Molecular features of water films created with bubbles at silica surfaces
Wang, Xuming1; Yin, Xihui1; Nalaskowski, Jakub2; Du, Hao3; Miller, Jan D.1
2015-03-01
发表期刊SURFACE INNOVATIONS
ISSN2050-6252
卷号3期号:1页码:20-26
摘要

Sum frequency vibrational spectroscopy (SFVS) spectra indicate that a very ordered water structure exists in the stable water film at a hydrophilic silica surface during contact with a bubble and that the extent of hydrogen bonding increases with an increase in contact pressure. In contrast, the SFVS spectra of water at a hydrophobic silica surface show a lack of hydrogen bonding and are characterized by a distinct absorption at about 3700 cm(-1), similar to the spectrum of the air/water interface. These results suggest the presence of a water exclusion zone at the hydrophobic surface, as supported by X-ray reflectivity measurements reported in the literature, by AFM images, and by results from molecular dynamics simulations. Of course, the water film at the hydrophobic surface is unstable with film thinning and rupture upon bubble contact. Under these circumstances, it is shown that an attractive van der Waals force between a bubble and the hydrophobic surface can be expected when the water exclusion zone is taken into consideration. As the thickness of the water exclusion zone increases to a thickness corresponding to the size of nanobubbles, the calculated attractive van der Waals force increases. This analysis may help to explain the so-called 'short-range' and 'long-range' hydrophobic forces.

关键词Film Hydrophilic Hydrophobic Surface Characterization Wetting
文章类型Article
WOS标题词Science & Technology ; Physical Sciences ; Technology
DOI10.1680/si.14.00006
收录类别SCI
语种英语
关键词[WOS]VIBRATIONAL SPECTROSCOPY ; PARTICLE ; ATTACHMENT ; FORCES ; INTERFACE ; STATES
WOS研究方向Chemistry ; Materials Science
WOS类目Chemistry, Physical ; Materials Science, Coatings & Films
项目资助者Division of Chemical Sciences, Geosciences, and Biosciences, Office of Basic Energy Sciences of the U.S. Department of Energy(DE-FG-03-93ER14315)
WOS记录号WOS:000366978900004
引用统计
被引频次:12[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ipe.ac.cn/handle/122111/20186
专题湿法冶金清洁生产技术国家工程实验室
作者单位1.Univ Utah, Dept Met Engn, Coll Mines & Earth Sci, Salt Lake City, UT 84112 USA
2.Cabot Microelect, Aurora, IL USA
3.Chinese Acad Sci, Natl Engn Lab Hydromet Cleaner Prod Technol, Inst Proc Engn, Beijing, Peoples R China
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GB/T 7714
Wang, Xuming,Yin, Xihui,Nalaskowski, Jakub,et al. Molecular features of water films created with bubbles at silica surfaces[J]. SURFACE INNOVATIONS,2015,3(1):20-26.
APA Wang, Xuming,Yin, Xihui,Nalaskowski, Jakub,Du, Hao,&Miller, Jan D..(2015).Molecular features of water films created with bubbles at silica surfaces.SURFACE INNOVATIONS,3(1),20-26.
MLA Wang, Xuming,et al."Molecular features of water films created with bubbles at silica surfaces".SURFACE INNOVATIONS 3.1(2015):20-26.
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