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 language | English |
|---|---|
| Pages (from-to) | 624-628 |
| Number of pages | 5 |
| Journal | Journal of Colloid and Interface Science |
| Volume | 298 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - Jun 15 2006 |
| Externally published | Yes |
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Keywords
- Acid-resistant properties
- Composite
- Layered double hydroxide
- Sodium oleate
ASJC Scopus subject areas
- Colloid and Surface Chemistry
- Physical and Theoretical Chemistry
- Surfaces and Interfaces
Cite this
Preparation of sodium oleate/layered double hydroxide composites with acid-resistant properties. / Kameshima, Yoshikazu; Yoshizaki, Hisako; Nakajima, Akira; Okada, Kiyoshi.
In: Journal of Colloid and Interface Science, Vol. 298, No. 2, 15.06.2006, p. 624-628.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Preparation of sodium oleate/layered double hydroxide composites with acid-resistant properties
AU - Kameshima, Yoshikazu
AU - Yoshizaki, Hisako
AU - Nakajima, Akira
AU - Okada, Kiyoshi
PY - 2006/6/15
Y1 - 2006/6/15
N2 - 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.
AB - 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.
KW - Acid-resistant properties
KW - Composite
KW - Layered double hydroxide
KW - Sodium oleate
UR - http://www.scopus.com/inward/record.url?scp=33646363318&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33646363318&partnerID=8YFLogxK
U2 - 10.1016/j.jcis.2006.01.033
DO - 10.1016/j.jcis.2006.01.033
M3 - Article
VL - 298
SP - 624
EP - 628
JO - Journal of Colloid and Interface Science
JF - Journal of Colloid and Interface Science
SN - 0021-9797
IS - 2
ER -