Colloidal particle adsorption at liquid interfaces: capillary driven dynamics and thermally activated kinetics

Rahmani, Amir M.; Wang, Anna; Manoharan, Vinothan N.; Colosqui, Carlos E.

doi:10.1039/c6sm00966b

Cited by 29 publications

(46 citation statements)

References 45 publications

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“…For example, single microparticles adsorbed at liquid-liquid interfaces have exhibited crossovers from initially fast dynamics, driven by capillary forces, to a much slower "kinetic" relaxation that can be nearly logarithmic in time, as first discovered by Kaz et al 5 and subsequently studied by other groups. [6][7][8][9][10] Similar near-equilibrium behavior has been also observed in the imbibition/drainage of water/oil in microscale capillaries with nanoscale surface roughness. 11 The observed near-equilibrium phenomena, resembling physical ageing in dense colloidal systems that exhibit jamming transitions, [12][13][14][15] have been attributed to random thermally activated transitions between multiple metastable states induced by numerous nanoscale "defects" on the solid surface.…”

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confidence: 65%

“…Although the dynamics of spontaneous droplet spreading has been extensively investigated, [16][17][18][19][20][21][22][23][24][25] to the best of our knowledge no previous study has reported a crossover from capillary driven dynamics and power-law spreading to slow logarithmic relaxation and physical ageing behavior and a) carlos.colosqui@stonybrook.edu analogous to that observed for the adsorption of single colloidal particles. [5][6][7]10 Spreading studies have established that the droplet contact radius R in different dynamic regimes follows a power law R(t) ∝ t α with exponents α varying from 0.1 to 1. Spreading regimes where R(t) ∝ t 0.5 have been observed at short initial times where inertial effects are significant, for droplets of liquids with low viscosity ( 10 mPa·s) immersed in a gas/vapor phase.…”

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confidence: 99%

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Physical ageing of spreading droplets in a viscous ambient phase

Jose

Nandyala

Cubaud

et al. 2018

Sci Rep

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In this work, we study the spontaneous spreading of water droplets immersed in oil and report an unexpectedly slow kinetic regime not described by previous spreading models. We can quantitatively describe the observed regime crossover and spreading rate in the late kinetic regime with an analytical model considering the presence of periodic metastable states induced by nanoscale topographic features (characteristic area ~4 nm2, height ~1 nm) observed via atomic force microscopy. The analytical model proposed in this work reveals that certain combinations of droplet volume and nanoscale topographic parameters can significantly hinder or promote wetting processes such as spreading, wicking, and imbibition.

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confidence: 65%

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confidence: 99%

Physical ageing of spreading droplets in a viscous ambient phase

Jose

Nandyala

Cubaud

et al. 2018

Sci Rep

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“…37 In fact, it has been previously shown that the presence of the double layer provides an electrostatic barrier and can retard or prevent the adsorption of particles at soft interfaces. 38,39 The intensity of this barrier can be surprisingly higher than the hydrodynamic forces pushing the particle towards the droplet. 40,41 As a result of that, even in the presence of weak forces, external work must be often applied via high shear or sonication in order to observe adsorption of particles at a reasonable rate, which would confirm our results.…”

Section: On the Adsorption Of The Pickering Stabilizer Onto Monomer Dmentioning

confidence: 99%

A mechanistic investigation of Pickering emulsion polymerization

Lotierzo

Bon

2017

Polym. Chem.

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A note on versions:The version presented here may differ from the published version or, version of record, if you wish to cite this item you are advised to consult the publisher's version. Please see the 'permanent WRAP URL' above for details on accessing the published version and note that access may require a subscription. Pickering emulsion polymerization offers a versatile way of synthetising hybrid core-shell latexes where a polymer core is surrounded by an armour of inorganic nanoparticles. A mechanistic understanding of the polymerization process is limited which restricts the use of the technique in the fabrication of more complex, multilayered colloids. In this paper clarity is provided through an in-depth investigation into the Pickering emulsion polymerization of methyl methacrylate (MMA) in the presence of nano-sized colloidal silica (Ludox TM-40). Mechanistic insights are discussed by studying both the adsorption of the stabiliser to the surface of the latex particles and polymerization kinetics. The adhesion of the Pickering nanoparticles was found not to be spontaneous, as confirmed by cryo-TEM analysis of MMA droplets in water and monomer-swollen PMMA latexes. This supports the theory that the inorganic particles are driven towards the interface as a result of a heterocoagulation event in the water phase with a growing oligoradical. The emulsion polymerizations were monitored by reaction calorimetry in order to establish accurate values for monomer conversion and the overall rate of polymerizations (Rp). Rp increased for higher initial silica concentrations and the polymerizations were found to follow pseudo-bulk kinetics.

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“…We note that these models capture only the gross features of the trajectories. A more recent model [26] …”

Section: Introductionmentioning

confidence: 99%

Contact-line pinning controls how quickly colloidal particles equilibrate with liquid interfaces

et al. 2016

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Previous experiments have shown that spherical colloidal particles relax to equilibrium slowly after they adsorb to a liquid-liquid interface, despite the large interfacial energy gradient driving the adsorption. The slow relaxation has been explained in terms of transient pinning and depinning of the contact line on the surface of the particles. However, the nature of the pinning sites has not been investigated in detail. We use digital holographic microscopy to track a variety of colloidal spheres-inorganic and organic, charge-stabilized and sterically stabilized, aqueous and non-aqueous-as they breach liquid interfaces. We find that nearly all of these particles relax logarithmically in time over timescales much larger than those expected from viscous dissipation alone. By comparing our results to theoretical models of the pinning dynamics, we infer the area per defect to be on the order of a few square nanometers for each of the colloids we examine, whereas the energy per defect can vary from a few kT for non-aqueous and inorganic spheres to tens of kT for aqueous polymer particles. The results suggest that the likely pinning sites are topographical features inherent to colloidal particles-surface roughness in the case of silica particles and grafted polymer "hairs" in the case of polymer particles. We conclude that the slow relaxation must be taken into

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Colloidal particle adsorption at liquid interfaces: capillary driven dynamics and thermally activated kinetics

Cited by 29 publications

References 45 publications

Physical ageing of spreading droplets in a viscous ambient phase

Physical ageing of spreading droplets in a viscous ambient phase

A mechanistic investigation of Pickering emulsion polymerization

Contact-line pinning controls how quickly colloidal particles equilibrate with liquid interfaces

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