Photoinduced demulsification of emulsions using a photoresponsive gemini surfactant

Langmuir : the ACS Journal of Surfaces and Colloids
Yutaka TakahashiPieter Stroeve

Abstract

This Article reports on the influence of light irradiation on the stability of emulsions prepared using a photoresponsive gemini surfactant (C7-azo-C7) having an azobenzene skeleton as a spacer. When mixtures of trans C7-azo-C7 aqueous solution and n-octane are homogenized, stable emulsions are obtained in a specific region of weight fraction and surfactant concentration. Fluorescence microscopy observations using a small amount of fluorescent probes show that the stable emulsions are oil-in-water (O/W)-type. UV irradiation of stable O/W emulsions promotes the cis isomerization of trans C7-azo-C7 and leads to the coalescence of the oil (octane) droplets in the emulsions, that is, demulsification. While the equilibrated interfacial tension (IFT) between aqueous trans C7-azo-C7 solution and octane is almost the same as that between aqueous cis C7-azo-C7 and octane, the occupied area per molecule for C7-azo-C7 at octane/water interface decreases with the cis photoisomerization of trans isomer. Dynamic IFT measurement shows that UV irradiation to the interface between aqueous trans C7-azo-C7 solution and octane brings about an increase in the interfacial tension, indicating that the Gibbs free energy at the interface increases. Fro...Continue Reading

References

Apr 5, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Julian EastoeRichard K Heenan
Jun 2, 2005·Chemical Communications : Chem Comm·Julian EastoeIsabelle Grillo
Feb 24, 2006·Langmuir : the ACS Journal of Surfaces and Colloids·Bernard P BinksSyuji Fujii
Mar 8, 2006·Langmuir : the ACS Journal of Surfaces and Colloids·Marco ScarzelloJan B F N Engberts
Jul 26, 2006·Langmuir : the ACS Journal of Surfaces and Colloids·Syuji FujiiRyo Murakami
Mar 27, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·Bradley A CicciarelliKenneth A Smith
Mar 27, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·F Pierce Hubbard, Nicholas L Abbott
Jul 10, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·Bradley A CicciarelliKenneth A Smith
Apr 25, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Chang LinYuanFa Liu
Aug 12, 2009·Journal of Colloid and Interface Science·Xiaoyang Liu, Nicholas L Abbott
Feb 4, 2010·Journal of Oleo Science·Akiko MatsumotoYukishige Kondo
Feb 24, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Xianhua FengZhenghe Xu
Jan 20, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Atsutoshi MatsumuraMasahiko Abe
Apr 28, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·Angelika KlausWerner Kunz
Jun 1, 2012·Journal of Colloid and Interface Science·Yi YangXuefeng Li
Jul 6, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·Hao LiuZhen Tong
Jul 17, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·A J MorseR Swart
Jul 11, 2013·Journal of Colloid and Interface Science·Yutaka TakahashiYukishige Kondo

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Citations

Jan 6, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·Yutaka TakahashiYukishige Kondo
Mar 2, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·Reidar LundChristophe Tribet
Mar 30, 2016·Lab on a Chip·Petra DunkelAbdel I El Abed
Jul 22, 2016·Journal of Colloid and Interface Science·Peipei XuDejun Sun
Jul 13, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·Yutaka TakahashiYukishige Kondo
Dec 14, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·Yuandi ZhangZhirong Qin
Feb 2, 2017·Chemical Communications : Chem Comm·Sho KanekoTaisuke Banno
Mar 11, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Gaihuan RenDejun Sun
May 10, 2017·Soft Matter·Dongfang LiuHongsheng Lu
Jan 26, 2017·Physical Chemistry Chemical Physics : PCCP·Pan WangJun Zhang
Oct 1, 2019·Macromolecular Rapid Communications·Florent JasinskiPer B Zetterlund
Aug 10, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Serena SeshadriMatthew E Helgeson
Sep 6, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Kangle JiaBing Liao
Mar 17, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Ye FanYinjun Fang
May 3, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Marco SchnurbusBjörn Braunschweig
Jul 25, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Lan LeiZhenggang Cui
Jul 11, 2020·The Journal of Physical Chemistry. B·Marco SchnurbusBjörn Braunschweig
Apr 18, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·An ChenJian-Hong Xu
May 9, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Huazhang GuoYong Gao
Jan 21, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Peiyao ZhuZhiyu Huang
Dec 8, 2021·ACS Applied Materials & Interfaces·Siddharth ThakurDipankar Bandyopadhyay

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