Reversible Pattern Formation through Photolysis

Kline, Timothy R.; Sen, Ayusman

doi:10.1021/la061165+

Cited by 26 publications

(23 citation statements)

References 29 publications

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“…Compared to conventional electrophoresis operations, diffusiophoresis has the advantages such as no Joules heat effect and metals in electrical contact . Diffusiophoresis has been adopted in applications such as separation and purification , surface adhesion and coating , pattern formation . It has also been used as a novel driving mechanism for catalytic nano‐ or micromotors .…”

Section: Introductionmentioning

confidence: 99%

Diffusiophoresis of a polyelectrolyte in a salt concentration gradient

Liu

Hsu

et al. 2012

Electrophoresis

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The diffusiophoresis of a polyelectrolyte subject to an applied salt concentration gradient is modeled theoretically. The entirely porous type of particle is capable of simulating entities such as DNA, protein, and synthetic polymeric particles. The dependence of the diffusiophoretic behavior of the polyelectrolyte on its physical properties, and the types of ionic species and their bulk concentrations are discussed in detail. We show that in addition to the effects coming from the polarization of double layer and the difference in the ionic diffusivities, the polarization of the condensed counterions inside the polyelectrolyte might also be significant. The last effect, which has not been reported previously, reduces both the electric force and the hydrodynamic force acting on the polyelectrolyte. Both the direction and the magnitude of the diffusiophoretic velocity of the polyelectrolyte are found to highly depend upon its physical properties. These results provide valuable references for applications such as DNA sequencing and catalytic nano- or micromotors.

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Section: Introductionmentioning

confidence: 99%

Diffusiophoresis of a polyelectrolyte in a salt concentration gradient

Liu

Hsu

et al. 2012

Electrophoresis

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“…A motor moves through fluid, so by inverse, immobilizing it will induce fluid flow in the vicinity of the motor. The first examples of micropumps (51,53,60,62,63) were developed using the same principle as those used in the development of bimetallic Au-Pt motors (described above). When fuel is added to the system, electrochemical reactions take place at the surface of the two metals: The cathode reduces fuel and consumes protons, and the anode oxidizes fuel and produces protons (see Figure 2c).…”

Section: Self-electrophoresismentioning

confidence: 99%

Anatomy of Nanoscale Propulsion

Yadav¹,

Duan²,

Butler

et al. 2015

Annu. Rev. Biophys.

Self Cite

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Nature supports multifaceted forms of life. Despite the variety and complexity of these forms, motility remains the epicenter of life. The applicable laws of physics change upon going from macroscales to microscales and nanoscales, which are characterized by low Reynolds number (Re). We discuss motion at low Re in natural and synthetic systems, along with various propulsion mechanisms, including electrophoresis, electrolyte diffusiophoresis, and nonelectrolyte diffusiophoresis. We also describe the newly uncovered phenomena of motility in non-ATP-driven self-powered enzymes and the directional movement of these enzymes in response to substrate gradients. These enzymes can also be immobilized to function as fluid pumps in response to the presence of their substrates. Finally, we review emergent collective behavior arising from interacting motile species, and we discuss the possible biomedical applications of the synthetic nanobots and microbots.

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“…This migration is known as diffusiophoresis [1][2][3][4][5][6] and provides a mechanism in various practical applications such as particle characterization, transport, manipulation, separation, and deposition in microfluidic and other devices [7][8][9][10]; DNA translocation and sequencing [11][12][13]; pattern formation [14,15]; and autonomous motions of micro/nano-motors [16][17][18]. For a charged particle in an ionic fluid, the particle-ion interaction is in the range of the reciprocal of the Debye screening parameter .…”

Section: Introductionmentioning

confidence: 99%

Diffusiophoretic mobility of charge‐regulating porous particles

Keh

2016

Electrophoresis

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The diffusiophoresis of a charge-regulating porous sphere, such as polyelectrolyte coil, with an arbitrary thickness of the electric double layer in an electrolyte solution prescribed with a concentration gradient is analytically studied for the first time. The ionogenic functional groups and hydrodynamic frictional segments distribute uniformly within the permeable particle, and a charge regulation model for the association and dissociation reactions of the functional groups relates the fixed charge density to the local electric potential. The electrokinetic equations governing the electric potential, ionic electrochemical potential, and fluid velocity distributions are solved as power-series expansions in the basic fixed charge density. An explicit formula for the diffusiophoretic mobility of the particle, which vanishes at the isoelectric point, is derived from a force balance. The effects of charge regulation on the diffusiophoretic mobility, which depend on various particle and electrolyte characteristics such as the reaction equilibrium constants of the ionogenic functional groups, are significant and interesting. The variation in the bulk concentration of the charge-determining ions can produce more than one reversal in the direction of the diffusiophoretic velocity. The obtained results differ conspicuously from those of impermeable particles and provide valuable information for the interpretation of experimental data.

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Reversible Pattern Formation through Photolysis

Cited by 26 publications

References 29 publications

Diffusiophoresis of a polyelectrolyte in a salt concentration gradient

Diffusiophoresis of a polyelectrolyte in a salt concentration gradient

Anatomy of Nanoscale Propulsion

Diffusiophoretic mobility of charge‐regulating porous particles

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