Interaction of charged particles, induced by adding an oppositely charged polyion, gives rise to intriguing aggregation phenomena. The presence of short-range interactions in competition with electrostatic repulsions results, in an interval of concentrations around the inversion point, in the formations of long-lived clusters of polyelectrolyte-decorated particles. We will show that the whole aggregation scenario can be justified as due to an heterogeneous charge distribution at the particle surface, as a consequence of the correlated polyion adsorption, on the basis of a recently model proposed by D. Velegol, R Thwar, Langmuir 17 (2001) 7687-7693. (C) 2009 Elsevier B.V. All rights reserved.
Colloidal particle aggregates induced by particle surface charge heterogeneity / Sennato, Simona; Truzzolillo, Domenico; Bordi, Federico; Sciortino, Francesco; Cametti, Cesare. - In: COLLOIDS AND SURFACES. A, PHYSICOCHEMICAL AND ENGINEERING ASPECTS. - ISSN 0927-7757. - 343:1-3(2009), pp. 34-42. (Intervento presentato al convegno 22nd Conference of the European-Colloid-and-Interface-Society tenutosi a Cracow, POLAND nel AUG 31-SEP 05, 2008) [10.1016/j.colsurfa.2009.01.026].
Colloidal particle aggregates induced by particle surface charge heterogeneity
SENNATO, Simona;TRUZZOLILLO, DOMENICO;BORDI, FEDERICO;SCIORTINO, Francesco;CAMETTI, Cesare
2009
Abstract
Interaction of charged particles, induced by adding an oppositely charged polyion, gives rise to intriguing aggregation phenomena. The presence of short-range interactions in competition with electrostatic repulsions results, in an interval of concentrations around the inversion point, in the formations of long-lived clusters of polyelectrolyte-decorated particles. We will show that the whole aggregation scenario can be justified as due to an heterogeneous charge distribution at the particle surface, as a consequence of the correlated polyion adsorption, on the basis of a recently model proposed by D. Velegol, R Thwar, Langmuir 17 (2001) 7687-7693. (C) 2009 Elsevier B.V. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
