials." Applied Sciences 11, no. 16: 7292.
In the present work, beta-calcium pyrophosphate (β-Ca2P2O7) was investigated as a potential adsorbent for the removal of heavy metal ions from water. Single-phase β-Ca2P2O7 powders were synthesized by a simple, scalable and cost-effective wet precipitation method followed by annealing at 800 °C, which was employed for the conversion of as-precipitated brushite (CaHPO4∙2H2O) to β-Ca2P2O7. Physicochemical properties of the sorbent were characterized by means of X-ray diffraction (XRD) analysis, Fourier transform infrared spectroscopy (FTIR), thermal analysis (TGA/DSC), scanning electron microscopy (SEM) and low temperature adsorption–desorption of nitrogen (BET method). The synthesized powders consisted of porous plate-like particles with micrometer dimensions. Specific surface area calculated by the BET method was found to be 7 m2 g−1. For the estimation of sorption properties, the aqueous model solutions containing different metal ions (Al3+, Cd2+, Co2+, Cu2+, Fe2+, Mn2+, Ni2+, Pb2+, Sn2+, Sr2+ and Zn2+) were used. The adsorption test revealed that β-Ca2P2O7 demonstrates the highest adsorption capacity for Pb2+ and Sn2+ ions, while the lowest capacity was observed towards Sr2+, Ni2+ and Co2+ ions. The optimal pH value for the removal of Pb2+ ions was determined to be 2, which is also related to the low solubility of β-Ca2P2O7 at this pH. The adsorption capacity towards Pb2+ ions was calculated as high as 120 mg g−1.
Diana Griesiute; Justina Gaidukevic; Aleksej Zarkov; Aivaras Kareiva. Synthesis of β-Ca2P2O7 as an Adsorbent for the Removal of Heavy Metals from Water. Sustainability 2021, 13, 7859 .
AMA StyleDiana Griesiute, Justina Gaidukevic, Aleksej Zarkov, Aivaras Kareiva. Synthesis of β-Ca2P2O7 as an Adsorbent for the Removal of Heavy Metals from Water. Sustainability. 2021; 13 (14):7859.
Chicago/Turabian StyleDiana Griesiute; Justina Gaidukevic; Aleksej Zarkov; Aivaras Kareiva. 2021. "Synthesis of β-Ca2P2O7 as an Adsorbent for the Removal of Heavy Metals from Water." Sustainability 13, no. 14: 7859.
This study aims to fabricate silk fibroin/calcium sulfate (SF/CS) composites by one-pot synthesis for bone regeneration applications. The SF was harvested from degummed silkworm cocoons, dissolved in a solvent system comprising of calcium chloride:ethanol:water (1:2:8), and then mixed with a stoichiometric amount of sodium sulfate to prepare various SF/CS composites. The crystal pattern, glass transition temperature, and chemical composition of SF/CS samples were analyzed by XRD, DSC, and FTIR, respectively. These characterizations revealed the successful synthesis of pure calcium sulfate dihydrate (CSD) and calcium sulfate hemihydrate (CSH) when it was combined with SF. The thermal analysis through DSC indicated molecular-level interaction between the SF and CS. The FTIR deconvolution spectra demonstrated an increment in the β-sheet content by increasing CS content in the composites. The investigation into the morphology of the composites using SEM revealed the formation of plate-like dihydrate in the pure CS sample, while rod-like structures of α-CSH surrounded by SF in the composites were observed. The compressive strength of the hydrated 10 and 20% SF-incorporated CSH composites portrayed more than a twofold enhancement (statistically significant) in comparison to that of the pure CS samples. Reduced compressive strength was observed upon further increasing the SF content, possibly due to SF agglomeration that restricted its uniform distribution. Therefore, the one-pot synthesized SF/CS composites demonstrated suitable chemical, thermal, and morphological properties. However, additional biological analysis of its potential use as bone substitutes is required.
Aditi Pandey; Tzu-Sen Yang; Shu-Lien Cheng; Ching-Shuan Huang; Agnese Brangule; Aivaras Kareiva; Jen-Chang Yang. A Novel One-Pot Synthesis and Characterization of Silk Fibroin/α-Calcium Sulfate Hemihydrate for Bone Regeneration. Polymers 2021, 13, 1996 .
