ChemInform Abstract: Insulating Ultrathin Silica Films Formed by a Room-Temperature Sol-Gel Process.

ChemInform ◽  
2010 ◽  
Vol 32 (34) ◽  
pp. no-no
Author(s):  
Joseph W. Robertson ◽  
Mei Cai ◽  
Jeanne E. Pemberton
Keyword(s):  
Room Temperature ◽  
Sol Gel ◽  
Silica Films ◽  
Sol Gel Process

Effect of Annealing temperature on the Structural and Magnetic Properties of TbxY3-xFe5O12(x = 0.0, 1.0, 2.0) Thin Films Prepared by Sol-Gel Process

2012 ◽  
Vol 501 ◽  
pp. 236-241 ◽  
Author(s):  
Ftema W. Aldbea ◽  
Noor Bahyah Ibrahim ◽  
Mustafa Hj. Abdullah ◽  
Ramadan E. Shaiboub
Keyword(s):  
Thin Films ◽  
Magnetic Properties ◽  
Room Temperature ◽  
Annealing Temperature ◽  
Sol Gel ◽  
Vibrating Sample Magnetometer ◽  
X Ray ◽  
Garnet Phase ◽  
Sol Gel Process ◽  
Amorphous Structures

Thin films nanoparticles TbxY3-xFe5O12 (x=0.0, 1.0, 2.0) were prepared by the sol-gel process followed by annealing process at various annealing temperatures of 700° C, 800° C and 900° C in air for 2 h. The results obtained from X-ray diffractometer (XRD) show that the films annealed below 900°C exhibit peaks of garnet mixed with small amounts of YFeO3 and Fe2O3. Pure garnet phase has been detected in the films annealed at 900°C. Before annealing the films show amorphous structures. The particles sizes measurement using the field emission scanning electron microscope (FE-SEM) showed that the particles sizes increased as the annealing temperature increased. The magnetic properties were measured at room temperature using the vibrating sample magnetometer (VSM). The saturation magnetization (Ms) of the films also increased with the annealing temperature. However, different behavior of coercivity (Hc) has been observed as the annealing temperature was increased.

Nanostructured Doped Silica Films Application as Sensitive Layers for Chemical Sensors

2013 ◽  
Vol 684 ◽  
pp. 7-11
Author(s):  
Sergey Krutovertsev ◽  
Alla Tarasova ◽  
Olga Ivanova ◽  
Larisa Krutovertseva
Keyword(s):  
Initial Conditions ◽  
Sol Gel ◽  
Silica Films ◽  
Adsorption Activity ◽  
Developed Surface ◽  
Sol Gel Process ◽  
Sensitive Characteristics ◽  
The Right ◽  
Kinetics Of ◽  
Matrix Factors

The sensor behavior of nanostructured doped silica films produced by sol-gel way were examined. Hygroscopic substances and polyoxometalates were used as additives to make more significant sensitive characteristics of initial matrix. Factors that have effect on sol preparation and films forming were investigated. Adsorption activity of the sensitive films was studied and it was shown that the films had a highly developed surface with nano-size pores. Change of initial conditions of sol-gel process gives opportunity to influence on kinetics of gel formation and consequently, on structure and properties of final materials. The study showed that the conditions of the environment affected the sensors characteristics markedly, which can be improved by choosing of the right procedure of forming and treatment. Influence of type and additive substances quantity into doped films was discussed in the paper

Sol-gel process of non-linear optical silica films with organic chromophore as side chain

1996 ◽  
Vol 31 (9) ◽  
pp. 2443-2446 ◽  
Author(s):  
Po-Hou Sung ◽  
Shao-Ling Wu ◽  
Chien-Yang Lin
Keyword(s):  
Sol Gel ◽  
Side Chain ◽  
Silica Films ◽  
Sol Gel Process ◽  
Non Linear ◽  
Linear Optical ◽  
Organic Chromophore

Indium oxide octahedrons based on sol–gel process enhance room temperature gas sensing performance

2015 ◽  
Vol 637 ◽  
pp. 55-61 ◽  
Author(s):  
Xiaohui Mu ◽  
Changlong Chen ◽  
Liuyuan Han ◽  
Baiqi Shao ◽  
Yuling Wei ◽  
...  
Keyword(s):  
Indium Oxide ◽  
Room Temperature ◽  
Gas Sensing ◽  
Sol Gel ◽  
Sol Gel Process ◽  
Sensing Performance

Textural characterization of porous silica films prepared by the sol–gel process

2004 ◽  
pp. 227-231
Author(s):  
G. L. T. Nascimento ◽  
L. M. Seara ◽  
B. R. A. Neves ◽  
N. D. S. Mohallem
Keyword(s):  
Sol Gel ◽  
Porous Silica ◽  
Silica Films ◽  
Textural Characterization ◽  
Sol Gel Process

Evaluations of Hydrogen Permeation on γ-Al2O3 Synthesized by Sol-Gel Process

2009 ◽  
Vol 620-622 ◽  
pp. 25-28
Author(s):  
Ji Hee Park ◽  
Mie Won Jung ◽  
Tae Whan Hong
Keyword(s):  
Room Temperature ◽  
Ceramic Membrane ◽  
Hydrogen Permeation ◽  
Thermal Evolution ◽  
Sol Gel ◽  
Alumina Ceramic ◽  
Distilled Water ◽  
Ceramic Support ◽  
Sol Gel Process ◽  
Metal Ceramic

The purpose of this work was hydrogen permeation of ceramic or metal/ceramic membrane using γ-Al2O3 by synthesizing. The γ-Al2O3 was synthesized by using the sol-gel process with aluminum isopropoxide and primary distilled water as the precursor and solvent. The γ-Al2O3-based membranes were prepared using HPS. The phase transformation, thermal evolution, surface are and morphology of γ-Al2O3 and γ-Al2O3-based membranes were characterized by XRD, TG-DTA, BET and FE-SEM. The hydrogen permeation of γ-Al2O3-based membranes was examined at room temperature comparing with other paper using nickel composited membrane on alumina ceramic support.

Study on the Dielectric Properties of Hybrid and Porous Polyimide-Silica Films

2008 ◽  
Vol 47-50 ◽  
pp. 973-976 ◽  
Author(s):  
Yi He Zhang ◽  
Qing Song Su ◽  
Li Yu ◽  
Hong Zheng ◽  
Hai Tao Huang ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Sol Gel ◽  
Silica Particles ◽  
Low Dielectric Constant ◽  
Hybrid Films ◽  
Porous Films ◽  
Silica Films ◽  
Low Dielectric ◽  
Dimethyl Acetamide ◽  
Sol Gel Process

A sol-gel process was used to prepare polyimide-silica hybrid films from the polyimide precursors and TEOS in N,N- dimethyl acetamide, then the hybrid film was treated with hydrofluoric acid to remove the dispersed silica particles, leaving pores with diameters between 80nm to 1µm, depending on the size of silica particles. The structure and dielectric constant of the hybrid and porous films were characterized by FTIR,SEM. The porous films displayed relatively low dielectric constant compared to the hybrid polyimide-silica films.

Structure, room-temperature magnetic and optical properties of Mn-doped TiO 2 nano powders prepared by the sol—gel process

2010 ◽  
Vol 19 (11) ◽  
pp. 118102 ◽  
Author(s):  
Peng Ding ◽  
Fa-Min Liu ◽  
Chuang-Cang Zhou ◽  
Wen-Wu Zhong ◽  
Huan Zhang ◽  
...  
Keyword(s):  
Optical Properties ◽  
Room Temperature ◽  
Sol Gel ◽  
Sol Gel Process ◽  
Mn Doped
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