Magnetohydrodynamic Microfluidic Drive of Ionic Liquids

Ionic liquids are increasingly attracting the attention of researchers in both academia and industry. However, research into ionic liquids is mainly limited in chemistry, and the electromagnetic characteristics and microfluidic/optofluidic applications of ionic liquids have been rarely studied. Here, ionic liquids are used as a new type of fluid material for microfluidics/optofluidics, and the research on magnetohydrodynamic (MHD) microfluidic drive of ionic liquids is conducted using hydrophilic [bmim]BF4 and hydrophobic [bmim]NTf2. The experimental study shows that ionic liquids can be driven by Lorentz force to induce laminar flow. The flow rates of [bmim]NTf2 are 2.7 and 7.8 μl/s at applied direct-current potentials of 6 and 8 V, respectively, in a 0.4-T magnetic field. The experimental results of the two ionic liquids and electrolytes are compared. Moreover, the experimental results are compared with the theoretical data calculated using a numerical simulation and Poiseuille's law, and the limitation of Poiseuille's law is pointed for the MHD drive. The conducted research can promote the application of ionic liquids in microfluidics or optofluidics.

[1]  C. Poole,et al.  Extraction of organic compounds with room temperature ionic liquids. , 2010, Journal of chromatography. A.

[2]  Bumkyoo Choi,et al.  A study on the MHD (magnetohydrodynamic) micropump with side-walled electrodes , 2009 .

[3]  Janko Auerswald,et al.  Micropump based on electroosmosis of the second kind , 2009, Electrophoresis.

[4]  Kikuko Hayamizu,et al.  Physicochemical Properties and Structures of Room Temperature Ionic Liquids. 1. Variation of Anionic Species , 2004 .

[5]  Gwan Soo Park,et al.  A study on the pumping forces of the magnetic fluid linear pump , 2003 .

[6]  M. Watanabe,et al.  Solvent Effect of Room Temperature Ionic Liquids on Electrochemical Reactions in Lithium–Sulfur Batteries , 2013 .

[7]  Y. Fouillet,et al.  Ionic liquid droplet as e-microreactor. , 2006, Analytical chemistry.

[8]  PARTICLE-TRACE VISUALIZATION TECHNIQUE , 2007 .

[9]  R. Zengerle,et al.  Microfluidic lab-on-a-chip platforms: requirements, characteristics and applications. , 2010, Chemical Society reviews.

[10]  Michael Freemantle,et al.  An Introduction to Ionic Liquids , 2010 .

[11]  Bruno Scrosati,et al.  Ionic-liquid materials for the electrochemical challenges of the future. , 2009, Nature materials.

[12]  Jan C.T. Eijkel,et al.  A circular ac magnetohydrodynamic micropump for chromatographic applications , 2003 .

[13]  S. Koda,et al.  A theoretical study on the frequency-dependent electric conductivity of electrolyte solutions. , 2007, The Journal of chemical physics.

[14]  J. Mazurkiewicz.  Studies of inherently conducting polymers in ionic liquids , 2007 .

[15]  Jandir M. Hickmann,et al.  Nonlocal optical nonlinearity of ionic liquids , 2008 .

[16]  S. Koda,et al.  A theoretical study on the frequency-dependent electric conductivity of electrolyte solutions. II. Effect of hydrodynamic interaction. , 2009, The Journal of chemical physics.

[17]  S. Handy.  Ionic Liquids - Classes and Properties , 2011 .

[18]  Jiasong He,et al.  Room temperature ionic liquids (RTILs): A new and versatile platform for cellulose processing and derivatization , 2009 .

[19]  Andrew P Abbott,et al.  Model for the conductivity of ionic liquids based on an infinite dilution of holes. , 2005, Chemphyschem : a European journal of chemical physics and physical chemistry.

[20]  S. Saha,et al.  A new class of magnetic fluids: bmim[FeCl/sub 4/] and nbmim[FeCl/sub 4/] ionic liquids , 2006, IEEE Transactions on Magnetics.

[21]  Jens Anders Branebjerg,et al.  Microfluidics-a review , 1993 .

[22]  G. Voth,et al.  Understanding ionic liquids through atomistic and coarse-grained molecular dynamics simulations. , 2007, Accounts of chemical research.

[23]  Hiroyuki Ohno,et al.  Control of ionic conductivity of ionic liquid/photoresponsive poly(amide acid) gels by photoirradiation. , 2007, Chemical communications.

[24]  G. Voth,et al.  Tail aggregation and domain diffusion in ionic liquids. , 2006, The journal of physical chemistry. B.

[25]  Jaesung Jang,et al.  Theoretical and experimental study of MHD (magnetohydrodynamic) micropump , 2000 .

[26]  A. Hagfeldt,et al.  Photoelectrochemical studies of ionic liquid-containing solar cells sensitized with different polypyridyl–ruthenium complexes , 2009 .