Castable three-dimensional stationary phase for electric field-driven applications
View Patent ↗A polymer material useful as the porous dielectric medium for microfluidic devices generally and electrokinetic pumps in particular. The polymer material is produced from an inverse (water-in-oil) emulsion that creates a 3-dimensional network characterized by small pores and high internal volume, characteristics that are particularly desirable for the dielectric medium for electrokinetic pumps. Further, the material can be cast-to-shape inside a microchannel. The use of bifunctional monomers provides for charge density within the polymer structure sufficient to support electroosmotic flow. The 3-dimensional polymeric material can also be covalently bound to the channel walls thereby making it suitable for high-pressure applications.
1. A microfluidic device comprising an enclosed channel having a polymer disposed therein, wherein the polymer has the generic formula
wherein, A, is selected from styrene, methacrylonitrile, acrylates, vinyl pyridine, or methacrylates, B is selected from divinylbenzene, ethylene glycol dimethylacrylate, or trimethylolpropane trimethylacrylate and C is selected from trialkoxysilyl functionalized monomers, sulfonates, phosphonates, boronates, alkyl ammonium, or ammonium compounds containing active vinyl groups, trimethyloxysilylpropylmethacrylate, sodium vinyl sulfonate, vinyl phosphonic acid, or 4 vinyl phenylboronic acid, x, y, and z are greater than zero and can be equal or unequal and q is greater than zero and;
basic functionalities, wherein said basic functionalities include vinyl pyridine or vinyl imidazole.