INVESTIGADORES
TAGLIAZUCCHI Mario Eugenio
artículos
Título:
Kinetically Controlled Self-Assembly of Latex?Microgel Core?Satellite Particles
Autor/es:
MARIO TAGLIAZUCCHI; FENGWEI ZHOU; EMILY A. WEISS
Revista:
The Journal of Physical Chemistry Letters
Editorial:
American Chemical Society
Referencias:
Lugar: Washington; Año: 2014 vol. 5 p. 2775 - 2780
ISSN:
1948-7185
Resumen:
Latex?microgel core?satellite particles were prepared by electrostatic
assembly of negatively charged polystyrene latex and positively charged
microgels of a poly(N-isopropylmethacrylamide) (pNIPMAM) and
poly[2-methacryloyloxy)ethyl] trimethylammonium chloride (pMETAC)
copolymer. The number of satellites per core, determined by scanning
electron microscopy, varied from 3 to 10 depending on the sizes of the
microgel and latex microparticles. The numbers of satellites per core
for different size ratios were compared with the predictions for
thermodynamically controlled (maximum packing) and kinetically
controlled (random sequential adsorption) assembly, and it was shown
that the assembly of latex and microgel proceeds through a random
sequential adsorption mechanism. The charges of the microgels and latex
particles were retained within the assemblies; therefore, the
core?satellite particles have well-defined regions of positive and
negative charge. These regions were used to direct the adsorption of
gold and latex nanoparticles of opposite charge in order to create
multicomponent colloids.