Article
Polymer Science
Marius Horvath, Katalin Sinko
Summary: The aim of this research was to develop a new, low-cost, and low-energy-consuming method for preparing highly porous silica systems. The precursor gel systems were synthesized using sol-gel chemistry with TEOS and water glass. The impact of the chemical composition, catalysts, pH, and additives on the structure and porosity of the cryogels was investigated. The gel systems were subjected to freeze-drying to obtain porous cryogel silica products with hierarchical structures. The freeze-drying process conditions were also studied to increase the porosity. Small angle X-ray measurements, scanning electron microscopy, and infrared spectroscopy were used to study the gel and cryogel systems.
Article
Materials Science, Ceramics
Peter Adam, Otto Temesi, Zoltan Dankhazi, Constantinos Voniatis, Janos Rohonczy, Katalin Sinko
Summary: The aim of this study is to develop low-cost synthesis routes for producing aluminum oxide ceramic fibers used for high temperature insulation. The synthesis methods of co-precipitation and sol gel chemistry were used, and various chemical additives were tested to find the optimal fiber parameters. The appropriate fiber drawing technique and heat treatment were also determined. The solvent spinning technique was found to be the most efficient method for producing high temperature insulation fibers with specific dimensions.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
Aiman A. Bin Mokaizh, Jun Haslinda Shariffuddin, Abdullah O. Baarimah, Amin Al-Fakih, Abdullah Mohamed, Salem O. Baarimah, Al-Baraa Abdulrahman Al-Mekhlafi, Hamoud Alenezi, Olusegun Abayomi Olalere, Anwar Ameen Hezam Saeed
Summary: Aluminum waste-can management in Malaysia has become a significant environmental and public health issue. This study successfully synthesized high-quality alumina from the collected waste-cans using the sol-gel technique. The synthesized alumina exhibited excellent surface-area characteristics and functional properties comparable with commercially available brands.
Article
Materials Science, Ceramics
Yue Jiang, Qiushuo Mao, Tianhao Ma, Xiaoguang Liu, Yan Li, Shubin Ren, Jialin Sun
Summary: A porous Fe2O3 Al2O3 composite was designed to remove the harmful dye Congo red (CR) from water, showing high specific surface areas and efficient CR adsorption behavior influenced by factors such as pH, initial concentration, and contact time. The adsorption process followed intra-particle diffusion, pseudo-second-order kinetic, and multi-layer adsorption, with decent magnetic properties for recycling.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Peter Adam, Marius Horvath, Katalin Sinko
Summary: The main aim of this research was to develop a new low-cost synthesis route for producing ultralight Al2O3 cryogel - fiber composite materials for high temperature insulation. The Al2O3 fibers act as the matrix in these composites instead of the typical reinforcement phase. The synthesis of precursor systems involves sol-gel chemistry, with the same starting materials used for both types of porous Al2O3 systems. The composite systems were characterized using various tests and analysis techniques.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Materials Science, Multidisciplinary
Gamze Colak, Gregory Leinders, Remi Delville, Frederic Jutier, Marc Verwerft, Jef Vleugels
Summary: This study assessed the process conditions for fabricating porous uranium oxide microspheres through internal gelation. The effects of calcination temperature and pore-formers were investigated. Starch was found to be an effective pore-former, leading to increased accessible porosity. The infiltration of neodymium nitrate into the microspheres was successful.
JOURNAL OF NUCLEAR MATERIALS
(2022)
Article
Polymer Science
Irina Kononova, Vyacheslav Moshnikov, Pavel Kononov
Summary: Porous nanocomposites using two and three-component systems were created for gas sensors with the sol-gel method. The Langmuir model and the Brunauer-Emmett-Teller theory were used for calculations to understand the physical-chemical processes during gas adsorption. X-ray diffraction, thermogravimetric analysis, and other techniques were used to analyze the interaction between components and determine optimal annealing temperature. Introduction of a semiconductor additive increased the sensitivity of the nanostructured layers to reductional reagent gases.
