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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 sample contained in region C + L1 (composition: 4 wt% of ethanol, 69 wt % of water, and 27 wt % of CTAPA30).
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fig4: SAXS spectraof sample contained in region C + L1 (composition: 4 wt% of ethanol, 69 wt % of water, and 27 wt % of CTAPA30).

Mentions: On increasing the alcohol content along the dilution line, theethanol molecules, as in butanol system, should be incorporated bothin the liquid crystalline phase and in the aqueous isotropic phase(L1) because of complete miscibility of water and ethanol.At low ethanol concentration (2 wt %), a narrow biphasic region withcubic + L1 phases was detected for CTAPA30.The SAXS spectrum of the Pm3n cubicphase is represented in Figure 4. The cellparameter calculated for this phase is 145 Å, which is 40 Ålarger than that obtained for the binary complex salt + water system.(2) As ∼3 wt % ethanol was added to the system,a cubic-to-hexagonal phase transition was observed. The three-phaseregion cubic + hexagonal + L1 was not detected during theexperiment because it represents a narrow area in the phase diagram,being difficult to prepare a sample with the exact composition thatfits this region. However it is represented in the phase diagram forconsistency with the Gibbs phase rule.


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 sample contained in region C + L1 (composition: 4 wt% of ethanol, 69 wt % of water, and 27 wt % of CTAPA30).
© Copyright Policy - open-access
Related In: Results  -  Collection

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

fig4: SAXS spectraof sample contained in region C + L1 (composition: 4 wt% of ethanol, 69 wt % of water, and 27 wt % of CTAPA30).
Mentions: On increasing the alcohol content along the dilution line, theethanol molecules, as in butanol system, should be incorporated bothin the liquid crystalline phase and in the aqueous isotropic phase(L1) because of complete miscibility of water and ethanol.At low ethanol concentration (2 wt %), a narrow biphasic region withcubic + L1 phases was detected for CTAPA30.The SAXS spectrum of the Pm3n cubicphase is represented in Figure 4. The cellparameter calculated for this phase is 145 Å, which is 40 Ålarger than that obtained for the binary complex salt + water system.(2) As ∼3 wt % ethanol was added to the system,a cubic-to-hexagonal phase transition was observed. The three-phaseregion cubic + hexagonal + L1 was not detected during theexperiment because it represents a narrow area in the phase diagram,being difficult to prepare a sample with the exact composition thatfits this region. However it is represented in the phase diagram forconsistency with the Gibbs phase rule.

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