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Jairo A. Gómez-Cuaspud
Institute for Research and Innovation in Materials Science and Technology, Universidad Pedagógica y Tecnológica de Colombia, Av. Central del Norte 39-115, Tunja 150003, Colombia

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Journal article
Published: 10 May 2021 in Construction Materials
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Glass-ceramics are advanced inorganic silicate materials that can be obtained by sintering glass powders using a careful temperature control to result in the densification, nucleation, and crystallization of the material. In the current work, three different samples were obtained starting from amorphous silicate materials derived from mixtures of metallurgical slag, coal fly ash, and glass cullet, mixed in different proportions. The as-received waste samples were heat-treated to high temperatures to achieve complete melting at 1200, 1300, and 1400 °C for two hours, performing a rapid cooling in order to yield an amorphous material (glass). The obtained frit was ball-milled to a powder, which was then cold pressed to obtain compact pellets. The thermal treatment of pellets was carried out at 800–1100 °C for 2 h followed by a cooling rate of 10 °C/min to obtain the final glass-ceramics. The microstructure of samples was evaluated with scanning electron microscopy (SEM), which showed heterogeneous conglomerates and clusters of ~20 microns. The formation of crystalline phases was corroborated by means of X-ray diffraction (XRD) analysis, showing the presence of anorthite in all samples. Depending on the sample composition, other crystalline phases such as augite, enstatite, and diopside were detected. Using the Debye–Scherrer equation, it was possible to find the average size of the nano-crystalline domains. The quantification of the non-crystalline or amorphous fraction was also performed. Additionally, the density and porosity of the materials were calculated using the procedures defined in the ASTM C373 and ASTM C20 standards, measuring density values in the range 2.2–3.1 g·cm−3. The apparent porosity was approx. 33% in the three materials. Raman spectroscopy analysis showed characteristic signals associated with crystalline phases containing alumina, silica, iron, and calcium. Overall, the study confirmed the possibility of obtaining glass-ceramics with fine (nanometric) crystal sizes from a combination of silicate waste and the capability of modifying the crystalline composition by changing the proportions of the different wastes in the initial formulations.

ACS Style

Diana M. Ayala Valderrama; Jairo Cuaspud; Nicoletta Taniolo; Aldo Boccaccini. Glass-Ceramic Materials Obtained by Sintering of Vitreous Powders from Industrial Waste: Production and Properties. Construction Materials 2021, 1, 63 -79.

AMA Style

Diana M. Ayala Valderrama, Jairo Cuaspud, Nicoletta Taniolo, Aldo Boccaccini. Glass-Ceramic Materials Obtained by Sintering of Vitreous Powders from Industrial Waste: Production and Properties. Construction Materials. 2021; 1 (1):63-79.

Chicago/Turabian Style

Diana M. Ayala Valderrama; Jairo Cuaspud; Nicoletta Taniolo; Aldo Boccaccini. 2021. "Glass-Ceramic Materials Obtained by Sintering of Vitreous Powders from Industrial Waste: Production and Properties." Construction Materials 1, no. 1: 63-79.

Accepted manuscript
Published: 24 March 2021 in Journal of Physics: Condensed Matter
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The electrical behavior of photovoltaic materials related with Cu2ZnTiS4 and Cu2ZnSnS4 materials were analyzed, as function of synthesis temperature. The samples were obtained through a hydrothermal route and a subsequent thermal treatment of solids at 550°C for 1 hour under nitrogen flow (50 mL min-1). The characterization was done by X-ray diffraction (XRD), ultraviolet spectroscopy (UV), Raman spectroscopy, atomic force microscopy (AFM) and solid state impedance spectroscopy (IS) techniques. The structural characterization, confirm the obtention of a tetragonal material with spatial group I-42m, oriented along (1 1 2) facet, with nanometric crystal sizes (5-6 nm). The AFM and Raman analysis confirm a high level of chemical homogeneity and correlation with the synthesis temperature, associated with the roughness of the samples. The UV spectroscopy confirm a band gap around 1.4-1.5 eV, evidencing the effectiveness of the synthesis process. The impedance spectroscopy results at room temperature with a probability of 95%, confirm the reliability of data in relation with the Kramers-Kronig equations, which allow to relate the values of real and imaginary impedance. The mathematical modelling and the Nyquist plots allowed to obtain information of the conductance, reactance and inductance, achieving conductivity values around 10-5 and 10-3 Ω-1. m-1.

ACS Style

M Patarroyo Mesa; Y T Castellanos Báez; María Alejandra Cerón-Achicanoy; Jairo Alberto Gómez-Cuaspud; W Aperador Chaparro; E Vera López. Mathematical modelling of the conductivity in CZTiS-CZSnS as a function of synthesis temperature. Journal of Physics: Condensed Matter 2021, 33, 195201 .

AMA Style

M Patarroyo Mesa, Y T Castellanos Báez, María Alejandra Cerón-Achicanoy, Jairo Alberto Gómez-Cuaspud, W Aperador Chaparro, E Vera López. Mathematical modelling of the conductivity in CZTiS-CZSnS as a function of synthesis temperature. Journal of Physics: Condensed Matter. 2021; 33 (19):195201.

