Structural forces in soft matter systems: unique flocculation pathways between deformable droplets

Tabor, Richard Francis; Lockie, Hannah; Chan, Derek Y. C.; Grieser, Franz; Grillo, Isabelle; Mutch, Kevin J.; Dagastine, Raymond R.

doi:10.1039/c1sm06326j

Cited by 36 publications

(50 citation statements)

References 53 publications

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“…The structure factors of the glasses with added salt and surfactant almost have a double-peak structure, with greater magnitude on the high-q side. This is consistent with the screening of the repulsive double-layer potential by salt and the fact that surfactant adds a short-range attraction to the potential (20,21). The pairdistances encompassed by the broad first-nearest neighbor peak generally arise from a set of polyhedra with different populations.…”

Section: Experimental Methods and Symmetry Analysissupporting

confidence: 78%

“…Thus, the local order quenched into the glass reflects the stable phase in the liquid and in the dispersion at lower packing fractions. The addition of surfactant at sufficient concentration creates a short-range attractive component in the potential (20,21), and the more efficiently packed ICO clusters are the most populous in the glass, as we see in Fig. 4C.…”

Section: Local Structures In Centrifuged Glasses and A Sedimented Pacmentioning

confidence: 65%

“…Salt screens the repulsive electrical double-layer force between particles that arises from surface charging in water, reducing the range of interaction. Added surfactant (nonionic; Tween20) results in a shortrange attractive component to the potential due to an osmotic depletion force from the presence of micelles (20,21). Fig.…”

Section: Experimental Methods and Symmetry Analysismentioning

confidence: 99%

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Favored local structures in amorphous colloidal packings measured by microbeam X-ray diffraction

Liu

Tabor

Jonge

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

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Local structure and symmetry are keys to understanding how a material is formed and the properties it subsequently exhibits. This applies to both crystals and amorphous and glassy materials. In the case of amorphous materials, strong links between processing and history, structure and properties have yet to be made because measuring amorphous structure remains a significant challenge. Here, we demonstrate a method to quantify proportions of the bond-orientational order of nearest neighbor clusters [Steinhardt, et al. (1983) 28:784-805] in colloidal packings by statistically analyzing the angular correlations in an ensemble of scanning transmission microbeam small-angle X-ray scattering (SAXS) patterns. We show that local order can be modulated by tuning the potential between monodisperse, spherical colloidal silica particles using salt and surfactant additives and that more pronounced order is obtained by centrifugation than sedimentation. The order in the centrifuged glasses reflects the ground state order in the dispersion at lower packing fractions. This diffraction-based method can be applied to amorphous systems across decades in length scale to connect structure to behavior in disordered systems with a range of particle interactions.

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Section: Experimental Methods and Symmetry Analysissupporting

confidence: 78%

Section: Local Structures In Centrifuged Glasses and A Sedimented Pacmentioning

confidence: 65%

Section: Experimental Methods and Symmetry Analysismentioning

confidence: 99%

See 1 more Smart Citation

Favored local structures in amorphous colloidal packings measured by microbeam X-ray diffraction

Liu

Tabor

Jonge

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

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“…1). The scattering data were obtained from previous work, 5 and pseudo-structure factors were calculated by dividing the raw scattering data by the calculated micelle volume fraction and a form factor used consistently across all concentrations, representing hard spheres of radius 18.5 Å, after Bartlett and Ottewill. 24 This method, although somewhat crude in its assumptions (i.e.…”

Section: Resultsmentioning

confidence: 99%

“…3 Well-studied examples include micelles formed from ionic surfactants, polymer, metal and oxide particles and charged globular proteins and polyelectrolytes. 1 As well as wide applications in the analysis and quantitative modelling of data from small-angle X-ray, neutron and light scattering, the charged-sphere structure factor is central to many other correlative analyses of fluid systems including theoretical studies of colloidal glasses, 4 structural forces in rigid and deformable systems 5,6 and Monte Carlo simulations of interacting systems. 7 Thus, a method to quickly and easily calculate charged-sphere structure factors while still having access to the fitting equations and process is of interest to a number of fields.…”

Section: Introductionmentioning

confidence: 99%

A simple and accurate method for calculation of the structure factor of interacting charged spheres

Chan

Tabor

2014

Journal of Colloid and Interface Science

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Surfactant‐Enhanced Adsorption of Graphene Oxide for Improved Emulsification of Oil in Water

McCoy

Holt

Rozario

et al. 2017

Adv Materials Inter

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Graphene oxide (GO) can be enriched at the air-water interface by the adsorption of surfactant molecules to the surfaces of the GO sheets. The synergism between the surfactant and GO is shown to be responsible for the improved interfacial performance of the composite through a subtle balance of surface charge and surface activity. The use of a photo-addressable surfactant provides a unique probe for investigating the fundamental mechanisms that control adsorption, by inducing spatiotemporal modulation of the surfactant properties by irradiation with light of certain wavelengths. Tensiometry measurements uncovered the interfacial activity of the materials, whereas x-ray reflectivity served to independently determine the interfacial structure and composition. The ratio between the surfactant and GO appeared to be the key factor controlling adsorption, with pH and salt offering additional finer control of interfacial properties. This synergism This article is protected by copyright. All rights reserved. 2between GO sheets and a surface active small molecule surfactant was utilized to stabilise oil-in-water emulsions with unprecedented effectiveness.

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Structural forces in soft matter systems: unique flocculation pathways between deformable droplets

Cited by 36 publications

References 53 publications

Favored local structures in amorphous colloidal packings measured by microbeam X-ray diffraction

Favored local structures in amorphous colloidal packings measured by microbeam X-ray diffraction

A simple and accurate method for calculation of the structure factor of interacting charged spheres

Surfactant‐Enhanced Adsorption of Graphene Oxide for Improved Emulsification of Oil in Water

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