Diffusiophoresis in electrolyte solutions and its role in the Mechanism of the formation of films from caoutchouc latexes by the ionic deposition method

Derjaguin, B.V.; Dukhin, S. S.; Korotkova, A. A.

doi:10.1016/0079-6816(93)90024-p

Cited by 69 publications

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“…Fluorescent, sulfonated polystyrene (PS) colloids (Materials and Methods) move diffusiophoretically down SDS concentration gradients ( Fig. 2 A and B) (Movie S1), consistent with electro-DP (35,37), treating the (ionic) surfactant SDS as an electrolyte. By contrast, decane drops (Materials and Methods) migrate up SDS gradients ( Fig.…”

Section: Soluto-inertial Beaconmentioning

confidence: 99%

“…Theories for diffusiophoretic mobilities involve the relative excess (or depletion) of the solute near the particle surface, which is forced into motion by solute gradients in the bulk solution. Such theories have been developed for gradients of electrolytes (35,37) and nonelectrolytes (51), yet difficulties in establishing sufficiently strong, stable gradients have prevented systematic experimental measurements (as is routine for electrophoresis). Recent developments in microfluidics, however, have enabled more direct studies of DP (40,(52)(53)(54)(55)(56).…”

Section: Soluto-inertial Beaconmentioning

confidence: 99%

“…These interactions exploit diffusiophoresis (DP)-the migration of suspended particles and droplets in response to gradients or fluxes of solute (35)(36)(37)(38) or solvent ("solvophoresis") (39,40). Such gradients arise spontaneously around…”

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confidence: 99%

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Soluto-inertial phenomena: Designing long-range, long-lasting, surface-specific interactions in suspensions

Banerjee

Williams

Azevedo

et al. 2016

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

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Equilibrium interactions between particles in aqueous suspensions are limited to distances less than 1 μm. Here, we describe a versatile concept to design and engineer nonequilibrium interactions whose magnitude and direction depends on the surface chemistry of the suspended particles, and whose range may extend over hundreds of microns and last thousands of seconds. The mechanism described here relies on diffusiophoresis, in which suspended particles migrate in response to gradients in solution. Three ingredients are involved: a soluto-inertial "beacon" designed to emit a steady flux of solute over long time scales; suspended particles that migrate in response to the solute flux; and the solute itself, which mediates the interaction. We demonstrate soluto-inertial interactions that extend for nearly half a millimeter and last for tens of minutes, and which are attractive or repulsive, depending on the surface chemistry of the suspended particles. Experiments agree quantitatively with scaling arguments and numerical computations, confirming the basic phenomenon, revealing design strategies, and suggesting a broad set of new possibilities for the manipulation and control of suspended particles.olloidal suspensions and emulsions of 10-nm to 10-μm particles play a central role in a wide variety of industrial, technological, biological, and everyday processes. Everyday goods, including shampoos, inks, vaccines, paints, and foodstuffs as well as industrial products such as drilling muds, ceramics, and pesticides, rely fundamentally on stably suspended microparticles for their creation and/or operation. This incredible versatility derives from the extensive variety of properties (e.g., mechanical, optical, and chemical) attainable in suspension through a generic set of physicochemical strategies (1-4). A proper understanding of the stability and dynamics of suspensions in general thus underpins both fundamental science and technological applications.The properties and performance of suspensions depend preeminently on the effective interactions between particles. The celebrated Derjaguin-Landau-Verwey-Overbeek (DLVO) theory (5-7) balances electrostatic interactions (typically repulsive) between charged colloids-as screened by ions in the surrounding electrolyte-against van der Waals attractions, and successfully predicts the stability, phase behavior, and response of electrostatically stabilized suspensions. Additional (non-DLVO) forces can also be used to stabilize or destabilize colloidal suspensions. Grafted or adsorbed macromolecules provide short-range steric repulsions that stabilize suspended particles against van der Waals-induced flocculation (8-11). By contrast, nonadsorbed macromolecules that remain dispersed in solution introduce entropic depletion attractions whose strength and range is set by the size and concentration of depletants (12, 13). Such depletion interactions scale with thermal energy (k B T), and thus enable tunable and reversible attractions (14, 15). Clever design of shaped or patterned coll...

