Abstract
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 Fe3+ and varied with pH and ionic strength. Nanogel deswelling by salt followed the anions lyotropic series, i.e., \( {\text{SCN}}^{ - } < {\text{HSO}}^{ - }_{3} < {\text{NO}}^{ - }_{3} < {\text{I}}^{ - } < {\text{Cl}}^{ - } < {\text{CH}}_{3} {\text{COO}}^{ - } < {\text{CF}}_{3} {\text{SO}}^{ - }_{3} \). 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.
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We thank the Brazilian Agencies Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) and Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) for the financial support.
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Bueno, V.B., Cuccovia, I.M., Chaimovich, H. et al. PVP superabsorbent nanogels. Colloid Polym Sci 287, 705–713 (2009). https://doi.org/10.1007/s00396-009-2017-0
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DOI: https://doi.org/10.1007/s00396-009-2017-0