Chicago/Turabian Style

M Patarroyo Mesa; Y T Castellanos Báez; María Alejandra Cerón-Achicanoy; Jairo Alberto Gómez-Cuaspud; W Aperador Chaparro; E Vera López. 2021. "Mathematical modelling of the conductivity in CZTiS-CZSnS as a function of synthesis temperature." Journal of Physics: Condensed Matter 33, no. 19: 195201.

Research
Published: 02 March 2021 in Journal of the Australian Ceramic Society
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Five compositions of the system LaFe0.2Cr0.8-XCoXO3 (x = 0.0, 0.2, 0.4, 0.6, 0.8) were synthesized by using a combustion technique to investigate the structural and morphological properties of doped LaCrO3 perovskite oxides. The optimal physicochemical conditions for the synthesis of the materials from citrate precursors at low temperature were studied through gravimetric and differential thermal analysis (TGA-DTA). X-ray diffraction (XRD) and electron microscopy (SEM-TEM) characterization of the calcined oxides confirmed the formation of a single perovskite-type structure in all the materials. The incorporation of cobalt into the structure was associated with an evolution from a rhombohedral R3-c to an orthorhombic Pnma 62 structure, with nanometric particle sizes and relevant surface properties. The results obtained from Raman and X-ray photoelectron spectroscopy (XPS) evidenced that the chemical composition and the electronic state of the cations were in accordance with the proposed system and the employed synthesis method. The conversion of CO and O2 was between 83.5 and 100% for all oxides, depending on the cobalt content, and the positive effect of temperature on the conversion and the selectivity for the formation of CO2. Stability tests confirmed a stable conversion of CO and O2, with high initial values around 96% ± 0.97, which stabilized at 83.5% ± 0.87 for the less reactive materials.

ACS Style

Wilson Rativa-Parada; Jairo A. Gómez-Cuaspud; Martin Schmal; Andrés F. Cruz-Pacheco; Enrique Vera-López. Structural and morphological characterization of the perovskite LaFe0.2Cr0.8-xCoxO3 (x = 0.0, 0.2, 0.4, 0.6, 0.8) for selective oxidation of CO. Journal of the Australian Ceramic Society 2021, 57, 767 -781.

AMA Style

Wilson Rativa-Parada, Jairo A. Gómez-Cuaspud, Martin Schmal, Andrés F. Cruz-Pacheco, Enrique Vera-López. Structural and morphological characterization of the perovskite LaFe0.2Cr0.8-xCoxO3 (x = 0.0, 0.2, 0.4, 0.6, 0.8) for selective oxidation of CO. Journal of the Australian Ceramic Society. 2021; 57 (3):767-781.

Chicago/Turabian Style

Wilson Rativa-Parada; Jairo A. Gómez-Cuaspud; Martin Schmal; Andrés F. Cruz-Pacheco; Enrique Vera-López. 2021. "Structural and morphological characterization of the perovskite LaFe0.2Cr0.8-xCoxO3 (x = 0.0, 0.2, 0.4, 0.6, 0.8) for selective oxidation of CO." Journal of the Australian Ceramic Society 57, no. 3: 767-781.

Preprint content
Published: 26 September 2020
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ACS Style

Jorge Muñoz Malpica; Jairo Gomez-Cuaspud; Enrique Vera-Lopez. Structural and Electronic Properties of Co-doped CZTSe System due the given Synthesis Parameters in Combustion Method. 2020, 1 .

AMA Style

Jorge Muñoz Malpica, Jairo Gomez-Cuaspud, Enrique Vera-Lopez. Structural and Electronic Properties of Co-doped CZTSe System due the given Synthesis Parameters in Combustion Method. . 2020; ():1.

Chicago/Turabian Style

Jorge Muñoz Malpica; Jairo Gomez-Cuaspud; Enrique Vera-Lopez. 2020. "Structural and Electronic Properties of Co-doped CZTSe System due the given Synthesis Parameters in Combustion Method." , no. : 1.

Journal article
Published: 12 June 2020 in Universitas Scientiarum
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Lithium cobalt oxide (LiCoO2) is one of the most relevant components in lithium-ion batteries. The array of sought-after features of LiCoO2 depends on its synthesis method. In this work we synthesized and characterized a nanocrystalline LiCoO2 oxide obtained with a wet chemistry synthesis method. The oxide obtained was a homogeneous powder in the nanometric range (5-8 nm) and exhibited a series of improved properties. Characterization by FTIR and UV-Vis techniques led to identifying citrate species as main products in the first step of the synthesis process. X-ray diffraction (XRD), Raman, and transmission electron microscopy (TEM) characterizations led to identifying a pure crystalline phase of the synthesized LiCoO2 oxide. Steady state electrical characterization and solid-state impedance spectroscopy determined the high conductance of the synthesized oxide. All these features are desirable in the design of cathodes for lithium ion batteries.

ACS Style

Jairo A. Gómez-Cuaspud; Ariatna Y Neira-Guio; Enrique Vera-López; Luís C. Canaría-Camargo. Chemical synthesis and steady state characterization of a nanocrystalline lithium cobalt oxide. Universitas Scientiarum 2020, 25, 203 -225.

AMA Style

Jairo A. Gómez-Cuaspud, Ariatna Y Neira-Guio, Enrique Vera-López, Luís C. Canaría-Camargo. Chemical synthesis and steady state characterization of a nanocrystalline lithium cobalt oxide. Universitas Scientiarum. 2020; 25 (2):203-225.