AMA StyleAditi Pandey, Tzu-Sen Yang, Shu-Lien Cheng, Ching-Shuan Huang, Agnese Brangule, Aivaras Kareiva, Jen-Chang Yang. A Novel One-Pot Synthesis and Characterization of Silk Fibroin/α-Calcium Sulfate Hemihydrate for Bone Regeneration. Polymers. 2021; 13 (12):1996.
Chicago/Turabian StyleAditi Pandey; Tzu-Sen Yang; Shu-Lien Cheng; Ching-Shuan Huang; Agnese Brangule; Aivaras Kareiva; Jen-Chang Yang. 2021. "A Novel One-Pot Synthesis and Characterization of Silk Fibroin/α-Calcium Sulfate Hemihydrate for Bone Regeneration." Polymers 13, no. 12: 1996.
In the present work, Cr-substituted Mg3Al1−xCrx layered double hydroxides (LDHs) were synthesised through the phase conversion of sol-gel-derived mixed-metal oxides in an aqueous medium. The chromium substitution level in the range of 1 to 25 mol% was investigated. It was demonstrated that all synthesised specimens were single-phase LDHs. The results of elemental analysis confirmed that the suggested synthetic sol-gel chemistry approach is suitable for the preparation of LDHs with a highly controllable chemical composition. The surface microstructure of sol-gel-derived Mg3Al1−xCrx LDHs does not depend on the chromium substitution level. The formation of plate-like agglomerated particles, which consist of hexagonally shaped nanocrystallites varying in size from approximately 200 to 300 nm, was observed. Optical properties of the synthesised Mg3Al1−xCrx LDHs were investigated by means of photoluminescence. All Cr-containing powders exhibited characteristic emission in the red region of the visible spectrum. The strongest emission was observed for the sample doped with 5 mol% Cr3+ ions. However, the emission intensity of samples doped with 1–10 mol% Cr3+ ions was relatively similar. A further increase in the Cr3+ ion concentration to 25 mol% resulted in severe concentration quenching.
Ligita Valeikiene; Inga Grigoraviciute-Puroniene; Arturas Katelnikovas; Aleksej Zarkov; Aivaras Kareiva. Investigation of Structural and Luminescent Properties of Sol-Gel-Derived Cr‑Substituted Mg3Al1−xCrx Layered Double Hydroxides. Molecules 2021, 26, 1848 .
AMA StyleLigita Valeikiene, Inga Grigoraviciute-Puroniene, Arturas Katelnikovas, Aleksej Zarkov, Aivaras Kareiva. Investigation of Structural and Luminescent Properties of Sol-Gel-Derived Cr‑Substituted Mg3Al1−xCrx Layered Double Hydroxides. Molecules. 2021; 26 (7):1848.
Chicago/Turabian StyleLigita Valeikiene; Inga Grigoraviciute-Puroniene; Arturas Katelnikovas; Aleksej Zarkov; Aivaras Kareiva. 2021. "Investigation of Structural and Luminescent Properties of Sol-Gel-Derived Cr‑Substituted Mg3Al1−xCrx Layered Double Hydroxides." Molecules 26, no. 7: 1848.
In this study, an aqueous sol-gel synthesis method and subsequent dip-coating technique were applied for the preparation of yttrium iron garnet (YIG), yttrium iron perovskite (YIP), and terbium iron perovskite (TIP) bulk and thin films. The monophasic highly crystalline different iron ferrite powders have been synthesized using this simple aqueous sol-gel process displaying the suitability of the method. In the next step, the same sol-gel solution was used for the fabrication of coatings on monocrystalline silicon (100) using a dip-coating procedure. This resulted, likely due to substrate surface influence, in all coatings having mixed phases of both garnet and perovskite. Thermogravimetric (TG) analysis of the precursor gels was carried out. All the samples were investigated by X-ray powder diffraction (XRD) analysis. The coatings were also investigated by scanning electron microscopy (SEM), atomic force microscopy (AFM) and Mössbauer spectroscopy. Magnetic measurements were also carried out.
Justinas Januskevicius; Zivile Stankeviciute; Dalis Baltrunas; Kęstutis Mažeika; Aldona Beganskiene; Aivaras Kareiva. Aqueous Sol-Gel Synthesis of Different Iron Ferrites: From 3D to 2D. Materials 2021, 14, 1554 .
AMA StyleJustinas Januskevicius, Zivile Stankeviciute, Dalis Baltrunas, Kęstutis Mažeika, Aldona Beganskiene, Aivaras Kareiva. Aqueous Sol-Gel Synthesis of Different Iron Ferrites: From 3D to 2D. Materials. 2021; 14 (6):1554.
