Low-temperature dynamical transition in polymeric aqueous environments
The occurrence of a dynamical transition at low-temperature has been reported in a large number of different proteins and even in hydrated amino acids mixture. However, we recently observed a "protein-like" dynamical transition also in a non-biological aqueous environment made by poly-N-isopropylacrylamide (PNIPAM) microgels. By means of elastic incoherent neutron scattering and quasielastic neutron scattering we aim to exploit PNIPAM-based systems to investigate the nature of such a transition. In particular, we want to ascertain whether this phenomenon is intimately related to the complex internal architecture of microgels or if it can be generalized to other polymeric architectures, such as hydrogels, i.e. macroscopic gels, and/or suspensions of individual chains. These results can extend the concept of a low temperature dynamical transition and shed new light to this widely debated phenomenon.
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M. Zanatta; BERTOLDO Monica; BURATTI Elena; NATALI Francesca; OLLIVIER Jacques; ORECCHINI Andrea; RUIZ FRANCO Jose Manuel; TAVAGNACCO Letizia and ZACCARELLI Emanuela. (2018). Low-temperature dynamical transition in polymeric aqueous environments. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-11-1866
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