Facile control of surfactant lamellar phase transition and adsorption behavior

Gonçalves, Rui A.; Naidjonoka, Polina; Nylander, Tommy; Miguel, Maria; Lindman, Björn; Lam, Yeng Ming

doi:10.1039/d0ra01340d

Cited by 8 publications

(7 citation statements)

References 25 publications

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“…To this end, we monitored structural changes on large dilutions with water. This was dealt with for a few additives in a previous publication [ 22 ], and here only some brief comments are made. The ternary surfactant-additive-water mixtures were diluted with water on a 1:10 sample/water ratio.…”

Section: Resultsmentioning

confidence: 99%

“…Thus, on dilution, we observe the reappearance of the characteristic WAXS diffraction pattern of the L β phase, in addition to the lamellar diffraction patterns. In a previous publication, we have in some detail analysed this problem, and also presented deposition studies monitoring deposition on a substrate by in-situ null ellipsometry [ 22 ].…”

Section: Resultsmentioning

confidence: 99%

“…Ultrapure water of 18 S/m conductivity was used to prepare the samples. Binary DODAB/C–water and ternary DODAB/C–water–additive mixtures were prepared, as described previously [ 22 ]. Diluted samples were prepared by weighing a fraction of the original sample and diluting in a 1:10 sample/water ratio, in a screw-cap glass vial.…”

Section: Methodsmentioning

confidence: 99%

“…At higher temperatures, the thermodynamically stable phase is L α ; from a stability perspective, it would be preferable for the formulation to be a stable system rather than a dispersion. As we have already alluded to in our previous report [ 22 ], a further aim of our work was to investigate the possibility of designing formulations that contain the L α phase, but spontaneously transform into L β on dilution with water, mimicking the situation in practical use. Thus, we were interested in adding substances that appreciably lower the phase transition temperature, but are soluble in water so that upon dilution, the L β phase forms spontaneously.…”

Section: Introductionmentioning

confidence: 99%

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Double-Chain Cationic Surfactants: Swelling, Structure, Phase Transitions and Additive Effects

2021

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Double-chain amphiphilic compounds, including surfactants and lipids, have broad significance in applications like personal care and biology. A study on the phase structures and their transitions focusing on dioctadecyldimethylammonium chloride (DODAC), used inter alia in hair conditioners, is presented. The phase behaviour is dominated by two bilayer lamellar phases, Lβ and Lα, with “solid” and “melted” alkyl chains, respectively. In particular, the study is focused on the effect of additives of different polarity on the phase transitions and structures. The main techniques used for investigation were differential scanning calorimetry (DSC) and small- and wide-angle X-ray scattering (SAXS and WAXS). From the WAXS reflections, the distance between the alkyl chains in the bilayers was obtained, and from SAXS, the thicknesses of the surfactant and water layers. The Lα phase was found to have a bilayer structure, generally found for most surfactants; a Lβ phase made up of bilayers with considerable chain tilting and interdigitation was also identified. Depending mainly on the polarity of the additives, their effects on the phase stabilities and structure vary. Compounds like urea have no significant effect, while fatty acids and fatty alcohols have significant effects, but which are quite different depending on the nonpolar part. In most cases, Lβ and Lα phases exist over wide composition ranges; certain additives induce transitions to other phases, which include cubic, reversed hexagonal liquid crystals and bicontinuous liquid phases. For a system containing additives, which induce a significant lowering of the Lβ–Lα transition, we identified the possibility of a triggered phase transition via dilution with water.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Double-Chain Cationic Surfactants: Swelling, Structure, Phase Transitions and Additive Effects

2021

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“…Therefore, it is important to study the adsorption and desorption of α-gels in aqueous media. Recently, Lam et al 17 reported a smart surface coating using α-gel or lamellar gel dispersion systems. They studied the adsorption and desorption of a double-chain cationic surfactant dioctadecy-Abstract: We characterized the adsorption and desorption of α-gel (α-form hydrated crystal) dispersions in aqueous media using a quartz crystal microbalance with dissipation monitoring (QCM-D) technique.…”

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confidence: 99%

Adsorption and Lubrication of α-Gel (α-Form Hydrated Crystal) Dispersion at Solid/Liquid Interfaces

et al. 2021

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IntroductionMixtures of surfactant, long-chain alcohol, and water can yield a lamellar gel below the gel-liquid crystal phase transition temperature T C . The assembly called α-gel or α-form hydrated crystal is a type of lamellar gel; i.e., the alkyl chains of surfactant and long-chain alcohol molecules are hexagonally packed within bilayers in the lamellar gel network 1 3 . α-Gels can contain a large amount of water in the spaces not only between the lamellar bilayers, but also between onion-like or vesicular domains 4,5 . The viscoelasticity of the α-gel was largely affected by the amount of water localized in these spaces. Furthermore, the viscoelasticity of α-gel can be controlled by the domain shape 6 8 , domain size 9 , and background electrolyte concentration 10,11 . α-Gel is widely used in cream-like personal care products such as hair conditioners. Cationic surfactants are used in hair conditioners owing to their ability to adsorb onto hair surfaces 12,13 . The N-3-dimethylamino propyl

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Investigation of the polymer additive on the lyotropic lamellar phase formed by surfactants with different head groups

Cukurkent,

Masalci

2024

Colloid Polym Sci

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Facile control of surfactant lamellar phase transition and adsorption behavior

Abstract: The presence of small water-soluble additives makes it possible to tune the surfactant gel-to-liquid crystalline (Lβ–Lα) phase transition temperature (Tm) for a bilayer-forming cationic surfactant system and its phase behavior on dilution.

Cited by 8 publications

References 25 publications

Double-Chain Cationic Surfactants: Swelling, Structure, Phase Transitions and Additive Effects

Double-Chain Cationic Surfactants: Swelling, Structure, Phase Transitions and Additive Effects

Adsorption and Lubrication of α-Gel (α-Form Hydrated Crystal) Dispersion at Solid/Liquid Interfaces

Investigation of the polymer additive on the lyotropic lamellar phase formed by surfactants with different head groups

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