Microgel particles composed of Interpenetrated Polymer Network (IPN) of poly(N-isopropylacrylamide) (PNIPAM) and poly(acrylic acid) (PAAc) dispersed in water have been investigated through dynamic light scattering. The study of the temperature, concentration and pH dependence of the relaxation time has highlighted the existence of a thermoreversible transition corresponding to the swollen-shrunken volume phase transition. The presence of PAAc introduces an additional pH-sensitivity with respect to the temperature-sensitivity due to PNIPAM and leads to interesting differences in the transition process at acid and neutral pH.

Dynamic light scattering study of temperature and pH sensitive colloidal microgels / Nigro, Valentina; Angelini, Roberta; Bertoldo, Monica; Castelvetro, Valter; Ruocco, Giancarlo; Ruzicka, Barbara. - In: JOURNAL OF NON-CRYSTALLINE SOLIDS. - ISSN 0022-3093. - STAMPA. - 407:(2015), pp. 361-366. [10.1016/j.jnoncrysol.2014.08.039]

Dynamic light scattering study of temperature and pH sensitive colloidal microgels

NIGRO, VALENTINA
;
ANGELINI, ROBERTA;RUOCCO, Giancarlo;RUZICKA, BARBARA
2015

Abstract

Microgel particles composed of Interpenetrated Polymer Network (IPN) of poly(N-isopropylacrylamide) (PNIPAM) and poly(acrylic acid) (PAAc) dispersed in water have been investigated through dynamic light scattering. The study of the temperature, concentration and pH dependence of the relaxation time has highlighted the existence of a thermoreversible transition corresponding to the swollen-shrunken volume phase transition. The presence of PAAc introduces an additional pH-sensitivity with respect to the temperature-sensitivity due to PNIPAM and leads to interesting differences in the transition process at acid and neutral pH.
2015
colloidal dispersions; dynamic light scattering; microgels; relaxation dynamics; condensed matter physics; ceramics and composites; electronic, optical and magnetic materials; materials chemistry2506 metals and alloys
01 Pubblicazione su rivista::01a Articolo in rivista
Dynamic light scattering study of temperature and pH sensitive colloidal microgels / Nigro, Valentina; Angelini, Roberta; Bertoldo, Monica; Castelvetro, Valter; Ruocco, Giancarlo; Ruzicka, Barbara. - In: JOURNAL OF NON-CRYSTALLINE SOLIDS. - ISSN 0022-3093. - STAMPA. - 407:(2015), pp. 361-366. [10.1016/j.jnoncrysol.2014.08.039]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/843021
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