Department of Physics, Washington University, St. Louis, Missouri 63130, USA.
ACS Nano. 2011 Jan 25;5(1):470-6. doi: 10.1021/nn1022632. Epub 2010 Dec 22.
Surfaces made from composite nanostructured materials are potential multifunctional platforms for detection, sensing, and energy harvesting in biological and inorganic systems. However, robust and cost-effective synthesis routes are required to create the required arrays of nanostructures with tailorable size, morphology, and composition. Here we show that self-organization via spontaneous pattern formation in nanometer thick bilayer liquid films could lead to such nanostructure arrays. Experimentally, bilayers of immiscible metallic liquids show different self-organized patterning characteristics based on their order of arrangement on a substrate. Energy rate theory based on equating the rate of free energy change to viscous dissipation was used to explain this result. The different bilayer arrangements change the signs of intermolecular interactions, which changes the mode of coupled deformations and the patterning characteristics. Patterning length scale characteristics from nanosecond pulsed laser induced self-organization of Ag and Co liquids on SiO₂ substrate were in good agreement with theory.
由复合纳米结构材料制成的表面是用于生物和无机系统中检测、传感和能量收集的潜在多功能平台。然而，需要强大且具有成本效益的合成途径来创建具有可定制尺寸、形态和组成的所需纳米结构阵列。在这里，我们表明通过纳米厚双层液体膜中的自发图案形成进行自组织可以导致这种纳米结构阵列。在实验中，不混溶的金属液体的双层根据它们在基板上的排列顺序表现出不同的自组织图案化特征。基于将自由能变化率等同于粘性耗散的能量率理论用于解释这一结果。不同的双层排列改变了分子间相互作用的符号，从而改变了耦合变形的模式和图案化特征。纳秒脉冲激光诱导的 Ag 和 Co 液体在 SiO₂ 衬底上的自组织的图案化长度尺度特征与理论很好地吻合。