Chicago/Turabian StyleJustinas Januskevicius; Zivile Stankeviciute; Dalis Baltrunas; Kęstutis Mažeika; Aldona Beganskiene; Aivaras Kareiva. 2021. "Aqueous Sol-Gel Synthesis of Different Iron Ferrites: From 3D to 2D." Materials 14, no. 6: 1554.
In the present work, polycrystalline Bi0.67La0.33Fe0.5Sc0.5O3 thin films were synthesized using a simple and cost-effective chemical solution deposition process employing the spin coating technique. In order to check the feasibility of the fabrication of thin films on various types of substrates, the films were deposited on Pt-coated silicon, silicon, sapphire, corundum, fused silica and glass. Based on the results of thermogravimetric analysis of precursor and thermal stability study, it was determined that the optimal annealing temperature for the formation of perovskite structure is 600 °C. It was observed that the relative intensity of the pseudocubic peaks (001) p and (011) p in the XRD patterns is influenced by the nature of substrates, suggesting that the formed crystallites have some preferred orientation. Roughness of the films was determined to be dependent on the nature of the substrate.
Diana Griesiute; Dovydas Karoblis; Lina Mikoliunaite; Aleksej Zarkov; Andrei Salak; Aivaras Kareiva. Chemical Solution Deposition of La-Substituted BiFe0.5Sc0.5O3 Perovskite Thin Films on Different Substrates. Coatings 2021, 11, 307 .
AMA StyleDiana Griesiute, Dovydas Karoblis, Lina Mikoliunaite, Aleksej Zarkov, Andrei Salak, Aivaras Kareiva. Chemical Solution Deposition of La-Substituted BiFe0.5Sc0.5O3 Perovskite Thin Films on Different Substrates. Coatings. 2021; 11 (3):307.
Chicago/Turabian StyleDiana Griesiute; Dovydas Karoblis; Lina Mikoliunaite; Aleksej Zarkov; Andrei Salak; Aivaras Kareiva. 2021. "Chemical Solution Deposition of La-Substituted BiFe0.5Sc0.5O3 Perovskite Thin Films on Different Substrates." Coatings 11, no. 3: 307.
The data library collected investigating reconstructed red paints was successfully applied for the characterization for the first time of historical illuminated and rubricated manuscripts printed in the territory of the Grand Duchy of Lithuania. Two different red pigments (cinnabar and red lead) and three different binding media (fish glue, parchment glue, and gum Arabic) were identified in the manuscripts using SEM/EDX, FTIR, XRD and TG/DTG analysis methods. It is interesting to note, that according to the SEM/EDX results the red paints determined in the manuscripts were sufficiently pure without a large amount of impurities. The binding media in the original samples were easily identified using developed FTIR spectra of red paint with different binding media. The TG analysis showed that all TG curves of original samples were shifted toward the lower temperatures range. Finally, this work once again demonstrated the importance of using several analysis methods for the characterization of cultural heritage materials.
Aušra Čiuladienė; Aivaras Kareiva. Application of red paint data library for the characterization of the manuscript from Grand Duchy of Lithuania. Microchemical Journal 2021, 164, 105961 .
AMA StyleAušra Čiuladienė, Aivaras Kareiva. Application of red paint data library for the characterization of the manuscript from Grand Duchy of Lithuania. Microchemical Journal. 2021; 164 ():105961.
Chicago/Turabian StyleAušra Čiuladienė; Aivaras Kareiva. 2021. "Application of red paint data library for the characterization of the manuscript from Grand Duchy of Lithuania." Microchemical Journal 164, no. : 105961.
In this study, BiFe1-xMnxO3 (BiFeMnO; x from 0 to 0.5) solid solutions were prepared by low temperature sol-gel processing. It was demonstrated that structural, magnetic and morphological properties of BiFeMnO samples are dependent on the chemical composition of the synthesized BiFe1-xMnxO3 solid solutions. The thermal behaviour of the Bi–Fe–Mn–O precursor gels was investigated by thermogravimetric and differential scanning calorimetry (TG-DSC) measurements. From X-ray diffraction (XRD) analysis it was observed that monophasic BiFe1-xMnxO3 samples have formed up to 25 mol% of substitution. The Rietveld analysis showed that the structure of BiFeMnO specimens can be indexed by rhombohedral or orthorhombic unit cell depending on Mn3+ content. Scanning electron microscopy (SEM) was used to investigate samples morphology and revealed, that smaller particles form when Mn3+ is present inside the structure. Moreover, magnetic properties of solid solutions were also investigated, and antiferromagnetism and weak ferromagnetism were observed for the samples.
