Artículos de revistas
PVP superabsorbent nanogels
Fecha
2009Registro en:
COLLOID AND POLYMER SCIENCE, v.287, n.6, p.705-713, 2009
0303-402X
10.1007/s00396-009-2017-0
Autor
BUENO, Vania B.
Cuccovia, Iolanda Midea
Guralnik, Hernan Chaimovich
CATALANI, Luiz H.
Institución
Resumen
Monomer free hydrogel nanoparticles (nanogels) were prepared by crosslinking preformed poly(N-vinyl-2-pyrrolidone) (PVP) entrapped in the aqueous pool of hexadecyltrimethylammonium bromide reverse micelles using the Fenton reaction. The PVP nanoparticles were spherical with a dry diameter of 27 nm. The diameter of the swollen particles was ten times higher, i.e., a swelling ratio, Q, above 900, characterizing this preparation as superabsorbent. PVP nanogel swelling was dependent on bound Fe(3+) and varied with pH and ionic strength. Nanogel deswelling by salt followed the anions lyotropic series, i.e., SCN(-) < HSO(3)(-) < NO(3)(-) < I(-) < Cl(-) < CH(3)COO(-) < CF(3)SO(3)(-). The value of Q reached 6,000 in iron-free PVP nanoparticles at low pH, making this nanogel one of the most efficient swelling systems so far described.