Difference between revisions of "Mesoscale Self-Assembly: Capillary Bonds and Negative Menisci"

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In their paper, Whitesides and coworkers float a layer of millimeter-sized PDMS [http://en.wikipedia.org/wiki/Polydimethylsiloxane] 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.
 
In their paper, Whitesides and coworkers float a layer of millimeter-sized PDMS [http://en.wikipedia.org/wiki/Polydimethylsiloxane] 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 [http://pubs.acs.org.ezp-prod1.hul.harvard.edu/doi/full/10.1021/ja983882z]
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This article was written as a sister article to another publication [http://pubs.acs.org.ezp-prod1.hul.harvard.edu/doi/full/10.1021/ja983882z]. In that paper, the authors used PDMS with a density of 1.05 g/cm^3, barely greater than than of water

Revision as of 19:14, 23 February 2009

Zach Wissner-Gross (February 23, 2009)

Information

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

Summary

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