Anion-specific effects on the behavior of pH-sensitive polybasic brushes

Langmuir : the ACS Journal of Surfaces and Colloids
Joshua D WillottGrant B Webber

Abstract

The anion-specific solvation and conformational behavior of weakly basic poly(2-dimethylamino)ethyl methacrylate (poly(DMA)), poly(2-diethylamino)ethyl methacrylate (poly(DEA)), and poly(2-diisopropylamino)ethyl methacrylate (poly(DPA)) brushes, with correspondingly increasing inherent hydrophobicity, have been investigated using in situ ellipsometric and quartz crystal microbalance with dissipation (QCM-D) measurements. In the osmotic brush regime, as the initial low concentration of salt is increased, the brushes osmotically swell by the uptake of solvent as they become charged and the attractive hydrophobic inter- and intrachain interactions are overcome. With increased ionic strength, the brushes move into the salted brush regime where they desolvate and collapse as their electrostatic charge is screened. Here, as the brushes collapse, they transition to more uniform and rigid conformations, which dissipate less energy, than similarly solvated brushes at lower ionic strength. Significantly, in these distinct regimes brush behavior is not only ionic strength dependent but is also influenced by the nature of the added salt based on its position in the well-known Hofmeister or lyotropic series, with potassium acetate, nitrate,...Continue Reading

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Citations

Feb 4, 2016·Physical Chemistry Chemical Physics : PCCP·Ben A HumphreysErica J Wanless
Nov 17, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Marc ThomasNils Hartmann
Sep 12, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Ran KouGuangming Liu
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Apr 16, 2020·Soft Matter·Haiyang Yuan, Guangming Liu
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Feb 24, 2018·Macromolecules·Joshua D WillottWiebe M de Vos
Sep 18, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Jian ZhangGuangming Liu
Aug 9, 2018·The Journal of Physical Chemistry. B·Renwei ZhuGuangming Liu
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Oct 28, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Edwin C JohnsonErica J Wanless
Jul 18, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Yuji HigakiAtsushi Takahara
May 22, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Bintao ZhaoJiang Zhao
Feb 19, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Koosha EhtiatiEsben Thormann
May 29, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Guangming Liu

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