Probing substrate effects on relaxation dynamics of ultrathin poly(vinyl acetate) films by dynamic wetting of water droplets on their surfaces
Probing substrate effects on relaxation dynamics of ultrathin poly(vinyl acetate) films by dynamic wetting of water droplets on their surfaces
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通过表面水滴的动态润湿探测基材对超薄聚醋酸乙烯酯薄膜松弛动力学的影响
DOI：
10.1039/c3sm52150h
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发表时间：
2013-11
期刊：
影响因子：
3.4
通讯作者：
Wang Xinping
中科院分区：
文献类型：
--
作者：
Zheng Fanfan;Zuo Biao;Zhu Yumei;Yang Juping;Wang Xinping
The dynamic wetting of water droplets on ultrathin poly(vinyl acetate) (PVAc) films supported by substrates with tunable surface hydroxyl group content was investigated at room temperature. The jumping angle of water droplets on the ultrathin PVAc films decreased with increasing hydroxyl content on the substrate surface, while a smooth evolution of the water droplet contacting line emerged for the film supported by a substrate with 100% hydroxyl groups. The critical thickness of ultrathin PAVc films, through which the interfacial effect from substrate chemistry on the dynamic wetting of water droplets on their surfaces will disappear, was measured by this novel method and the results showed that the critical thickness increased from ∼35 nm to ∼75 nm with increasing hydroxyl content from 41% to 100% on the substrate. This relationship between critical thickness and hydroxyl content was attributed to the intensities of the hydrogen bonds, resulting in lower chain mobility at the interface and a higher elastic modulus of the whole ultrathin film. This study demonstrates that the dynamic wetting of a liquid droplet on ultrathin polymer films is very sensitive and effective to access their mechanical properties, relaxation behavior and those properties affected by the substrate surface chemistry.
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影响因子：
3.9
作者：
Kwok, DY;Gietzelt, T;Neumann, AW
通讯作者：
Neumann, AW
影响因子：
15
作者：
Sigal, GB;Mrksich, M;Whitesides, GM
通讯作者：
Whitesides, GM
影响因子：
15
作者：
Guifeng Li;S. Ye;Shigeaki Morita;T. Nishida;M. Osawa
通讯作者：
Guifeng Li;S. Ye;Shigeaki Morita;T. Nishida;M. Osawa
影响因子：
64.8
作者：
KIM, E;XIA, YN;WHITESIDES, GM
通讯作者：
WHITESIDES, GM
影响因子：
3.9
作者：
Huang, Cheng;Katz, Howard E.;West, James E.
通讯作者：
West, James E.