Ramunas Diliautas; Aldona Beganskiene; Dovydas Karoblis; Kestutis Mazeika; Dalis Baltrunas; Aleksej Zarkov; Rimantas Raudonis; Aivaras Kareiva. Reinspection of formation of BiFe1-xMnxO3 solid solutions via low temperature sol-gel synthesis route. Solid State Sciences 2020, 111, 106458 .
AMA StyleRamunas Diliautas, Aldona Beganskiene, Dovydas Karoblis, Kestutis Mazeika, Dalis Baltrunas, Aleksej Zarkov, Rimantas Raudonis, Aivaras Kareiva. Reinspection of formation of BiFe1-xMnxO3 solid solutions via low temperature sol-gel synthesis route. Solid State Sciences. 2020; 111 ():106458.
Chicago/Turabian StyleRamunas Diliautas; Aldona Beganskiene; Dovydas Karoblis; Kestutis Mazeika; Dalis Baltrunas; Aleksej Zarkov; Rimantas Raudonis; Aivaras Kareiva. 2020. "Reinspection of formation of BiFe1-xMnxO3 solid solutions via low temperature sol-gel synthesis route." Solid State Sciences 111, no. : 106458.
In this study, the aqueous sol-gel method was employed for the synthesis of (1−x)SrTiO3-xBiMnO3 solid solutions. Powder X-ray diffraction analysis confirmed the formation of single-phase perovskites with a cubic structure up to x = 0.3. A further increase of the BiMnO3 content led to the formation of a negligible amount of neighboring Mn3O4 impurity, along with the major perovskite phase. Infrared (FT-IR) analysis of the synthesized specimens showed gradual spectral change associated with the superposition effect of Mn-O and Ti-O bond lengths. By introducing BiMnO3 into the SrTiO3 crystal structure, the size of the grains increased drastically, which was confirmed by means of scanning electron microscopy. Magnetization studies revealed that all solid solutions containing the BiMnO3 component can be characterized as paramagnetic materials. It was observed that magnetization values clearly correlate with the chemical composition of powders, and the gradual increase of the BiMnO3 content resulted in noticeably higher magnetization values.
Dovydas Karoblis; Ramunas Diliautas; Eva Raudonyte-Svirbutaviciene; Kestutis Mazeika; Dalis Baltrunas; Aldona Beganskiene; Aleksej Zarkov; Aivaras Kareiva. The Synthesis and Characterization of Sol-Gel-Derived SrTiO3-BiMnO3 Solid Solutions. Crystals 2020, 10, 1125 .
AMA StyleDovydas Karoblis, Ramunas Diliautas, Eva Raudonyte-Svirbutaviciene, Kestutis Mazeika, Dalis Baltrunas, Aldona Beganskiene, Aleksej Zarkov, Aivaras Kareiva. The Synthesis and Characterization of Sol-Gel-Derived SrTiO3-BiMnO3 Solid Solutions. Crystals. 2020; 10 (12):1125.
Chicago/Turabian StyleDovydas Karoblis; Ramunas Diliautas; Eva Raudonyte-Svirbutaviciene; Kestutis Mazeika; Dalis Baltrunas; Aldona Beganskiene; Aleksej Zarkov; Aivaras Kareiva. 2020. "The Synthesis and Characterization of Sol-Gel-Derived SrTiO3-BiMnO3 Solid Solutions." Crystals 10, no. 12: 1125.
The aim of the work was to check how the introduction of alkali and cobalt ions into a manganese structure can affect the structural disorder and, in consequence, lead to the changes (improvements) of magnetic properties. The high-pressure sintering technique was applied to check if the external factor can modify the magnetization of manganites. Nanocrystalline La0.9A0.1Mn0.9Co0.1O3 (where A is Li, K, Na) powders were synthesized by the combustion technique. The respective powders were used for nanoceramics preparation by the high-pressure sintering technique. The structure and morphology of the compounds were studied by X-ray powder diffraction, scanning electron microscopy and energy-dispersive X-ray spectroscopy. Magnetization studies for all compounds were performed in order to check the changes induced by either codoping or the sintering pressure. It was found that the type of the dopant ion and sintering pressure produced significant changes to the magnetic properties of the studied compounds. Alkali ions lead to the stabilization of Co ions in the +2 oxidation state and the formation of positive exchange interactions Mn3+–Mn4+ and Co2+–Mn4+ and the subsequent increase in remanent magnetization. High sintering pressure leads to a decrease in grain size and reduction of long-range ferromagnetic order and lower magnetization.