Chicago/Turabian Style

Jairo A. Gómez-Cuaspud; Ariatna Y Neira-Guio; Enrique Vera-López; Luís C. Canaría-Camargo. 2020. "Chemical synthesis and steady state characterization of a nanocrystalline lithium cobalt oxide." Universitas Scientiarum 25, no. 2: 203-225.

Journal article
Published: 19 May 2020 in Polymers
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Polyaniline (PANI) has recently gained great attention due to its outstanding electrical properties and ease of processability; these characteristics make it ideal for the manufacturing of polymer blends. In this study, the processing and piezoresistive characterization of polymer composites resulting from the blend of PANI with ultra-high molecular weight polyethylene (UHMWPE) in different weight percentages (wt %) is reported. The PANI/UHMWPE composites were uniformly homogenized by mechanical mixing and the pellets were manufactured by compression molding. A total of four pellets were manufactured, with PANI percentages of 20, 25, 30 and 35 wt %. Fourier-transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), differential thermal analysis (DTA), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) were used to confirm the effective distribution of PANI and UHMWPE particles in the pellets. A piezoresistive characterization was performed on the basis of compressive forces at different voltages; it was found that the error metrics of hysteresis and drift were influenced by the operating voltage. In general, larger voltages lowered the error metrics, but a reduction in sensor sensitivity came along with voltage increments. In an attempt to explain such a phenomenon, the authors developed a microscopic model for the piezoresistive response of PANI composites, aiming towards a broader usage of PANI composites in strain/stress sensing applications as an alternative to carbonaceous materials.

ACS Style

Andrés Felipe Cruz-Pacheco; Leonel Paredes-Madrid; Jahir Orozco; Jairo Alberto Gómez-Cuaspud; Carlos R. Batista-Rodríguez; Carlos Andrés Palacio Gómez. Assessing the Influence of the Sourcing Voltage on Polyaniline Composites for Stress Sensing Applications. Polymers 2020, 12, 1164 .

AMA Style

Andrés Felipe Cruz-Pacheco, Leonel Paredes-Madrid, Jahir Orozco, Jairo Alberto Gómez-Cuaspud, Carlos R. Batista-Rodríguez, Carlos Andrés Palacio Gómez. Assessing the Influence of the Sourcing Voltage on Polyaniline Composites for Stress Sensing Applications. Polymers. 2020; 12 (5):1164.

Chicago/Turabian Style

Andrés Felipe Cruz-Pacheco; Leonel Paredes-Madrid; Jahir Orozco; Jairo Alberto Gómez-Cuaspud; Carlos R. Batista-Rodríguez; Carlos Andrés Palacio Gómez. 2020. "Assessing the Influence of the Sourcing Voltage on Polyaniline Composites for Stress Sensing Applications." Polymers 12, no. 5: 1164.

Journal article
Published: 09 December 2019 in Fuel
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Coal fly ash (CFA) was obtained from the Sochagota TermoPaipa IV power plant in Boyacá Colombia. CFA was subjected to a hydrothermal activation with NaOH. Morphology, elemental and mineralogical composition and magnetic properties of the obtained products were studied by means of SEM-EDX, XRD and VSM. Activation with NaOH (4–5 M) between 80 and 150 °C for 24 h produced cancrinite zeolite; activation with NaOH at 2 and 3 M at 95 °C produced analcime zeolite. It was found out, that the synthesized zeolites exhibit a ferrimagnetic behavior due to iron coming from CFA. The magnetic response of the obtained products allows the use of these materials to environmental applications in aqueous medium. Adsorption test for methylene blue was performed for an analcime and cancrinite zeolite, the results show that equilibrium is reached after 60 min. The data of adsorption isotherms for analcime and cancrinite zeolite were fitted to Freundlich and Langmuir model, respectively. The synthesized zeolites from CFA were successfully used to remove methylene blue from aqueous solution.

ACS Style

G.I. Supelano; Jairo Alberto Gómez Cuaspud; Luis Carlos Moreno-Aldana; C. Ortiz; C.A. Trujillo; C.A. Palacio; C.A. Parra Vargas; Carlos Andrés Palacio Gómez. Synthesis of magnetic zeolites from recycled fly ash for adsorption of methylene blue. Fuel 2019, 263, 116800 .

AMA Style

G.I. Supelano, Jairo Alberto Gómez Cuaspud, Luis Carlos Moreno-Aldana, C. Ortiz, C.A. Trujillo, C.A. Palacio, C.A. Parra Vargas, Carlos Andrés Palacio Gómez. Synthesis of magnetic zeolites from recycled fly ash for adsorption of methylene blue. Fuel. 2019; 263 ():116800.

Chicago/Turabian Style

G.I. Supelano; Jairo Alberto Gómez Cuaspud; Luis Carlos Moreno-Aldana; C. Ortiz; C.A. Trujillo; C.A. Palacio; C.A. Parra Vargas; Carlos Andrés Palacio Gómez. 2019. "Synthesis of magnetic zeolites from recycled fly ash for adsorption of methylene blue." Fuel 263, no. : 116800.

