Showing papers on "Sol-gel published in 2022"
TL;DR: In this article, the structure, properties and morphology of the SnO2/SiO2 nanocomposites were determined by HRTEM, SEM, XPS FTIR and XRD characterization.
24 citations
TL;DR: In this paper , the authors used sol-gel technology to synthesize pure ZnO and Rb-doped ZnOs nanoparticles, RbxZn1-xO-NPs.
Abstract: This article is dedicated to synthesizing pure ZnO and Rb-doped ZnO nanoparticles, RbxZn1-xO-NPs (x=0.0, 0.02, 0.04, 0.06 mol) using sol-gel technology. Synthesized samples have been characterized and studied utilizing X-ray...
22 citations
TL;DR: In this paper , the structure, properties and morphology of the SnO2/SiO2 nanocomposites were determined by HRTEM, SEM, XPS FTIR and XRD characterization.
21 citations
TL;DR: In this article , the main chemical processes used in the fabrication of CZO thin films with special focus on the sol-gel synthesis involving several chemical and physical parameters such as solvent, additive, solution stirring and aging time, substrate and coating method which includes both dip and spin coating.
19 citations
TL;DR: In this article , Zirconium carbide nanopowders were synthesized by the sol-gel method in the alcoholic system, and the impact of pH and temperature parameters on the synthesis process of these nanoparticles was evaluated.
17 citations
TL;DR: In this article , Ni-doped Al2O3 nanocomposite ceramic coatings were produced on Cp-Ti samples at two different rotational speeds by the spin coating process, which is a sol-gel method.
Abstract: Cp-Ti is frequently used in biomedical applications because of its good corrosion and high biocompatible properties. However, its poor wear resistance limits its use in some applications. Therefore, this study aims to improve its wear and corrosion resistance by producing Ni-doped Al2O3 nanocomposite coatings on Cp-Ti. In order to achieve this goal, undoped Al2O3 and Ni-doped Al2O3 nanocomposite ceramic coatings were produced on Cp-Ti samples at two different rotational speeds by the spin coating process, which is a sol-gel method. Afterward, their structural and morphological features were examined by XRD, SEM, Raman, and 3D surface profilometer. Reciprocating wear tests and electrochemical investigations were performed to determine their wear and corrosion properties.
15 citations
TL;DR: In this paper, the authors synthesize polyacrylic coatings from 3-(trimethoxysilyl)propyl methacrylate, different acrylate derivatives and tetraethyl orthosilicate.
14 citations
TL;DR: In this article , the effect of doping with Cd and 1, 2 and 3 wt % Na on the structural, morphological, optical and UV detection properties of the nanostructured ZnO thin films was investigated.
14 citations
TL;DR: The sol-gel method is a simple and low-cost technique that requires low temperature for the reaction process as mentioned in this paper , which has been used in a variety of applications, including corrosion prevention, biomedical applications, and electronic devices.
13 citations
TL;DR: In this article, the prepared tin oxide thin films were polycrystalline in nature and crystallizes with tetragonal rutile structure with average crystallite size ranges from 4.39nm-11.47nm.
Abstract: Undoped and cobalt doped tin oxide thin films were successfully synthesized by using the sol-gel spin coating technique and post annealed at 600 °C. XRD analysis reveals that all the prepared tin oxide thin films were polycrystalline in nature and crystallizes with tetragonal rutile structure with average crystallite size ranges from 4.39 nm–11.47 nm. SEM analysis shows that the nano sized particles were uniformly dispersed in the prepared thin films. The elemental composition was found out by using EDAX analysis and found that the tin oxide thin films contain Co, Sn and oxygen. The optical band gap values were calculated using Tauc plot and are ranging from 2.28 eV–3.40 eV. FTIR analysis shows that the prepared thin films contain Sn–O–Sn, Sn–O, H–O–H, C–O and Sn–OH vibrations. Electrical studies reveal that the resistivity of all the films was very low and are ranging from 1.1556 × 10−3 Ω-m - 1.7642 × 10−3 Ω-m.
13 citations
27 Jan 2022
TL;DR: In this article , the sol-gel process was optimized and used to deposit a hydroxyapatite layer on Ti6Al4V, and the results of structural and thermal analysis have determined the optimal preparation parameters to produce monophasic and crystalline hydroxypatite.
