Abstract
The colloidal stability of poly(ethylene glycol)-decorated poly(methyl methacrylate), PMMA/Tween-20, particles was investigated by means of phase separation measurements, in the presence of sodium fluoride (NaF), sodium chloride, sodium bromide, sodium nitrate, or sodium thiocyanate (NaSCN) at 1.0 mol L−1. Following Hofmeister's series, the dispersions of PMMA/Tween-20 destabilized faster in the presence of NaF than with NaSCN. After the phase separation, the systems were homogenized and except for the dispersions in NaF, re-dispersed particles took longer to destabilize, indicating that anions adsorbed on the particles, creating a new surface. Except for F− ions, the adsorption of anions on the polar outmost shell was evidenced by means of tensiometry and small-angle X-ray scattering measurements. Fluoride ions induced the dehydration of the polar shell, without affecting the polar shell electron density, and the formation of very large aggregates. A model was proposed to explain the colloidal behavior in the presence of Hofmeister ions.
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Acknowledgments
The authors thank CNPq, CAPES and FAPESP (Grant # 2010/51219-4) for financial support. J.O.S. thanks Pró-Reitoria de Graduação da Universidade de São Paulo for the undergraduate stipend. The authors are also in debt with Prof. Paolo Mariani and Franceco Spinozzi, both from Università Politecnica delle Marche, Ancona, Italy, who provided us the GENFIT software.
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Blachechen, L.S., Silva, J.O., Barbosa, L.R.S. et al. Hofmeister effects on the colloidal stability of poly(ethylene glycol)-decorated nanoparticles. Colloid Polym Sci 290, 1537–1546 (2012). https://doi.org/10.1007/s00396-012-2684-0
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DOI: https://doi.org/10.1007/s00396-012-2684-0