Paweł Głuchowski; Ruslan Nikonkov; Robert Tomala; Wiesław Stręk; Tatsiana Shulha; Maria Serdechnova; Aleksej Zarkov; Tomas Murauskas; Andrius Pakalaniškis; Ramūnas Skaudžius; Aivaras Kareiva; Andrei Kholkin; Maxim Bushinsky; Sergei Latushka; Dmitry Karpinsky. Impact of Alkali Ions Codoping on Magnetic Properties of La0.9A0.1Mn0.9Co0.1O3 (A: Li, K, Na) Powders and Ceramics. Applied Sciences 2020, 10, 8786 .
AMA StylePaweł Głuchowski, Ruslan Nikonkov, Robert Tomala, Wiesław Stręk, Tatsiana Shulha, Maria Serdechnova, Aleksej Zarkov, Tomas Murauskas, Andrius Pakalaniškis, Ramūnas Skaudžius, Aivaras Kareiva, Andrei Kholkin, Maxim Bushinsky, Sergei Latushka, Dmitry Karpinsky. Impact of Alkali Ions Codoping on Magnetic Properties of La0.9A0.1Mn0.9Co0.1O3 (A: Li, K, Na) Powders and Ceramics. Applied Sciences. 2020; 10 (24):8786.
Chicago/Turabian StylePaweł Głuchowski; Ruslan Nikonkov; Robert Tomala; Wiesław Stręk; Tatsiana Shulha; Maria Serdechnova; Aleksej Zarkov; Tomas Murauskas; Andrius Pakalaniškis; Ramūnas Skaudžius; Aivaras Kareiva; Andrei Kholkin; Maxim Bushinsky; Sergei Latushka; Dmitry Karpinsky. 2020. "Impact of Alkali Ions Codoping on Magnetic Properties of La0.9A0.1Mn0.9Co0.1O3 (A: Li, K, Na) Powders and Ceramics." Applied Sciences 10, no. 24: 8786.
In this study, yttrium aluminium garnet (YAG) specimens in which yttrium was partially substituted by lanthanum Y3-xLaxAl5O12 (YLaAG) were prepared by an aqueous sol-gel method. YLaAG samples were analyzed by X-ray diffraction (XRD), solid state nuclear magnetic resonance (NMR) and electron paramagnetic resonance (EPR) methods. The presence of Ce3+ ions as an impurity originating from starting material was determined, therefore, luminescence measurements of YLaAG samples were also recorded. It was demonstrated that luminescent properties are strongly dependent on the phase composition of synthesized species. The XRD analysis results showed that only low substitution of yttrium by lanthanum is possible in Y3-xLaxAl5O12 without destroying garnet crystal structure. It was also demonstrated, that solid state NMR and EPR methods are indispensable tools for the explanation of processes and properties observed in the newly synthesized Y3-xLaxAl5O12 compounds.
A. Laurikenas; D. Sakalauskas; A. Marsalka; R. Raudonis; A. Antuzevics; V. Balevicius; A. Zarkov; A. Kareiva. Investigation of lanthanum substitution effects in yttrium aluminium garnet: importance of solid state NMR and EPR methods. Journal of Sol-Gel Science and Technology 2020, 97, 479 -487.
AMA StyleA. Laurikenas, D. Sakalauskas, A. Marsalka, R. Raudonis, A. Antuzevics, V. Balevicius, A. Zarkov, A. Kareiva. Investigation of lanthanum substitution effects in yttrium aluminium garnet: importance of solid state NMR and EPR methods. Journal of Sol-Gel Science and Technology. 2020; 97 (2):479-487.
Chicago/Turabian StyleA. Laurikenas; D. Sakalauskas; A. Marsalka; R. Raudonis; A. Antuzevics; V. Balevicius; A. Zarkov; A. Kareiva. 2020. "Investigation of lanthanum substitution effects in yttrium aluminium garnet: importance of solid state NMR and EPR methods." Journal of Sol-Gel Science and Technology 97, no. 2: 479-487.
