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Role of Entropy in the Expulsion of Dopants from Optically Trapped Colloidal Assemblies

Kakoty, Hreedish and Banerjee, Rajarshi and Dasgupta, Chandan and Ghosh, Ambarish (2016) Role of Entropy in the Expulsion of Dopants from Optically Trapped Colloidal Assemblies. In: PHYSICAL REVIEW LETTERS, 117 (25).

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Official URL: http://dx.doi.org/10.1103/PhysRevLett.117.258002


Controlling an assembly of colloidal particles under external forces can be helpful in developing soft nanomaterials with novel functionalities. How external impurities organize within such confined systems is of fundamental and technological interest, especially when the system sizes are so small that even a single dopant can interact with an appreciable fraction of the system. To address this question, we use a defocused laser beam to form two-dimensional colloidal crystallites containing foreign dopants. Our studies reveal a surprising position dependence in the fate of dopants getting either spontaneously expelled or permanently internalized within the crystallite. This phenomenon arises due to the subtle interplay between the effects of external confinement and the role of entropy in the thermodynamics of small assemblies of interacting particles.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to theAMER PHYSICAL SOC, ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Division of Physical & Mathematical Sciences > Physics
Date Deposited: 21 Jan 2017 08:46
Last Modified: 21 Jan 2017 08:46
URI: http://eprints.iisc.ac.in/id/eprint/55958

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