The whole process of phase transition and relaxation of poly(N-isopropylacrylamide) aqueous solution

Literature Information

Publication Date 2013-01-21
DOI 10.1039/C3CP43309A
Impact Factor 3.676
Authors

Hayato Inoue, Shota Kuwahara, Kenji Katayama


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Abstract

We observed the whole dynamics from the phase transition to the molecular relaxation of a poly(N-isopropylacrylamide) (PNIPAM) aqueous solution using the heterodyne transient grating (HD-TG) method combined with the laser temperature-jump technique. The initial phase transition corresponding to coil to globule conformational transition occurred with a time constant of 96 ± 7 μs. Then, the globule molecules aggregated due to hydrophobic interaction, and the size of the aggregates increased sufficiently to scatter light (11 ± 1 ms) when the temperature achieved by heating was high enough to exceed the phase transition temperature. The aggregates loosened due to thermal diffusion with a time constant of 44 ± 5 ms. Even after that, the released globule molecules returned back to the coil state with a lifetime of 1.5–5 s, as we reported in a previous paper (H. Inoue et al., Phys. Chem. Chem. Phys., 2012, 14, 5620–5627).

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
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Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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