Influence of non-hydrolyzable groups in silane precursor on pore dimension and photochromic properties of sol-gel silica embedded with a spirooxazine dye

2015 ◽  
Vol 16 (11) ◽  
pp. 2318-2324 ◽  
Author(s):  
Marzieh Parhizkar ◽  
Yan Zhao ◽  
Zhiguang Xu ◽  
Adrian Gestos ◽  
Zongli Xie ◽  
...  
Keyword(s):  
Sol Gel ◽  
Photochromic Properties ◽  
Pore Dimension ◽  
Silane Precursor

Hybrid spiropyran–silica nanoparticles with a core-shell structure: sol–gel synthesis and photochromic properties

2010 ◽  
Vol 20 (42) ◽  
pp. 9370 ◽  
Author(s):  
Joachim Allouche ◽  
Aurélie Le Beulze ◽  
Jean-Charles Dupin ◽  
Jean-Bernard Ledeuil ◽  
Sylvie Blanc ◽  
...  
Keyword(s):  
Silica Nanoparticles ◽  
Shell Structure ◽  
Sol Gel ◽  
Core Shell ◽  
Photochromic Properties ◽  
Core Shell Structure ◽  
Sol Gel Synthesis

Transmission Electron Microscopy Characterization and Application of Sol-Gel Membranes

1999 ◽  
Vol 5 (6) ◽  
pp. 445-451 ◽  
Author(s):  
Yizhu Guo ◽  
Sandra Gonzalez ◽  
Ana R. Guadalupe
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Sol Gel ◽  
Dimethyl Formamide ◽  
Supported Membranes ◽  
Transmission Electron ◽  
Transmission Electron Microscopy Characterization ◽  
Silane Precursor ◽  
Gel Membranes ◽  
Microscopy Characterization

Abstract: Using standard square mesh grids as supports, we have prepared sol-gel membranes from a functionalized silane precursor, bis[3-(triethoxysilyl)propyl]tetrasulfide in various organic solvents. These mesh-supported membranes allow direct characterization of their microstructure and morphology by transmission electron microscopy (TEM). Homogeneous membranes without prominent microstructural features (or featureless) at nanometer scale were obtained from dimethyl formamide (DMF), isopropanol, and butanol solutions. However, highly porous membranes were produced from DMF and ethylene glycol binary system. Heterogeneous membranes filled with nanoparticles were formed from dimethyl sulfoxide solution. The featureless sol-gel membranes with tunable performances provide a useful alternative as supporting films for TEM applications.

Influence of the alkyl-substituted silane precursor on sol–gel encapsulated lipase activity

2004 ◽  
Vol 29 (1-6) ◽  
pp. 69-79 ◽  
Author(s):  
Cleide M.F Soares ◽  
Onélia A dos Santos ◽  
José E Olivo ◽  
Heizir F de Castro ◽  
Flavio F de Moraes ◽  
...  
Keyword(s):  
Lipase Activity ◽  
Sol Gel ◽  
Silane Precursor

Effect of citric acid on structure and photochromic properties of WO3–TiO2–ZnO composite films prepared by a sol–gel method

2015 ◽  
Vol 41 (10) ◽  
pp. 12638-12643 ◽  
Author(s):  
Weilong Chen ◽  
Honglie Shen ◽  
Xiangrong Zhu ◽  
Zhengwei Xing ◽  
Sanyang Zhang
Keyword(s):  
Citric Acid ◽  
Sol Gel ◽  
Composite Films ◽  
Photochromic Properties ◽  
Gel Method ◽  
Sol Gel Method

scholarly journals Novel Magnetic Silica-Ionic Liquid Nanocomposites for Wastewater Treatment

Nanomaterials ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 71 ◽  
Author(s):  
Ayman M. Atta ◽  
Yaser M. Moustafa ◽  
Abdelrahman O. Ezzat ◽  
Ahmed I. Hashem
Keyword(s):  
Ionic Liquid ◽  
Sol Gel ◽  
Acetic Acid Solution ◽  
Crystalline Lattice ◽  
Magnetic Characteristics ◽  
Surface Charges ◽  
Thermal Stabilities ◽  
Chemical Structures ◽  
Surface Areas ◽  
Silane Precursor

In this work, new imidazolium silica-ionic liquids doped with magnetite nanocomposites are prepared for use in the field of water purification owing to their unique properties, which can be manipulated by an external magnetic field. A silane precursor based on aminopropyltriethoxysilane (APTS) condensed with p-hydroxybenzaldehyde and glyoxal in an acetic acid solution is used to prepare disiloxyimidazolium ionic liquid (SIMIL). The silica composite (Si-IL) and silica-coated magnetite (Fe3O4-Si-IL) composites are prepared using the sol-gel technique. The chemical structures, morphologies, crystalline lattice structures, thermal stabilities, surface charges, surface areas, particle sizes, and magnetic characteristics of Fe3O4-Si-IL and Si-IL are investigated. The Fe3O4-Si-IL and Si-IL nanocomposites show excellent chemical adsorption capacities as 653 and 472 mg g−1, respectively, during times ranging 90 to 110 min when they are used as adsorbents to remove Congo red (CR) dye as a water pollutant.

Photochromic Properties of WO3 Thin films

2008 ◽  
Vol 368-372 ◽  
pp. 336-338
Author(s):  
Xin Min Wang ◽  
Bo Liu ◽  
Hong Hua Cai ◽  
Zhong Kuang Luo ◽  
Xiang Zhong Ren ◽  
...  
Keyword(s):  
Thin Films ◽  
Uv Light ◽  
Sol Gel ◽  
Dip Coating ◽  
Light Transmittance ◽  
Photochromic Properties ◽  
Heat Treated ◽  
Sol Gel Process ◽  
Different Temperatures ◽  
Dip Coating Technique

WO3 sol was prepared through the sol-gel process. Ethanol, acetone and SiO2 sol were added to the WO3 sol. The WO3 thin films on glass substrate were obtained with the hybrid sol by the dip-coating technique, and then were heat-treated at different temperatures for a certain time. X-ray diffractometer and scanning electron microscope were used to characterize the crystal structure and surface morphology of these coatings. Visible light transmittance changes of the thin films irradiated under UV light were measured with UV spectrometer. The experimental results demonstrated that photochromic effect, hardness and uniformity of thin films were improved when the thin films are obtained with the hybrid sol.

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