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Durham Research Online
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Design principles for Bernal spirals and helices with tunable pitch.

Fejer, S.N. and Chakrabarti, D. and Kusumaatmaja, H. and Wales, D.J. (2014) 'Design principles for Bernal spirals and helices with tunable pitch.', Nanoscale., 6 (16). pp. 9448-9456.

Abstract

Using the framework of potential energy landscape theory, we describe two in silico designs for self-assembling helical colloidal superstructures based upon dipolar dumbbells and Janus-type building blocks, respectively. Helical superstructures with controllable pitch length are obtained using external magnetic field driven assembly of asymmetric dumbbells involving screened electrostatic as well as magnetic dipolar interactions. The pitch of the helix is tuned by modulating the Debye screening length over an experimentally accessible range. The second design is based on building blocks composed of rigidly linked spheres with short-range anisotropic interactions, which are predicted to self-assemble into Bernal spirals. These spirals are quite flexible, and longer helices undergo rearrangements via cooperative, hinge-like moves, in agreement with experiment.

Item Type:Article
Full text:(AM) Accepted Manuscript
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Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1039/C4NR00324A
Date accepted:No date available
Date deposited:03 September 2014
Date of first online publication:August 2014
Date first made open access:No date available

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