Optimization of synthesis parameters of mesoporous silica sol–gel thin films for application on 2024 aluminum alloy substrates

The synthesis of alkylpolyglucosides involves condensation of decanol with dextrose in the presence of mesoporous silica sol-gel as a catalyst. In this study, mesoporous silica was produced using sol-gel technique by converting tetraethyl orthosilicate (TEOS) into silica. The mesoporous silica was characterized using BET surface area measurement and X-ray Photoelectron Spectroscopy surface analysis. The specific BET surface area was 794m2/g. From the XPS analysis, the Si2p binding energy is 103.7 eV while the O1s binding energy is 532.8eV indicating the formation of Si-O-Si bond which attributed to SiO2. Mesoporous silica has been found efficient to be solid catalyst for synthesis alkylpolyglucosides and easy to be separated. The reaction was carried out 8 hours at 110°C-120°C under vacuum condition. The mass determination of alkylpoluglucosides has been achieved by ESI LC-MS/MS (ToF) positive-mode giving a mass peak at m/z = 343.21 corresponding to [M++ of alkylmonoglucoside peak at retention time 11.0 min.

Download Full-text

Near-Infrared (NIR) to Red and Green Up-Conversion Emission from Silica Sol−Gel Thin Films Made with La0.45Yb0.50Er0.05F3Nanoparticles, Hetero-Looping-Enhanced Energy Transfer (Hetero-LEET): A New Up-Conversion Process

Journal of the American Chemical Society ◽

10.1021/ja065378x ◽

2007 ◽

Vol 129 (3) ◽

pp. 620-625 ◽

Cited By ~ 172

Author(s):

Sri Sivakumar ◽

Frank C. J. M van Veggel ◽

P. Stanley May

Keyword(s):

Thin Films ◽

Energy Transfer ◽

Near Infrared ◽

Sol Gel ◽

Silica Sol ◽

Conversion Process

Download Full-text

The Influencing Factors for the Thickness of Silica Sol-Gel Film by the Dip Coating Process

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.597.165 ◽

2014 ◽

Vol 597 ◽

pp. 165-169

Author(s):

Jie Hong Lei ◽

Ri Dong Zhang

Keyword(s):

Thin Films ◽

Surface Roughness ◽

Refractive Index ◽

Sol Gel ◽

Dip Coating ◽

Silica Sol ◽

Coating Process ◽

Power Functions ◽

Withdrawal Speed ◽

Gel Film

The porous sol-gel silica thin films were prepared on silicon substrate by the dip coating process. The surface roughness and microstructure of the film was measured by optical microscopy and AFM .Coating thickness and refractive index were measured by ellipsometry method. Influence of withdrawal speed and concentration of colloid was investigated for the thickness of silica. The relation of the thickness and withdrawal speed was fitted by the linear and power functions, and the results were analyzed and compared. It was found that the films with the same thickness prepared by different concentrations of colloid have different refractive indexes. The experimental results indicated that the thickness and refractive index of the film can be controlled by changing the withdrawal speed and colloid concentration.

Download Full-text

A method for the preparation of transparent mesoporous silica sol–gel monoliths containing grafted organic functional groups

Journal of Materials Chemistry ◽

10.1039/b417014h ◽

2005 ◽

Vol 15 (24) ◽

pp. 2356 ◽

Cited By ~ 21

Author(s):

Cheri W. Clavier ◽

D. Lynn Rodman ◽

Joseph F. Sinski ◽

Leonardo R. Allain ◽

Hee-Jung Im ◽

...

Keyword(s):

Mesoporous Silica ◽

Functional Groups ◽

Sol Gel ◽

Silica Sol ◽

Organic Functional Groups

Download Full-text

Fabrication of Mesoporous Silica Thin Film Platforms for Surface Reaction with Surface Plasmon Resonance

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.758.24 ◽

2017 ◽

Vol 758 ◽

pp. 24-28 ◽

Cited By ~ 1

Author(s):

Sota Ushijima ◽

Toshiyuki Ikoma

Keyword(s):

Thin Films ◽

Surface Plasmon Resonance ◽

Mesoporous Silica ◽

Cationic Surfactant ◽

Surface Plasmon ◽

Plasmon Resonance ◽

Surface Reaction ◽

Sol Gel ◽

Silica Thin Films ◽

Gold Substrates

Mesoporous silica thin films were fabricated on gold substrates with a sol-gel method including a cationic surfactant. The interface of gold and silica thin films was fixed with a mercaptosilane. The surface roughness of the thin films and their grain sizes of silica were both increased with the elimination of the cationic surfactant and polyethylene glycol (PEG) modification on its surface. The surface reaction, adsorption of bovine serum albumin (BSA), was monitored with surface plasmon resonance (SPR). Although the adsorption amount of BSA at 1 mg/mL were 7.9 ng/cm2 on the mesoporous silica, the PEG modification can completely desorb BSA. The mesoporous silica thin films on gold substrates fabricated will be a good platform for analyzing surface reaction.

Download Full-text