Influence of pH on the aggregation morphology of a novel surfactant with single hydrocarbon chain and multi-amine headgroups

The Journal of Physical Chemistry. B
Wei WangLong Jiang

Abstract

A novel single-chain surfactant with multi-amine headgroups, bis(amidoethyl-carbamoylethyl) octadecylamine (C18N3), was synthesized. Electronmicrographic study showed that in aqueous solution C18N3 formed small micelles (10-20 nm in diameter) at pH 2.0 and changed into much larger globule vesicles sized about 0.6-2.0 microm in diameter at pH 6.8. At pH 12.0 vesicles changed to a much larger continued lyotropic lamella structure. At pH = 2, the surface tension (gamma)-concentration (C) curve at pH 2 was an ordinary one, having one critical micelle concentration at 2.9 x 10(-3) mol L(-1) at relatively high surface tension (52 mN m(-1)). However, two unique transition points were observed in the gamma-C plot at pH = 6.8 and 10.5, showing higher surface activity that is believed to be associated with the micelle-bilayer structure transition. The protonation degree pKa's of the three amine headgroups were found to be 6.6, 10.6, and 10.9, respectively, indicating that a complete protonation state of the headgroups occurred at pH 2.0, which is consistent with the apparent surface areas of headgroup calculated according to Gibbs adsorption isotherm. Variation of sizes and morphologies of C18N3 in aqueous solution at different pH values...Continue Reading

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Citations

Jun 30, 2012·Chemosphere·Magdalena Piętka-OttlikKazimiera A Wilk
Feb 2, 2017·The Journal of Physical Chemistry. B·Changrui GaoMichael J Bedzyk
Aug 18, 2010·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Xuefeng LiJinfeng Dong
Aug 31, 2010·Electrophoresis·Shaohua LiLong Jiang
Oct 20, 2019·Analytica Chimica Acta·Daniel G HorvathPaul Abbyad
Sep 9, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Salvador NavarroHenning Menzel
Apr 28, 2010·The Journal of Physical Chemistry. B·Shengchi ZhuoJianwen Jiang
Jan 1, 2009·The Journal of Physical Chemistry. B·Anna KoganMaria Francesca Ottaviani
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Jun 12, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·Aurora ColomerAurora Pinazo
Feb 6, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Yoshiro ImuraTakeshi Kawai
Apr 17, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·Zan JiangJinfeng Dong
Nov 21, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·Amalia MezeiRamon Pons
Dec 13, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Tomokazu YoshimuraHiroki Iwase

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