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Deswelling microgel particles using hydrostatic pressure

Lietor-Santos, Juan-Jose ; Sierra-Martin, Benjamin ; Vavrin, Ronny ; Hu, Zhibing ; Gasser, Urs ; Fernandez-Nieves, Alberto

In: Macromolecules, 2009, vol. 42, no. 16, p. 6225–6230

We report on the use of hydrostatic pressure, P, to deswell thermosensitive poly(N-isopropylacrylamide) (pNIPAM) microgels and show that it can affect the polymer−solvent mixing as much as temperature, which is the traditional variable used to deswell pNIPAM particles. Interestingly, the microgel volume changes more gradually with pressure than it does with temperature. By comparing the...