Conference paper
Published: 28 November 2019 in Journal of Physics: Conference Series
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The current work reports the synthesis and characterization of a photovoltaic material based on the CuIn1−xGaXSe2(X = 0.3 y 0.5) system, making use of the doctor blade method. For this purpose, homogeneous inks were obtained and worked under previous stoichiometry arrangement. The deposition process of thin films, were made in a heating plate on conventional glass substrates, previously washed and treated for this purpose. Once the layers of Cu, In, and Ga were deposited by chemical bath, a thermal treatment was performed at 550 °C for 30 min in a conditioned oven, in which the selenization process was performed. The obtained films were characterized by X-ray diffraction, Raman spectroscopy, solid-state impedance spectroscopy, UV spectroscopy and scanning electron microscopy techniques. The identification of the main crystalline phase could be corroborated, as well as the conductive and optoelectronic behavior of the solids in accordance with reported in literature. Simultaneously, it was checked that the method used allows obtaining layers of an optimum thickness, in order to be used as an absorbent layer in the design of solar devices.

ACS Style

Y T Castellanos Báez; E A Torres-Barahona; Jairo Alberto Gómez Cuaspud; E Vera-López; Y Pineda-Triana. Synthesis of a chalcopyrite material, based on CuIn1−xGaXSe2(X = 0.3 y 0.5), for application as semiconductor layer, deposited by a low-cost technique. Journal of Physics: Conference Series 2019, 1386, 012094 .

AMA Style

Y T Castellanos Báez, E A Torres-Barahona, Jairo Alberto Gómez Cuaspud, E Vera-López, Y Pineda-Triana. Synthesis of a chalcopyrite material, based on CuIn1−xGaXSe2(X = 0.3 y 0.5), for application as semiconductor layer, deposited by a low-cost technique. Journal of Physics: Conference Series. 2019; 1386 (1):012094.

Chicago/Turabian Style

Y T Castellanos Báez; E A Torres-Barahona; Jairo Alberto Gómez Cuaspud; E Vera-López; Y Pineda-Triana. 2019. "Synthesis of a chalcopyrite material, based on CuIn1−xGaXSe2(X = 0.3 y 0.5), for application as semiconductor layer, deposited by a low-cost technique." Journal of Physics: Conference Series 1386, no. 1: 012094.

Conference paper
Published: 28 November 2019 in Journal of Physics: Conference Series
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This research was conducted to identify two acceptable precursors and methods of synthesis for the manufacture of photovoltaic cells. The kesterite Cu2ZnSnSe4, a promising material for solar cell applications, was synthesized from metal salts of Cu, Zn, Sn, and Se, by two low-cost routes: the direct dissolution of metal nitrates, and coprecipitation of selenites. In both cases, inks were obtained and deposited as thin-films by the Doctor Blade technique on glass substrates coated with molybdenum. The films were annealed in an oven at 550 °C by 30 minutes. The phases of each thin film were analyzed by X-ray diffraction and Raman scattering. The morphology and the thickness of the layers were observed using a scanning electron microscope. The optical band gap was determined by ultraviolet-visible spectroscopy and the Tauc equation. The results confirmed the main phase of kesterite material, consistent with a tetragonal crystalline system oriented along the plane (112). These values are consistent with those found by Raman spectroscopy, where the main vibrational mode was identified at 173 cm−1 and 196 cm−1, characteristic of mode A vibration, and 243 cm−1 of mode B vibration; typical of kesterite. Simultaneously, a band gap of 0.89 eV was identified. These results demonstrate the effectiveness of the selenite's coprecipitation method for synthesis of kesterite, without evidence of secondary phases. This determines the possibility of using this material in solar cell applications.

ACS Style

E A Torres-Barahona; Y Castellanos-Báez; Jairo Alberto Gómez Cuaspud; E Vera-López; J B Carda; Y Pineda-Triana. Synthesis of Cu2ZnSnSe4 from nitrate and selenite inks for use as an absorbent layer in the design of solar cells. Journal of Physics: Conference Series 2019, 1386, 012096 .

AMA Style

E A Torres-Barahona, Y Castellanos-Báez, Jairo Alberto Gómez Cuaspud, E Vera-López, J B Carda, Y Pineda-Triana. Synthesis of Cu2ZnSnSe4 from nitrate and selenite inks for use as an absorbent layer in the design of solar cells. Journal of Physics: Conference Series. 2019; 1386 (1):012096.

Chicago/Turabian Style

E A Torres-Barahona; Y Castellanos-Báez; Jairo Alberto Gómez Cuaspud; E Vera-López; J B Carda; Y Pineda-Triana. 2019. "Synthesis of Cu2ZnSnSe4 from nitrate and selenite inks for use as an absorbent layer in the design of solar cells." Journal of Physics: Conference Series 1386, no. 1: 012096.

Conference paper
Published: 28 November 2019 in Journal of Physics: Conference Series
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The present work describes the obtaining of semiconductor materials with kesterite structure by a hydrothermal methodology. The obtained kesterite has a structural modification of the conventional Cu2ZnSnS4 structure with the insertion of titanium instead of tin, in order to obtain Cu2ZnTiS4. The precursors of this material, metallic salts of copper, zinc acetate, titanium butoxide and thiourea were added in a hermetic steel reactor, controlling time (24 hours, 48 hours and 72 hours) and temperature (200 °C — 300 °C). To evaluate the synthesis, the materials obtained were analysed by different characterization techniques (X-ray diffraction, scanning electron microscopy, solid state impedance). The results show that material with the conditions of synthesis 48 hours and 300 °C, exhibit the best textural and electrical results in terms of economy process. The X-ray diffraction analysis shows secondary phases, which can possibly be eliminated with a thermal treatment, since most of the secondary phases (such ZnS and Cu2S) can be eliminated by combustion in an inert atmosphere. The results showed that the increase in the temperature of synthesis decreases the formation of amorphous agglomerates, improving the morphology of the material. The characterization of the materials showed that the Cu2ZnSnS4 phase is possible to obtain by hydrothermal synthesis.

