Thermodynamic Study on Vesicle Formation and Adsorption of Decyltrimethylammonium Decyl Sulfate

Villeneuve, Masumi; Kaneshina, Shoji; Aratono, Makoto

doi:10.1006/jcis.2001.7536

Cited by 10 publications

(8 citation statements)

References 27 publications

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“…With increasing concentration, c decreases linearly, showing a break point, and increases slightly at higher temperatures. This result is inconsistent with that given by Villeneuve et al (2001) working on mixed ionic surfactants.…”

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confidence: 79%

Behavior Study of Some Commercial Nonionic Compounds in Comparison With Anionic Surfactant

Shalaby

2007

Chemical Engineering Communications

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The surface tension of aqueous surfactant solutions was measured as a function of temperature at various bulk concentrations for homogeneous series of polyoxyethylene (n) cotton seed fatty acid [Co(EO) n ] (where n ¼ 20, 40, and 80 units) as nonionic surfactants and the anionic sodium oleic sulfonate (SOS). The critical micelle concentration (CMC), surface density C H , and thermodynamic quantity changes associated with the adsorption and micellization were deduced. CMC values were influenced by both hydrophilic chain length and temperature. It has been found that the trend of C H of the tested nonionic samples resembles that of the anionic SOS due to their huge polar head groups. DG o mic values of the tested nonionic surfactants are lower than that of the anionic surfactant due to the dehydration of the EO chains of the former in addition to the electrostatic repulsion acting between the head groups of the latter. DG o ad possesses lower values than DG o mic due to the crowding of the hydrocarbon chains acting inside the micelle. The variations of surface tension with temperature as well as entropy with concentration show the probability of nonionic surfactants (with long EO chains) behaving the same as ionic surfactants.

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confidence: 79%

Behavior Study of Some Commercial Nonionic Compounds in Comparison With Anionic Surfactant

Shalaby

2007

Chemical Engineering Communications

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“…Surfactants form various kinds of molecular assemblies, and in particular, the micelle formation of many surfactants has been widely studied. However, bilayer-forming surfactants are so restricted to certain surfactants such as double chain surfactants, − catanionic surfactants, and cationic and anionic surfactant mixtures . Accordingly, there are few studies on the bilayer formation of surfactants, and no unified conclusion among researchers has been given even for the bilayer phase behavior of surfactants with simple chemical structure like dialkyldimethylammonium bromide (2C n Br).…”

Section: Introductionmentioning

confidence: 99%

Thermotropic and Barotropic Phase Transitions of Dialkyldimethylammonium Bromide Bilayer Membranes: Effect of Chain Length

et al. 2011

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The bilayer phase transitions of dialkyldimethylammonium bromides (2C(n)Br; n = 12, 14, 16) were observed by differential scanning calorimetry and high-pressure light-transmittance measurements. Under atmospheric pressure, the 2C(12)Br bilayer membrane underwent the stable transition from the lamellar crystal (L(c)) phase to the liquid crystalline (L(α)) phase. The 2C(14)Br bilayer underwent the main transition from the metastable lamellar gel (L(β)) phase to the metastable L(α) phase in addition to the stable L(c)/L(α) transition. For the 2C(16)Br bilayer, moreover, three kinds of phase transitions were observed: the metastable main transition, the metastable transition from the metastable lamellar crystal (L(c(2))) phase to the metastable L(α) phase, and the stable lamellar crystal (L(c(1)))/L(α) transition. The temperatures of all the phase transitions elevated almost linearly with increasing pressure. The temperature (T)-pressure (p) phase diagrams of the 2C(12)Br and 2C(14)Br bilayers were simple, but that of the 2C(16)Br bilayer was complex; that is, the T-p curves for the metastable main transition and the L(c(2))/L(α) transition intersect at ca. 25 MPa, which means the inversion of the relative phase stability between the metastable phases of L(β) and L(c(2)) above and below the pressure. Moreover, the T-p curve of the L(c(2))/L(α) transition was separated into two curves under high pressure, and as a result, the pressure-induced L(c(2P)) phase appeared in between. Thermodynamic quantities for phase transitions of the 2C(n)Br bilayers increased with an increase in alkyl-chain length. The chain-length dependence of the phase-transition temperature for all kinds of transitions observed suggests that the stable L(c(1))/L(α) transition incorporates the metastable L(c(2))/L(α) transition in the bilayers of 2C(n)Br with shorter alkyl chains, and the main-transition of the 2C(12)Br bilayer would occur at a temperature below 0 °C.

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“…In binary surfactant mixtures, spontaneous vesicle formation is expected to take place more easily than in single surfactant systems because an uneven distribution of different surfactants is possible between two monolayers having an opposite sign of curvature. Typical combinations experimentally investigated are double-long-chain salts (R 1 + R 2 – ), cationic and anionic surfactants mixtures (R 1 + X − + M + R 2 – ), – single-chain and double-chain surfactant mixtures (R + X − + (R 1 R 2 ) + Y − ), ,, binary double-chain surfactant mixtures ((R 1 R 1 ) + X − + (R 2 R 2 ) + X − ), and so on. In the first and second cases, the respective single surfactants do not form vesicles solely but their mixtures do.…”

Section: Introductionmentioning

confidence: 99%

Spontaneous Vesicle Formation of Mixtures of Double-Chain Cationic Surfactants with a Different Counterion

et al. 2008

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Aggregate formation of a didodecyldimethylammonium bromide (DDAB) and didodecyldimethylammonium chloride (DDAC) mixture in aqueous solution was investigated. The concentration vs composition diagram of aggregate formation was constructed by analyzing the surface tension, turbidity, and electrical conductivity data. The cryogenic transmission electron microscopy was applied to several representative points in the diagram and provided information of the morphology of aggregates. The sequence of monomer (m) - m + small aggregate (A) - m + A + vesicle (V) - m + V was concluded with increasing total concentration of surfactants at all mixing ratios. The compositions of counterions in A and V were estimated on the basis of thermodynamic consideration and examined from the viewpoint of asymmetry of constituents and uneven distribution between outer and inner monolayers of a vesicle bilayer. Vesicle surfaces were suggested to abound in chloride ions compared to bulk solution, which is opposite to spherical micelle surfaces.

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Thermodynamic Study on Vesicle Formation and Adsorption of Decyltrimethylammonium Decyl Sulfate

Cited by 10 publications

References 27 publications

Behavior Study of Some Commercial Nonionic Compounds in Comparison With Anionic Surfactant

Behavior Study of Some Commercial Nonionic Compounds in Comparison With Anionic Surfactant

Thermotropic and Barotropic Phase Transitions of Dialkyldimethylammonium Bromide Bilayer Membranes: Effect of Chain Length

Spontaneous Vesicle Formation of Mixtures of Double-Chain Cationic Surfactants with a Different Counterion

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