1998
DOI: 10.1088/0022-3727/31/18/021
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Ac electrokinetics: a review of forces in microelectrode structures

Abstract: Ac electrokinetics is concerned with the study of the movement and behaviour of particles in suspension when they are subjected to ac electrical fields. The development of new microfabricated electrode structures has meant that particles down to the size of macromolecules have been manipulated, but on this scale forces other than electrokinetic affect particles behaviour. The high electrical fields, which are required to produce sufficient force to move a particle, result in heat dissipation in the medium. Thi… Show more

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Cited by 1,120 publications
(1,243 citation statements)
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“…Similar to those previously studied in eDEP [34][35][36][37][38][39][40][41][42][43][44][45][46][47], electrothermal flows in iDEP devices also arise from the action of the electric field (both DC and AC) on fluid inhomogeneities (predominantly electrical properties including conductivity and permittivity) formed in the constriction region due to Joule heating-induced temperature gradients. Figure 4 shows the numerically predicted temperature and electric field contours in the constriction region at 100 V DC/500 V AC.…”
Section: Resultssupporting
confidence: 63%
See 1 more Smart Citation
“…Similar to those previously studied in eDEP [34][35][36][37][38][39][40][41][42][43][44][45][46][47], electrothermal flows in iDEP devices also arise from the action of the electric field (both DC and AC) on fluid inhomogeneities (predominantly electrical properties including conductivity and permittivity) formed in the constriction region due to Joule heating-induced temperature gradients. Figure 4 shows the numerically predicted temperature and electric field contours in the constriction region at 100 V DC/500 V AC.…”
Section: Resultssupporting
confidence: 63%
“…It has been long known in capillary electrophoresis that Joule heating can elevate the buffer temperature and disturb the electroosmotic flow causing significant sample dispersion [30][31][32][33]. The effects of Joule heating on fluid temperature and motion in eDEP have been investigated previously [34][35][36][37][38]. It was reported that a pair of counter-rotating fluid circulations could form near the microelectrodes [39].…”
Section: Introductionmentioning
confidence: 99%
“…(2) and (4)-(7). The fitting data are summarised in Table 2. the measurements are also compounded by electrohydrodynamic effects [34,35]. Fig.…”
Section: Resultsmentioning
confidence: 99%
“…Therefore, measurement of the cross-over frequency is not complicated by movement of the particle relative to the fluid; however, fluid movement can occur due to electrohydrodynamic effects such as AC electroosmosis [34,35]. At low frequencies, the DEP behaviour of submicrometre particles is dominated by the conductivity component (σ p ) of the polarisability.…”
Section: Ac Electrokinetics and Dielectrophoresismentioning
confidence: 99%
“…For a pair of aligned finger electrodes, according to the approximate analysis in [28], the time-average electrothermal force per unit volume on a liquid is…”
Section: Dep Theorymentioning
confidence: 99%