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Section: Soluto-inertial Beaconmentioning

confidence: 99%

Section: Soluto-inertial Beaconmentioning

confidence: 99%

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Soluto-inertial phenomena: Designing long-range, long-lasting, surface-specific interactions in suspensions

Banerjee

Williams

Azevedo

et al. 2016

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

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“…In particular, surfaces that react, dissolve, or equilibrate naturally establish concentration gradients of various species and can enhance or retard the deposition of particles or polymers. In some cases, this deposition is intentionalfor example, in the growth of polymer films and other coatings 1,5,6 whereas in other cases it is undesired (e.g., contamination and fouling 7 ). Diffusiophoresis has also received recent attention for its importance to self-propelling particles 8−11 and active matter 12−14 as well as direct observations of exclusion zones around membranes 15 and diffusioosmotic "pumps" established by dissolving salt crystals.…”

Section: ■ Introductionmentioning

confidence: 99%

Direct Measurements of Colloidal Solvophoresis under Imposed Solvent and Solute Gradients

et al. 2015

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We describe a microfluidic system that enables direct visualization and measurement of diffusiophoretic migration of colloids in response to imposed solution gradients. Such measurements have proven difficult or impossible in macroscopic systems due to difficulties in establishing solution gradients that are sufficiently strong yet hydrodynamically stable. We validate the system with measurements of the concentration-dependent diffusiophoretic mobility of polystyrene colloids in NaCl gradients, confirming that diffusiophoretic migration velocities are proportional to gradients in the logarithm of electrolyte concentration. We then perform the first direct measurement of the concentration-dependent "solvophoretic" mobility of colloids in ethanol−water gradients, whose dependence on concentration and gradient strength was not known either theoretically or experimentally, but which our measurements reveal to be proportional to the gradient in the logarithm of ethanol mole fraction. Finally, we examine solvophoretic migration under a variety of qualitatively distinct chemical gradients, including solvents that are miscible or have finite solubility with water, an electrolyte for which diffusiophoresis proceeds down concentration gradients (unlike for most electrolytes), and a nonelectrolyte (sugar). Our technique enables the direct characterization of diffusiophoretic mobilities of various colloids under various solvent and solute gradients, analogous to the electrophoretic ζ-potential measurements that are routinely used to characterize suspensions. We anticipate that such measurements will provide the feedback required to test and develop theories for solvophoretic and diffusiophoretic migration and ultimately to the conceptual design and engineering of particles that respond in a desired way to their chemical environments.

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“…Thus the matter flux is provided by the "diffusiophoresis" (∝ ∇φ; this term was proposed by Derjaguin et al [11]), thermophoresis (∝ ∇T ), and magnetophoresis (∝ ∇H). If, however, confined horizontal planes are impervious and an applied magnetic field is uniform, then gradients of φ and H can be caused only by an imposed temperature gradient.…”

Section: Magnetophoresis and Soret Effectmentioning

confidence: 99%

Convective Instability of Magnetized Ferrofluids: Influence of Magnetophoresis and Soret Effect

Shliomis

2002

Thermal Nonequilibrium Phenomena in Fluid Mixtures

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Abstract. Convective instability in a ferrofluid layer heated from below or from above in the presence of a uniform vertical magnetic field is investigated theoretically. Convection is caused by a magnetic mechanism based on the temperature and concentration dependence of magnetization. An imposed temperature gradient establishes (by the Soret effect) a concentration gradient of magnetic particles of which the ferrofluid is composed. Both these gradients cause a spatial variation in magnetization, which induces a gradient of magnetic field intensity within the fluid layer. The field gradient induces in its turn an additional redistribution of magnetic grains due to magnetophoresis. Resulting self-consistent magnetic force tries to mix the fluid. A linear stability analysis predicts oscillatory instability in a certain region of the magnetic field strength and the fluid parameters. The instability owes magneto-and thermophoresis its origin: were the particle diffusion not operative, then only stationary instability would occur. A discovery of predicted convective oscillations is expected in ferrofluid layers about 1 mm thick, where the buoyancy mechanism is negligible and the characteristic diffusion time is not too long.

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Diffusiophoresis in electrolyte solutions and its role in the Mechanism of the formation of films from caoutchouc latexes by the ionic deposition method

Cited by 69 publications

References 0 publications

Soluto-inertial phenomena: Designing long-range, long-lasting, surface-specific interactions in suspensions

Soluto-inertial phenomena: Designing long-range, long-lasting, surface-specific interactions in suspensions

Direct Measurements of Colloidal Solvophoresis under Imposed Solvent and Solute Gradients

Convective Instability of Magnetized Ferrofluids: Influence of Magnetophoresis and Soret Effect

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