Journal of Chemical Physics, volume 152, issue 2, pages 24904

Kinetics of photo-isomerization of azobenzene containing surfactants.

Arya Pooja 1
Jelken Joachim 1
Lomadze Nino 1
Santer Svetlana 1
Bekir Marek 1
1
 
Institute of Physics and Astronomy, University of Potsdam , 14476 Potsdam, Germany
Publication typeJournal Article
Publication date2020-01-10
Quartile SCImago
Q1
Quartile WOS
Q1
Impact factor4.4
ISSN00219606, 10897690
Physical and Theoretical Chemistry
General Physics and Astronomy
Abstract

We report on photoisomerization kinetics of azobenzene containing surfactants in aqueous solution. The surfactant molecule consists of a positively charged trimethylammonium bromide head group, a hydrophobic spacer connecting via 6 to 10 CH2 groups to the azobenzene unit, and the hydrophobic tail of 1 and 3CH2 groups. Under exposure to light, the azobenzene photoisomerizes from more stable trans- to metastable cis-state, which can be switched back either thermally in dark or by illumination with light of a longer wavelength. The surfactant isomerization is described by a kinetic model of a pseudo first order reaction approaching equilibrium, where the intensity controls the rate of isomerization until the equilibrated state. The rate constants of the trans-cis and cis-trans photoisomerization are calculated as a function of several parameters such as wavelength and intensity of light, the surfactant concentration, and the length of the hydrophobic tail. The thermal relaxation rate from cis- to trans-state is studied as well. The surfactant isomerization shows a different kinetic below and above the critical micellar concentration of the trans isomer due to steric hindrance within the densely packed micelle but does not depend on the spacer length.

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Arya P. et al. Kinetics of photo-isomerization of azobenzene containing surfactants. // Journal of Chemical Physics. 2020. Vol. 152. No. 2. p. 24904.
GOST all authors (up to 50) Copy
Arya P., Jelken J., Lomadze N., Santer S., Bekir M. Kinetics of photo-isomerization of azobenzene containing surfactants. // Journal of Chemical Physics. 2020. Vol. 152. No. 2. p. 24904.
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TY - JOUR
DO - 10.1063/1.5135913
UR - https://doi.org/10.1063%2F1.5135913
TI - Kinetics of photo-isomerization of azobenzene containing surfactants.
T2 - Journal of Chemical Physics
AU - Arya, Pooja
AU - Jelken, Joachim
AU - Lomadze, Nino
AU - Santer, Svetlana
AU - Bekir, Marek
PY - 2020
DA - 2020/01/10 00:00:00
PB - American Institute of Physics (AIP)
SP - 24904
IS - 2
VL - 152
SN - 0021-9606
SN - 1089-7690
ER -
BibTex |
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BibTex Copy
@article{2020_Arya
author = {Pooja Arya and Joachim Jelken and Nino Lomadze and Svetlana Santer and Marek Bekir},
title = {Kinetics of photo-isomerization of azobenzene containing surfactants.},
journal = {Journal of Chemical Physics},
year = {2020},
volume = {152},
publisher = {American Institute of Physics (AIP)},
month = {jan},
url = {https://doi.org/10.1063%2F1.5135913},
number = {2},
pages = {24904},
doi = {10.1063/1.5135913}
}
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Arya, Pooja, et al. “Kinetics of photo-isomerization of azobenzene containing surfactants..” Journal of Chemical Physics, vol. 152, no. 2, Jan. 2020, p. 24904. https://doi.org/10.1063%2F1.5135913.
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