Controlling water adhesion on superhydrophobic surfaces with bi-functional polymers
Controlling water adhesion on superhydrophobic surfaces with bi-functional polymers
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DOI：
10.1016/j.colsurfa.2021.126307
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发表时间：
2021-05
期刊：
影响因子：
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通讯作者：
Daiki Arisawa;Yasushi Umetsu;A. Yoshizawa;Christopher Hill;J. Eastoe;F. Guittard;Thierry Darmanin
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文献类型：
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作者：
Daiki Arisawa;Yasushi Umetsu;A. Yoshizawa;Christopher Hill;J. Eastoe;F. Guittard;Thierry Darmanin
为了控制在各种天然表面上观察到的表面疏水性和水粘附性，合成了具有一个和两个3-三甲基甲硅烷基丙基（TMS）基团的新型3，4-丙烯二氧噻吩（ProDOT）单体，并进行电聚合以形成表面涂层。使用单体ProDOT是因为其倾向于通过电聚合形成纤维结构[T. Darmanin，F.吉塔德，脱线。146（2014）6-11]，而TMS基团产生与短链碳氟化合物相当的非常低的表面能[N. M. Kovalchuk等人，胶体表面A 604（2020）125277。结果表明，即使这两种类型的单体导致纤维结构，纤维的尺寸以及润湿性能是不同的。只有一个单一的TMS基团的单体（ProDOTSiMe 3）产生极长的纳米纤维，只有低的表面粗糙度。所得表面具有高达141.7°的极高表观接触角（θw）和强的水粘附性，类似于玫瑰花瓣或壁虎脚。另一方面，具有两个TMS基团的类似物（ProDOT（SiMe 3）2）形成短纳米纤维，但具有极高的表面粗糙度。所得到的表面是超疏水的，θw> 160°和超低的水附着力（滞后和滑动角< 1°），类似于荷叶。这些结果指出了在保持高疏水性的同时提供对水粘附的控制的有趣应用。
With an aim to control the surface hydrophobicity and water adhesion, as observed on various natural surfaces, novel 3,4-propylenedioxythiophene (ProDOT) monomers having one and two 3-trimethylsilylpropyl (TMS) groups were synthesized and subjected to electropolymerization to form surface coatings. The monomer ProDOT is employed owing to its tendency to form fibrous structures by electropolymerization [T. Darmanin, F. Guittard, Mater. Chem. Phys. 146 (2014) 6–11], whereas the TMS groups generate very low surface energies comparable to short chain fluorocarbons [N. M. Kovalchuk, et al., Colloids Surfaces A 604 (2020) 125277.]. It is shown that even though these two types of monomer lead to fibrous structures, the dimensions of the fibers as well as the wetting properties are different. The monomer with only a single TMS group (ProDOTSiMe3) generates extremely long nanofibers with only low surface roughness. The resulting surfaces have extremely high apparent contact angles (θw) up to 141.7° and strong water adhesion, similar to rose petals or gecko feet. On the other hand, the analogue with two TMS groups (ProDOT(SiMe3)2) forms short nanofibers but with extremely high surface roughness. The resulting surfaces are superhydrophobic withθw> 160° and ultra-low water adhesion (hysteresis and sliding angles < 1°), similar to lotus leaves. These results point to interesting applications offering control over water adhesion whilst maintaining high hydrophobicity.