Article
Nanoscience & Nanotechnology
Anna K. Boehm, Samantha Husmann, Marie Besch, Oliver Janka, Volker Presser, Markus Gallei
Summary: A new method for preparing free-standing films of metal oxides for use as electrodes in Li-ion batteries is reported. This method combines emulsion polymerization and shear-induced monodisperse particle self-assembly. The resulting porous materials have ordered pores and a high specific surface area, and can be converted to metal oxide matrices. Heat treatment under CO2 leads to mixed-TiNb oxide/carbon hybrid materials, with enhanced electrolyte permeation. When tested as Li-ion battery electrodes, the materials showed a specific capacity of 335 mAh.g(-1) at a rate of 10 mA.g(-1) and retained a specific capacity of 191 mAh.g(-1) after 1000 cycles at 250 mA.g(-1).
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Ingrid Rodriguez-Gutierrez, Karen Cristina Bedin, Beatriz Mourino, Joao Batista Souza Junior, Flavio Leandro Souza
Summary: This article provides a critical assessment of hydrothermal and polymeric precursor methods for designing photoelectrodes for future industrial implementation. The main conditions and strategies that can affect the photoelectrochemical performance are highlighted.
Article
Chemistry, Multidisciplinary
Sidra Khalid, Saira Riaz, Samia Naeem, Aseya Akbar, S. Sajjad Hussain, Y. B. Xu, Shahzad Naseem
Summary: A novel approach combining microwave radiations and aluminum doping is proposed to achieve multifunctionality and spin polarization in iron oxide thin films. Control over structural transitions in the thin films is achieved through the combined effect of microwave radiations and Al doping. The transition from gamma-Fe2O3 to Fe3O4 thin films is confirmed at Al concentrations of 6-10 wt%, leading to an increase in saturation magnetization and observation of Verwey transition.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2021)
Article
Chemistry, Physical
Wojciech Guziewicz, Anna Bialas, Bogna D. Napruszewska, Malgorzata Zimowska, Jacek Gurgul
Summary: Aluminum-doped titania samples as supports for copper oxide catalysts showed improved thermal stability and increased specific surface area, leading to a broader temperature window of high catalytic activity. The addition of aluminum also resulted in a shift of the temperature of maximum activity to higher values and reduced nitrous oxide formation.
Article
Chemistry, Physical
Elizaveta Anastasova, Anastasia A. Belyaeva, Sergey A. Tsymbal, Denis A. Vinnik, Vladimir V. Vinogradov
Summary: This study develops a stable magnetite hydrosol and successfully synthesizes materials with different structures by controlling the concentrations and drying conditions. The effects are theoretically explained and the synthesized materials show excellent biocompatibility and hemostatic potential.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Materials Science, Ceramics
Manal Hessien, Eric Prouzet
Summary: Silica has attracted interest for the synthesis of porous silica, particularly Hierarchical Porous Silica (HPS) through nanoemulsion templating and sol-gel. The oil droplets in nanoemulsion act as a pore-forming agent, while the sol-gel method builds the matrix. The microstructure of samples is influenced by both the volume and hydrodynamic diameter of the nanoemulsions.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2021)
Article
Chemistry, Physical
Bin Shen, Xing Xu, Wanmin Liu, Mulan Qin, Weigang Wang
Summary: Surface modification of LiCoO2 with the lithium ionic conductor LiAlSiO4 enhances its electrochemical performance at a high cutoff voltage of 4.55 V, resulting in higher reversible specific capacity and excellent rate capability. This improvement is attributed to the effective stabilization of the surface and bulk structure by LiAlSiO4 coating, making it a promising strategy to enhance the electrochemical performance of high-voltage LiCoO2.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Chemistry, Physical
Nicole Abdou, Philippe Dieudonne-George, Nicolas Brun, Ahmad Mehdi, Peter Hesemann
Summary: This study reports the use of ionic liquids as templates for the formation of mesoporous ionosilica phases. The results show that the nature and quantity of the ionic liquid can efficiently control the texture of ionosilica scaffolds.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)