Long-Range Hydrophilic Attraction between Water and Polyelectrolyte Surfaces in Oil.
Long-Range Hydrophilic Attraction between Water and Polyelectrolyte Surfaces in Oil.
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DOI：
10.1002/anie.201608219
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发表时间：
2016-11
影响因子：
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通讯作者：
Chen Shi;Bin Yan;Lei Xie;Ling Zhang;Jingyi Wang;A. Takahara;Hongbo Zeng
中科院分区：
文献类型：
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作者：
Chen Shi;Bin Yan;Lei Xie;Ling Zhang;Jingyi Wang;A. Takahara;Hongbo Zeng
表面优异的水润湿性和自发清除油污的能力取决于其在周围介质中的润湿机制。在这里，我们已经量化的纳米力学之间的三种类型的表面（即两性离子，阳离子和阴离子）和水或油滴使用原子力显微镜（AFM）滴探针技术，并阐明了固有的润湿机制的表面在油和水介质。油滴与油膜表面间的作用力可用DLVO理论描述。令人惊讶的是，在油中的水滴和表面之间发现了强烈的长程吸引力，并且测量了聚两性离子的最强相互作用。油中的这种意外的长程“亲水”吸引力可归因于强偶极相互作用，因为聚电解质的大偶极矩。我们的研究结果为开发新型聚电解质基材料和涂层提供了新的纳米力学见解，可用于广泛的工程，生物工程和环境应用。
The outstanding water wettability and the capability of polyelectrolyte surfaces to spontaneously clean oil fouling are determined by their wetting mechanism in the surrounding medium. Here, we have quantified the nanomechanics between three types of polyelectrolyte surfaces (i.e. zwitterionic, cationic, and anionic) and water or oil drops using an atomic force microscope (AFM) drop probe technique, and elucidated the intrinsic wetting mechanisms of the polyelectrolyte surfaces in oil and water media. The measured forces between oil drops and polyelectrolyte surfaces in water can be described by the Derjaguin-Landau-Verwey-Overbeek (DLVO) theory. Surprisingly, strong long-range attraction was discovered between polyelectrolyte surfaces and water drops in oil, and the strongest interaction was measured for the polyzwitterion. This unexpected long-range "hydrophilic" attraction in oil could be attributed to a strong dipolar interaction because of the large dipole moment of the polyelectrolytes. Our results provide new nanomechanical insights into the development of novel polyelectrolyte-based materials and coatings for a wide range of engineering, bioengineering, and environmental applications.