Tuning the fast dynamics of PNIPAM microgels through the use of biologically relevant co-solvents
PNIPAM microgels have been the subject of intense study for both academic research and technological applications, especially because of their remarkable thermoresponsiveness. Nevertheless, their picosecond dyanimcs at high concentrations remains largely unexplored. The only existing recent investigation on the dynamics of PNIPAM-based microgels in such high-concentration regime has revealed the presence of an interesting dynamic phenomenon on the picosecond scale. This effect, never observed before in these systems, interestingly resembles the so-called "dynamical transition" in proteins, where it is strictly related to the activation of biological functions. The role of the solvent interactions in driving the dynamical transition is particularly intriguing in this respect. Here we propose to deepen the understanding of the fast dynamics in PNIPAM microgels and focus on the effects of the solvent by adding to water a specific cosolvent, i.e. glycerol or DMSO, known for the ability to modulate bio-related dynamics in proteins.
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ROSI Benedetta Petra; COMEZ Lucia; COREZZI SILVIA; D'ANGELO Arianna; NATALI Francesca; ORECCHINI Andrea; Alessandro Paciaroni and PETERS Judith. (2019). Tuning the fast dynamics of PNIPAM microgels through the use of biologically relevant co-solvents. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-10-1570
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