Elucidating the effect of additives on the alkyl chain packing of a double tail cationic surfactant

Gonçalves, Rui A.; Lindman, Björn; Miguel, Maria G.; Iwata, T.; Lam, Yeng Ming

doi:10.1016/j.jcis.2018.05.092

Cited by 15 publications

(16 citation statements)

References 48 publications

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“…Binary DODAC-water and ternary DODACwater-additive mixtures were prepared as described previously. 14 Diluted samples were prepared by weighting a fraction of the original sample and diluting in a 1 : 10 sample/water ratio, on a screw-cap glass vial. All the samples were equilibrated at room temperature for, at least, seven days before characterization.…”

Section: Materials and Sample Preparationmentioning

confidence: 99%

“…21,22 In this study we used a dn/dc value of 0.18 cm 3 g À1 which gives amounts consistent with results from X-ray characterization of DODAC bilayers previously reported. 14 2.4.2. Hydrophilic silica surface.…”

Section: Surfactant Adsorption On Surfacesmentioning

confidence: 99%

“…Additional features can be extracted from the SAXS and WAXS proles, such as interlamellar d-spacing, polar layer thickness, non-polar layer thickness and the area per surfactant molecule as discussed in detail in our previous study. 14 The surfactant mixtures were diluted ten times with water. These diluted mixtures display a rather thick water layer, and therefore they were characterized using synchrotron SAXS/ WAXS beamline as the scattering is rather weak.…”

Section: Surfactant Packing In the Diluted Regimementioning

confidence: 99%

“…This result is consistent with the area per surfactant molecule of bulk DODAC-water mixtures determined using SAXS in our previous study. 14 Table 3 summarizes the properties of the adsorbed layers from the diluted DODAC-water-additive mixtures. Since all the lms onto the hydrophilic silica are deposited from a highly diluted medium they are expected to be in the gel phase at 25 C as demonstrated by the DSC and WAXS results.…”

Section: Adsorbed Amount and Layer Thickness Upon Rinsingmentioning

confidence: 99%

“…In our previous work, we demonstrated the ability to tune the main phase transition temperature by using additives which are preferably located at the surfactant-water interface. 14 Small polar molecules are known to be active in affecting the bilayer uidity in biological systems. These systems also comprise double-chained amphiphiles, and the mechanisms will be the same for biological systems and surfactant systems.…”

Section: Introductionmentioning

confidence: 99%

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Facile control of surfactant lamellar phase transition and adsorption behavior

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Section: Materials and Sample Preparationmentioning

confidence: 99%

Section: Surfactant Adsorption On Surfacesmentioning

confidence: 99%

Section: Surfactant Packing In the Diluted Regimementioning

confidence: 99%

Section: Adsorbed Amount and Layer Thickness Upon Rinsingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Facile control of surfactant lamellar phase transition and adsorption behavior

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Processing effects on bilayer structures formation and rheological behavior of softeners using cationic di(hydrogenated tallow)dimethylammonium chloride aqueous dispersions

de Castro,

Ferreira,

Loh

2024

J Surfact & Detergents

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The use of softeners is essential for enhancing laundered fabrics and hair textures after washing. For these, products based on double‐tailed cationic surfactants are used to reduce friction and static electricity, resulting in softer and smoother fibers. These surfactants form lamellar phases in water, which can be turned into vesicles and other bilayer aggregates upon shearing, greatly impacting on the rheological properties of these formulations. This study aims at elucidating how some parameters of the formulation process impact bilayer structures formation and the product rheology, using di(hydrogenated tallow)dimethylammonium chloride (DHTDMAC) aqueous dispersions as model system. Small angle X‐ray scattering (SAXS) analyses revealed lamellar phases starting from 3% DHTDMAC, with a bilayer thickness of 1.90 ± 0.03 nm, indicating significant carbon chain interdigitation. At this concentration (3%), bilayers exhibited a repetition distance of 69 nm, unveiling a behavior close to the one predicted for infinite swelling, in which lamellar structures persisted even at high dilution. Temperature plays a significant role in the rheological behavior, with elevated temperatures favoring vesicle formation, resulting in reduced apparent viscosity due to lower resistance of vesicles to flow. Upon heating, differential scanning calorimetry (DSC) analyses revealed a transition from Lβ (gel) to Lα (fluid) structures between 28 and 41°C, which was further confirmed by X‐ray diffraction (XRD). Both structural and thermotropic features observed were discussed and compared to information reported for a high‐purity grade homologue of DHTDMAC, dioctadecyldimethylammonium chloride (DODAC) mixed with water. These findings deepen the understanding of fabric softener formulation and the impact of bilayer structures formation on their properties, and should be used to optimize new formulations, enhancing their overall performance and sensorial quality.

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Surfactant‐Templated Synthesis of High‐Performance Noble Metal Electrocatalysts: A Case of Dioctadecyldimethylammonium Chloride

Fan,

Lv,

Sun

et al. 2024

Small Structures

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Mesoscopic structures of noble metal (NM) nanomaterials are important parameters that remarkably affect physicochemical properties and electrocatalytic performances. To date, various synthesis strategies have been proposed to prepare NM nanomaterials with well‐defined mesoscopic structures. Specifically, amphiphilic surfactants that chemically composed of hydrophobic tail(s) and hydrophilic head(s) have been utilized as functional templates to precisely engineer mesoscopic structures of NM nanomaterials and further optimize their electrochemical performance. Compared with traditional surfactants, dioctadecyldimethylammonium chloride (DODAC) is a functional amphiphilic surfactant that can assemble into vesical and cylinder micelles and thus template precise synthesis of NM nanomaterials with various advanced structures. In this review, recent developments in DODAC‐templated synthesis of high‐performance NM electrocatalysts with a specific focus on the findings in the group are presented. Three kinds of advanced NM mesoscopic structures, including one‐dimensional (1D) nanowires, three‐dimensional (3D) mesoporous nanospheres (MSs), and sophisticated hollow/asymmetric MSs, are described in detail. Meanwhile, the applications in various electrocatalytic reactions are presented to highlight high activity, selectivity, and stability of NM electrocatalysts. This review provides some insights into both synthesis and application exploration of high‐performance NM electrocatalysts by templated synthesis of amphiphilic surfactants.

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Elucidating the effect of additives on the alkyl chain packing of a double tail cationic surfactant

Cited by 15 publications

References 48 publications

Facile control of surfactant lamellar phase transition and adsorption behavior

Facile control of surfactant lamellar phase transition and adsorption behavior

Processing effects on bilayer structures formation and rheological behavior of softeners using cationic di(hydrogenated tallow)dimethylammonium chloride aqueous dispersions

Surfactant‐Templated Synthesis of High‐Performance Noble Metal Electrocatalysts: A Case of Dioctadecyldimethylammonium Chloride

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