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Kinematic and mechanical profile of the self-actuation of thermosalient crystal twins of 1,2,4,5-tetrabromobenzene: A molecular crystalline analogue of a bimetallic strip

Sahoo, Subash; Sinha, Shashi; Mangalampalli, S.R.N. Kiran; Ramamurty, U; Dericioglu, Arcan F; Reddy, C Malla; Naumov, Pance

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A paradigm shift from hard to flexible, organic-based optoelectronics requires fast and reversible mechanical response from actuating materials that are used for conversion of heat or light into mechanical motion. As the limits in the response times of polymer-based actuating materials are reached, which are inherent to the less-than-optimal coupling between the light/heat and mechanical energy in them, a conceptually new approach to mechanical actuation is required to leapfrog the performance...[Show more]

dc.contributor.authorSahoo, Subash
dc.contributor.authorSinha, Shashi
dc.contributor.authorMangalampalli, S.R.N. Kiran
dc.contributor.authorRamamurty, U
dc.contributor.authorDericioglu, Arcan F
dc.contributor.authorReddy, C Malla
dc.contributor.authorNaumov, Pance
dc.date.accessioned2015-12-10T23:20:36Z
dc.identifier.issn0002-7863
dc.identifier.urihttp://hdl.handle.net/1885/66403
dc.description.abstractA paradigm shift from hard to flexible, organic-based optoelectronics requires fast and reversible mechanical response from actuating materials that are used for conversion of heat or light into mechanical motion. As the limits in the response times of polymer-based actuating materials are reached, which are inherent to the less-than-optimal coupling between the light/heat and mechanical energy in them, a conceptually new approach to mechanical actuation is required to leapfrog the performance of organic actuators. Herein, we explore single crystals of 1,2,4,5-tetrabromobenzene (TBB) as actuating elements and establish relations between their kinematic profile and mechanical properties. Centimeter-size acicular crystals of TBB are the only naturally twinned crystals out of about a dozen known materials that exhibit the thermosalient effect - an extremely rare and visually impressive crystal locomotion. When taken over a phase transition, crystals of this material store mechanical strain and are rapidly self-actuated to sudden jumps to release the internal strain, leaping up to several centimeters. To establish the structural basis for this colossal crystal motility, we investigated the mechanical profile of the crystals from macroscale, in response to externally induced deformation under microscope, to nanoscale, by using nanoindentation. Kinematic analysis based on high-speed recordings of over 200 twinned TBB crystals exposed to directional or nondirectional heating unraveled that the crystal locomotion is a kinematically complex phenomenon that includes at least six kinematic effects. The nanoscale tests confirm the highly elastic nature, with an elastic deformation recovery (60%) that is far superior to those of molecular crystals reported earlier. This property appears to be critical for accumulation of stress required for crystal jumping. Twinned crystals of TBB exposed to moderate directional heating behave as all-organic analogue of a bimetallic strip, where the lattice misfit between the two crystal components drives reversible deformation of the crystal.
dc.publisherAmerican Chemical Society
dc.sourceJournal of the American Chemical Society
dc.subjectKeywords: Actuating elements; Crystal components; High-speed recording; Mechanical actuations; Mechanical energies; Mechanical motions; Mechanical response; Reversible deformation; Deformation; Kinematics; Mechanical properties; Molecular crystals; Nanotechnology;
dc.titleKinematic and mechanical profile of the self-actuation of thermosalient crystal twins of 1,2,4,5-tetrabromobenzene: A molecular crystalline analogue of a bimetallic strip
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume135
dc.date.issued2013
local.identifier.absfor091200 - MATERIALS ENGINEERING
local.identifier.ariespublicationU3488905xPUB1277
local.type.statusPublished Version
local.contributor.affiliationSahoo, Subash, New York University
local.contributor.affiliationSinha, Shashi, Indian Institute of Science Education and Research
local.contributor.affiliationMangalampalli, S.R.N. Kiran, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationRamamurty, U, Indian Institute of Science
local.contributor.affiliationDericioglu, Arcan F, Middle East Technical University
local.contributor.affiliationReddy, C Malla, Indian Institute of Science Education and Research
local.contributor.affiliationNaumov, Pance, New York University Abu Dhabi
local.description.embargo2037-12-31
local.bibliographicCitation.issue37
local.bibliographicCitation.startpage13843
local.bibliographicCitation.lastpage13850
local.identifier.doi10.1021/ja4056323
dc.date.updated2016-02-24T09:58:33Z
local.identifier.scopusID2-s2.0-84884294895
local.identifier.thomsonID000330163000037
CollectionsANU Research Publications

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