Film-forming microgels for pH-triggered capture and release

Langmuir : the ACS Journal of Surfaces and Colloids
Paul A FitzgeraldErica J Wanless

Abstract

The pH-responsive behavior for a series of lightly cross-linked, sterically stabilized poly(tertiary amine methacrylate)-based latexes adsorbed onto mica and silica was investigated using in situ tapping mode AFM at room temperature. The adsorbed layer structure was primarily determined by the glass transition temperature, T(g), of the latex: poly[2-(diethylamino)ethyl methacrylate]-based particles coalesced to form relatively featureless uniform thin films, whereas the higher T(g) poly[2-(diisopropylamino)ethyl methacrylate] latexes retained their original particulate character. Adsorption was enhanced by using a cationic poly[2-(dimethylamino)ethyl methacrylate] steric stabilizer, rather than a nonionic poly(ethylene glycol)-based stabilizer, since the former led to stronger electrostatic binding to the oppositely charged substrate. Both types of adsorbed latexes acquired cationic microgel character and swelled appreciably at low pH, even those that had coalesced to form films. Fluorescence spectroscopy was used to study the capture of a model hydrophobic probe, pyrene, by these adsorbed latex layers followed by its subsequent release by lowering the solution pH. The repeated capture and release of pyrene through several pH c...Continue Reading

References

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Apr 24, 2007·Soft Matter·Paul A FitzGeraldErica J Wanless

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Citations

Jul 17, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·A J MorseR Swart
Jan 12, 2016·Biomacromolecules·Lina NyströmMartin Malmsten
Nov 19, 2010·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Anna BurmistrovaRegine von Klitzing
Aug 28, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Shaun C HowardErica J Wanless

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