Characterization of Adsorbed Molecular Water on the Surface of a Stretched Polytetrafluoroethylene Tape Analyzed by 1H NMR
Characterization of Adsorbed Molecular Water on the Surface of a Stretched Polytetrafluoroethylene Tape Analyzed by 1H NMR
复制标题
通过 1H NMR 分析拉伸聚四氟乙烯带表面吸附分子水的表征
DOI：
10.1021/acs.jpcb.5b11276
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发表时间：
2016
期刊：
影响因子：
3.3
通讯作者：
and Takeshi Hasegawa
中科院分区：
文献类型：
--
作者：
Chihiro Wakai;Takafumi Shimoaka;and Takeshi Hasegawa
单个分子通常表现出与大块物质大不相同的物质特性。虽然全氟烷基（Rf）化合物是一个有代表性的，许多人的兴趣主要是致力于大规模的字符只有到目前为止，离开单分子的字符不清楚。最近，一个新的理论框架，分层偶极阵列（SDA）理论，出现了全面的理解Rf化合物在单一和散装系统。根据这一理论，机械拉伸的聚四氟乙烯（PTFE）预计将表现出具有偶极驱动特性的单分子特征，这将吸引分子水。在本研究中，一个拉伸的PTFE带被揭示，以吸引分子水（而不是水滴），和吸附的水分子在运动中受到高度限制的偶极-偶极相互作用，通过使用1H NMR研究，这与SDA理论的预测一致。
A single molecule often exhibits a largely different material character from a bulk matter. Although a perfluoroalkyl (Rf) compound is a representative one, many interests have mostly been devoted to the bulk character only thus far, leaving the single molecular character unclear. Recently, a new theoretical framework, stratified dipole-arrays (SDA) theory, has appeared for comprehensive understanding of Rf compounds in terms of both single and bulk systems. On this theory, a mechanically stretched polytetrafluoroethylene (PTFE) is expected to exhibit a single-molecular character having dipole-driven properties, which should attract molecular water. In the present study, a stretched PTFE tape is revealed to attract molecular water (not water droplet) in fact, and the adsorbed water molecules are highly restricted in motion by the dipole–dipole interaction studied by using1H NMR, which agrees with the prediction by the SDA theory.