Abstract: Sol–gel derived hydroxyapatite coatings on metallic implants are important to promote their osseointegration and biocompatibility. However, such coatings generally suffer from drawbacks that limit implant longevity. In this study, the sol gel process to prepare hydroxyapatite was optimized and used to deposit a hydroxyapatite layer on Ti6Al4V. Samples were pretreated by thermal oxidation, sol–gel coating, and anodization to produce titanium dioxide interlayers with various structures. The results of structural and thermal analysis have determined the optimal preparation parameters to produce monophasic and crystalline hydroxyapatite. The introduction of titanium dioxide intermediate layers produced crack-free hydroxyapatite films and promoted the adherence and integrity of the coating, where the adhesive strength was remarkably improved. Furthermore, potentiodynamic polarization tests in simulated body fluid revealed low corrosion rates and high protection property of the hydroxyapatite/titania coated samples, making these structures promising for the coatings of bone replacements. Graphical abstract
TL;DR: In this article , a series of novel polyamide (PA)/silica (PA/SiO2) composites were prepared via in-situ benzoxazine-isocyanide chemistry combined with a sol-gel process under mild conditions (under 30 °C and ambient pressure).
TL;DR: In this article , the sol-gel process was used to manufacture zinc-doped magnesium oxide nano-flakes, which were then distributed in chitosan solution to create a nanocomposite thin layer over a glassy carbon electrode (GCE), which acts as a binder that provides strength and prevents the material on GCE from leaching out.
TL;DR: In this paper, a sol-gel-flux method (SGFM) was applied to synthesize ZrO2 (1Y6Ce-ZrO 2) nanoparticles (NPs) stabilised by 1/mol% Y2O3 and 6 /mol% CeO2.
TL;DR: In this paper , the synthesis and application of hybrid sol-gel materials obtained by encapsulation of microorganism cells in an inorganic matrix based on silicon, aluminum, and transition metals were analyzed in detail.
Abstract: Microorganism-cell-based biohybrid materials have attracted considerable attention over the last several decades. They are applied in a broad spectrum of areas, such as nanotechnologies, environmental biotechnology, biomedicine, synthetic chemistry, and bioelectronics. Sol-gel technology allows us to obtain a wide range of high-purity materials from nanopowders to thin-film coatings with high efficiency and low cost, which makes it one of the preferred techniques for creating organic-inorganic matrices for biocomponent immobilization. This review focuses on the synthesis and application of hybrid sol-gel materials obtained by encapsulation of microorganism cells in an inorganic matrix based on silicon, aluminum, and transition metals. The type of immobilized cells, precursors used, types of nanomaterials obtained, and their practical applications were analyzed in detail. In addition, techniques for increasing the microorganism effective time of functioning and the possibility of using sol-gel hybrid materials in catalysis are discussed.
TL;DR: In this paper , a robust, scalable cost-effective sol-gel route to obtain a durable super-hydrophobic coating was introduced, which included Tetraethyl orthosilicate and Methyltriethoxysilane as sol matrix, Triethoxyoctylsilane as a low surface energy precursor, and fumed silica nanoparticles for roughness formation.
TL;DR: In this article, a series of novel polyamide (PA)/silica (PA/SiO2) composites were prepared via in-situ benzoxazine-isocyanide chemistry combined with a sol-gel process (BIC/sol-gel) under mild conditions (under 30°C and ambient pressure).
TL;DR: In this paper , lignin was gasified in supercritical water with catalysis of CuO-ZnO synthesized by deposition precipitation, co-precipitation and sol-gel methods.
TL;DR: In this article , the sol-gel synthesis of bioactive glass nanoparticles containing both boron and copper oxides was reported for the first time in the literature, and two acid/base co-catalysed methods were compared.
TL;DR: In this article , the prepared tin oxide thin films were polycrystalline in nature and crystallizes with tetragonal rutile structure with average crystallite size ranges from 4.39 nm-11.47 nm.
