Article
Chemistry, Physical
Z. Hayati, B. Hoomehr, F. Khalesi, K. Raeissi
Summary: Titanium dioxide-silica composite nanoparticles were synthesized using a verified Stober sol-gel method. The resulting nanoparticles consisted of titanium dioxide cores surrounded by ultrafine silica particles, forming a thin shell. These nanoparticles were deposited on a stainless steel substrate via electrophoretic deposition to enhance its biological response. The presence of a silica shell increased the surface roughness, eliminated cracks, and improved the adhesion and barrier performance of the coating.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Ceramics
M. A. M. L. Jesus, A. M. Ferreira, L. F. S. Lima, G. F. Batista, R. V. Mambrini, N. D. S. Mohallem
Summary: Micro-mesoporous TiO2/SiO2 nanocomposite powders were successfully synthesized using the sol-gel process, with Si60Ti40 powders exhibiting the highest specific surface area. Si80Ti20 powders showed better degradation of quinoline in the presence of H2O2 compared to pure sol-gel TiO2 powders, attributed to small TiO2 anatase crystallite size, high dispersion, great specific surface area, and formation of Ti-O-Si bond.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Xiaojing Xia, Jue Liu, Yang Liu, Zijie Lei, Yutong Han, Zeping Zheng, Jian Yin
Summary: This study shows the potential application of coatings in protecting buildings from harmful atmospheric effects through a self-cleaning approach. A SiO2-TiO2-PDMS composite coating was prepared on building walls using the sol-gel method. The effects of TEOS and PDMS content on the microstructure, wettability, and self-cleaning performance of the coating were investigated. The results indicated that when the molar ratio of PDMS to TEOS was 1:5, the coating exhibited a maximum static contact angle of 152.6 degrees and showed good self-cleaning ability.
Review
Chemistry, Physical
Ning Wang, Yi Li, Qian Cui, Xiaoyue Sun, Yue Hu, Yunjun Luo, Ran Du
Summary: Metal aerogels (MAs) are a new class of porous materials consisting of nanostructured metals. They possess unique physicochemical properties and show great potential in various fields such as electrocatalysis and sensing. However, due to their short research history, fundamental studies and practical applications of MAs are still limited. Challenges include controlled synthesis, structural diversity, and the correlation between material parameters and properties. Thorough knowledge and design principles of MAs are crucial for further development in this promising field.
ACTA PHYSICO-CHIMICA SINICA
(2023)
Article
Chemistry, Multidisciplinary
Manh-Cuong Le, Thu-Huong Le, Thanh-Huyen Bui Thi, Quang-Dat Nguyen, Thanh-Ha Do Thi, Minh-Nguyet Tran Thi
Summary: The addition of SiO2 in the TiO2/SiO2 nanocomposite significantly enhances the photocatalytic and antibacterial abilities of the silicate coating, with the best performance observed at a SiO2 content of 15%. This is attributed to the larger surface area provided by TiO2/SiO2 Nc (15%) in the W silicate coating, which increases centers for absorption, photocatalytic reactions, and contact between the sample and bacteria.
FRONTIERS IN CHEMISTRY
(2021)
Article
Chemistry, Inorganic & Nuclear
Luis Roberto Ruiz-Ramirez, Jonatan Torres-Perez, Nahum Medellin-Castillo, Simon Yobanny Reyes-Lopez
Summary: The contamination and dispersion of antibiotics through sewage treatment plant effluents is causing the emergence of resistant bacteria, leading to a health emergency. In order to eliminate antibiotics in effluents, advanced oxidation processes, especially photocatalysis, have been used for their efficient degradation. In this study, SiO2-TiO2 fibers with a cylindrical morphology and smooth surface were obtained using sol-gel and electrospinning techniques. By doping the fibers with silver, their photocatalytic properties were enhanced, and the degradation percentage of oxytetracycline increased from 65% to 90% in 7 hours. The improved performance is attributed to the decrease in the banned band energy of SiO2-TiO2 fibers from 3.1eV to 2.5eV due to silver doping.
