Synergism and formation of vesicle gels in salt-free catanionic hydrocarbon/fluorocarbon surfactant mixtures

Yang, Mei; Hao, Jingcheng; Li, Hongguang

doi:10.1039/c4ra07794f

Cited by 9 publications

(11 citation statements)

References 46 publications

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“…In oscillatory measurements, the elastic modulus G′ is higher than the viscous modulus G″, and both of them vary only slightly with increasing angular frequency ( Figure 8A). This is consistent with the rheological behavior of the bilayer structures formed in catanionic surfactant mixtures such as the closely packed vesicles, 14,15,41,50 indicating that the samples containing hyperbranched bilayers are also viscoelastic. Compared to the mixture of C 14 DMAO and a single-tailed fluorocarbon carboxylic acid (C 7 F 15 CF = CHCOOH) which contains very stiff vesicles, the viscoelasticity here is at least 1 order of magnitude weaker.…”

Section: ■ Experimental Sectionsupporting

confidence: 83%

“…As shown in Figure 9A, at c C 14 -S-C 14 = 65 mmol·L −1 , T c is determined to be 7.52°C, which is close to that of pure C 14 DMAO aqueous solution. 15 When c C 14 -S-C 14 is increased, T c decreases first, reaches a minimum (4.6°C) at c C 14 -S-C 14 = 80 mmol·L −1 , and then increases up to 6.27°C at c C 14 -S-C 14 = 90 mmol·L −1 . On one hand, with the increase in c C 14 -S-C 14 , the hydrophobic effect among the alkyl chains of C 14 DMAO and SA will reach a maximum because of close packing.…”

Section: ■ Experimental Sectionmentioning

confidence: 98%

“…On one hand, C 14 DMAO can be charged by the H + released from SA, forming cationic surfactant C 14 DMAOH + which can form ion pairs with SA 2− (inset of Figure 1A, denoted as C 14 -S-C 14 ). 15 Besides, hydrogen bonding may also exist among C 14 DMAOH + , C 14 DMAO, and SA molecules. These will induce the coadsorption of SA with C 14 DMAO at the air/water interface and lead to strong synergistic effects.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

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Self-Assembly and Rheological Properties of a Pseudogemini Surfactant Formed in a Salt-Free Catanionic Surfactant Mixture in Water

Chai

et al. 2015

Langmuir

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The surface and bulk properties of bola-type dicarboxylic acid (sebacic acid, SA) and zwitterionic surfactant tetradecyldimethylamine oxide (C14DMAO) mixtures in aqueous solutions were studied. Surface tension measurements indicate a pronounced synergistic effect between SA and C14DMAO. In bulk aqueous solutions, rich phase behavior was observed with a varied SA-to-C14DMAO ratio (ρ) and a total surfactant concentration. Typically at ρ = 0.5, a novel pseudogemini surfactant (C14-S-C14) forms, driven by electrostatic interaction and hydrogen bonding. The C14-S-C14/H2O system exhibits rich phase behavior induced by the transition of aggregates. With increasing concentration of C14-S-C14, one can observe a viscous L1 phase, an L1/Lα two-phase region where a birefringent Lα phase is on the top of an L1 phase, a single Lα phase, and finally a mixture of an Lα phase and a precipitate. Microstructures formed in the Lα phases were determined by freeze-fracture transmission electron microscopy (FF-TEM) and cryogenic-transmission electron microscopy (cryo-TEM) observations. Polymorphic aggregation behavior was observed with the formation of a variety of bilayer structures including unilamellar vesicles, onions, and open and hyperbranched bilayers. Rheological measurements showed that the Lα phases are viscoelastic and sensitive to temperature where a quick loss of viscoelasticity was observed at elevated temperature.

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Section: ■ Experimental Sectionsupporting

confidence: 83%

Section: ■ Experimental Sectionmentioning

confidence: 98%

Section: ■ Experimental Sectionmentioning

confidence: 99%

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Self-Assembly and Rheological Properties of a Pseudogemini Surfactant Formed in a Salt-Free Catanionic Surfactant Mixture in Water

Chai

et al. 2015

Langmuir

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“…The interactions among surfactants can lead to synergistic effects (Muherei and Junin, 2009;Olea and Gamboa, 2003;Yang et al, 2014), allowing them to achieve the optimum behaviors of washing, wetting, or solubilizing with minimum surfactant consumption. For example, the synergistic effects among various detergents and other formulations in shampoos resulted in a greatly enhanced washing effect compared to single surfactant formulations (Li, 2012).…”

