Design principles for Bernal spirals and helices with tunable pitch

Szilard Fejer, Dwaipayan Chakrabarti, Halim Kusumaatmaja, David Wales

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)


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.
Original languageEnglish
Pages (from-to)9448-9456
Number of pages9
Issue number16
Publication statusPublished - 22 Apr 2014


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