National Changhua University of Education Institutional Repository : Item 987654321/11381
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题名: Formation of Two-Dimensional Colloidal Sphere Arrays on Micro-Patterns
作者: Bernotski, Neil A.;Xiong, Xiaorong;Wang, Kerwin;Nels E. Jewell-Larsen;Bohringer, Karl F.
贡献者: 機電工程學系
日期: 2005-04
上传时间: 2012-06-06T01:43:08Z
摘要: A hydrophobic substrate patterned with hydrophilic squares is used as a template for the selective deposition of two-dimensional micron and sub-micron polystyrene sphere arrays. In experiment, a monodisperse colloidal solution is applied to a patterned substrate. When the colloid is drawn off the substrate, two-dimensional arrays of colloidal spheres are selectively formed in the center of the hydrophilic squares. Optical microscopy coupled with high-speed photography allows the observation of this process for 1μm and 290nm polystyrene spheres. The observations reveal that as the body of colloid recedes off the substrate, the three-phase contact line becomes pinned at the pattern edges. This pinning causes the colloid to stretch across the hydrophilic areas, forming liquid films that neck and break off from the main body of colloid. The film is sufficiently thin to force the colloidal particles into a single layer. Capillary forces from the remaining liquid centers and packs the two-dimensional arrays in the hydrophilic patterns.
關聯: 2nd Annual Conference on Foundations of Nanoscience: Selfassembled Architectures and Devices (FNANO), Snowbird, UT
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