Quantification of Photoinduced Bending of Dynamic Molecular Crystals: From Macroscopic Strain to Kinetic Constants and Activation Energies Full article
| Journal |
Chemical Science
ISSN: 2041-6520 , E-ISSN: 2041-6539 |
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| Output data | Year: 2018, Volume: 9, Number: 8, Pages: 2319-2335 Pages count : 17 DOI: 10.1039/c7sc04863g | ||||||
| Tags | Activation energy; Actuators; Crystal structure; Kinematics; Kinetics; Liquid crystals; Mathematical transformations; Mechanical actuators; Molecular crystals; Photochemical reactions; Rate constants; Temperature distribution | ||||||
| Authors |
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| Affiliations |
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Funding (3)
| 1 | Federal Agency for Scientific Organizations | 0301-2016-0014 (АААА-А17-117030310274-5) |
| 2 | Federal Agency for Scientific Organizations | 0301-2016-0020 |
| 3 | New York University Abu Dhabi |
Abstract:
Photomechanically reconfigurable elastic single crystals are the key elements for contactless, timely controllable and spatially resolved transduction of light into work from the nanoscale to the macroscale. The deformation in such single-crystal actuators is observed and usually attributed to anisotropy in their structure induced by the external stimulus. Yet, the actual intrinsic and external factors that affect the mechanical response remain poorly understood, and the lack of rigorous models stands as the main impediment towards benchmarking of these materials against each other and with much better developed soft actuators based on polymers, liquid crystals and elastomers. Here, experimental approaches for precise measurement of macroscopic strain in a single crystal bent by means of a solid-state transformation induced by light are developed and used to extract the related temperature-dependent kinetic parameters. The experimental results are compared against an overarching mathematical model based on the combined consideration of light transport, chemical transformation and elastic deformation that does not require fitting of any empirical information. It is demonstrated that for a thermally reversible photoreactive bending crystal, the kinetic constants of the forward (photochemical) reaction and the reverse (thermal) reaction, as well as their temperature dependence, can be extracted with high accuracy. The improved kinematic model of crystal bending takes into account the feedback effect, which is often neglected but becomes increasingly important at the late stages of the photochemical reaction in a single crystal. The results provide the most rigorous and exact mathematical description of photoinduced bending of a single crystal to date.
Cite:
Chizhik S.
, Sidelnikov A.
, Zakharov B.
, Naumov P.
, Boldyreva E.
Quantification of Photoinduced Bending of Dynamic Molecular Crystals: From Macroscopic Strain to Kinetic Constants and Activation Energies
Chemical Science. 2018.
V.9. N8. P.2319-2335. DOI: 10.1039/c7sc04863g
WOS
Scopus
РИНЦ
AN
OpenAlex
Quantification of Photoinduced Bending of Dynamic Molecular Crystals: From Macroscopic Strain to Kinetic Constants and Activation Energies
Chemical Science. 2018.
V.9. N8. P.2319-2335. DOI: 10.1039/c7sc04863g
WOS
Scopus
РИНЦ
AN
OpenAlex
Files:
Full text from publisher
Dates:
| Submitted: | Nov 11, 2017 |
| Accepted: | Jan 19, 2018 |
| Published online: | Jan 22, 2018 |
Identifiers:
| Web of science: | WOS:000427091500029 |
| Scopus: | 2-s2.0-85042598867 |
| Elibrary: | 35506169 |
| Chemical Abstracts: | 2018:139732 |
| OpenAlex: | W2784407351 |