ACS Style

H G Pérez Bustos; Jairo Alberto Gómez Cuaspud; Y Pineda-Triana; E Vera-López; M Patarroyo-Mesa. Evaluation of semiconductor materials by hydrothermal synthesis. Journal of Physics: Conference Series 2019, 1386, 012097 .

AMA Style

H G Pérez Bustos, Jairo Alberto Gómez Cuaspud, Y Pineda-Triana, E Vera-López, M Patarroyo-Mesa. Evaluation of semiconductor materials by hydrothermal synthesis. Journal of Physics: Conference Series. 2019; 1386 (1):012097.

Chicago/Turabian Style

H G Pérez Bustos; Jairo Alberto Gómez Cuaspud; Y Pineda-Triana; E Vera-López; M Patarroyo-Mesa. 2019. "Evaluation of semiconductor materials by hydrothermal synthesis." Journal of Physics: Conference Series 1386, no. 1: 012097.

Conference paper
Published: 28 November 2019 in Journal of Physics: Conference Series
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ACS Style

G Y Soracá-Pérez; D K Gómez-Reyes; Jairo Alberto Gómez Cuaspud; E Vera-López; Y Pineda-Triana. Synthesis and characterization of a hybrid perovskite to be applied as an absorbent layer in solar cell. Journal of Physics: Conference Series 2019, 1386, 1 .

AMA Style

G Y Soracá-Pérez, D K Gómez-Reyes, Jairo Alberto Gómez Cuaspud, E Vera-López, Y Pineda-Triana. Synthesis and characterization of a hybrid perovskite to be applied as an absorbent layer in solar cell. Journal of Physics: Conference Series. 2019; 1386 ():1.

Chicago/Turabian Style

G Y Soracá-Pérez; D K Gómez-Reyes; Jairo Alberto Gómez Cuaspud; E Vera-López; Y Pineda-Triana. 2019. "Synthesis and characterization of a hybrid perovskite to be applied as an absorbent layer in solar cell." Journal of Physics: Conference Series 1386, no. : 1.

Journal article
Published: 25 June 2019 in Materials
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Developments in the field of materials science are contributing to providing solutions for the recycling of industrial residues to develop new materials. Such approaches generate new products and provide optimal alternatives to the final disposal of different types of industrial wastes. This research focused on identifying and characterizing slag, fly ash, and glass cullet from the Boyacá region in Colombia as raw materials for producing glass-ceramics, with the innovative aspect of the use of these three residues without the addition of nucleating agents to produce the glass-ceramics. To characterize the starting materials, X-ray diffraction (XRD), X-ray fluorescence (XRF), and Scanning Electron Microscopy (SEM) techniques were used. The results were used to evaluate the best conditions to produce mixtures of the three waste components and to determine the specific compositions of glass-ceramics to achieve products with attractive technical properties for potential industrial applications. The proposed mixtures were based on three compositions: Mixture 1, 2, and 3. The materials were obtained through thermal treatment at 1200 °C in a tubular furnace in accordance with the results of a comprehensive characterization using thermal analysis. The microstructure, thermal stability, and structural characteristics of the samples were examined through SEM, differential thermal analysis (DTA), and XRD analyses, which showed that the main crystalline phases were diopside and anorthite, with a small amount of enstatite and gehlenite. The obtained glass-ceramics showed properties of technical significance for structural applications.

ACS Style

Diana M. Ayala Valderrama; Jairo A. Gómez Cuaspud; Judith A. Roether; Aldo R. Boccaccini. Development and Characterization of Glass-Ceramics from Combinations of Slag, Fly Ash, and Glass Cullet without Adding Nucleating Agents. Materials 2019, 12, 2032 .

AMA Style

Diana M. Ayala Valderrama, Jairo A. Gómez Cuaspud, Judith A. Roether, Aldo R. Boccaccini. Development and Characterization of Glass-Ceramics from Combinations of Slag, Fly Ash, and Glass Cullet without Adding Nucleating Agents. Materials. 2019; 12 (12):2032.

Chicago/Turabian Style

Diana M. Ayala Valderrama; Jairo A. Gómez Cuaspud; Judith A. Roether; Aldo R. Boccaccini. 2019. "Development and Characterization of Glass-Ceramics from Combinations of Slag, Fly Ash, and Glass Cullet without Adding Nucleating Agents." Materials 12, no. 12: 2032.

Article
Published: 30 May 2019 in International Journal of Applied Ceramic Technology
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Nanoparticles of Ce1‐xPrxO2 (X: 0.6 and 0.8), were synthesized by the combustion method using citric acid (CA) as chelating and fuel agent. The X‐ray diffraction patterns and Rietveld refinements confirm that samples shown a single phase in a cubic fluorite structure, with an increase in the lattice parameter as a function of Pr concentration. The crystallite size domains obtained by the Scherrer formula, confirm values around 10 and 37 nm. The scanning electron microscopy (SEM) images, show that the solids are composed of dense heterogeneous aggregates. The X‐ray photoelectron spectroscopy (XPS), reveals that oxides are composed of cerium and praseodymium cations in oxidation states 4+ and 3+ respectively. The TPR‐H2 profiles indicate that cerium and praseodymium cations present in the obtained systems are completely reduced to Ce3+ and Pr3+ at temperatures above 790 °C. The impedance spectroscopy data at room temperature showed that the conduction processes for the two systems take place at the grain boundaries. The Ce0.2Pr0.8O2 system offer lower resistance, due to the high amount of Pr3+ ions inserted in the structure and the high amount of oxygen vacancies formed in the synthesis process. This article is protected by copyright. All rights reserved.

