Polymeric nanoparticles stabilized by surfactants: kinetic studies

0361350 - ÚMCH 2012 RIV US eng J - Journal Article
Pánek, Jiří - Filippov, Sergey K. - Koňák, Čestmír - Steinhart, Miloš - Štěpánek, Petr
Polymeric nanoparticles stabilized by surfactants: kinetic studies.
Journal of Dispersion Science and Technology. Roč. 32, č. 8 (2011), s. 1105-1110. ISSN 0193-2691. E-ISSN 1532-2351
R&D Projects: GA ČR GAP208/10/1600
Institutional research plan: CEZ:AV0Z40500505
Keywords : nanoparticles * solvent shifting * time-resolved SAXS
Subject RIV: CF - Physical ; Theoretical Chemistry
Impact factor: 0.560, year: 2011

A kinetic study was carried out to monitor the time-dependent formation of surfactant-stabilized polymeric nanoparticles prepared by controlled phase separation. The nanoparticles were made of poly(methylmethacrylate) or polystyrene and several ionic and nonionic surfactants. The dispersion was prepared by fast mixing a solution of the polymers in organic solvents with a solution of a surfactant in water. We observed the formation of well-defined nanoparticles measured by time-resolved small-angle x-ray scattering (TR-SAXS). Our results suggest that the kinetics for the formation of nanoparticles comprising ionic surfactants is much faster (in the range of milliseconds) than that for nanoparticles comprising nonionic surfactants (on the time scales of several seconds). We were able to observe the transformation of particle surface from transient structure to hard sphere one in real time. Some systems manifest a plethora of structural changes that demands further experimental research.
Permanent Link: http://hdl.handle.net/11104/0198681