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Wettability study of surface modified silica aerogels with different silylating agents
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Wettability study of surface modified silica aerogels with different silylating agents
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Journal Article
Wettability study of surface modified silica aerogels with different silylating agents
2012
Overview
In wettability study, surface free energy interactions are of crucial importance for silica aerogels in which absorption of organic liquids and transportation of chemicals carried out for chemical and biotechnological applications. In present study, we have used Lifshitz–van der Waals/acid–base approach for calculation of surface free energy of aerogel sample. We have investigated that the surface free energy values of aerogels are 45.95, 51.42 and 45.69 mJ/m
2
by modifying their surfaces using 7 % chlorotrimethylsilane (TMCS), dimethyldichlorosilane (DMDCS) and hexamethyldisilazane (HMDZ) silylating reagents with solvent, respectively. The alcogels were prepared by two step acid–base catalyzed process where the molar ratio of precursors tetraethoxysilane:methanol:oxalic acid:NH
4
OH:NH
4
F was kept at optimal value of 1:16.5:0.71:0.58:0.60:0.98, respectively. To modify gel surfaces, TMCS, DMDCS and HMDZ concentration have been varied from 5 to 12 % and such alcogels were dried at ambient pressure. The aerogels have been characterized by fourier transform infrared spectroscopy, scanning electron microscopy, thermo-gravimetric and differential thermal analysis and Wetting properties of silica aerogel surfaces was studied by contact angle measurements. The surface chemical composition of DMDCS modified silica aerogels was studied by using X-ray photoelectron spectroscopy. As there is not any direct method, we have used Lifshitz–van der Waals/acid–base approach which gives, polar and non-polar components of aerogels surface free energy.
Publisher
Springer US,Springer,Springer Nature B.V
Subject
/ Aerogels
/ Ceramics
/ Chemistry and Materials Science
/ Colloidal gels. Colloidal sols
/ Colloidal state and disperse state
/ Differential thermal analysis
/ Exact sciences and technology
/ General and physical chemistry
/ Glass
/ Optical and Electronic Materials
/ Pressure
/ Reagents
/ Scanning electron microscopy
/ Solvents
/ Wetting
