Mesoscale Self-Assembly: Capillary Bonds and Negative Menisci

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Zach Wissner-Gross (February 23, 2009)


Mesoscale Self-Assembly: Capillary Bonds and Negative Menisci [1]

Ned Bowden, Scott R. J. Oliver, and George M. Whitesides

The Journal of Physical Chemistry B, 2000, 104 (12), 2714-2724

Softmatter Keywords

Capillary forces, self-assembly, menisci, capillary length


In their paper, Whitesides and coworkers float a layer of millimeter-sized PDMS [2] hexagons between perfluorodecalin (PFD) and water. They further pre-treat different edges of the hexagons, making them either hydrophilic (by oxidizing the edges with a plasma cleaner) or hydrophobic (by protecting the edges from oxidation with an additional cured layer of PDMS). By carefully agitating the solutions, the authors are able to induce self-assembly over the course of minutes to hours, and observe how structure varies with different patterns of hydrophobicity/hydrophilicity.

This article was written as a sister article to another publication [3]. In that paper, the authors used PDMS with a density of 1.05 g/cm^3, barely greater than than of water