Print Email Facebook Twitter Design and Prototyping of an Electro-Osmotic Pump with electro less deposited Silver/Silver-chloride Electrodes Title Design and Prototyping of an Electro-Osmotic Pump with electro less deposited Silver/Silver-chloride Electrodes Author Van der Ploeg, P.A. Contributor Heuck, F.C.A. (mentor) Faculty Mechanical, Maritime and Materials Engineering Department Precision and Microsystems Engineering Date 2010-05-25 Abstract In this work an electro-osmotic micro pump is developed. The scientific novelty of this work is the fabrication of the electrodes, which are constructed inside micro fluidic channels by means of electro less silver deposition. The fabrication process of the electrodes is based on pumping Tollens solution through micro fluidic channels. While the solution reacts, silver is formed which adheres to the sidewall of the channel. The top fraction of the silver in the channel is then transformed further into silverchloride. This way silver/silverchloride electrodes were formed that can transfer current based on a redox reaction. The benefit of this production process is that electrodes can be fabricated in a closed micro fluidic chip, such as the SFM-micropipette as is developed in our group. The theory behind electro-osmotic and electrophoretic phenomena is explained in the first part of this work, followed by the principles and relations that are important for electro-osmotic pump design. From this knowledge an electro-osmotic pump was designed in which the electrodes could be formed in the described manner. The properties of the pump were calculated and a prototype was fabricated. The fabricated prototype was evaluated in an experiment. Fluorescently labeled beads were inserted in the pumping channel and the movement of the beads was analyzed under the microscope. The experimental results show that a direct relation between the movement of the beads and the applied potential. Movement of the beads was observed under the threshold potential for hydrolysis, indicating that the current transfer takes place by a redox reaction. For all the potentials applied the velocity of the beads was circa 75% of what was expected. Also the current was lower, circa 40% of what was expected. Subject Electro OsmosePump To reference this document use: http://resolver.tudelft.nl/uuid:8468ef8a-8c9f-4d89-ac6c-0fe2a8a7628a Embargo date 2010-07-14 Part of collection Student theses Document type master thesis Rights (c) 2010 Van der Ploeg, P.A. Files PDF PT_10_018_-_Ploeg-vd_-_MS ... Report.pdf 8.36 MB PDF PT_10_018_-_Ploeg-vd_-_MS ... tation.pdf 3.42 MB Close viewer /islandora/object/uuid:8468ef8a-8c9f-4d89-ac6c-0fe2a8a7628a/datastream/OBJ2/view