SOLID STATE SCIENCES
(2023)
Article
Chemistry, Applied
Atheer Al Khudhair, Karim Bouchmella, Radu Dorin Andrei, Ahmad Mehdi, P. Hubert Mutin, Vasile Hulea
Summary: The mixed oxide catalysts of SiO2-Al2O3-NiO with different Si/Al ratio and Ni content were prepared and evaluated in ethylene oligomerization. The study found that Si/Al ratio influenced the materials' texture and acidity, and samples with high Al content exhibited excellent performances. The catalysts compared well with model catalysts prepared by time-consuming multistep procedures from expensive ordered mesoporous silica supports.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Materials Science, Paper & Wood
Andrey Zdravkov, Maria Listratenko, Stanislav Gorbachev, Iraida Osovskaya, Andrey Kanaev, Nikolai Khimich
Summary: Cellulose is used as a template agent to structure anatase TiO2 particles, forming MCC-TiO2 composite photocatalyst with organic-inorganic structures preserved. Materials prepared in caproic acid solvent showed higher photocatalytic activity, explained by the complementary nature of organic and inorganic components.
Article
Multidisciplinary Sciences
Bruna Teixeira da Fonseca, Eliane D'Elia, Jose Marcio Siqueira Junior, Sanair Massafra de Oliveira, Kelly Leite dos Santos Castro, Emerson Schwingel Ribeiro
Summary: The SiO2/TiO2/Nb2O5 material was characterized by various techniques, showing an enhancement of crystalline order with the increase of thermal treatment temperature, successful insertion of Ti and Nb atoms into the silica matrix, and high dispersion of metals on the materials surface confirmed by different analyses.
SCIENTIFIC REPORTS
(2021)
Article
Materials Science, Multidisciplinary
Shumaila Islam, Adil Alshoaibi, Hazri Bakhtiar, Kawther Alamer, Javed Mazher, Zakia Hassan Alhashem, Mohammad Rafe Hatshan, Shrouq H. Aleithan
Summary: Due to polluted water remediation, semiconductor nano photocatalysis has been considered as a promising approach to address the issue. However, the slow reaction rates and high electron-hole recombination have hindered their large-scale applications. In this study, heterogeneous nano photocatalysts, such as sol-gel-based mesoporous titania nanoparticles (TNPs) and silica-titania nanocomposite (STNC) supported with CdTe (CdTe/STNC), were synthesized for photocatalytic applications. The CdTe/STNC catalyst exhibited a large surface area and pore size distribution, and demonstrated high photocatalytic activity with methylene blue degradation of 95% after 180 min of ultraviolet radiation.
MATERIALS RESEARCH BULLETIN
(2023)
Article
Chemistry, Physical
Madara Leimane, Katrina Krizmane, Ivita Bite, Jurgis Grube, Virginija Vitola
Summary: This study demonstrates the synthesis of SrAl2O4 doped with Eu, Dy, and B in a SiO2 glass structure using the low-temperature sol-gel method. By varying the synthesis conditions, water-soluble precursors and a dilute aqueous solution of rare-earth nitrates were used as starting materials, resulting in translucent, persistently luminescent glass. It is concluded that the slow drying procedure is optimal for removing excess water and solvent molecules, while boron plays a crucial role in the formation of trapping centers.
Article
Engineering, Chemical
Ali Ihsan Kaya
Summary: This study aimed to investigate the mechanical properties of new materials produced by combining TiO2, ZnO, SiO2, and Al2O3 under pressure using the hot pressing technique. The materials were characterized using SEM, EDS, and XRD analyses, and their microhardness and tribological properties were studied. The results showed that increasing the alumina content did not significantly affect the XRD analysis, while SEM and EDS analyses revealed a two-phase structure with complex boundaries. Wear tests indicated that the depth and width of the wear track increased with the wear load. Moreover, the Ti55Si15Zn20Al10 material had the highest weight loss, and increasing the Al2O3 content reduced the weight losses. The microhardness value generally increased with the alumina content in the compounds.