ACS Style

Andrés F. Cruz‐Pacheco; Jairo Alberto Gómez Cuaspud; Carlos A. Parra Vargas; Juan B. Carda Castello. Effect of Pr on the electrical and chemical properties of cerium oxide prepared by combustion method. International Journal of Applied Ceramic Technology 2019, 16, 2482 -2492.

AMA Style

Andrés F. Cruz‐Pacheco, Jairo Alberto Gómez Cuaspud, Carlos A. Parra Vargas, Juan B. Carda Castello. Effect of Pr on the electrical and chemical properties of cerium oxide prepared by combustion method. International Journal of Applied Ceramic Technology. 2019; 16 (6):2482-2492.

Chicago/Turabian Style

Andrés F. Cruz‐Pacheco; Jairo Alberto Gómez Cuaspud; Carlos A. Parra Vargas; Juan B. Carda Castello. 2019. "Effect of Pr on the electrical and chemical properties of cerium oxide prepared by combustion method." International Journal of Applied Ceramic Technology 16, no. 6: 2482-2492.

Journal article
Published: 02 February 2019 in Coatings
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The coating of polymeric substrate polyetheretherketone (PEEK) with silver nanoparticles (AgNPs) was carried out by a wet chemical route at room temperature. The coating process was developed from the Tollens reagent and D-glucose as reducing agent. The resulting composite exhibited antimicrobial activity. The PEEK films were coated with a single layer and two layers of silver nanoparticles in various concentrations. The crystallographic properties of the polymer and the silver nanoparticles were analyzed by X-ray diffraction (XRD). Fourier transform infrared spectra (FTIR) show the interaction between the silver nanoparticles with the polymeric substrate. Transmission electron microscope (TEM) images confirmed the obtaining of metallic nanoparticles with average sizes of 25 nm. It was possible to estimate the amount of silver deposited on PEEK with the help of thermogravimetric analysis. The morphology and shape of the AgNPs uniformly deposited on the PEEK films was ascertained by the techniques of scanning electron microscopy (SEM) and atomic force microscopy (AFM), evidencing the increase in the amount of silver by increasing the concentration of the metal precursor. Finally, the antibacterial activity of the films coated with Ag in Escherichia coli, Serratia marcescens and Bacillus licheniformis was evaluated, evidencing that the concentration of silver is crucial in the cellular replication of the bacteria.

ACS Style

Andrés Felipe Cruz-Pacheco; Deysi Tatiana Muñoz-Castiblanco; Jairo Alberto Gómez Cuaspud; Leonel Paredes-Madrid; Carlos Arturo Parra Vargas; José Jobanny Martínez Zambrano; Carlos Andrés Palacio Gómez. Coating of Polyetheretherketone Films with Silver Nanoparticles by a Simple Chemical Reduction Method and Their Antibacterial Activity. Coatings 2019, 9, 91 .

AMA Style

Andrés Felipe Cruz-Pacheco, Deysi Tatiana Muñoz-Castiblanco, Jairo Alberto Gómez Cuaspud, Leonel Paredes-Madrid, Carlos Arturo Parra Vargas, José Jobanny Martínez Zambrano, Carlos Andrés Palacio Gómez. Coating of Polyetheretherketone Films with Silver Nanoparticles by a Simple Chemical Reduction Method and Their Antibacterial Activity. Coatings. 2019; 9 (2):91.

Chicago/Turabian Style

Andrés Felipe Cruz-Pacheco; Deysi Tatiana Muñoz-Castiblanco; Jairo Alberto Gómez Cuaspud; Leonel Paredes-Madrid; Carlos Arturo Parra Vargas; José Jobanny Martínez Zambrano; Carlos Andrés Palacio Gómez. 2019. "Coating of Polyetheretherketone Films with Silver Nanoparticles by a Simple Chemical Reduction Method and Their Antibacterial Activity." Coatings 9, no. 2: 91.

Journal article
Published: 08 October 2018 in Revista ION
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Karen Nayib Martínez-González; Universidad Pedagógica Y Tecnológica De Colombia; Andrés Felipe Cruz-Pacheco; Jairo Alberto Gómez Cuaspud; Carlos Arturo Parra Vargas. Structural and Magnetic Evaluation of the CaTi1- xMxO3 (M = Dy, Ho, Gd) (x = 0.5) System. Revista ION 2018, 31, 81 -88.

AMA Style

Karen Nayib Martínez-González, Universidad Pedagógica Y Tecnológica De Colombia, Andrés Felipe Cruz-Pacheco, Jairo Alberto Gómez Cuaspud, Carlos Arturo Parra Vargas. Structural and Magnetic Evaluation of the CaTi1- xMxO3 (M = Dy, Ho, Gd) (x = 0.5) System. Revista ION. 2018; 31 (1):81-88.

