Torchinsky I, Rosenman G
Department of Physical Electronics, School of Electrical Engineering, Tel Aviv University, Tel Aviv, 69978 Israel.
Nanoscale Res Lett. 2009 Jul 2;4(10):1209-1217. doi: 10.1007/s11671-009-9380-0.
Controllable modification of surface free energy and related properties (wettability, hygroscopicity, agglomeration, etc.) of powders allows both understanding of fine physical mechanism acting on nanoparticle surfaces and improvement of their key characteristics in a number of nanotechnology applications. In this work, we report on the method we developed for electron-induced surface energy and modification of basic, related properties of powders of quite different physical origins such as diamond and ZnO. The applied technique has afforded gradual tuning of the surface free energy, resulting in a wide range of wettability modulation. In ZnO nanomaterial, the wettability has been strongly modified, while for the diamond particles identical electron treatment leads to a weak variation of the same property. Detailed investigation into electron-modified wettability properties has been performed by the use of capillary rise method using a few probing liquids. Basic thermodynamic approaches have been applied to calculations of components of solid-liquid interaction energy. We show that defect-free, low-energy electron treatment technique strongly varies elementary interface interactions and may be used for the development of new technology in the field of nanomaterials.
对粉末表面自由能及相关性质（润湿性、吸湿性、团聚等）进行可控修饰，既能深入了解作用于纳米颗粒表面的精细物理机制，又能在许多纳米技术应用中改善其关键特性。在本工作中，我们报告了所开发的一种方法，用于电子诱导的表面能以及对物理来源差异很大的粉末（如金刚石和氧化锌）的基本相关性质进行修饰。所应用的技术实现了表面自由能的逐步调节，从而实现了广泛的润湿性调制。在氧化锌纳米材料中，润湿性得到了强烈修饰，而对于金刚石颗粒，相同的电子处理导致该性质的变化较弱。通过使用几种探测液体的毛细管上升法，对电子修饰的润湿性进行了详细研究。已应用基本热力学方法来计算固液相互作用能的组成部分。我们表明，无缺陷的低能电子处理技术会强烈改变基本界面相互作用，可用于纳米材料领域新技术的开发。