Section: Introductionmentioning

confidence: 99%

Study on the Synthesis and Compounding Performance of C₂₁ Dibasic Acid Potassium

Liu

Lin

et al. 2020

J Surfact & Detergents

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A long‐chain dibasic acid with six‐membered ring, C21 dibasic acid (C21‐DA), was synthesized with mixed fatty acid, acrylic acid as starting materials, and iodine as the catalyst and quinol as polymerization inhibitor. The product was purified by distillation under reduced pressure and characterized using mass spectroscopy (MS) and nuclear magnetic resonance spectroscopy (1H NMR). An anionic surfactant, C21 dibasic acid potassium (C21‐DAP), was synthesized with KOH via neutralization reaction. The synergistic effect was investigated by mixing C21‐DAP with fatty alcohol polyoxyethylene ether with 7 ethoxy groups (AEO7), dodecyl trimethyl ammonium chloride (DTAC) and octadecyl dimethyl betaine (BS‐18), respectively, to evaluate the surface activity. The results showed that the mixed system of C21‐DAP/DTAC possessed the best synergistic effect among all studied systems, where a minimum surface tension at the critical micelle concentration (γCMC) of 28.28 mN m−1 was obtained. Because of the electrostatic attraction between C21‐DAP and DTAC, the repulsive force between the same kind of molecules and micelle molecules in the surface adsorption layer was indirectly reduced.

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“…Surfactants are one particularly interesting class of hydrogelators. [15][16][17][18] Surfactant molecules are oen quite soluble in water, and they self-assemble into various aggregates, such as wormlike micelles, [19][20][21][22][23] vesicles, [24][25][26] lamellar structures, [27][28][29] nanobers and microtubes [30][31][32][33][34][35][36] in aqueous solution, above the so-called critical micelle concentration. These aggregates have shown the ability to build stable hydrogels.…”

Section: Introductionmentioning

confidence: 99%

Formation and phase transition of hydrogel in a zwitterionic/anionic surfactant system

Fan

Zhao

et al. 2015

RSC Adv.

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The phase behavior and microstructure in a mixture of the zwitterionic surfactant N-hexadecyl-N,Ndimethyl-3-ammonio-1-propane sulfonate (HDPS) and anionic surfactant sodium dodecylsulfate (SDS) were studied. Analysis of its macroscopic appearance, tube inversion testing and rheological measurements were employed to characterize its phase behavior, and it was found that a hydrogel formed in an appropriate total concentration (C T ) and molar percentage of SDS (X SDS ) at 25 C for HDPS/ SDS systems. Microstructures in the hydrogel were identified to be long wormlike micelles and small spherical vesicles, using transmission electron microscopy (TEM). The coexistence of wormlike micelles and small vesicles brings an appropriate packing parameter (p), which indicates that the wormlike micelles reached a sufficient length and degree of entanglement to form the three-dimensional elastic hydrogel. The HDPS/SDS hydrogel transforms into a viscoelastic sol upon increasing the temperature, and the determined gel-sol transition temperature (T g-s ) has been determined to be around 30 C, using optical and rheological methods. Besides, adding salt causes the wormlike micelles to lengthen and the rheological properties of the solution to change, such that it may even induce a sol-gel phase transition in the mixed zwitterionic and anionic surfactant system.

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Synergism and formation of vesicle gels in salt-free catanionic hydrocarbon/fluorocarbon surfactant mixtures

Cited by 9 publications

References 46 publications

Self-Assembly and Rheological Properties of a Pseudogemini Surfactant Formed in a Salt-Free Catanionic Surfactant Mixture in Water

Self-Assembly and Rheological Properties of a Pseudogemini Surfactant Formed in a Salt-Free Catanionic Surfactant Mixture in Water

Study on the Synthesis and Compounding Performance of C₂₁ Dibasic Acid Potassium

Formation and phase transition of hydrogel in a zwitterionic/anionic surfactant system

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Synergism and formation of vesicle gels in salt-free catanionic hydrocarbon/fluorocarbon surfactant mixtures

Cited by 9 publications

References 46 publications

Self-Assembly and Rheological Properties of a Pseudogemini Surfactant Formed in a Salt-Free Catanionic Surfactant Mixture in Water

Self-Assembly and Rheological Properties of a Pseudogemini Surfactant Formed in a Salt-Free Catanionic Surfactant Mixture in Water

Study on the Synthesis and Compounding Performance of C21 Dibasic Acid Potassium

Formation and phase transition of hydrogel in a zwitterionic/anionic surfactant system

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Product

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Study on the Synthesis and Compounding Performance of C₂₁ Dibasic Acid Potassium