Dynamics and Stability of Dispersions of Polyelectrolyte-Filled Multilayer Microcapsulesстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:The authors report dynamic and coagulation properties of a dispersion of polyelectrolyte multilayer
microcapsules filled with solutions of a strong polyelectrolyte. Microcapsules are shown to take a
charge of the sign of encapsulated polyions and are characterized by a nonuniform distribution of
inner polyions, which indicates a semipermeability of the shell and a leakage of counterions. The
capsule self-diffusion coefficient in the vicinity of the similarly charged wall is measured using a
particle tracking procedure from confocal images of the dispersion. The diffusion of capsules in the
force field suggests that the effective interaction potential contains an electrostatic barrier, so that we
deal with the same types of interaction forces as for solid particles. The theoretical estimates of the
authors show that when microcapsules are in close proximity, their interaction should even be
quantitatively the same as that of colloids with the same surface potential. However, due to the
mobility of inner polyions they might repel stronger at large distances. The authors thus conclude
that the encapsulation of charged polymers is an important factor in determining the adhesion and
interaction properties of multilayer microcapsules.