Department of Electrical Engineering, University of Missouri-Columbia, 349 Engineering Building West, Columbia, MO 65211, USA.
J Colloid Interface Sci. 2011 Dec 15;364(2):546-54. doi: 10.1016/j.jcis.2011.08.076. Epub 2011 Sep 6.
We demonstrate an original and powerful concept for elaborating spontaneous, high fidelity patterns of nanoporosity from nanoscale building blocks using patterned surface chemistry (i.e., "surface energy gating") to corral the growth of colloidal structures at a solid surface. Composite films consisting of polymethylsilsesquioxane nanoparticles uniformly dispersed in polypropylene glycol polymer were examined at temperatures beyond the decomposition of the polymer as a function of the substrate surface energy to clarify nanoparticulate ensemble behavior. The principle behind this colloidal assembly can be understood by taking into consideration the entropy and enthalpy dictating the mutual interactions between substrate surface, polymeric solvent, and dispersed colloids in the decomposition regime. The relevance of this research is shown by demonstrating how the principle of surface energy gating can be utilized to achieve spontaneous and controllable spatial patterns of nanoporous, high surface area thin films in a cost-effective and energy-efficient manner via brief thermal exposure. The simplicity and general nature of this methodology are further exemplified by showing the facility with which high-contrast fluorescent bioconjugate arrays can be prepared from nanoporous organosilicate patterns.
我们展示了一个原创且强大的概念，通过图案化表面化学（即“表面能门控”）来精心设计纳米级构建块的自发、高保真纳米多孔图案，从而在固 体表面控制胶体结构的生长。我们研究了由聚甲基倍半硅氧烷纳米颗粒均匀分散在聚丙二醇聚合物中的复合膜，考察了在聚合物分解温度以上、作为基 底表面能函数的条件下，纳米颗粒集合体的行为。在分解区域，考虑到控制基底面、聚合性溶剂和分散胶体之间相互作用的熵和焓，可以理解这种胶体组装背后的原理。该研究的相关性通过展示如何利用表面能门控原理以经济高效和节能的方式通过短暂的热暴露来实现具有高表面积的纳米多孔薄膜的自发和可控空间图案来证明。该方法的简单性和通用性通过展示从纳米多孔有机硅图案中制备高对比度荧光生物缀合物阵列的便利性进一步得到例证。
