Formation of two-dimensional colloidal sphere arrays on micro-patterns

Neil A. Bernotski, Xiaorong Xiong, Kerwin Wang, Nels E. Jewell-Larsen, Karl F. Böhringer

Research output: Contribution to conferencePaper

4 Citations (Scopus)

Abstract

A hydrophobic substrate patterned with hydrophilic squares is used as a template for the selective deposition of two-dimensional micron and submicron 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.

Original languageEnglish
Pages76-82
Number of pages7
Publication statusPublished - 2005 Dec 1
Event2nd Conference on Foundations of Nanoscience: Self-Assembled Architectures and Devices, FNANO 2005 - Snowbird, UT, United States
Duration: 2005 Apr 242005 Apr 28

Other

Other2nd Conference on Foundations of Nanoscience: Self-Assembled Architectures and Devices, FNANO 2005
CountryUnited States
CitySnowbird, UT
Period05-04-2405-04-28

All Science Journal Classification (ASJC) codes

  • Hardware and Architecture
  • Electrical and Electronic Engineering

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  • Cite this

    Bernotski, N. A., Xiong, X., Wang, K., Jewell-Larsen, N. E., & Böhringer, K. F. (2005). Formation of two-dimensional colloidal sphere arrays on micro-patterns. 76-82. Paper presented at 2nd Conference on Foundations of Nanoscience: Self-Assembled Architectures and Devices, FNANO 2005, Snowbird, UT, United States.