For the first time to the best of our knowledge, cobalt-chromium spinels CoCr2–xGaxO4 with different amounts of gallium (x = 0−2 with a step of 0.5) were synthesized via the aqueous sol–gel route as ceramic pigments. The phase composition, crystallite size, morphological features, and color parameters of new compositions and their corresponding ceramic glazes were investigated using XRD, CIELab, SEM, and optical microscopy. It was demonstrated that the formation of single-phase CoCr2–xGaxO4 samples was problematic. Full substitution of Cr3+ by Ga3+ ion in the spinel resulted in the formation of light blue powders, which yielded violetish blue color for the corresponding ceramic glaze.
Egle Grazenaite; Edita Garskaite; Zivile Stankeviciute; Eva Raudonyte-Svirbutaviciene; Aleksej Zarkov; Aivaras Kareiva. Ga-Substituted Cobalt-Chromium Spinels as Ceramic Pigments Produced by Sol–Gel Synthesis. Crystals 2020, 10, 1078 .
AMA StyleEgle Grazenaite, Edita Garskaite, Zivile Stankeviciute, Eva Raudonyte-Svirbutaviciene, Aleksej Zarkov, Aivaras Kareiva. Ga-Substituted Cobalt-Chromium Spinels as Ceramic Pigments Produced by Sol–Gel Synthesis. Crystals. 2020; 10 (12):1078.
Chicago/Turabian StyleEgle Grazenaite; Edita Garskaite; Zivile Stankeviciute; Eva Raudonyte-Svirbutaviciene; Aleksej Zarkov; Aivaras Kareiva. 2020. "Ga-Substituted Cobalt-Chromium Spinels as Ceramic Pigments Produced by Sol–Gel Synthesis." Crystals 10, no. 12: 1078.
In this study, praseodymium substituted yttrium aluminium garnet (Y3-xPrxAl5O12; YPrAG (0 ≤ x ≤ 3)) powders were synthesized by an aqueous sol-gel method and investigated. YPrAG samples were characterized by X-ray diffraction (XRD) analysis, solid state nuclear magnetic resonance (NMR) spectroscopy and scanning electron microscopy (SEM). Luminescence measurements of YPrAG samples were performed as well. It was demonstrated, that three phase regions exist depending on the substitutional level of Pr3+ in Y3-xPrxAl5O12. The single-phase cubic garnets have formed up to x = 0.30. The mixture of garnet and trigonal perovskite (Y1-xPrxAlO3) phase have formed when x is between 0.45 and 2.00. The perovskite phase was the main crystalline phase with further increasing amount of praseodymium, no garnet structure was observed. The amorphous impurity phases were detected by solid state NMR spectroscopy. Two broad and intense emission bands in the UV region peaked at 325 and 381 nm and several sharp emission bands in the visible region were determined by investigating the luminescence properties of the Y3-xPrxAl5O12 mixed-metal oxides.
Andrius Pakalniskis; Arunas Marsalka; Rimantas Raudonis; Vytautas Balevicius; Aleksej Zarkov; Ramunas Skaudzius; Aivaras Kareiva. Sol-gel synthesis and study of praseodymium substitution effects in yttrium aluminium garnet Y3-xPrxAl5O12. Optical Materials 2020, 111, 110586 .
AMA StyleAndrius Pakalniskis, Arunas Marsalka, Rimantas Raudonis, Vytautas Balevicius, Aleksej Zarkov, Ramunas Skaudzius, Aivaras Kareiva. Sol-gel synthesis and study of praseodymium substitution effects in yttrium aluminium garnet Y3-xPrxAl5O12. Optical Materials. 2020; 111 ():110586.
Chicago/Turabian StyleAndrius Pakalniskis; Arunas Marsalka; Rimantas Raudonis; Vytautas Balevicius; Aleksej Zarkov; Ramunas Skaudzius; Aivaras Kareiva. 2020. "Sol-gel synthesis and study of praseodymium substitution effects in yttrium aluminium garnet Y3-xPrxAl5O12." Optical Materials 111, no. : 110586.
The development of proton conductive polyacrylate membranes based on acrylonitrile, sodium 4-vinylbenzenesulfonate, acrylic acid, ethylene glycol dimethacrylate and hybrid polyacrylate/silica membranes is reported in this article. Polyacrylate membranes were synthesized via UV-initiated copolymerization; for the synthesis of polyacrylate/silica membranes 3-methacryloxypropyl trimethoxysilane-based sol–gel system was introduced into the polymerizing mixture.
