Correlation between collective and molecular dynamics in pH-responsive cyclodextrin-based hydrogels
Autor: | Carlo Punta, Alessandro Gessini, Lucia Comez, Francesco D'Amico, Silvia Corezzi, Claudio Masciovecchio, Cettina Bottari, Andrea Pugliese, Andrea Mele, Lucio Melone, Barbara Rossi |
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Přispěvatelé: | Bottari, C., Comez, L., Corezzi, S., D'Amico, F., Gessini, A., Mele, A., Punta, C., Melone, L., Pugliese, A., Masciovecchio, C., Rossi, B. |
Jazyk: | angličtina |
Rok vydání: | 2017 |
Předmět: |
Materials science
General Physics and Astronomy 02 engineering and technology 010402 general chemistry 01 natural sciences Hydrophobic effect Molecular dynamics symbols.namesake Phase (matter) Cyclodextrin Physical and Theoretical Chemistry cyclodextrin hydrogels Raman Brillouin Hydrogels UV Raman Brillouin spectroscopy Raman chemistry.chemical_classification Brillouin Spectroscopy Brillouin Solvation Polymer 021001 nanoscience & nanotechnology 0104 chemical sciences Crystallography Hydrogel chemistry Chemical physics Self-healing hydrogels symbols 0210 nano-technology Raman spectroscopy |
Zdroj: | PCCP. Physical chemistry chemical physics 19 (2017): 22555–22563. doi:10.1039/c7cp04190j info:cnr-pdr/source/autori:Bottari C.; Comez L.; Corezzi S.; D'Amico F.; Gessini A.; Mele A.; Punta C.; Melone L.; Pugliese A.; Masciovecchio C.; Rossi B./titolo:Correlation between collective and molecular dynamics in pH-responsive cyclodextrin-based hydrogels/doi:10.1039%2Fc7cp04190j/rivista:PCCP. Physical chemistry chemical physics (Print)/anno:2017/pagina_da:22555/pagina_a:22563/intervallo_pagine:22555–22563/volume:19 |
Popis: | UV Raman and Brillouin light scattering (BLS) experiments have been used in this study to explore the complex phase change behavior occurring in pH-responsive polysaccharide hydrogels as a function of temperature. Due to the different physical quantities measured by the two techniques, the joint analysis of Raman and BLS spectra has provided an unprecedented large-scale characterization of the molecular rearrangements and of the different kinds of hydrophilic and hydrophobic interactions that cooperate to determine the phase transformation observed in these hydrogels during the heating of the gel. As the main result, the analysis of the Raman and BLS spectra showed the existence of a correlation between the local (molecular) and collective properties of the gels during the phase transformation undergone by the system, which is markedly triggered by pH. The joint set of experimental results suggests a model according to which the mechanism of pH dependence in the hydrogels under investigation is dominated by the interactions involving the hydrophobic parts of the polymer skeleton, whereas the solvation process observed under heating of the gels is driven by the progressive distancing of the polymer domains among them, as monitored by the Brillouin sound velocity. |
Databáze: | OpenAIRE |
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