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Structure of the Submonolayer of Ethanol Adsorption on a Vapor/Fused Silica Interface Studied with Sum Frequency Vibrational Spectroscopy
Xu, HJ; Zhang, DH; Hu, J; Tian, CS; Shen, YR
2015
Source PublicationJOURNAL OF PHYSICAL CHEMISTRY A
Volume119Issue:19Pages:4573—4580
Subtype期刊文献
AbstractSum-frequency vibrational spectroscopy in the CH and OH stretch region was used to study ethanol adsorption on fused silica from vapor of different ethanol partial pressures. It was found that the adsorbed ethanol molecules were oriented with their methyl group tilted away from the surface normal by an average angle of similar to 45 degrees at low ethanol vapor pressures and similar to 39 degrees when approaching saturated vapor pressure. The spectral change with ethanol vapor pressure and the deduced adsorption isotherm show that ethanol molecules have two distinct adsorption sites on silica: One is the silanol group site to which an ethanol molecule can be strongly hydrogen-bonded, and the other is the siloxane (Si-O-Si) group site to which an ethanol molecule can be weakly bonded. The presence of water in vapor significantly reduced the surface coverage of ethanol on silica due to competitive adsorption between ethanol and water.
KeywordGeneration Spectroscopy Molecular Adsorption Liquid Interfaces Nonlinear Optics Water Interfaces Silanol Groups Sfg-vs Surfaces Phase Spectra
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/24585
Collection中科院上海应用物理研究所2011-2019年
Recommended Citation
GB/T 7714
Xu, HJ,Zhang, DH,Hu, J,et al. Structure of the Submonolayer of Ethanol Adsorption on a Vapor/Fused Silica Interface Studied with Sum Frequency Vibrational Spectroscopy[J]. JOURNAL OF PHYSICAL CHEMISTRY A,2015,119(19):4573—4580.
APA Xu, HJ,Zhang, DH,Hu, J,Tian, CS,&Shen, YR.(2015).Structure of the Submonolayer of Ethanol Adsorption on a Vapor/Fused Silica Interface Studied with Sum Frequency Vibrational Spectroscopy.JOURNAL OF PHYSICAL CHEMISTRY A,119(19),4573—4580.
MLA Xu, HJ,et al."Structure of the Submonolayer of Ethanol Adsorption on a Vapor/Fused Silica Interface Studied with Sum Frequency Vibrational Spectroscopy".JOURNAL OF PHYSICAL CHEMISTRY A 119.19(2015):4573—4580.
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