scholarly journals GISAXS View of Induced Morphological Changes in Nanostructured CeVO4Thin Films

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
Magdy Lučić Lavčević ◽  
Aleksandra Turković ◽  
Pavo Dubček ◽  
Zorica Crnjak Orel ◽  
Bojan Orel ◽  
...  
Keyword(s):  
Morphological Changes ◽  
Sol Gel ◽  
Grazing Incidence ◽  
Real Space ◽  
Electrochemical Cells ◽  
Electrochromic Devices ◽  
Lithium Ions ◽  
Glass Substrates ◽  
X Ray Scattering ◽  
Sol Gel Process

Nanostructured CeVO4films, designed for applications in electrochemical cells and electrochromic devices, were obtained on glass substrates by the sol-gel process. An analysis of morphological modifications in these films, induced by ultrasonication, annealing, and introduction of lithium ions, was performed, using the grazing-incidence small-angle X-ray scattering technique (GISAXS). The GISAXS results are discussed and related with complementary examinations of the same films in real space, performed by scanning electron microscopy on a different length scale.

Transparent semiconductor zinc oxide thin films deposited on glass substrates by sol–gel process

2010 ◽  
Vol 36 (6) ◽  
pp. 1791-1795 ◽  
Author(s):  
Chien-Yie Tsay ◽  
Kai-Shiung Fan ◽  
Yu-Wu Wang ◽  
Chi-Jung Chang ◽  
Yung-Kuan Tseng ◽  
...  
Keyword(s):  
Thin Films ◽  
Zinc Oxide ◽  
Sol Gel ◽  
Oxide Thin Films ◽  
Glass Substrates ◽  
Sol Gel Process ◽  
Transparent Semiconductor

Sol-gel synthesis of biocompatible silica-chitosan hybrids and hydrophobic coatings

2008 ◽  
Vol 23 (8) ◽  
pp. 2053-2060 ◽  
Author(s):  
S. Smitha ◽  
P. Shajesh ◽  
P. Mukundan ◽  
K.G.K. Warrier
Keyword(s):  
Condensation Reaction ◽  
Sol Gel ◽  
Visible Region ◽  
Reaction Medium ◽  
Optical Transmittance ◽  
Hydrophobic Coatings ◽  
Glass Substrates ◽  
Sol Gel Process ◽  
Sol Gel Synthesis

A new organic–inorganic hybrid synthesized through a sol-gel process starting from alkoxysilane and chitosan is reported. Functionalization of the hybrid was effected through in situ hydrolysis–condensation reaction of methyltrimethoxysilane (MTMS) and vinyltrimethoxysilane (VTMS) in the reaction medium. The process yields highly transparent and hydrophobic silica–chitosan hybrids. The hybrid gel was investigated with respect to chemical modification, thermal degradation, hydrophobicity, and transparency under the ultraviolet-visible region. The extent of hydrophobicity had been tailored by varying the precursor ratio. SiO2–chitosan–MTMS hybrids showed a higher thermal stability than SiO2–chitosan–VTMS (SCV) hybrids with respect to hydrophobicity. Condensation of silsesquioxanes generated from the hydrolysis of MTMS and VTMS over the silica-chitosan particles impart hydrophobicity to the hybrid. The coatings of functionalized SiO2–chitosan precursor sol on glass substrates showed nearly 100% optical transmittance in the visible region. The present hybrid material may find application in optics and other industries.

scholarly journals Sol-Gel Coatings for Electrochromic Devices

1992 ◽  
Vol 276 ◽  
Author(s):  
M. A. Macedo ◽  
L. H. Dall'Antonia ◽  
M. A. Aegerter
Keyword(s):  
Heat Treatment ◽  
Sol Gel ◽  
Radiant Energy ◽  
Electrochromic Devices ◽  
Smart Windows ◽  
Ito Glass ◽  
Sol Gel Process ◽  
Ion Storage ◽  
Potential Applications ◽  
Transmission And Reflection

ABSTRACTAll solid state electrochromic smart windows with the configuration glass/ITO/WO3/electrolyte/TiO2-CeO2/ITO/glass have been realized. These devices have potential applications in architectural and automotive fields to regulate the transmission and reflection of the radiant energy. The ion storage electrode TiO2–CeO2 have been realized by sol-gel process and its electrochemical properties are studied as a function of various parameters (thickness, heat treatment, etc.). The electrochemical and optical performances of two cells are reported.

