World Premier International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS) , 1-1 Namiki, Tsukuba 305-0044, Japan.
ACS Nano. 2014 Oct 28;8(10):10631-9. doi: 10.1021/nn5041729. Epub 2014 Oct 9.
Today many aspects of science and technology are progressing into the nanoscale realm where surfaces and interfaces are intrinsically important in determining properties and performances of materials and devices. One familiar phenomenon in which interfacial interactions play a major role is the wetting of solids. In this work we use a facile one-step plasma method to control the wettability of boron nitride (BN) nanostructure films via covalent chemical functionalization, while their surface morphology remains intact. By tailoring the concentration of grafted hydroxyl groups, superhydrophilic, hydrophilic, and hydrophobic patterns are created on the initially superhydrophobic BN nanosheet and nanotube films. Moreover, by introducing a gradient of the functional groups, directional liquid spreading toward increasing [OH] content is achieved on the films. The resulting insights are meant to illustrate great potentials of this method to tailor wettability of ceramic films, control liquid flow patterns for engineering applications such as microfluidics and biosensing, and improve the interfacial contact and adhesion in nanocomposite materials.
如今，科学技术的许多方面都在向纳米尺度发展，在这个尺度上，表面和界面在决定材料和器件的性能方面起着至关重要的作用。一个熟悉的现象是，界面相互作用在固体的润湿中起着主要作用。在这项工作中，我们使用一种简单的一步等离子体方法，通过共价化学功能化来控制氮化硼（BN）纳米结构薄膜的润湿性，同时保持其表面形貌完整。通过调整接枝羟基的浓度，可以在最初的超疏水 BN 纳米片和纳米管薄膜上形成超亲水、亲水和疏水图案。此外，通过引入官能团的梯度，可以在薄膜上实现液体向[OH]含量增加的方向的定向扩展。得到的见解旨在说明这种方法在调整陶瓷薄膜润湿性、控制微流控和生物传感等工程应用中的液体流动模式以及改善纳米复合材料中界面接触和附着力方面具有巨大的潜力。
