TiO 2 /SiO 2 /ORMOSIL hybrid material planar waveguides prepared at low-temperature by sol-gel processing

1999 ◽  
Author(s):  
Wenxiu Que ◽  
Yan Zhou ◽  
Yee Loy Lam ◽  
Yuen Chuen Chan ◽  
Shi De Cheng ◽  
...  
Keyword(s):  
Low Temperature ◽  
Hybrid Material ◽  
Sol Gel ◽  
Planar Waveguides ◽  
Gel Processing

scholarly journals Hydrophobic silica thin films by sol-gel processing and spin coating technique at low temperature

2014 ◽  
Vol 8 (1) ◽  
Author(s):  
Nurul Huda Abu Bakar ◽  
Karim Deraman ◽  
R. Hussin ◽  
W. Nurulhuda W. Shamsuri ◽  
Faizal Mansor ◽  
...  
Keyword(s):  
Thin Films ◽  
Low Temperature ◽  
Spin Coating ◽  
Sol Gel ◽  
Contact Angles ◽  
Spin Coating Technique ◽  
Coating Technique ◽  
Hydrophobic Silica ◽  
Silica Thin Films ◽  
Gel Processing

Hydrophobic silica thin films were prepared by sol-gel processing and self-assembly by chemical vapor reaction with Trimethylchlorosilane (TMCS) at low temperature. The sols were divided into Sol A with ethanol, Polyethylene glycol (PEG) and water (H2O) while Sol B were contain precursor of silica Tetraethylorthosilicate (TEOS) hydrolyze with ethanol which was stirred for 15 minutes. HCl was added into the mixture and stirred for another 10 minutes. After deposition on 1 x 1 cm corning glass using spin coating technique (two-step timer), the films were heated at 60˚C for 10 minutes and finally annealed at 150°C for 1 hour. The films were characterized by using Rudolph/Auto EL Ellipsometer, Shimadzu Spectrophotometer, Perkin Elmer Fourier Transform Infrared (FTIR) and Atomic Force Microscope (AFM). The results showed that the films thickness and refractive index were in the range of 105.2 to 112.4 nm and 1.35 to 1.38, respectively. The films were transmitted 70-80% of light (in visible range) with various bondings of C-H, Si-O-Si, Si-C and Si-OH. Surface roughness of the films was increased from 30.6 nm (silica thin film) to 140.5 nm (hydrophobic silica thin films) after modification have been done on the films by using TMCS (heated at 40˚C). It was found that the water contact angles increased when time of reaction increased from 109° to 124°.

Low-temperature synthesis of ZrB2 nano-powders using a sorbitol modified sol–gel processing route

2014 ◽  
Vol 25 (3) ◽  
pp. 910-915 ◽  
Author(s):  
Huiming Ji ◽  
Ming Yang ◽  
Minmin Li ◽  
Guangyi Ji ◽  
Hongna Fan ◽  
...  
Keyword(s):  
Low Temperature ◽  
Sol Gel ◽  
Processing Route ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
Gel Processing

Photo-induced sol–gel processing for low-temperature fabrication of high-performance silsesquioxane membranes for use in molecular separation

2015 ◽  
Vol 51 (49) ◽  
pp. 9932-9935 ◽  
Author(s):  
Mai Nishibayashi ◽  
Hiroyuki Yoshida ◽  
Masamoto Uenishi ◽  
Masakoto Kanezashi ◽  
Hiroki Nagasawa ◽  
...  
Keyword(s):  
Low Temperature ◽  
High Performance ◽  
Sol Gel ◽  
Molecular Separation ◽  
Gel Processing

Silsesquioxane (SQ) membranes derived from 3-methacryloxypropyltrimethoxysilane and bis(trimethoxysilyl)ethane were successfully fabricated at low temperature via photo-induced sol–gel processing.

The Chemical Processing of Silicates for Biological Applications - A Review

1990 ◽  
Vol 180 ◽  
Author(s):  
L. L. Hench ◽  
June Wilson
Keyword(s):  
Low Temperature ◽  
Sol Gel ◽  
Clinical Applications ◽  
Chemical Processing ◽  
Biological Applications ◽  
Application Area ◽  
Processing Methods ◽  
Bioactive Materials ◽  
Gel Processing ◽  
Glass Powders

ABSTRACTA new application area for sol-gel processing biomaterials and implant devices, is presented. The concepts of bioactive fixation of implants is reviewed. Conventional processing methods for bioactive materials are compared with low temperature chemical processing. Advantages of sol-gel processing include new bioactive compositional ranges of ultraporous CaO-P2O5-SiO2 biogel-glass powders. Clinical applications of bioactive implants are discussed.

Issues in the Energetics of Metastable Oxides and Oxyhydroxides

1996 ◽  
Vol 432 ◽  
Author(s):  
Alexandra Navrotsky
Keyword(s):  
Low Temperature ◽  
Manganese Oxides ◽  
Sol Gel ◽  
Stable Phase ◽  
Gamma Alumina ◽  
Materials Synthesis ◽  
Crystalline Materials ◽  
Hydrothermal Reactions ◽  
Calorimetric Studies ◽  
Gel Processing

AbstractIn both low temperature materials synthesis (sol gel processing, chimie douce) and low temperature geochemistry (weathering, geothermal and hydrothermal reactions, diagenesis) metastable and/or poorly crystalline materials are encountered. Despite the lack of equilibrium, energetic considerations play a major role in the formation and transformation of such phases. Recent calorimetric studies on heats of formation of zeolites and related metastable frameworks, on nanophase alpha and gamma alumina, and on manganese oxides and hydroxides are summarized. These studies illustrate the effects of framework topology, cation content, hydration and surface energy on the formation, persistence, and eventual transformation to more stable phase assemblages of these environmentally important materials.

TiO2-Ag Nanocomposites by Low-Temperature Sol-Gel Processing

2010 ◽  
Vol 93 (2) ◽  
pp. 445-449 ◽  
Author(s):  
Hong Li ◽  
Gaoling Zhao ◽  
Zhijun Chen ◽  
Bin Song ◽  
Gaorong Han
Keyword(s):  
Low Temperature ◽  
Sol Gel ◽  
Gel Processing
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