A small-angle neutron scattering study of the ethyl (n-octyl) phosphate micelles in water

H. Hirata, S. Katayama, H. Okabayashi, M. Furusaka, T. Kawakatsu

研究成果: Article査読

4 被引用数 (Scopus)

抄録

Mixed-double chain anionic surfactants, barium- and lithium-salts of ethyl(n-octyl) phosphate (EOP), which are asymmetric in the molecular shape, and a series of identical chain di-n-alkyl phosphate lithium salts have been synthesized. The limiting partial molar volume of a PO4- group (23.43 ± 0.41 cm3mol-1) for use in small-angle neutron scattering analysis was determined by density measurements of a series of identical chain di-n-alkyl phosphate lithium salts. For lithium EOP-D2O system, a critical micellar concentration (2.3 wt%) was determined by 31P NMR spectra. The micellar shape and size in the EOP-water binary system has been investigated by using small-angle neutron scattering (SANS) spectra. It has been found that the micelles of barium EOP in water have the shape of a prolate spheroid and aggregation numbers (n) equal to 48 at 23° C and 52 at 50° C. For the lithium EOP-micellar system, it has been found that the minimum micelle with an aggregation number n = 21 is spherical and micellar growth and variation from the spherical to the prolate shape might occur with an increase in concentration above the CMC.

本文言語English
ページ(範囲)245-252
ページ数8
ジャーナルColloid and Polymer Science
274
3
DOI
出版ステータスPublished - 1996 3月
外部発表はい

ASJC Scopus subject areas

  • 物理化学および理論化学
  • ポリマーおよびプラスチック
  • コロイド化学および表面化学
  • 材料化学

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