Effect of the Solvent Effect of the Solvent Used During the Preparation of SnO2 Nanoparticulated Methane Sensor

MRS Advances ◽  
2017 ◽  
Vol 2 (49) ◽  
pp. 2701-2706
Author(s):  
Guillermo Carbajal-Franco ◽  
Pedro A. Ortiz-Vázquez ◽  
Alejandro Ávila-García
Keyword(s):  
Gas Sensing ◽  
Sol Gel ◽  
Dip Coating ◽  
Electric Response ◽  
Glass Substrates ◽  
Metallic Oxides ◽  
Sol Gel Process ◽  
Coating Method ◽  
Different Temperatures ◽  
Dip Coating Method

ABSTRACTGas monitoring is a relevant activity for industrial and domestic applications due to usage of dangerous gases as methane, which has been increasingly used as domestic and industrial fuel. In this field of research, metallic oxides such as SnO2, ZnO and Fe2O3 have been widely studied, but we are far from reaching the total understanding of all the parameters that can be varied; in order to improve the gas sensing properties of the metallic oxides. In this work, we present the change of properties derived from using different solvents during the preparation of SnO2 nanoparticles via the sol-gel process. The nanoparticles suspended in two different solvents were deposited on glass substrates by the dip-coating method. The addition of Sb as a dopant was studied at two different Sb:Sn ratios of 1:99 and 1:2. SEM showed differences in the nanostructured topology of the samples and EDS analysis was performed to determine the elemental composition of the samples and the ratios of doping. XRD spectroscopy was used to determine the phase of the materials and the crystallite size. Measurements of the electric response of the coatings to methane, under controlled conditions at different temperatures, were carried out and curves of sensitivity versus temperature were obtained.

Synthesis and photoresponse of rare earth doped phosphosilicates

1997 ◽  
Vol 495 ◽  
Author(s):  
Z. Cao ◽  
B. I. Lee ◽  
W. D. Samuels ◽  
G. J. Exarhos ◽  
L. Wang
Keyword(s):  
Indium Tin Oxide ◽  
Laser Energy ◽  
Sol Gel ◽  
Oxide Glass ◽  
Glass Substrates ◽  
Composition And Structure ◽  
Sol Gel Process ◽  
Tetraethoxy Silane ◽  
Indium Tin Oxide Glass ◽  
Rare Earth Doped

ABSTRACTPhosphate ceramics doped with Sm3+ and Tb3+ ions were synthesized through sol-gel process. Thin films of Tb3+ doped phosphosilicates were fabricated by spin coating of the phosphosilicate sols on SiOx/indium-tin-oxide/glass substrates. The gels synthesized by reaction of P2O5 with tetraethoxy silane (TEOS) were fired in air at a temperature range of 200°C – 900°C. The crystal structure was examined by x-ray diffractometry. Si5O(PO4)6 was the only crystalline phase. The fluorescence spectra of Sm3+ as a function of firing temperature, composition and structure of the matrices were investigated. The intensity of Sm3+ emission increased with increasing firing temperatures and greater proportion of phosphorus. The photocurrent of the films at 355 nm laser excitation was observed. The photoresponse as a function of laser energy was linear and showed no sign of saturation. The films exhibited stable photoresponse under a high number of laser shots.

In Situ SAXS Analysis of Interfacial Wetting on Nanorough Surfaces

2012 ◽  
Vol 65 (3) ◽  
pp. 254 ◽  
Author(s):  
Jacky K. L. Cho ◽  
Lauren A. Palmer ◽  
Alex H.-F. Wu ◽  
Irving I. Liaw ◽  
David Cookson ◽  
...  
Keyword(s):  
Sol Gel ◽  
Sodium Dodecyl ◽  
Sliding Angle ◽  
X Ray ◽  
Hierarchical Roughness ◽  
X Ray Scattering ◽  
Sol Gel Process ◽  
Entrapped Air ◽  
Saxs Analysis

Superhydrophobic surfaces were fabricated through a nanoparticle sol-gel process in the presence of a mono-disperse latex particle. By varying precursor nanoparticle size, surfaces of varying degrees of nanoroughness but controlled macro-roughness were produced, all of which exhibited superhydrophobic properties (θwater >160°, sliding angle <10°). These were immersed in water and studied in situ using synchrotron small angle X-ray scattering where the percentage interface under wetting (in contact with liquid) was directly quantified and found to agree well with traditional Cassie equations. Wetting studies in sodium dodecyl sulphate solutions of decreasing surface tension highlighting surfaces of increased hierarchical roughness (pseudo-fractal dimension ~2.5) contained significant quantity of entrapped air even at fluid surface tensions down to 37 mN m–1.

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