Preparation of sodium oleate/layered double hydroxide composites with acid-resistant properties

Yoshikazu Kameshima, Hisako Yoshizaki, Akira Nakajima, Kiyoshi Okada

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

Mg{single bond}Al{single bond}CO3 type layered double hydroxides (LDHs) with Mg/Al ratios ranging from 2 to 5 were synthesized by coprecipitation. Composites with sodium oleate/LDH were prepared by ion exchange and reconstruction of the LDH in sodium oleate solution. The amount of sodium oleate in the composites prepared by this reconstruction method was higher than that in samples prepared by the ion-exchange method. The basal spacings of the LDHs increased to 3.9 and 1.8 nm after synthesis of the composites, these spacings being in good agreement with models based on the assumption that the oleate ions are intercalated as bilayer and/or micelle structures, and as monolayers in the LDH interlayers, respectively. The number of sorbed oleate ions was higher than calculated from the anion-exchange capacities of the LDHs in most of the samples, increasing as the Mg/Al ratios of the LDHs were increased from 2 to 5. These results suggest that the oleate ions are present not only in the interlayers but also on the surfaces of the LDH particles. The acid-resistant properties of the composites were found to be much higher than for the pure LDHs. It is thus confirmed that the surfaces of the LDH particles in the composites are mostly covered with sorbed oleate ions and that the composites are good candidates as drug delivery materials.

Original languageEnglish
Pages (from-to)624-628
Number of pages5
JournalJournal of Colloid And Interface Science
Volume298
Issue number2
DOIs
Publication statusPublished - Jun 15 2006
Externally publishedYes

Keywords

  • Acid-resistant properties
  • Composite
  • Layered double hydroxide
  • Sodium oleate

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

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