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- W2902675032 abstract "Abstract Diffusiophoretic motion of a single liquid droplet or a gas bubble and their suspensions are considered in this chapter. Similar to the corresponding electrophoresis phenomenon considered in Chapter 12 , the mobile droplet or bubble surface induces a strong electroosmosis flow (EOF) of counterions relative to the moving particle, which reduces the hydrodynamic drag force significantly, and hence, leads to drastic increase of droplet or bubble velocity. Whether the initiating driving force is from an applied electric field as in electrophoresis or from an imposed concentration gradient as considered here for diffusiophoresis apparently does not change the fundamental scenario of the droplet or bubble motion. The magnitude of the latter is smaller than the former, although they belong to the same order. The comparison may not be realistic as there is no direct conversion between an imposed concentration gradient and an externally applied electric field. It is like comparing an apple with an orange. However, mathematically speaking, this may still make some sense in terms of dimensionless variables. Note that the induced EOF may also be analogized as an effective excessive surface conductivity due to the mobile droplet or bubble surface, which drastically increases the electric driving force as κa is large (thin double layer), due to the double layer suppression effect. General Henry's charts are provided for both KCl (β = 0) and NaCl (β = − 0.2) electrolyte solutions. Effect of the droplet viscosity is examined in particular, among other electrokinetic parameters investigated for their respective effect upon the droplet or bubble motion. The diffusiophoretic motion of droplets has promising potential in the enhanced oil recovery by driving the oil droplets out of dead-end-pore type of void space in a porous reservoir by the concentration gradient of electrolyte solution, which is injected into the system to pump out remaining oil. It can also be used in the controlled release of drugs utilizing encapsulated droplets as the carrier, which has enormous potential in the applications in biomedical and biochemical fields, as the target area in human body often releases specific chemicals to build up a concentration gradient guiding the moving direction of the drugs in droplets." @default.
- W2902675032 created "2018-12-11" @default.
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- W2902675032 date "2019-01-01" @default.
- W2902675032 modified "2023-09-23" @default.
- W2902675032 title "Diffusiophoresis of Liquid Droplets and Gas Bubbles" @default.
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- W2902675032 doi "https://doi.org/10.1016/b978-0-08-100865-2.00017-5" @default.
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