Difference between revisions of "Assembly of optical-scale dumbbells into dense photonic crystals"

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==Summary==
 
==Summary==
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Dumbbell-shaped colloidal particles can be made to assemble into crystals in the presence of an external AC electric field.  These crystal structures can have long-range order, and they exhibit photonic band gaps and birefringence.
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 +
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==Background==
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Colloids with anisotropic interactions are sometimes called "colloidal molecules."  The entire phase space of [[Self-assembly|self-assembly]] of such colloidal molecules has not been fully explored.  However, there have been many numerical simulations.  For dumbbell-shaped particles, such simulations indicate that the aspect ratio is very important for determining the phase behavior.
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The [[Self-assembly|self-assembly]] of dumbbells without external fields cannot produce large-scale structures, since such assembly can only take place in thin films.
  
  

Revision as of 06:57, 13 November 2012

Original Entry: Stephen Fleming, AP 225, Fall 2012

UNDER CONSTRUCTION

Figure 1, reproduced from [1]. Explanation.
Figure 2, reproduced from [1]. Explanation.
Figure 3, reproduced from [1]. Explanation.
Figure 4, reproduced from [1]. Explanation.

General Information

Authors: JD Forster, J Park, Manish Mittal, H Noh, CF Schreck, CS O'Hern, H Cao, EM Furst, and ER Dufresne

Publication: JD Forster, J Park, Manish Mittal, H Noh, CF Schreck, CS O'Hern, H Cao, EM Furst, and ER Dufresne. (2011) "Assembly of optical-scale dumbbells into dense photonic crystals." ACS Nano 5 (8), pp. 6695-6700.

Access to paper from ACS Publications

Keywords: Thin film, Self assembly

Summary

Dumbbell-shaped colloidal particles can be made to assemble into crystals in the presence of an external AC electric field. These crystal structures can have long-range order, and they exhibit photonic band gaps and birefringence.


Background

Colloids with anisotropic interactions are sometimes called "colloidal molecules." The entire phase space of self-assembly of such colloidal molecules has not been fully explored. However, there have been many numerical simulations. For dumbbell-shaped particles, such simulations indicate that the aspect ratio is very important for determining the phase behavior.

The self-assembly of dumbbells without external fields cannot produce large-scale structures, since such assembly can only take place in thin films.


Explanation of Experimental Methods

Results

Discussion

Reference

[1] JD Forster, J Park, Manish Mittal, H Noh, CF Schreck, CS O'Hern, H Cao, EM Furst, and ER Dufresne. (2011) "Assembly of optical-scale dumbbells into dense photonic crystals." ACS Nano 5 (8), pp. 6695-6700.