Devices and methods for spatially and temporally reconfigurable assembly of colloidal crystals
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United States of America Patent
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Dec 26, 2017
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app pub date -
Apr 10, 2015
filing date -
Apr 18, 2014
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Abstract
The disclosure provides devices and methods for controlled assembly of colloidal particles. A medium with colloidal particles having a charged surface is placed in physical contact with an electrically conductive material (e.g., an ITO coating). An external light source directs light towards the electrically conductive material, thus driving the colloidal particles from a first non-assembled state to a second assembled state, which may thus create organized colloidal crystals or alternatively predetermined void regions. Assembly of the colloids can be achieved with no external electric fields or external magnetic fields. Moreover, the colloidal assembly is three-dimensional, occurs rapidly, and is entirely reversible and reconfigurable based on controlling the light applied to the electrically conductive material.
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