Diffusiophoresis of a highly charged soft particle normal to a conducting plane

Wu, Yvonne; Lee, Eric

doi:10.1002/elps.202100052

Cited by 10 publications

(5 citation statements)

References 38 publications

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“…Among them, Shin and his coworkers reported many excellent experimental explorations with valuable outcomes [10][11][12]17,28,31]. Lee and his coworkers, on the other hand, launched a series of theoretical studies on diffusiophoretic motions of dielectric droplets as well as soft particles recently, motivated by the possible applications in drug delivery in particular [32][33][34][35][36]. Very recently, the diffusiophoretic motion of a highly charged conducting droplet was investigated by Lee and his coworkers as well, focusing on the chemiphoresis component in particular, where the droplet motion is induced solely by the solute concentration gradient [30].…”

Section: Introductionmentioning

confidence: 99%

Diffusiophoresis of a Weakly Charged Liquid Metal Droplet

Fan

Lin

et al. 2023

Molecules

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Diffusiophoresis of a weakly charged liquid metal droplet (LMD) is investigated theoretically, motivated by its potential application in drug delivery. A general analytical formula valid for weakly charged condition is adopted to explore the droplet phoretic behavior. We determined that a liquid metal droplet, which is a special category of the conducting droplet in general, always moves up along the chemical gradient in sole chemiphoresis, contrary to a dielectric droplet where the droplet tends to move down the chemical gradient most of the time. This suggests a therapeutic nanomedicine such as a gallium LMD is inherently superior to a corresponding dielectric liposome droplet in drug delivery in terms of self-guiding to its desired destination. The droplet moving direction can still be manipulated via the polarity dependence; however, there should be an induced diffusion potential present in the electrolyte solution under consideration, which spontaneously generates an extra electrophoresis component. Moreover, the smaller the conducting liquid metal droplet is, the faster it moves in general, which means a smaller LMD nanomedicine is preferred. These findings demonstrate the superior features of an LMD nanomedicine in drug delivery.

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Section: Introductionmentioning

confidence: 99%

Diffusiophoresis of a Weakly Charged Liquid Metal Droplet

Fan

Lin

et al. 2023

Molecules

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“…The electrokinetic behavior of a conducting droplet is much simpler compared with a dielectric droplet. Lee and his coworkers have conducted a series of theoretical studies on the phoretic motions of highly charged droplets, both dielectric and conducting, and both electrophoresis and diffusiophoresis, based on a pseudo-spectral method numerically [20][21][22][23][24][25]. In addition, a general analytical formula is obtained valid for weakly charged droplets under the Debye-Hückel approximation.…”

Section: Introductionmentioning

confidence: 99%

Electrophoresis of a highly charged fluid droplet in dilute electrolyte solutions: Analytical Hückel‐type solution

et al. 2022

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An analytical formula is presented here for the electrophoresis of a dielectric or perfectly conducting fluid droplet with arbitrary surface potentials suspended in a very dilute electrolyte solution. In other words, when the Debye length (κ −1 ) is very large, or κa≪1, where κ is the electrolyte strength and a stands for the droplet radius. This formula can be regarded as an extension of the famous Hückel solution valid for weakly charged rigid particles to arbitrarily charged fluid droplets. The formula reduces successfully to the ones obtained by Booth for a dielectric droplet, and Ohshima for a perfectly conducting droplet, both under Debye-Hückel approximation valid for weakly charged droplets. Moreover, the formula is valid for a gas bubble and a rigid solid particle as well. Classic results obtained by Hückel for a rigid particle are reproduced as well. We found that for a dielectric droplet, the more viscous the droplet is, the faster it moves regardless of its surface potential, contrary to the intuition based on the purely hydrodynamic consideration. For a perfectly conducting liquid droplet, on the other hand, the situation is reversed: The less viscous the droplet is, the faster it moves. The presence or absence of the spinning electric driving force tangent to the droplet surface is found to be responsible for it. As a result, an axisymmetric exterior vortex flow surrounding the droplet is always present for a dielectric liquid droplet, and never there for a conducting liquid droplet.

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“…On the other hand, diffusiophoresis, the motion of a particle in response to a solute concentration gradient in a solution, has emerged as a competitive driving force to manipulate colloidal particles in colloid science and technology [5]. In particular, it has potential applications in drug delivery due to its self-guiding nature and negligible Joule heating effect [6][7][8], a crucial factor to consider as a raise of 4°C is fatal to mammalian cells [9]. As a result, understanding the diffusiophoretic behavior of a fluid droplet is a very important issue in order to control and convey the drug-carrying droplets like liposomes to their desired destination [10,11].…”

Section: Introductionmentioning

confidence: 99%

Analytical solution to dielectric droplet diffusiophoresis under Debye–Hückel approximation

Tsai

Fan

et al. 2021

Electrophoresis

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A simple analytical formula is obtained for the diffusiophoresis of a dielectric fluid droplet in symmetric binary electrolyte solutions under Debye-Hückel approximation valid for weakly charged droplets. The chemiphoresis is found to yield negative mobilities most of the time for droplets of constant surface charge density, which implies that the droplets tend to move away from the source releasing ionic chemicals. This is undesirable in some practical applications like drug delivery with liposomes in terms of conveying the drugcarrying liposomes to the desired area in the human body releasing specific ionic chemicals utilizing the self-guiding nature of diffusiophoresis. The further involvement of the electrophoresis component, however, may change the scenario via the oriented electric field generated by the induced diffusion potential. The lesson here is that while the impact of the chemiphoresis component is determined by nature and uncontrollable, the electrophoresis component serves as an artificially adjustable factor via choosing droplets with the surface charge of appropriate sign in practical applications. The results here have potential use in practical applications such as drug delivery. The portable simple analytical formula is a powerful asset to experimental researchers and design engineers in colloid science and technology to facilitate their works.

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Diffusiophoresis of a highly charged soft particle normal to a conducting plane

Cited by 10 publications

References 38 publications

Diffusiophoresis of a Weakly Charged Liquid Metal Droplet

Diffusiophoresis of a Weakly Charged Liquid Metal Droplet

Electrophoresis of a highly charged fluid droplet in dilute electrolyte solutions: Analytical Hückel‐type solution

Analytical solution to dielectric droplet diffusiophoresis under Debye–Hückel approximation

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