Chicago/Turabian Style

Karen Nayib Martínez-González; Universidad Pedagógica Y Tecnológica De Colombia; Andrés Felipe Cruz-Pacheco; Jairo Alberto Gómez Cuaspud; Carlos Arturo Parra Vargas. 2018. "Structural and Magnetic Evaluation of the CaTi1- xMxO3 (M = Dy, Ho, Gd) (x = 0.5) System." Revista ION 31, no. 1: 81-88.

Journal article
Published: 29 January 2018 in Revista de Ciencias
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En estetrabajo se explora la síntesis y caracterización de un óxido cerámico tipo La0.8 Sr0.2 CrO3, a través de intermediarios tipo citrato que propiciaron la obtención de una fase cristalina pura del material a 900 °C.

ACS Style

Sistemas Revistas; Ariatna Neira Guio; Jairo Alberto Gómez Cuaspud; Enrique Vera López. Síntesis y caracterización de una perovskita simple del tipo La0.8 Sr0.2CrO3. Revista de Ciencias 2018, 20, 16 -16.

AMA Style

Sistemas Revistas, Ariatna Neira Guio, Jairo Alberto Gómez Cuaspud, Enrique Vera López. Síntesis y caracterización de una perovskita simple del tipo La0.8 Sr0.2CrO3. Revista de Ciencias. 2018; 20 (1):16-16.

Chicago/Turabian Style

Sistemas Revistas; Ariatna Neira Guio; Jairo Alberto Gómez Cuaspud; Enrique Vera López. 2018. "Síntesis y caracterización de una perovskita simple del tipo La0.8 Sr0.2CrO3." Revista de Ciencias 20, no. 1: 16-16.

Conference paper
Published: 28 December 2017 in Journal of Physics: Conference Series
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This paper describes the synthesis and characterization of two spinel and olivine-type multicomponent oxides based on LiMO2 and LiM2O4 systems (M=Co and Mn), which represent the current state of the art in the development of cathodes for Li-ion batteries. A simple combustion synthesis process was employed to obtain the nanometric oxides in powder form (crystal sizes around 5-8nm), with a number of improved surface characteristics. The characterization by X-Ray Diffraction (XRD), Scanning and Transmission Electron Microscopy (SEM, TEM) and X-Ray Fluorescence (XRF), allowed to evaluate the morphology and the stoichiometric compositions of solids, obtaining a concordant pure crystalline phase of LiCoO2 and LiMn2O4 oxides identified in a rhombohedral and cubic phase with punctual group R-3m (1 6 6) and Fm-3m (2 2 5) respectively. The electrical characterization of materials developed by impedance spectroscopy solid state, allowed to determine a p-type semiconducting behaviour with conductivity values of 6.2×10-3 and 2.7×10-7 S for LiCoO2 and LiMn2O4 systems, consistent with the state of the art for such materials.

ACS Style

A Y Neira-Guio; Jairo Alberto Gómez Cuaspud; E Vera López; Y Pineda Triana. Chemical obtaining of LiMO2and LiM2O4(M=Co, Mn) oxides, for cathodic applications in Li-ion batteries. Journal of Physics: Conference Series 2017, 935, 012066 .

AMA Style

A Y Neira-Guio, Jairo Alberto Gómez Cuaspud, E Vera López, Y Pineda Triana. Chemical obtaining of LiMO2and LiM2O4(M=Co, Mn) oxides, for cathodic applications in Li-ion batteries. Journal of Physics: Conference Series. 2017; 935 (1):012066.

Chicago/Turabian Style

A Y Neira-Guio; Jairo Alberto Gómez Cuaspud; E Vera López; Y Pineda Triana. 2017. "Chemical obtaining of LiMO2and LiM2O4(M=Co, Mn) oxides, for cathodic applications in Li-ion batteries." Journal of Physics: Conference Series 935, no. 1: 012066.

Conference paper
Published: 28 December 2017 in Journal of Physics: Conference Series
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This paper describes the results of the synthesis and characterization of a quaternary semiconductor based on Cu2ZnTiS4 (abbreviated CZTiS), using a hydrothermal technique. The results confirm that time (24, 48 and 72 hours) and temperature (250, 275, and 300°C) factors, used in synthesis process, regulate different levels of electrical conductivity in these materials. The results of ultraviolet spectroscopy (UV) analysis, confirm the production of semiconductor solids with Band-gap values around 1.4eV, being coherent with a strong absorption in the ultraviolet region. The X-Ray Diffraction analysis (XRD), confirm that there is an opposite and proportional relationship between the crystal sizes, the reaction times and the synthesis temperature. In all cases, the particle sizes were 50-100nm. The results derived from Scanning Electron Microscopy (SEM), confirm the obtaining of homogenous materials with optimal morphological properties in accordance with synthesis method. Similarly, the composition values derived from the Energy-Dispersion X-ray Spectroscopy analysis (EDS), shown that obtained compositions are in agree with expected values. Finally, the results of electric characterization, confirm that used synthesis parameters show a strong dependence on the conductive behaviour of solids being the most relevant result the shown by the solid obtained at 300°C and 72 hours of reaction in accordance with preliminary works.

ACS Style

H G Pérez Bustos; M Patarroyo-Mesa; Jairo Alberto Gómez Cuaspud; Y Pineda-Triana; E Vera-López. Hydrothermal synthesis and characterization of the semiconductor material Cu2ZnTiS4. Journal of Physics: Conference Series 2017, 935, 012065 .