Mariia Zhyhailo; Iryna Yevchuk; Mykhaylo Yatsyshyn; Sergiy Korniy; Oksana Demchyna; Rostyslav Musiy; Rimantas Raudonis; Aleksej Zarkov; Aivaras Kareiva. Preparation of polyacrylate/silica membranes for fuel cell application by in situ UV polymerization. Chemija 2020, 31, 1 .
AMA StyleMariia Zhyhailo, Iryna Yevchuk, Mykhaylo Yatsyshyn, Sergiy Korniy, Oksana Demchyna, Rostyslav Musiy, Rimantas Raudonis, Aleksej Zarkov, Aivaras Kareiva. Preparation of polyacrylate/silica membranes for fuel cell application by in situ UV polymerization. Chemija. 2020; 31 (4):1.
Chicago/Turabian StyleMariia Zhyhailo; Iryna Yevchuk; Mykhaylo Yatsyshyn; Sergiy Korniy; Oksana Demchyna; Rostyslav Musiy; Rimantas Raudonis; Aleksej Zarkov; Aivaras Kareiva. 2020. "Preparation of polyacrylate/silica membranes for fuel cell application by in situ UV polymerization." Chemija 31, no. 4: 1.
The objective of this study was to verify the feasibility of electrolyzed oxidizing (EO) water as a mouthwash through the evaluation of its in vivo toxicity by embryonic zebrafish and antimicrobial efficacy against Streptococcus mutans (S. mutans). Methodology: Each 1.5–3.0 g of sodium chloride (NaCl), sodium bromide (NaBr), or calcium chloride (CaCl2) were added into an electrolyzer with 300 mL of DD water to produce electrolyzed oxidizing (EO) water. A zebrafish embryo assay was used to evaluate acute toxicity of specimens. Antimicrobial property was conducted with 100 μL microbial count of 1 × 108 cfu/mL S. mutans to blend with each 10 mL specimen of chlorhexidine (CHX) gluconate or hypochlorous acid (HOCl) for various time points. The concentration of viable microorganisms was assessed according to individually standardized inoculum by a plate-count method. Results: Among the EO water produced from NaCl, NaBr, and CaCl2, the EO water from NaCl showed a relatively low mortality rate of zebrafish embryos and was chosen for a detailed investigation. The mortality rates for the groups treated with EO water containing 0.0125% and 0.0250% HOCl were not statically different from those of a negative control, however the mortality rate was 66.7 ± 26.2% in 0.2% CHX gluconate for the same treatment time of 0.5 min. All of the HOCl or 2.0% CHX gluconate groups showed >99.9% antimicrobial effectiveness against S. mutans; while the 0.2% CHX gluconate group showed a bacterial reduction rate of 87.5% and 97.1% for treatment times of 0.5 min and 1.0 min, respectively. Conclusions: Except for the 0.2% CHX gluconate, all the HOCl specimens and 2.0% CHX gluconate revealed similar antimicrobial properties (>99.9%) against S. mutans. The EO water comprised of both 0.0125% and 0.0250% HOCl showed >99.9% antimicrobial efficacy but with little in vivo toxicity, illuminating the possibility as an alternative mouthwash for dental and oral care.
Yi-Ling Hsieh; Jiun-Cheng Yao; Sung-Chih Hsieh; Nai-Chia Teng; You-Tai Chu; Wen-Xin Yu; Chung-He Chen; Liang-Yu Chang; Ching-Shuan Huang; Tzu-Hsin Lee; Aivaras Kareiva; Jen-Chang Yang. The In Vivo Toxicity and Antimicrobial Properties for Electrolyzed Oxidizing (EO) Water-Based Mouthwashes. Materials 2020, 13, 4299 .
AMA StyleYi-Ling Hsieh, Jiun-Cheng Yao, Sung-Chih Hsieh, Nai-Chia Teng, You-Tai Chu, Wen-Xin Yu, Chung-He Chen, Liang-Yu Chang, Ching-Shuan Huang, Tzu-Hsin Lee, Aivaras Kareiva, Jen-Chang Yang. The In Vivo Toxicity and Antimicrobial Properties for Electrolyzed Oxidizing (EO) Water-Based Mouthwashes. Materials. 2020; 13 (19):4299.
Chicago/Turabian StyleYi-Ling Hsieh; Jiun-Cheng Yao; Sung-Chih Hsieh; Nai-Chia Teng; You-Tai Chu; Wen-Xin Yu; Chung-He Chen; Liang-Yu Chang; Ching-Shuan Huang; Tzu-Hsin Lee; Aivaras Kareiva; Jen-Chang Yang. 2020. "The In Vivo Toxicity and Antimicrobial Properties for Electrolyzed Oxidizing (EO) Water-Based Mouthwashes." Materials 13, no. 19: 4299.
