Structure and Properties of Vanadium Pentoxide Gels

1984 ◽  
Vol 32 ◽  
Author(s):  
J. Livage
Keyword(s):  
Sol Gel ◽  
Host Lattice ◽  
Proton Conductors ◽  
Thin Layers ◽  
Structure And Properties ◽  
Fast Proton ◽  
New Developments ◽  
Semiconducting Properties ◽  
Sol Gel Process ◽  
Polycondensation Process

ABSTRACTTransition metal oxide gels can be obtained, through a polycondensation process, by acidification of aqueous solutions. Thin layers can be easily deposited onto a substrate. Their electronic and ionic properties could lead to new developments of the sol-gel process. The semiconducting properties of V2O gels can be used for antistatic coatings or electrical switching devices. These gels exhibit a lamellar structure and can be described as particle hydrates. They are fast proton conductors and could behave as a host lattice for intercalation.

Structure and properties of PZT thick films prepared by a modified sol-gel process

2001 ◽  
Vol 260 (1) ◽  
pp. 231-236 ◽  
Author(s):  
Qifa Zhou ◽  
Qingqi Zhang ◽  
Helen Lai Wah Chan ◽  
Chung Loong Choy
Keyword(s):  
Thick Films ◽  
Sol Gel ◽  
Structure And Properties ◽  
Sol Gel Process

Electrical Properties of beta-LixV2O5 Thin Layers Prepared by the Sol-Gel Process

1994 ◽  
Vol 77 (4) ◽  
pp. 891-896 ◽  
Author(s):  
Seung-Young Bae ◽  
Masaru Miyayama ◽  
Hiroaki Yanagida
Keyword(s):  
Electrical Properties ◽  
Sol Gel ◽  
Thin Layers ◽  
Sol Gel Process

Generation of amorphous ceramic capacitor coatings on titanium using a continuous sol-gel process

1995 ◽  
Vol 10 (10) ◽  
pp. 2626-2630 ◽  
Author(s):  
Brian G. Dixon ◽  
Myles A. Walsh ◽  
Peter G. Phillips ◽  
R. Scott Morris
Keyword(s):  
Electrical Properties ◽  
Sol Gel ◽  
Thin Layers ◽  
Amorphous Films ◽  
Zinc Oxides ◽  
Sol Gel Process ◽  
Ceramic Capacitor ◽  
Amorphous Nature ◽  
Titanium Wire ◽  
Computer Controlled

Thin amorphous films of ceramic capacitor materials were successfully deposited using sol-gel chemistry onto titanium wire using a continuous, computer-controlled process. By repeatedly depositing and calcining very thin layers of material, smooth and even coats can be produced. Surface analyses revealed the layered nature of these thin coats, as well as the amorphous nature of the ceramic. The electrical properties of the better coatings, all composed of niobrium, bismuth, and zinc oxides, were then evaluated.

Photoluminescence Characteristics of Sol–Gel Derived ZnTiO3 Doped with Ni2+ Ion

2013 ◽  
Vol 544 ◽  
pp. 360-363 ◽  
Author(s):  
You Hua Yu ◽  
Meng Xia ◽  
Li Li Liu ◽  
Wei Jie Wu
Keyword(s):  
Sol Gel ◽  
Luminescent Properties ◽  
Host Lattice ◽  
Deionized Water ◽  
Luminescence Spectra ◽  
X Ray Diffraction ◽  
Spectra Analysis ◽  
X Ray ◽  
Water As Solvent ◽  
Sol Gel Process

ZnTiO3 doped with Ni 2+ ion has been prepared at a relatively low temperature of 600°C from the precursor derived from sol-gel process using deionized water as solvent. X-ray diffraction analysis indicates that the doped samples exhibit a hexagonal ZnTiO3 structure. From the luminescence spectra analysis, the introduction of Ni2+ ions into ZnTiO3 results in novel luminescent properties. And the relative intensity of the bands varies with the concentration of Ni2+ ions. It is demonstrated that the Ni2+ ion has taken the place of Zn2+ ion in the host lattice of ZnTiO3.

Structure and properties of BaFe12O19 coated fly ash cenospheres by sol-gel process

2006 ◽  
Vol 21 (3) ◽  
pp. 129-131 ◽  
Author(s):  
Zeng Aixiang ◽  
Xiong Weihao ◽  
Wang Caifang ◽  
Zhou Qionghua
Keyword(s):  
Fly Ash ◽  
Sol Gel ◽  
Structure And Properties ◽  
Sol Gel Process ◽  
Fly Ash Cenospheres

scholarly journals Rate-Limiting Steps of Dye Degradation over Titania-Silica Core-Shell Photocatalysts

Catalysts ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 583 ◽  
Author(s):  
Ariane Giesriegl ◽  
Jakob Blaschke ◽  
Shaghayegh Naghdi ◽  
Dominik Eder
Keyword(s):  
Dye Degradation ◽  
Sol Gel ◽  
Dye Adsorption ◽  
Thin Layers ◽  
Continuous Change ◽  
Uv Illumination ◽  
Rate Limiting Step ◽  
Sol Gel Process ◽  
Rate Limiting ◽  
Positively Charged

In this work, we employed a step-by-step sol-gel process to controllably deposit ultra-thin layers of SiO2 on anatase nanoparticles in the range between 0 and 1 nm. The deposition was confirmed by TEM, EDX, and ATR-FTIR (e.g., Ti-O-Si band at 960 cm-1). Zeta potential measurements unravelled a continuous change in surface charge density with increasing silica shell thickness. The photocatalysts were evaluated towards adsorption and degradation of positively-charged and negatively-charged dyes (methylene blue, methyl orange) under UV illumination. The growth mechanism follows the Stranski–Krastanov model with three thickness regimes: (a) Flat islands (first step), (b) mono/bilayers (second/third step), and (c) regular thick films (fourth/fifth step). The results suggest different rate limiting processes for these regimes: (a) For the thinnest scenario, acidic triple-phase boundaries (TPBs) increase the activity for both dyes with their accessibility being the rate limiting step; (b) for continuous mono/bilayers, dye adsorption on the negatively-charged SiO2 shells becomes the rate liming step, which leads to a stark increase in activity for the positively-charged MB and a decrease for MO; (c) for thicker shells, the activity decreases for both dyes and is limited by the charge transport through the isolating shells.

scholarly journals A Brief Review on the Use of Chelation Agents in Sol-gel Synthesis with Emphasis on β-Diketones and β-Ketoesters

2019 ◽  
Vol 33 (3) ◽  
pp. 295-301 ◽  
Author(s):  
Sanislav Kurajica
Keyword(s):  
Ethyl Acetoacetate ◽  
Sol Gel ◽  
Chelating Agent ◽  
Short Review ◽  
Metal Alkoxides ◽  
Structure And Properties ◽  
Gel Structure ◽  
Sol Gel Process ◽  
Rapid Hydrolysis ◽  
Sol Gel Synthesis

Metal alkoxides are the most commonly used sol-gel process precursors. Most<br /> alkoxides show excessive reactivity towards water. That leads to rapid hydrolysis, metal<br /> hydroxide formation, and immediate precipitation. The reactivity of alkoxides can be<br /> reduced by modification with chelation agents. Chelation influences the gelation process,<br /> which is reflected in gel structure and properties of the final material. In this short review,<br /> the chelation process, the oligomerization phenomena, and the influence of the chelating agent on the gel structure are discussed. Peculiarities of the use of FTIR and NMR, as methods particularly suitable for the investigation of chelation process, are described taking ethyl acetoacetate as an example.

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