AMA Style

H G Pérez Bustos, M Patarroyo-Mesa, Jairo Alberto Gómez Cuaspud, Y Pineda-Triana, E Vera-López. Hydrothermal synthesis and characterization of the semiconductor material Cu2ZnTiS4. Journal of Physics: Conference Series. 2017; 935 (1):012065.

Chicago/Turabian Style

H G Pérez Bustos; M Patarroyo-Mesa; Jairo Alberto Gómez Cuaspud; Y Pineda-Triana; E Vera-López. 2017. "Hydrothermal synthesis and characterization of the semiconductor material Cu2ZnTiS4." Journal of Physics: Conference Series 935, no. 1: 012065.

Conference paper
Published: 28 December 2017 in Journal of Physics: Conference Series
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This article presents the structural and thermal characterization of fly ash, the waste from blast furnace slag and the glass hull, generated as common residues in industry, which cannot be recycled easily or destroyed in a simple and fast way. In the particular case of fly ash, at present are being used as a lightweight aggregate in the production of cement, concrete and additive in the production of glass and glass ceramics. As far as the slag and hull, are being used as additives for the asphalt and concretes, however its use still is restricted, reason why its use in alternative ways are necessary. Initially the chemical composition of residues was established, determining that the fly ashes contains SiO2, Al2O3 and Fe2O3 oxides; 90% of the total composition, was confirmed by X-ray diffraction analysis. As minor constituents, small percentages of Mg, P, S, K, Na and Ti were found. For the slag case, the phases of Fe3O4, Ca3Mg (SiO2)4 and Ca(MgAl)(Si,Al)2O6 were identified, observing the presence of amorphous phase higher than 94% of the total phase of the system. Meanwhile, the glass hull sample showed a higher percentage of 95% amorphicity, mainly identifying a weak signal associated with silicon oxide SiO2. The thermal analyses of the samples, exhibit a decrease in mass for samples between 25-1000°C was observed, which can be attributed to different physical-chemical events that occur in the materials. The heat flow for each sample is related with the removal of the water retained by the physisorption processes around 92-110°C in all cases. With this previous characterization of the precursors, a sample was composed using 70% fly ash, 10% slag and 20% of glass hull was composed and treated at 1200°C/1.5 hours, obtaining a dense black glassy material for potential applications in field of the glass ceramics.

ACS Style

D M Ayala Valderrama; Jairo Alberto Gómez Cuaspud. Characterization of fly ash, slag and glass hull for the obtaining of vitreous materials. Journal of Physics: Conference Series 2017, 935, 012040 .

AMA Style

D M Ayala Valderrama, Jairo Alberto Gómez Cuaspud. Characterization of fly ash, slag and glass hull for the obtaining of vitreous materials. Journal of Physics: Conference Series. 2017; 935 (1):012040.

Chicago/Turabian Style

D M Ayala Valderrama; Jairo Alberto Gómez Cuaspud. 2017. "Characterization of fly ash, slag and glass hull for the obtaining of vitreous materials." Journal of Physics: Conference Series 935, no. 1: 012040.

Conference paper
Published: 28 December 2017 in Journal of Physics: Conference Series
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The present work report, the synthesis and characterization of the CuIn0.5Ga0.5Se2 system (abbreviated CIGS), by the implementation of a hydrothermal route, in order to obtain a solid with appropriate properties in terms of surface, morphological and texture properties for potential applications in the design of photovoltaic cells. The synthesis was carried out using the corresponding stoichiometric quantities (Cu:In:Ga:Se 1:0.5:0.5:2), which were mixed in a Teflon vessel under stirring conditions. The homogeneous solution was treated in a steel autoclave at 300°C for 72 hours at the end of which the resulting material was characterized by X-Ray Diffraction (XRD) and Rietveld refinement. The results of the structural characterization allowed to confirm the obtaining of a chalcopyrite type structure, with a I-42 d (122) structure and cell parameters a=0.570, b=0.570, c=1.140nm, α=90, β=90, γ=90° oriented along (1 0 4) facet, detecting the presence of a secondary phases, related with CuInSe and CuIn metallic selenides, derived from synthesis process. The structural refinement allowing to validate the obtaining of a nanometric crystalline material (10-20nm) for potential applications in field of photovoltaic technology.

ACS Style

Y T Castellanos Báez; D A Fuquen Peña; Jairo Alberto Gómez Cuaspud; E Vera-López; Y Pineda-Triana. Hydrothermal synthesis of a photovoltaic material based on CuIn0.5Ga0.5Se2. Journal of Physics: Conference Series 2017, 935, 012004 .

AMA Style

Y T Castellanos Báez, D A Fuquen Peña, Jairo Alberto Gómez Cuaspud, E Vera-López, Y Pineda-Triana. Hydrothermal synthesis of a photovoltaic material based on CuIn0.5Ga0.5Se2. Journal of Physics: Conference Series. 2017; 935 (1):012004.

Chicago/Turabian Style

Y T Castellanos Báez; D A Fuquen Peña; Jairo Alberto Gómez Cuaspud; E Vera-López; Y Pineda-Triana. 2017. "Hydrothermal synthesis of a photovoltaic material based on CuIn0.5Ga0.5Se2." Journal of Physics: Conference Series 935, no. 1: 012004.