Abstract: Undoped and cobalt doped tin oxide thin films were successfully synthesized by using the sol-gel spin coating technique and post annealed at 600 °C. XRD analysis reveals that all the prepared tin oxide thin films were polycrystalline in nature and crystallizes with tetragonal rutile structure with average crystallite size ranges from 4.39 nm–11.47 nm. SEM analysis shows that the nano sized particles were uniformly dispersed in the prepared thin films. The elemental composition was found out by using EDAX analysis and found that the tin oxide thin films contain Co, Sn and oxygen. The optical band gap values were calculated using Tauc plot and are ranging from 2.28 eV–3.40 eV. FTIR analysis shows that the prepared thin films contain Sn–O–Sn, Sn–O, H–O–H, C–O and Sn–OH vibrations. Electrical studies reveal that the resistivity of all the films was very low and are ranging from 1.1556 × 10−3 Ω-m - 1.7642 × 10−3 Ω-m.
01 Apr 2022
TL;DR: In this article , the effect of the calcination temperature on the phase compositions and micromorphologies of the as-prepared 12Ce-ZrO2 products was investigated.
Abstract: ZrO2 nanoparticles (NPs) stabilised by 12 mol% CeO2 (12Ce-ZrO2) with high sintering ability were prepared using a novel sol-gel-flux method (SGFM) for the first time, where NaCl flux was introduced into a citric acid-based sol-gel system. The microstructure and sintering performances of the as-prepared NPs were compared with those of the product synthesised using the traditional citric acid-based sol-gel method (SGM). The effect of the calcination temperature on the phase compositions and micromorphologies of the as-prepared 12Ce-ZrO2 products was investigated. The results showed that the optimum calcination temperature for the SGFM was 800 °C, and the corresponding 12Ce-ZrO2 product (SGFM-800) was composed of well-dispersed 20–40 nm t-ZrO2 NPs with homogenous micromorphology, while the 12Ce-ZrO2 NPs synthesised using the SGM (SGM-800) were severely agglomerated. The SGM-800 NPs could not be fully densified up to the sintering temperature of 1450 °C owing to severe agglomeration. However, the SGFM-800 NPs exhibited good sintering ability, and a relative density of 99.67 % could be achieved at 1150 °C for 4 h. The fully dense 12Ce-TZP ceramics prepared with SGFM-800 had an average grain size of 0.46 μm. To the best of our knowledge, such a fine grain size has not been reported to date for 12Ce-TZP ceramics obtained by single-step pressless sintering.
TL;DR: In this paper, photocatalytic hybrid nanocomposite films that are highly transparent and do not have color changes and that also exhibit high photocatalysis activitiy were acquired.
TL;DR: In this paper, a series of Ga-Ba co-doping LLZO samples were synthesized through sol-gel method to investigate the effects of Ba content on phase, morphology and ionic conduction in ceramics.
TL;DR: In this paper, an easy one-pot sol-gel recipe assisted by glycerol in an acid medium was used to create e-Fe2O3 nanoparticles with a size of a few nanometers and reached the highest purity after a densification treatment at 960°C.
TL;DR: In this paper , the synthesis of TiO 2 nanopowders using the precursor of titanium tetraiso-propoxide (TTIP) by the sol-gel method is described.
TL;DR: In this paper , the use of trichloroacetic acid (TCA) as fuel to create new types of time-controlled materials switching reversibly from a gel to a solution (gel-sol-gel cycle).
Abstract: Smart materials reversibly changing properties in response to a stimuli are promising for a broad array of applications. In this article, we report the use of trichloroacetic acid (TCA) as fuel to create new types of time-controlled materials switching reversibly from a gel to a solution (gel-sol-gel cycle). Applying various neutral amines as organogelators, TCA addition induces amine protonation, switching the system to a solution, while TCA decarboxylation over time enables a return to the initial gel state. Consequently, the newly obtained materials possess interesting time-dependent properties applied in the generation of remoldable objects, as an erasing ink, as chiroptical switches, or for the generation of new types of electrical systems.
TL;DR: In this paper , the structural and compositional evolution of Epsilon iron oxide (ε-Fe 2 O 3 ) coatings on Si(100) substrates is studied by confocal Raman microscopy and X-ray absorption spectroscopy techniques.
TL;DR: In this article , photocatalytic hybrid nanocomposite films that are highly transparent and do not have color changes and that also exhibit high photocatalysis activitiy were acquired.