通过非光刻生成的聚合物微纤维环上的接触线钉扎将水滴固定在疏水表面上
Immobilization of water drops on hydrophobic surfaces by contact line pinning at non-lithographically generated polymer microfiber rings
摘要：
用作反应隔室的水滴通常固定在由疏水区域邻接的亲水区域上。对于许多应用，例如捕获非贴壁细胞，期望利用疏水表面的惰性和防污行为以及它们对芯片实验室配置中的吸附物的排斥行为。然而，水滴在疏水表面上的固定化仍然具有挑战性。我们报道了一种非光刻的方法来阻止水滴在疏水改性的大孔硅（mSi）与peruorinated表面。从mSi大孔突出的聚苯乙烯-嵌段-聚（2-乙烯基吡啶）（PS-b-P2 VP）纤维的环处的接触线钉扎在疏水改性的mSi移动或倾斜时固定水滴，并防止PS-b-P2 VP纤维环内的去湿。如果没有PS-b-P2 VP纤维环，水滴很容易滚落。通过将PS-b-P2 VP溶液滴加到疏水改性的mSi上来制备PS-b-P2 VP纤维环。在由此形成的圆形PS-b-P2 VP膜中的P2 VP用热乙醇选择性溶胀，随后分离后者，得到表现出环形区域的疏水改性mSi，其中破裂的PS-b-P2 VP纤维从mSi大孔突出。例如，直径为6.5 mm、宽度约为0.2 mm的PS-b-P2 VP纤维环可吸收体积为50微升的水滴。
英文摘要：
Water drops used as reaction compartments are commonly immobilized on hydrophilic areas bordered by hydrophobic areas. For many applications, such as the trapping of non-adherent cells, it is desirable to exploit the inertness and the anti-fouling behavior of hydrophobic surfaces as well as their repulsive behavior towards adsorbates in lab-on-chip configurations. However, the immobilization of water drops on hydrophobic surfaces has remained challenging. We report a nonlithographic approach to arrest water drops on hydrophobically modified macroporous silicon (mSi) with per uorinated surface. Contact line pinning at rings of polystyrene-block-poly(2-vinylpyridine) (PS-b-P2VP) fibers protruding from the mSi macropores immobilizes water drops when the hydrophobically modified mSi is moved or tilted and prevents dewetting within the PS-b-P2VP fiber rings. Without PS-b-P2VP fiber rings, water drops readily roll off. The PS-b-P2VP fiber rings were prepared by dropping PS-b-P2VP solution onto hydrophobically modified mSi. Selective swelling of the P2VP in the thus-formed circular PS-b-P2VP films with hot ethanol followed by detachment of the latter yielded hydrophobically modified mSi exhibiting annular areas, in which ruptured PS-b-P2VP fibers protruded from the mSi macropores. For example, PS-b-P2VP fiber rings with diameters of 6.5 mm and widths of about 0.2 mm immobilize water drops with a volume of 50 microliters.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
