Abstract
| Original language | English |
|---|---|
| Article number | 1802032 |
| Number of pages | 7 |
| Journal | Advanced Materials Interfaces |
| Volume | 6 |
| Issue number | 9 |
| Early online date | 8 Apr 2019 |
| DOIs | |
| Publication status | Published - May 2019 |
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Keywords
- Azo
- liquid crystals
- photoresponse
- rheology
- soft matter
Cite this
Fast-and-Giant Photorheological Effect in a Liquid Crystal Dimer. / Aya, Satoshi; Salamon, Péter; Paterson, Daniel A.; Storey, John M. D.; Imrie, Corrie T.; Araoka, Fumito (Corresponding Author); Jákli, Antal (Corresponding Author); Buka, Ágnes.
In: Advanced Materials Interfaces, Vol. 6, No. 9, 1802032, 05.2019.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Fast-and-Giant Photorheological Effect in a Liquid Crystal Dimer
AU - Aya, Satoshi
AU - Salamon, Péter
AU - Paterson, Daniel A.
AU - Storey, John M. D.
AU - Imrie, Corrie T.
AU - Araoka, Fumito
AU - Jákli, Antal
AU - Buka, Ágnes
N1 - This work was supported by the HAS-JSPS bilateral joint research project. Financial support from the grants NKFIH PD 121019 and FK 125134 was acknowledged. The authors thank Professor Alexey Eremin (Otto von Guericke University of Magdeburg) for valuable discussions.
PY - 2019/5
Y1 - 2019/5
N2 - Mechanically responsive organic materials can change their viscoelastic properties in response to external stimuli. However, materials that exhibit highly contrasting viscoelastic properties coupled with fast and reversible switching between the states involved have remained elusive. Here, it is shown that a nonsymmetric photoresponsive liquid crystal dimer exhibits photoswitching of its viscoelastic properties (shear viscosity, storage, and loss moduli) with remarkable contrast of up to 106 while transitioning between crystal and nematic phases. This switching is reversible and takes less than 100 s for both forward (trans-cis photoisomerization) and backward (cis-trans photoisomerization) reactions due to the coexistence of two allotropes containing two types of stereoisomers. This combination of highly contrasting viscoelastic behavior with fast and reversible switching establishes a whole new performance level for mechanically responsive organic materials and offers very considerable application potential in such diverse areas as photoswitchable adhesives, in vibration control, and as novel brakes.
AB - Mechanically responsive organic materials can change their viscoelastic properties in response to external stimuli. However, materials that exhibit highly contrasting viscoelastic properties coupled with fast and reversible switching between the states involved have remained elusive. Here, it is shown that a nonsymmetric photoresponsive liquid crystal dimer exhibits photoswitching of its viscoelastic properties (shear viscosity, storage, and loss moduli) with remarkable contrast of up to 106 while transitioning between crystal and nematic phases. This switching is reversible and takes less than 100 s for both forward (trans-cis photoisomerization) and backward (cis-trans photoisomerization) reactions due to the coexistence of two allotropes containing two types of stereoisomers. This combination of highly contrasting viscoelastic behavior with fast and reversible switching establishes a whole new performance level for mechanically responsive organic materials and offers very considerable application potential in such diverse areas as photoswitchable adhesives, in vibration control, and as novel brakes.
KW - Azo
KW - liquid crystals
KW - photoresponse
KW - rheology
KW - soft matter
UR - http://www.mendeley.com/research/fastandgiant-photorheological-effect-liquid-crystal-dimer
U2 - 10.1002/admi.201802032
DO - 10.1002/admi.201802032
M3 - Article
VL - 6
JO - Advanced Materials Interfaces
JF - Advanced Materials Interfaces
SN - 2196-7350
IS - 9
M1 - 1802032
ER -