Inscribing wettability gradients onto polymer substrates with different stiffness using corona discharge in point-to-plane geometry
Inscribing wettability gradients onto polymer substrates with different stiffness using corona discharge in point-to-plane geometry
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DOI：
10.1016/j.apsusc.2014.12.169
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发表时间：
2015-03
影响因子：
6.7
通讯作者：
A. Eifert;Julien Petit;T. Baier;E. Bonaccurso;S. Hardt
中科院分区：
文献类型：
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作者：
A. Eifert;Julien Petit;T. Baier;E. Bonaccurso;S. Hardt
我们使用直流（DC）电晕放电在聚合物表面产生润湿性梯度。由于点对面排列导致的电流密度分布不均匀，引起聚合物表面润湿性的局部变化，从而产生宏观的润湿性梯度。我们发现，与宏观接触角测量相比，表面水蒸气的凝结可以更精确地表征润湿性梯度。冷凝实验允许表征不同润湿性的不同区域。润湿性模式取决于基材的刚度。我们推测库仑相互作用影响润湿性的空间分布。接触后静电表面电位的间接测量支持这一假设。
We use direct current (DC) corona discharge to create wettability gradients on polymer surfaces. The inhomogeneous current density distribution due to a point-to-plane arrangement induces local changes of the wettability of polymer surfaces, resulting in macroscopic wettability gradients. We found that condensation of water vapor on the surface allows a more precise characterization of the wettability gradient than macroscopic contact angle measurements. Condensation experiments allow characterizing different zones with different wettability. The wettability pattern depends on the stiffness of the substrate. We conjecture that Coulomb interactions influence the spatial distribution of wettability. Indirect measurements of the electrostatic surface potential after exposure support this assumption.