Hofmeister effects on the colloidal stability of poly(ethylene glycol)-decorated nanoparticles

被引：0
作者：
Leandro S. Blachechen
Jaqueline O. Silva
Leandro R. S. Barbosa
Rosangela Itri
Denise F. S. Petri
机构：
[1] Universidade de São Paulo,Instituto de Química
[2] Universidade de São Paulo,Instituto de Física
来源：
Colloid and Polymer Science | 2012年 / 290卷
关键词：
Colloidal stability; Surface tension; SAXS; Hofmeister series ions; Poly(ethylene glycol); Latex particle;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
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.
引用
收藏
页码：1537 / 1546
页数：9
相关论文
共 128 条
  • [1] Hofmeister F(1888)Zur Lehre von der Wirkung der Salze Arch Exp Pathol Pharmakol 24 247-260
  • [2] Cacace MG(1997)The Hofmeister series: salt and solvent effects on interfacial phenomena Quat Rev Biophys 30 241-277
  • [3] Landau EM(2002)Monolayers, bilayers and micelles of zwitterionic lipids as model systems for the study of specific anion effects Curr Opin Colloid Interface Sci 7 81-91
  • [4] Ramsden JJ(2004)The present state of affairs with Hofmeister effects Curr Opin Colloid Interface Sci 9 1-18
  • [5] Leontidis E(2006)Interactions between macromolecules and ions: the Hofmeister series Curr Opin Chem Biol 10 658-663
  • [6] Kunz W(2005)Specific ion effects on the water solubility of macromolecules: PNIPAM and the Hofmeister series J Am Chem Soc 127 14505-14510
  • [7] Lo Nostro P(2006)Salt screening and specific ion adsorption determine neutral-lipid membrane interactions Proc Natl Acad Sci 103 7982-7987
  • [8] Ninham BW(2011)Ion specificity and the theory of stability of colloidal suspensions Phys Rev Lett PRL 106 167801-167804
  • [9] Zhang Y(2007)On possible microscopic origins of the swelling of neutral lipid bilayers induced by simple salts J Colloid Interface Sci 309 56-67
  • [10] Cremer PS(2011)Poly(ethylene glycol) decorated poly(methylmethacrylate) nanoparticles for protein adsorption Mater Sci Eng C Biomim Mater Sensors Syst 31 562-566
12345678910