Abstract
Light is used to dynamically control the pattern of electroosmotic flow in a microfluidic channel. One wall of the channel is formed by a photoconductor film in a specific geometry. Illumination of this surface results in an increase of the conductivity that modifies the structure of the electric field inside the channel. A dramatic change of the electroosmotic flow pattern can be achieved. This approach provides useful capabilities for the manipulation of fluids in microfluidic systems like directing flow and mixing.
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References
Adrian RJ (1991) Particle-imaging techniques for experimental fluid mechanics. Ann Rev Fluid Mech 23:261–304
Chiou PY, Moon H, Toshiyoshi H, Kim CJ, Wu MC (2003) Light actuation of liquid by optoelectrowetting. Sens Actuators A 104:222–228
Chiou PY, Ohta AT, Wu MC (2005) Massively parallel manipulation of single cells and microparticles using optical images. Nature 436:370–372
Duffy DC, McDonald JC, Schueller OJA, Whitesides GM (1998) Rapid prototyping of microfluidic systems in poly(dimethylsiloxane). Anal Chem 70:4974–4984
Hayward RC, Saville DA, Aksay IA (2000) Electrophoretic assembly of colloidal crystals with optically tunable micropatterns. Nature 404:56–59
Herr AE, Molho JI, Santiago JG, Mungal MG, Kenny TW, Garguilo MG (2000) Electroosmotic capillary flow with nonuniform zeta potential. Anal Chem 72:1053–1057
Horiuchi K, Dutta P (2006) Electrokinetic flow control in microfluidic chip using field-effect transistor. Lab-on-a-Chip 6:714–723
Johnson TJ, Ross D, Locascio LE (2002) Rapid microfluidic mixing. Anal Chem 74:45–51
Kirby BJ, Hasselbrink EF (2004) Zeta-potential of microfluidic substrates: 2. Data for polymers. Electrophoresis 25:203–213
Lee CY, Lee GB, Fu LM, Lee KH, Yang RJ (2004) Electrokinetically driven active micro-mixers utilizing zeta potential variation induced by field effect. J Micromech Microeng 14:1390–1398
Moorthy J, Khoury C, Moore JS, Beebe DJ (2001) Active control of electroosmotic flow in microchannels using light. Sens Actuators B 75:223–229
Oroszi L, Der A, Kirei H, Rakovics V, Ormos P (2006) Control of electroosmostic flow by light. Appl Phys Lett 89:263508
Psaltis D, Quake SR, Yang C (2006) Developing optofluidic technology through the fusion of microfluidics and optics. Nature 442:381–386
Rakovics V (2006) Chemical bath deposition of CdS and CdPbS nanocrystalline thin films and investigation of their photoconductivity. Soc Symp Proc 900E:O03-30.1
Roy S, Kar S, Chaudhuri S, Dasgupta A (2006) Potential of cadmium sulphide nanorods as an optical microscopic probe to the folding state of cytochrome C. Biophys Chem 124:52–61
Stroock AD, Dertinger SKW, Ajdari A, Mezic I, Stone HA, Whitesides GM (2002) Chaotic mixer for microchannels. Science 295:647–654
Stroock AD, Weck M, Chiu DT, Huck WTS, Kenis PJA, Ismagilov RF, Whitesides GM (2000) Patterning electro-osmotic flow with patterned surface charge. Phys Rev Lett 84:3314–3317
Sze A, Erickson D, Ren L, Li D (2003) Zeta-potential measurement using the Smoluchowski equation and the slope of the current-time relationship in electroosmotic flow. J Colloid Interface Sci 261:402–410
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This work was supported by grant Országos Tudományos Kutatási Alap NK72375.
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Oroszi, L., Dér, A., Kirei, H. et al. Manipulation of microfluidic flow pattern by optically controlled electroosmosis. Microfluid Nanofluid 6, 565–569 (2009). https://doi.org/10.1007/s10404-008-0346-9
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DOI: https://doi.org/10.1007/s10404-008-0346-9