Transcription of Microfluidics: Electrokinetics and Fabrication
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Microfluidics: Electrokinetics and Fabrication
1EE C245 Microfluidics: Electrokinetics and FabricationDr. Thara SrinivasanLecture 182U. Srinivasan EE C245 Lecture Outline: Part I Reading From S. Senturia,Microsystem Design, Chapter 13, Fluids, Today s lecture, Part I Electrolytes and Electrokinetic Effects Electroosmosis Electrophoresis23U. Srinivasan EE C245 Electrolytes Electrolytes, solutions of ionic species, have unique flow possibilities because electric fields can be used to direct the flow. Total charge density of solution and charge density far from bounding surfaces Charge density near a wall()02= = andCqziieie e = 2 = iTBkoeqiziieeCzq)(02 )(y =y4U. Srinivasan EE C245 Ionic Double Layers Electrolyte in contact with insulating solid surface Inner and outer Helmholtz layers are compact layers of adsorbed ions Diffuse layer of ions has compensating net charge+----------+++++++++---++++--+Bulk solution (+ = -)Diffuse layer (+ > -)Compact layer (+ < -)potentialzetaewDLyw, == 35U.
Fabrication Techniques for Microfluidics • Replication vs. Direct Techniques • Polymer Replication Techniques • Master Fabrication • Electroplating • Back-End Processes 38
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