Electrical Insulation Of Carbon Nanotube Separation Columns For Microchip Electrochromatography

Klaus Bo Mogensen, Miaoxiang Max Chen, Kristian Mølhave, Peter Bøggild, Jörg Peter Kutter

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

    Abstract

    Carbon nanotubes (CNT) have been grown in microfluidic glass channels for chemical analysis based on electrokinetic separations. A limitation of CNTs for this type of application is their high conductivity, which prevent them from being used for electroosmotic pumping with electrical field strengths in the range of 0.5-1.0 kV/cm. This range of field strength is desirable for most electrokinetic separation systems in order not to have excess band broadening from diffusion due a too low mobile phase velocity. Here, we have approached this limitation by patterning the CNTs into micrometer sized regions in order to significantly lower the conductivity of the carbon nanotube layer. By this approach, the electrical field strength that can be sustained by the column is increased from around 100 V/cm to more than 2 kV/cm. This is more than one order of magnitude higher than previous reports [1-3].
    Original languageEnglish
    Title of host publicationSolid-State Sensors, Actuators and Microsystems Conference (Transducers)
    Publication date2011
    ISBN (Print)9781457701573
    Publication statusPublished - 2011
    Event16th International Solid-State Sensors, Actuators and Microsystems Conference - Beijing, China
    Duration: 5 Jun 20119 Jun 2011
    Conference number: 16
    http://www.transducers11-beijing.org/

    Conference

    Conference16th International Solid-State Sensors, Actuators and Microsystems Conference
    Number16
    CountryChina
    CityBeijing
    Period05/06/201109/06/2011
    Internet address

    Keywords

    • Electrosmotic flow
    • Carbon nanotubes
    • Microfluidics
    • Chromatography

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