Synergy, competition, and the “hanging” polymer layer: Interactions between a neutral amphiphilic ‘tardigrade’ comb co-polymer with an anionic surfactant at the air-water interface

Slastanova, Anna; Campbell, Richard A.; Snow, Tim; Mould, Elizabeth; Li, Peixun; Welbourn, Rebecca J. L.; Chen, Meng; Robles, Eric S. J.; Briscoe, Wuge H.

doi:10.1016/j.jcis.2019.11.017

Cited by 21 publications

(36 citation statements)

References 60 publications

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“…Table 1) compared to that of glycerol (64.0 mN m -1 ). This is also consistent with a lower minimum surface tension at the air-water interface (γ min = 38.3 mN m -1 ) 44 compared to that at the air-glycerol interface (γ min = 46.0 mN m -1 ). Lastly, the optimal headgroup area, A HG , can be determined through calculation of the surface excess Γ = -(dγ/dln(c SDS ))/2RT in the linear region in the γ-ln(c SDS ) plot preceding the CMC.…”

Section: Surface Tensiometry Of Sds In Glycerolsupporting

confidence: 83%

“…Lastly, the optimal headgroup area, A HG , can be determined through calculation of the surface excess Γ = -(dγ/dln(c SDS ))/2RT in the linear region in the γ-ln(c SDS ) plot preceding the CMC. As shown in Table 1, SDS had a similar optimal headgroup area A HG = 46.0 Å 2 at the air-glycerol interface than that at the air-water interface (A HG = 43.5 Å 2 ) 44 .…”

Section: Surface Tensiometry Of Sds In Glycerolmentioning

confidence: 85%

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The curious case of SDS self-assembly in glycerol: Formation of a lamellar gel

Matthews

Przybyłowicz

Rogers

et al. 2020

Journal of Colloid and Interface Science

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Hypothesis -Hydrogen-bonding capacities of polar nonaqueous media significantly affect selfassembly behaviours of surfactants in these media.Introduction -Glycerol, a nonaqueous hydrogen-bonding solvent, is widely used in industrial formulations due to its desirable physical properties. Surfactants are ubiquitous in such applications; however, surfactant self-assembly in glycerol is not well understood.Methods -The microscopic structure of the gel phase was studied using a series of imaging techniques: polarised light microscopy (PLM), confocal laser scanning microscopy (CLSM), and environmental scanning electron microscopy (ESEM). The rheological properties of the gel were studied using viscometry and oscillation rheology measurements. Further nanostructural characterisation was carried out using small-angle neutron scattering (SANS).Results -We have observed the unexpected formation of a microfibrillar gel in SDS and glycerol mixtures at a critical gelation concentration (CGC) as low as ~ 2 wt%; such SDS gelation has not been observed in aqueous systems. The microscopic structure of the gel consisted of microfibres some mm in length and with an average diameter of D ~ 0.5 μm. The fibres in the gel phase exhibited shear-induced alignment in the viscometry measurements, and oscillation tests showed that the gel was viscoelastic, with an elastic-dominated behaviour. Fitting to SANS profiles showed lamellar nano-structures in the gel microfibres at room temperature, transforming into cylindrical-micellar solutions above a critical gelation temperature, T CG ~ 45 o C.Conclusions -These unprecedented observations highlight the markedly different selfassembly behaviours in aqueous and nonaqueous H-bonding solvents, which is not currently well understood. Deciphering such self-assembly behaviour is key to furthering our understanding of self-assembly on a fundamental level.

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Section: Surface Tensiometry Of Sds In Glycerolsupporting

confidence: 83%

Section: Surface Tensiometry Of Sds In Glycerolmentioning

confidence: 85%

The curious case of SDS self-assembly in glycerol: Formation of a lamellar gel

Matthews

Przybyłowicz

Rogers

et al. 2020

Journal of Colloid and Interface Science

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“…As discussed above, such interactions were observed already in the initial stages (t < 0.85 s) of adsorption in the presence of both PS-mixtures. Similar observations have been made by scholars studying various PS-mixtures (Noskov et al, 2007;Petkova et al, 2012;Slastanova et al, 2020), but the results presented here represent the first such observations with a nonionic polymer and a nonionic surfactant pair (to the best knowledge of the author).…”

Section: Dynamic Adsorption Propertiessupporting

confidence: 87%

Amphiphilic cellulose and surfactant mixtures as green frothers in mineral flotation. 2. Flotation of chalcopyrite and Cu-containing tailings

Nuorivaara

Serna-Guerrero

2020

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…The liquid film becomes thinner because of Plateau drainage. When the bubble film is thin to some extent, bubble breaks [76]. The dynamic properties of the film are crucial for the drainage of bubble film [77].…”

Section: Surface Tensionmentioning

confidence: 99%

“…The addition of sodium salt electrolyte will weaken the repulsion force between hydrophilic ions, increase the adsorption capacity of surfactant molecules on the surface, arrange the surfactant molecules more closely, and increase the ability of air-entraining agent [94,122]. The foam stability measurements (the foam half-life, height, and initial bubble size) showed that the foam stability was enhanced by some polymer, when compared to pure sodium dodecyl sulfate (an anionic surfactant) solutions [76].…”

Section: Salt Admixturesmentioning

confidence: 99%

A Review on Bubble Stability in Fresh Concrete: Mechanisms and Main Factors

et al. 2020

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In order to improve the stability of air bubbles in fresh concrete, it is of great significance to have a better understanding of the mechanisms and main influencing factors of bubble stability. In the present review, the formation and collapse process of air bubbles in fresh concrete are essentially detailed; and the advances of major influencing factors of bubble stability are summarized. The results show that the surface tension of air–liquid interface exerts a huge impact on bubble stability by reducing surface free energy and Plateau drainage, as well as increasing the Gibbs surface elasticity. However, surface tension may not be the only determinant of bubble stability. Both the strength of bubble film and the diffusion rate of air through the membrane may also dominate bubble stability. The application of nano-silica is a current trend and plays a key role in ameliorating bubble stability. The foam stability could be increased by 6 times when the mass fraction of nano-particle reached 1.5%.

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Synergy, competition, and the “hanging” polymer layer: Interactions between a neutral amphiphilic ‘tardigrade’ comb co-polymer with an anionic surfactant at the air-water interface

Cited by 21 publications

References 60 publications

The curious case of SDS self-assembly in glycerol: Formation of a lamellar gel

The curious case of SDS self-assembly in glycerol: Formation of a lamellar gel

Amphiphilic cellulose and surfactant mixtures as green frothers in mineral flotation. 2. Flotation of chalcopyrite and Cu-containing tailings

A Review on Bubble Stability in Fresh Concrete: Mechanisms and Main Factors

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