Difference between revisions of "Self-Assembly of Gradient Concentric Rings via Solvent Evaporation from a Capillary Bridge"

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===Capillarity Phenomena===
 
===Capillarity Phenomena===
  [[Image:capbridge1.jpg |left| |400px| |thumb| Figure 1: a) Drying geometry: The solute containing MEH-PVV is bound to the volume formed by a capillary bridge between a Si wafer and a microsphere.  b) As the toluene evaporates, a pattern of concentric rings forms at certain critical radii of the triple line, producing a non-constant inter-ring spacing <math>\lambda_{cc}</math> ]]
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  [[Image:capbridge1.jpg |left| |300px| |thumb| Figure 1: a) Drying geometry: The solute containing MEH-PVV is bound to the volume formed by a capillary bridge between a Si wafer and a microsphere.  b) As the toluene evaporates, a pattern of concentric rings forms at certain critical radii of the triple line, producing a non-constant inter-ring spacing <math>\lambda_{cc}</math> ]]

Revision as of 17:07, 6 March 2009

Jun Xu, Jianfeng Xia, Suck Won Hong, Zhiqun Lin, Feng Qiu and Yuliang Yang, Self-Assembly of Gradient Concentric Rings via Solvent Evaporation from a Capillary Bridge, PRL 96 066104 (2006) [1]

Brief Summary

The dewetting of a liquid forming a capillary bridge between a plane and a sphere is studied. The evaporating liquid carries MEH-PVV (a non-volatile polymer with optical applications) which in a sense acts to record the drying dynamics of the carrier liquid (toluene). In fact, the polymers also perturb the dewetting process via a ``slip-stick" mechanism similar to the effect observed when a drop dries off of an unclean surface. The evaporation process produces a pattern concentric rings of polymer on the Si substrate, with a non-trivial radial scaling of ring spacing: an artifact of the drying geometry.

Capillarity Phenomena

Figure 1: a) Drying geometry: The solute containing MEH-PVV is bound to the volume formed by a capillary bridge between a Si wafer and a microsphere. b) As the toluene evaporates, a pattern of concentric rings forms at certain critical radii of the triple line, producing a non-constant inter-ring spacing <math>\lambda_{cc}</math>