Effect of Novel Alkanolamides on the Phase Behavior and Surface Properties of Aqueous Surfactant Solutions

Feng, Jia‐Xun; Rodríguez, Concepción González; Izawa, Teruki; Kunieda, H.; Sakai, Tomomi

doi:10.1081/dis-120030663

Cited by 11 publications

(5 citation statements)

References 27 publications

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“…The phase-separation concentrations of NMEA having various alkyl chain lengths are shown as C 2 in Figure . It has already been reported that liquid−liquid phase separation takes place in NMEA-08 and NMEA-10 aqueous solutions, that NMEA-12 forms a lamellar phase dispersed in water, and that NMEA-14 precipitates as a solid. One can clearly see the two break points on the γ vs log C plots of NMEA-08, -10, and -12.…”

Section: Resultsmentioning

confidence: 95%

Premicellar Aggregation of Fatty Acid N-Methylethanolamides in Aqueous Solutions

2006

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The aggregation behaviors of an excellent nonionic foam booster, namely, fatty acid N-methylethanolamide (NMEA-X; X indicates the carbon number of the acyl group), in aqueous solutions have been studied by equilibrium surface tension (gamma), solubilization of oil-soluble dye, and steady-state fluorescence techniques. NMEA, having a longer alkyl chain than NMEA-08, clearly had two break points on the gamma versus log C (where C is concentration) curves. The solubilization of the oil-soluble dye for NMEA aqueous solutions began at the break point of higher concentration in the gamma versus log C curves, so this concentration was confirmed to be the critical micellization concentration (cmc). Above the cmc, however, a separate oil phase of NMEA was observed instead of micelles of limited size. Another break point at lower concentration was also observed in plots of the fluorescence intensity ratio of pyrene, I1/I3, versus log C of NMEA. The gradual decrease of I1/I3 and the appearance of excimer emission of pyrene in the concentration region between the two break points suggest the existence and growth of premicellar aggregates and the solubilization ability of pyrene. Consequently, this break point at lower concentration was assumed to be the critical premicellization concentration (cac). The surface tension reduction in the premicellar region decreased with increasing alkyl chain length of NMEA.

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Section: Resultsmentioning

confidence: 95%

Premicellar Aggregation of Fatty Acid N-Methylethanolamides in Aqueous Solutions

2006

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“…[1][2][3][4][5] Their properties have additionally been exploited as foam boosters, thickening agents, and corrosion inhibitors. [1][2][3][4][5][6][7] Coconut oil, from which coconut diethanolamide is derived, consists of a range of both saturated fatty acid components (ranging from C6-C18) and unsaturated fatty acid components including monounsaturated oleic acid and polyunsaturated linoleic acid, thus coconut DEA contains diethanolamides of these different fatty acid components. While lauroyl diethanolamide has been studied in detail, physicochemical characterization of other coconut DEA components has been limited.…”

Section: Introductionmentioning

confidence: 99%

Nonionic diethanolamide amphiphiles with unsaturated C18 hydrocarbon chains: thermotropic and lyotropic liquid crystalline phase behavior

Sagnella

Conn

Krodkiewska

et al. 2011

Phys. Chem. Chem. Phys.

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The neat and lyotropic liquid crystalline phase behavior of three nonionic diethanolamide amphiphiles with C18 hydrocarbon chains containing one, two or three unsaturated bonds has been examined. This has allowed the effect of degree of unsaturation on the phase behavior of diethanolamide amphiphiles to be investigated. Neat linoleoyl and linolenoyl diethanolamide undergo a transition from a glassy liquid crystal to a liquid crystal at ∼-85 °C, while neat oleoyl diethanolamide undergoes a transition at ∼-60 °C to a liquid crystalline material before re-crystallizing at -34 °C. Oleoyl diethanolamide then undergoes a third transition from a crystalline phase to a smectic liquid crystalline phase at ∼5 °C. In the absence of water, the transition temperature from a smectic liquid crystal to an isotropic liquid decreases with increasing unsaturation. The addition of water results in the formation of a lamellar phase (L(α)) for all three amphiphiles. The lamellar phase is stable under excess water conditions up to temperatures of at least 70 °C. Approximate partial binary amphiphile-water phase diagrams generated for the three unsaturated C18 amphiphiles indicate that the excess water point for each amphiphile occurs at ∼60% (w/w) amphiphile.

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“…This is due to the decrease in electrostatic repulsion between SDS head groups caused by the presence of CDEA molecules between charged SDS head groups. 10,13,21,22 The C 40 value at all mole fractions was smaller than the ideal C 40 calculated from a similar equation as shown in eq 4. Also, the γ min values at every mole fraction was smaller than the γ min value of the pure surfactant, indicating a smaller headgroup area and a tightly packed adsorbed film.…”

Section: Resultsmentioning

confidence: 81%

“…The addition of alkanolamides to SDS proved effective in reducing the Krafft temperature by altering the CMC of the mixture. 12,13 The decrease in the Krafft temperature was larger for surfactants with bivalent counterions as compared to the surfactants with monovalent counterions. Strong interaction or complex formation was reported by Tsujii and co-workers 14 for a sulfobetaine−SDS mixed system.…”

Section: Introductionmentioning

confidence: 97%

Effect of Foam Boosters on the Micellization and Adsorption of Sodium Dodecyl Sulfate

Prajapati

Bhagwat

2012

J. Chem. Eng. Data

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The interactions between the anionic surfactant sodium dodecyl sulfate and various foam boosters such as cocodiethanolamide, cocoamidopropylbetaine, and monoethoxylated cocomonoethanolamide are investigated. Interfacial interactions between sodium dodecyl sulfate and foam boosters were assessed by the surface tension method. An increase in the mole fraction of foam boosters reduced the critical micelle concentration (CMC) of anionic surfactant. The strength of interaction for micellization (βM) and adsorption (β40) are calculated from surface tension studies. The zwitterionic foam booster cocoamidopropylbetaine showed strong synergistic interaction with sodium dodecyl sulfate for both adsorption and micellization.

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Effect of Novel Alkanolamides on the Phase Behavior and Surface Properties of Aqueous Surfactant Solutions

Cited by 11 publications

References 27 publications

Premicellar Aggregation of Fatty Acid N-Methylethanolamides in Aqueous Solutions

Premicellar Aggregation of Fatty Acid N-Methylethanolamides in Aqueous Solutions

Nonionic diethanolamide amphiphiles with unsaturated C18 hydrocarbon chains: thermotropic and lyotropic liquid crystalline phase behavior

Effect of Foam Boosters on the Micellization and Adsorption of Sodium Dodecyl Sulfate

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