Department of Chemical & Materials Engineering, P.O. Box 441021, University of Idaho, Moscow, Idaho 83844-1021, USA.
ACS Appl Mater Interfaces. 2009 Oct;1(10):2325-31. doi: 10.1021/am900481d.
Networks of nano/microfibers (fiber mats) have been electrospun from solutions of dispersed poly(vinylpyrrolidone) (PVP) and a titania precursor onto glass and indium-tin oxide (ITO) plates to study their wettability. Collection time and electrode separation are the two key fabrication parameters investigated, along with the flow rate, polymer molecular weight, and drying conditions, to determine the effects on network morphology and the relationship to contact angles. Measurements indicate that the fiber mats on both glass and ITO increase in thickness and contact angle for longer spinning time and shorter distance, resulting in an extreme case of apparent ultrahydrophobicity on ITO of up to 169.9 degrees with water. The fiber mats are shown by optical microscopy to exhibit differences in morphology for insulating glass (straight) and conductive ITO (loopy) substrates responsible for the wide-ranging and well-controlled wettability to within 1-2 degrees. Fiber mats baked at 200 degrees C for 24 h show excellent mechanical stability with wetting even against frequent heavy rinsing, conducive for reusable aqueous applications such as biosensors or cellular scaffolding.
纳米/微纤维（纤维垫）网络已通过将分散的聚（乙烯基吡咯烷酮）（PVP）和钛酸酯前体的溶液静电纺丝到玻璃和氧化铟锡（ITO）板上而制成，以研究其润湿性。收集时间和电极间隔是研究的两个关键制造参数，以及流速，聚合物分子量和干燥条件，以确定对网络形态的影响以及与接触角的关系。测量表明，对于较长的纺丝时间和较短的距离，玻璃和 ITO 上的纤维垫的厚度和接触角均增加，导致在 ITO 上出现高达 169.9 度的明显超疏水性，水的接触角为 169.9 度。光学显微镜显示，对于绝缘玻璃（直）和导电 ITO（环状）衬底，纤维垫的形态存在差异，这是导致润湿范围广泛且可控制在 1-2 度内的原因。在 200°C 下烘烤 24 小时的纤维垫即使经过频繁的重冲洗也具有出色的机械稳定性，有利于可重复使用的水基应用，例如生物传感器或细胞支架。
