Ultrafast measurement of transient electroosmotic flow in microfluidics

Kuang, Cuifang; Qiao, Rui; Wang, Guiren

doi:10.1007/s10404-011-0800-y

Cited by 20 publications

(12 citation statements)

References 41 publications

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“…These values of t ss suggest that the transient electroosmotic flow analyzed in the present study could be observed in an experimental work, provided that the magnitude of the time t = ρH 2t /η 0 is greater than the possible values that have been experimentally measured. In this sense, the best temporal resolution (TR) has reported by using micro-PIV (micro-particle image velocimetry) [43,44] and LIFPA (laser-induced fluorescence photobleaching anemometer) [45,46] techniques. With the use of these experimental techniques, the correspon -1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 ding times are 0.5 ms and 0.005-0.1 ms, respectively.…”

Section: Resultsmentioning

confidence: 99%

Transient electroosmotic flow of Maxwell fluids in a slit microchannel with asymmetric zeta potentials

Escandón

Jimenez

Hernández

et al. 2015

European Journal of Mechanics - B/Fluids

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Section: Resultsmentioning

confidence: 99%

Transient electroosmotic flow of Maxwell fluids in a slit microchannel with asymmetric zeta potentials

Escandón

Jimenez

Hernández

et al. 2015

European Journal of Mechanics - B/Fluids

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“…The transient electroosmotic has recently been studied in electrokinetically driven flows [14][15][16][17][18][19][20][21][22]. Marcos et al [14] investigated a frequency-dependent laminar EOF in a closed-end rectangular microchannel.…”

Section: Introductionmentioning

confidence: 99%

Characterization of the startup transient electrokinetic flow in rectangular channels of arbitrary dimensions, zeta potential distribution, and time‐varying pressure gradient

2015

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The solution to the startup transient EOF in an arbitrary rectangular microchannel is derived analytically and validated experimentally. This full 2D transient solution describes the evolution of the flow through five distinct periods until reaching a final steady state. The derived analytical velocity solution is validated experimentally for different channel sizes and aspect ratios under time-varying pressure gradients. The experiments used a time resolved micro particle image velocimetry technique to calculate the startup transient velocity profiles. The measurements captured the effect of time-varying pressure gradient fields derived in the analytical solutions. This is tested by using small reservoirs at both ends of the channel which allowed a time-varying pressure gradient to develop with a time scale on the order of the transient EOF. Results showed that under these common conditions, the effect of the pressure build up in the reservoirs on the temporal development of the transient startup EOF in the channels cannot be neglected. The measurements also captured the analytical predictions for channel walls made of different materials (i.e., zeta potentials). This was tested in channels that had three PDMS and one quartz wall, resulting in a flow with an asymmetric velocity profile due to variations in the zeta potential between the walls.

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“…The fundamental fluid mechanics aspects in terms of the effects of inertial forces, pressure forces, and nonuniform wall charge on EOF were discussed [21]. Experimentally, measurements of EOF have been carried out by using several techniques for steady [22][23][24][25][26][27][28][29][30][31] and transient conditions [32][33][34][35][36]. It should be pointed that these theoretical and experimental works only deal with EOF under isothermal conditions.…”

Section: Introductionmentioning

confidence: 99%

Thermal Effect on Microchannel Electro-osmotic Flow With Consideration of Thermodiffusion

Zhou

Xie

Yang

et al. 2015

Journal of Heat Transfer

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Electro-osmotic flow (EOF) is widely used in microfluidic systems. Here, we report an analysis of the thermal effect on EOF under an imposed temperature difference. Our model not only considers the temperature-dependent thermophysical and electrical properties but also includes ion thermodiffusion. The inclusion of ion thermodiffusion affects ionic distribution, local electrical potential, as well as free charge density, and thus has effect on EOF. In particular, we formulate an analytical model for the thermal effect on a steady, fully developed EOF in slit microchannel. Using the regular perturbation method, we solve the model analytically to allow for decoupling several physical mechanisms contributing to the thermal effect on EOF. The parametric studies show that the presence of imposed temperature difference/gradient causes a deviation of the ionic concentration, electrical potential, and electro-osmotic velocity profiles from their isothermal counterparts, thereby giving rise to faster EOF. It is the thermodiffusion induced free charge density that plays a key role in the thermodiffusion induced electro-osmotic velocity.

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Ultrafast measurement of transient electroosmotic flow in microfluidics

Cited by 20 publications

References 41 publications

Transient electroosmotic flow of Maxwell fluids in a slit microchannel with asymmetric zeta potentials

Transient electroosmotic flow of Maxwell fluids in a slit microchannel with asymmetric zeta potentials

Characterization of the startup transient electrokinetic flow in rectangular channels of arbitrary dimensions, zeta potential distribution, and time‐varying pressure gradient

Thermal Effect on Microchannel Electro-osmotic Flow With Consideration of Thermodiffusion

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