Article
Materials Science, Multidisciplinary
Sipei Zhang, Ying Xu, Wen Zhang, Peng Cao
Summary: Cu and Y co-doped TiO2 nanoparticles were prepared using an acid-catalytic sol-gel process, resulting in a single anatase phase with reduced crystallite size. SEM observations showed uniform nanospheres being synthesized under the proposed conditions. XPS results demonstrated the presence of Cu+ and Y3+ ions. The photoactivity of the co-doped TiO2 was improved due to effective separation of electron-hole pairs, increased formation of active radicals, and increased surface area.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Chemistry, Physical
Yuanting Wu, Mengyao Guan, Xiaojing Chang, Jinrong Wang, Shuming Xu
Summary: We constructed a homogeneous double-layer TiO2-ZrO2-SiO2 photocatalyst with multi-heterojunction (D-TZS) using a simple sol-gel method, which effectively improves the photocatalytic property. By investigating various factors, we found that D-TZS can degrade Rh B by about 99.6% within 40 minutes and almost completely degrade it within 60 minutes. This is attributed to the homogeneity, multiple heterojunctions, and oxygen vacancies of D-TZS.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Materials Science, Multidisciplinary
Yuanting Wu, Senmao Ren, Xiaojing Chang, Xinmeng Zhang
Summary: This study demonstrated the preparation of TiO2-ZrO2-SiO2 nano-powders to enhance the synergistic effect of adsorption and degradation in photocatalytic materials. The TiO2-ZrO2-SiO2 system showed excellent photocatalytic performance and adsorption ability, with SiO2 acting as an adsorbent and TiO2-ZrO2 acting synergistically as a photocatalyst. The enhanced photocatalytic ability was attributed to factors such as accelerated mass transfer, narrowed bandgap, and effective charge separation rate. The synergy effect between adsorption and photocatalysis was evaluated using the synergy factor beta, showing remarkable synergistic effect in the TiO2-ZrO2-SiO2 compound system.
Article
Chemistry, Multidisciplinary
L. Irais Vera-Robles, Jaqueline Gonzalez-Gracida, Armin Hernandez-Gordillo, Antonio Campero
Article
Biochemical Research Methods
Citlali Toledo-Nunez, L. Irais Vera-Robles, Izlia J. Arroyo-Maya, Andres Hernandez-Arana
ANALYTICAL BIOCHEMISTRY
(2016)
Article
Biochemistry & Molecular Biology
Irvin Bonola-Gallardo, Maria Esther Irigoyen-Camacho, Liliana Vera-Robles, Antonio Campero, Luis Gomez-Quiroz
BIOLOGICAL TRACE ELEMENT RESEARCH
(2017)
Article
Chemistry, Multidisciplinary
L. Irais Vera-Robles, Luis Escobar-Alarcon, Michel Picquart, J. Luis Hernandez-Pozos, Emmanuel Haro-Poniatowski
Article
Chemistry, Applied
Armin Hernandez-Gordillo, Antonio Campero, L. Irais Vera-Robles
MICROPOROUS AND MESOPOROUS MATERIALS
(2018)
Article
Thermodynamics
Jhoana L. Gonzalez-Cansino, Maria Teresa Vieyra-Eusebio, L. Irais Vera-Robles, Andres Hernandez-Arana
THERMOCHIMICA ACTA
(2019)
Correction
Biochemistry & Molecular Biology
David O. Tovar-Anaya, L. Irais Vera-Robles, M. Teresa Vieyra-Eusebio, Ponciano Garcia-Gutierrez, Francisco Reyes-Espinosa, Andres Hernandez-Arana, J. Alfonso Arroyo-Reyna, Rafael A. Zubillaga
Article
Chemistry, Physical
Armin Hernandez-Gordillo, Sonia Arriaga
Summary: The study focused on using CdS and CuO nanoparticles impregnated on mesoporous TiO2 to create photocatalytic heterojunctions for bacteria inactivation in air. The fluctuation in bacteria concentration during continuous photocatalysis was linked to adsorption-desorption stages of bioaerosols on the catalysts. Thermal gravimetric analysis of regenerated catalysts indicated surface changes hindering bioaerosol adsorption.
Article
Spectroscopy
Ponciano Garcia-Gutierrez, Menandro Camarillo-Cadena, Liliana Vera-Robles, Rafael A. Zubillaga, Andres Hernandez-Arana
Summary: This study evaluates the changes in secondary structures during the unfolding process of yeast triosephosphate isomerase (yTIM) under different pH conditions using CD spectra. The analysis shows that the protein tends to have more unordered structures at high pH. Molecular dynamics simulations confirm these spectroscopic results, but the structural differences between low and high pH unfolded yTIM are relatively small.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Chemistry, Multidisciplinary
Armin Hernandez-Gordillo, Andres Hernandez-Arana, Antonio Campero-Celis, L. Irais Vera-Robles
Article
Materials Science, Multidisciplinary
Reyna Ojeda-Lopez, J. Marcos Esparza-Schulz, Isaac J. Perez-Hermosillo, Armin Hernandez-Gordillo, Armando Dominguez-Ortiz