Virtual electrowetting channels: electronic liquid transport with continuous channel functionality.

Reported is a new mechanism for electronic transport of liquid in virtual channels. These virtual channels are formed by application of voltage to an array of polymer posts. The posts are coated with a conducting electrode and hydrophobic dielectric, and thereby capable of electrowetting. Directional channel formation, as well as splitting and merging, is also demonstrated using specific arrangements of posts. The channel dimensions are approximately 20 microm in cross-section, are scalable, and at the threshold for channel formation the minimum transport speed is approximately 1 mm s(-1). The virtual electrowetting channels are further unique as they can retain any channel geometry even in the absence of voltage. With the addition of arrayed voltage controls, the virtual electrowetting channels have the potential to combine the advantages of programmable electrowetting and continuous channel functionality into a single lab-on-chip platform.

[1]  Richard B. Fair,et al.  Digital microfluidics: is a true lab-on-a-chip possible? , 2007 .

[2]  Thomas B. Jones,et al.  An electromechanical interpretation of electrowetting , 2005 .

[3]  T. Jones,et al.  Dielectrophoretic liquid actuation and nanodroplet formation , 2001 .

[4]  J. Baret,et al.  Electrowetting: from basics to applications , 2005 .

[5]  C. Kim,et al.  Electrowetting and electrowetting-on-dielectric for microscale liquid handling , 2002 .

[6]  Manjeet Dhindsa,et al.  Ion and liquid dependent dielectric failure in electrowetting systems. , 2009, Langmuir : the ACS journal of surfaces and colloids.

[7]  R. Fair,et al.  A scaling model for electrowetting-on-dielectric microfluidic actuators , 2009 .

[8]  D. Beebe,et al.  Surface-directed liquid flow inside microchannels. , 2001, Science.

[9]  L. Yeo,et al.  Electrowetting films on parallel line electrodes. , 2006, Physical review. E, Statistical, nonlinear, and soft matter physics.

[10]  A. Manz,et al.  Lab-on-a-chip: microfluidics in drug discovery , 2006, Nature Reviews Drug Discovery.

[11]  Stephan Herminghaus,et al.  Electroactuation of fluid using topographical wetting transitions. , 2005, Langmuir : the ACS journal of surfaces and colloids.

[12]  Wataru Satoh,et al.  On-chip microfluidic transport and mixing using electrowetting and incorporation of sensing functions. , 2005, Analytical chemistry.

[13]  R. Rosenfeld.  Nature , 2009, Otolaryngology--head and neck surgery : official journal of American Academy of Otolaryngology-Head and Neck Surgery.

[14]  R. J. Schwartz,et al.  Electrofluidic displays using Young-Laplace transposition of brilliant pigment dispersions , 2009 .

[15]  Stephen J. Dodd,et al.  A Deterministic Model for the Growth of Non-conducting Electrical Tree Structures , 2003 .

[16]  Ming C. Wu,et al.  Massively parallel manipulation of single cells and microparticles using optical images , 2005, Nature.

[17]  M. Olson,et al.  Electrophoretic separations of large DNA molecules by periodic inversion of the electric field. , 1986, Science.

[18]  J. Heikenfeld,et al.  Active-Matrix Microelectrode Arrays Integrated With Vertically Aligned Carbon Nanofibers , 2009, IEEE Electron Device Letters.

[19]  Mwj Menno Prins,et al.  Fluid control in multichannel structures by electrocapillary pressure. , 2001, Science.

[20]  Bruno Berge,et al.  Two liquids wetting and low hysteresis electrowetting on dielectric applications. , 2009, Langmuir : the ACS journal of surfaces and colloids.

[21]  Michael W L Watson,et al.  Hybrid microfluidics: a digital-to-channel interface for in-line sample processing and chemical separations. , 2009, Lab on a chip.

[22]  C. Kim,et al.  Frequency-Based Relationship of Electrowetting and Dielectrophoretic Liquid Microactuation , 2003 .

[23]  G. Whitesides.  The origins and the future of microfluidics , 2006, Nature.