Kinetics of photo-isomerization of azobenzene containing surfactants
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...
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Veröffentlicht in: | The Journal of chemical physics 2020-01, Vol.152 (2), p.024904-024904 |
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creator | Arya, Pooja Jelken, Joachim Lomadze, Nino Santer, Svetlana Bekir, Marek |
description | 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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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. 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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.</description><subject>Aqueous solutions</subject><subject>Hydrophobicity</subject><subject>Isomerization</subject><subject>Light</subject><subject>Luminous intensity</subject><subject>Micelles</subject><subject>Physics</subject><subject>Rate constants</subject><subject>Reaction kinetics</subject><subject>Steric hindrance</subject><subject>Surfactants</subject><subject>Thermal relaxation</subject><issn>0021-9606</issn><issn>1089-7690</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><recordid>eNp90E1LAzEQBuAgiq3Vg39ACl5U2JpJNsnmKPUTC170vGSzWU1pk5pkBfvr3dqqIOhpYObhZXgROgQ8AszpOYwYUCaBbqE-4EJmgku8jfoYE8gkx7yH9mKcYoxBkHwX9SjIHCiFPrq8t84kq-PQN8PFi08-s9HPTbBLlax3q7Va-sq4pXFmqL1LyjrrnoexDY3SSbkU99FOo2bRHGzmAD1dXz2Ob7PJw83d-GKSaVrQlOW6MBwazCsOnENOGVSikLWWuOYqZ5qDLOpGV4YJRgoCohDdkZhCsUawmg7QyTp3Efxra2Iq5zZqM5spZ3wbS0KpFJIIQTp6_ItOfRtc991KsQ5ywjt1ulY6-BiDacpFsHMV3kvA5araEspNtZ092iS21dzU3_Kryw6crUHUNn2W92_an_jNhx9YLuqGfgAm4I43</recordid><startdate>20200114</startdate><enddate>20200114</enddate><creator>Arya, Pooja</creator><creator>Jelken, Joachim</creator><creator>Lomadze, Nino</creator><creator>Santer, Svetlana</creator><creator>Bekir, Marek</creator><general>American Institute of Physics</general><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><scope>7X8</scope><orcidid>https://orcid.org/0000-0002-5041-3650</orcidid><orcidid>https://orcid.org/0000-0002-6989-9996</orcidid><orcidid>https://orcid.org/0000000269899996</orcidid><orcidid>https://orcid.org/0000000250413650</orcidid></search><sort><creationdate>20200114</creationdate><title>Kinetics of photo-isomerization of azobenzene containing surfactants</title><author>Arya, Pooja ; Jelken, Joachim ; Lomadze, Nino ; Santer, Svetlana ; Bekir, Marek</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c383t-4c8e61f06b616614351b789dc90d6a45c6198dfcbe5752821787dc92e8a5f75d3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>Aqueous solutions</topic><topic>Hydrophobicity</topic><topic>Isomerization</topic><topic>Light</topic><topic>Luminous intensity</topic><topic>Micelles</topic><topic>Physics</topic><topic>Rate constants</topic><topic>Reaction kinetics</topic><topic>Steric hindrance</topic><topic>Surfactants</topic><topic>Thermal relaxation</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Arya, Pooja</creatorcontrib><creatorcontrib>Jelken, Joachim</creatorcontrib><creatorcontrib>Lomadze, Nino</creatorcontrib><creatorcontrib>Santer, Svetlana</creatorcontrib><creatorcontrib>Bekir, Marek</creatorcontrib><collection>PubMed</collection><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>MEDLINE - Academic</collection><jtitle>The Journal of chemical physics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Arya, Pooja</au><au>Jelken, Joachim</au><au>Lomadze, Nino</au><au>Santer, Svetlana</au><au>Bekir, Marek</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Kinetics of photo-isomerization of azobenzene containing surfactants</atitle><jtitle>The Journal of chemical physics</jtitle><addtitle>J Chem Phys</addtitle><date>2020-01-14</date><risdate>2020</risdate><volume>152</volume><issue>2</issue><spage>024904</spage><epage>024904</epage><pages>024904-024904</pages><issn>0021-9606</issn><eissn>1089-7690</eissn><coden>JCPSA6</coden><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. 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source | AIP Journals Complete; Alma/SFX Local Collection |
subjects | Aqueous solutions Hydrophobicity Isomerization Light Luminous intensity Micelles Physics Rate constants Reaction kinetics Steric hindrance Surfactants Thermal relaxation |
title | Kinetics of photo-isomerization of azobenzene containing surfactants |
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