Phases and phase transitions in Gibbs monolayers of an alkyl phosphate surfactant

Hossain, M. Mahmun; Suzuki, Toshiyuki; Kato, Takeshi

doi:10.1016/j.jcis.2005.03.006

Cited by 19 publications

(36 citation statements)

References 52 publications

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“…With a solution of 3.0 × 10 −5 M n-HDP, the rate of adsorption is so rapid that no plateau appears in the π-t curve (curve III). Although, previously, several explanations for this plateau were suggested [42][43][44], the widely accepted interpretation is that a plateau in the π-t isotherm is caused by a first-order phase transition [23][24][25][26][27][28][29][30][31][32]45].…”

Section: Resultsmentioning

confidence: 98%

“…It is, therefore, assumed that the ions show little or no effect on the properties of the monolayers of these nonionic surfactants. In some previous papers, we have demonstrated that LC phases are formed in Gibbs adsorption layers of partially ionic n-alkyl phosphate surfactants [24,35]. Because of properties of -OP(O)(OH) 2 , the substitution of the nonionic head groups of the amphiphiles with this group would offer a high possibility for the cations to affect these monolayers.…”

Section: Introductionmentioning

confidence: 96%

“…Several research groups, including ours, have studied the phase behavior of slightly water-soluble surfactants in these monolayers. These studies reveal that depending on the nature of the surfactants and the experimental conditions, first-order G-LC [23,24], G-LE [24][25][26][27] and/or LE-LC [27][28][29][30][31][32] phase transitions occur in the adsorbed monolayers at the air-water interface. The existence of a first-order phase transition in these monolayers is indicated by the appearance of a plateau or a cusp point followed by a plateau in the surface pressure (π )-time (t) isotherms.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Interaction of an organic cation with Gibbs monolayers of n-hexadecyl phosphate

Hossain¹,

Suzuki²,

Kato³

2005

Journal of Colloid and Interface Science

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Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Interaction of an organic cation with Gibbs monolayers of n-hexadecyl phosphate

Hossain¹,

Suzuki²,

Kato³

2005

Journal of Colloid and Interface Science

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“…A Langmuir monolayer at an air/water interface usually adopts several distinct phases [35][36][37]. At low surface coverage, the molecules hardly interact with each other and form a two-dimensional "gas" phase.…”

Section: Surfactant Aggregate Structurementioning

confidence: 99%

Structural properties of hydroxyl-substituted alkyl benzenesulfonates at the water/vapor and water/decane interfaces

2011

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Molecular dynamics simulations have been performed to investigate the structural properties of hydroxyl-substituted alkyl benzenesulfonate monolayers formed at the water/vapor and water/decane interfaces. We report a detailed study of the interfacial properties-liquid density profile, hydrogen bond structure, surfactant aggregate structure and order parameter-of the novel anionic surfactant, sodium 2-hydroxy-3-decyl-5-octylbenzenesulfonate (C 10 C 8 OHphSO 3 Na). Simulation results show that: with increasing number of surfactant molecules, the average number of intramolecular hydrogen bonds per surfactant molecule in the monolayer decreases, but the structures forming the intramolecular hydrogen bonds still play a dominant role; the hydrophobic part of the alkyl tail chain, especially the decyl substituent on the third carbon atom in the benzene ring, becomes straighter, and more ordered towards the external interface at higher surfactant coverage; two-dimensional radial distribution functions can describe the characteristic of surfactant aggregate structures and highlight the decane phase effect on the orientation of the hydrophobic part of the surfactant; the surfactant molecules readily form long-range hydrogen bonded structures. Our results are an important complement to experimental studies. We used the all-atom model by employing the GROMACS and ffAMBER programs in the simulations, which provides a new way to simulate the interfacial behavior of alkyl benzenesulfonate surfactants. molecular dynamics, hydroxyl-substituted alkyl benzenesulfonates, hydrogen bond, radial distribution function, order parameter

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“…Data of an aqueous solution of TX in the absence of both MAP and Arg (closed diamond) was quoted from FIGURE 4, as a reference. When 0.5 mM DP was added to water in the absence of both Arg and TX, the DP molecule was spread over the water surface as a monolayer and showed high surface activity 11 . Therefore, the surface tension decreased to ca.…”

Section: (3) Effect Of Kohmentioning

confidence: 99%

Solubility of Monoalkyl Phophate in Water in the Presence of Arginine and Triton, and Solubilization of Methyl Yellow Through the Mixed Micelle

Murata

Ueno

Hino

et al. 2008

Phosphorus Research Bulletin

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Effects of arginine (Arg) and Triton such as Triton-X (TX) and Triton-N (TN) on the solubility of monoalkyl phosphoric acid (MAP) such as dodecyl (DP), myristyl (MP), and cetyl phosphoric acid (CP) in an aqueous phase were studied. Although these MAPs are scarcely soluble in water, their solubility at 70 o C increased with a concentration of Triton added. The effect of TN was stronger than that of TX. DP became soluble at room temperature when Arg was added up to the mixing ratio of Arg/DP = 3 in mole. MP and CP were hardly soluble yet in the presence of Arg alone while these became soluble after adding Triton together with Arg. Their acidic head group was ionized by Arg, resulting in an increase in its affinity for water. DP was soluble just after the ionization while MP and CP were soluble after the ionization and concomitant formation of the mixed micelle with the Triton added. Methyl yellow, barely soluble in water, was solubilized after entrapment into the mixed micelle. Its solubility increased with a concentration and chain length of the MAP added as a solubilizing agent.

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Phases and phase transitions in Gibbs monolayers of an alkyl phosphate surfactant

Cited by 19 publications

References 52 publications

Interaction of an organic cation with Gibbs monolayers of n-hexadecyl phosphate

Interaction of an organic cation with Gibbs monolayers of n-hexadecyl phosphate

Structural properties of hydroxyl-substituted alkyl benzenesulfonates at the water/vapor and water/decane interfaces

Solubility of Monoalkyl Phophate in Water in the Presence of Arginine and Triton, and Solubilization of Methyl Yellow Through the Mixed Micelle

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