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Self-assembly of polyion-surfactant ion complex salts in mixtures with water and n-alcohols.

Bernardes JS, Piculell L, Loh W - J Phys Chem B (2011)

Bottom Line: The obtained results were compared with a previous work on similar ternary mixtures of the same cationic surfactant but with the monomeric bromide counterion, CTABr (Fontell, K.; Khan, A.; Lindström, B.; Maciejewska, D.; Puang-Ngern, S.Colloid Polym.For mixtures with octanol and ethanol, in particular, the extensions of the disordered isotropic phases were larger for the complex salt with the shorter polyacrylate ions.

View Article: PubMed Central - PubMed

Affiliation: Institute of Chemistry, Universidade Estadual de Campinas Campinas (UNICAMP), Caixa Postal 6154, Campinas, SP, Brazil.

No MeSH data available.


Related in: MedlinePlus

SAXS spectraof samples contained in regions (A) H + L (composition: 7 wt % ofoctanol, 69 wt % of water and 24 wt % of C16TAPA30) and (B) L + H2 (composition: 38 wt % of octanol, 34wt % of water, and 28 wt % of CTAPA30).
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fig3: SAXS spectraof samples contained in regions (A) H + L (composition: 7 wt % ofoctanol, 69 wt % of water and 24 wt % of C16TAPA30) and (B) L + H2 (composition: 38 wt % of octanol, 34wt % of water, and 28 wt % of CTAPA30).

Mentions: At low octanol content, both systems present a normal hexagonalphase in equilibrium with excess of water (H + L1). Thenormal hexagonal phase, whose SAXS peaks appear at relative positions1, 31/2, 2, presents cell parameter of 51 Å for CTAPA30 and 50 Å for CTAPA6000. The hydrophobicradius of the cylinders, calculated following Kunieda et al.,21,22 is ca. 15 Å for both systems. The biphasic region (H + L1) persists until 6 wt % of octanol for CTAPA30 and3 wt % of octanol for CTAPA6000, where a three-phase regioncontaining hexagonal + lamellar + L1 phases is reached.A SAXS spectrum of the mixture (lamellar + hexagonal) is shown inFigure 3A. Within this region, the hydrophobicradius and bilayer thickness calculated for hexagonal and lamellarphases are, respectively, 18 and 19 Å for CTAPA30 and18 and 18 Å for CTAPA6000.


Self-assembly of polyion-surfactant ion complex salts in mixtures with water and n-alcohols.

Bernardes JS, Piculell L, Loh W - J Phys Chem B (2011)

SAXS spectraof samples contained in regions (A) H + L (composition: 7 wt % ofoctanol, 69 wt % of water and 24 wt % of C16TAPA30) and (B) L + H2 (composition: 38 wt % of octanol, 34wt % of water, and 28 wt % of CTAPA30).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211389&req=5

fig3: SAXS spectraof samples contained in regions (A) H + L (composition: 7 wt % ofoctanol, 69 wt % of water and 24 wt % of C16TAPA30) and (B) L + H2 (composition: 38 wt % of octanol, 34wt % of water, and 28 wt % of CTAPA30).
Mentions: At low octanol content, both systems present a normal hexagonalphase in equilibrium with excess of water (H + L1). Thenormal hexagonal phase, whose SAXS peaks appear at relative positions1, 31/2, 2, presents cell parameter of 51 Å for CTAPA30 and 50 Å for CTAPA6000. The hydrophobicradius of the cylinders, calculated following Kunieda et al.,21,22 is ca. 15 Å for both systems. The biphasic region (H + L1) persists until 6 wt % of octanol for CTAPA30 and3 wt % of octanol for CTAPA6000, where a three-phase regioncontaining hexagonal + lamellar + L1 phases is reached.A SAXS spectrum of the mixture (lamellar + hexagonal) is shown inFigure 3A. Within this region, the hydrophobicradius and bilayer thickness calculated for hexagonal and lamellarphases are, respectively, 18 and 19 Å for CTAPA30 and18 and 18 Å for CTAPA6000.

Bottom Line: The obtained results were compared with a previous work on similar ternary mixtures of the same cationic surfactant but with the monomeric bromide counterion, CTABr (Fontell, K.; Khan, A.; Lindström, B.; Maciejewska, D.; Puang-Ngern, S.Colloid Polym.For mixtures with octanol and ethanol, in particular, the extensions of the disordered isotropic phases were larger for the complex salt with the shorter polyacrylate ions.

View Article: PubMed Central - PubMed

Affiliation: Institute of Chemistry, Universidade Estadual de Campinas Campinas (UNICAMP), Caixa Postal 6154, Campinas, SP, Brazil.

No MeSH data available.


Related in: MedlinePlus