Interest in magnetic nanoparticles is primarily due to their practical use. In this work, for the production of nanocrystalline powders of pure and gadolinium doped iron oxides, the extraction-pyrolytic method (EPM) was used. As a precursor, either iron-containing extract (iron (III) caproate in caproic acid) or its mixture with gadolinium-containing extract (gadolinium (III) valerate in valeric acid) was used. The mixed precursor contained 0.5 mol %, 2.5 mol %, 12.5 mol %, 50 mol %, and 75 mol % gadolinium in relation to the iron content. The formation of iron oxide phases, depending on the preparation conditions, was investigated. According to the results obtained, it was demonstrated that the presence of more than 2.5 mol % gadolinium additive in the mixed precursor inhibits the magnetite-to-hematite transformation process during thermal treatment. Produced samples were characterized by XRD and SEM methods, and the magnetic properties were studied.
Vera Serga; Regina Burve; Mikhail Maiorov; Aija Krumina; Ramūnas Skaudžius; Aleksej Zarkov; Aivaras Kareiva; Anatoli I. Popov. Impact of Gadolinium on the Structure and Magnetic Properties of Nanocrystalline Powders of Iron Oxides Produced by the Extraction-Pyrolytic Method. Materials 2020, 13, 4147 .
AMA StyleVera Serga, Regina Burve, Mikhail Maiorov, Aija Krumina, Ramūnas Skaudžius, Aleksej Zarkov, Aivaras Kareiva, Anatoli I. Popov. Impact of Gadolinium on the Structure and Magnetic Properties of Nanocrystalline Powders of Iron Oxides Produced by the Extraction-Pyrolytic Method. Materials. 2020; 13 (18):4147.
Chicago/Turabian StyleVera Serga; Regina Burve; Mikhail Maiorov; Aija Krumina; Ramūnas Skaudžius; Aleksej Zarkov; Aivaras Kareiva; Anatoli I. Popov. 2020. "Impact of Gadolinium on the Structure and Magnetic Properties of Nanocrystalline Powders of Iron Oxides Produced by the Extraction-Pyrolytic Method." Materials 13, no. 18: 4147.
In this study, a highly crystalline bismuth ferrite (BFO) powder was synthesized using a novel, very simple, and cost-effective synthetic approach. It was demonstrated that the optimal annealing temperature for the preparation of highly-pure BFO is 650 °C. At lower or higher temperatures, the formation of neighboring crystal phases was observed. The thermal behavior of BFO precursor gel was investigated by thermogravimetric and differential scanning calorimetry (TG-DSC) measurements. X-ray diffraction (XRD) analysis and Mössbauer spectroscopy were employed for the investigation of structural properties. Scanning electron microscopy (SEM) was used to evaluate morphological features of the synthesized materials. The obtained powders were also characterized by magnetization measurements, which showed antiferromagnetic behavior of BFO powders.
Dovydas Karoblis; Diana Griesiute; Kestutis Mazeika; Dalis Baltrunas; Dmitry V. Karpinsky; Anna Lukowiak; Pawel Gluchowski; Rimantas Raudonis; Arturas Katelnikovas; Aleksej Zarkov; Aivaras Kareiva. A Facile Synthesis and Characterization of Highly Crystalline Submicro-Sized BiFeO3. Materials 2020, 13, 3035 .
AMA StyleDovydas Karoblis, Diana Griesiute, Kestutis Mazeika, Dalis Baltrunas, Dmitry V. Karpinsky, Anna Lukowiak, Pawel Gluchowski, Rimantas Raudonis, Arturas Katelnikovas, Aleksej Zarkov, Aivaras Kareiva. A Facile Synthesis and Characterization of Highly Crystalline Submicro-Sized BiFeO3. Materials. 2020; 13 (13):3035.
Chicago/Turabian StyleDovydas Karoblis; Diana Griesiute; Kestutis Mazeika; Dalis Baltrunas; Dmitry V. Karpinsky; Anna Lukowiak; Pawel Gluchowski; Rimantas Raudonis; Arturas Katelnikovas; Aleksej Zarkov; Aivaras Kareiva. 2020. "A Facile Synthesis and Characterization of Highly Crystalline Submicro-Sized BiFeO3." Materials 13, no. 13: 3035.