Nanofluids

A new class of materials produced from nanoparticle assemblies

Ramesh Jagannathan, Glen C. Irvin

    Research output: Contribution to journalArticle

    Abstract

    We present evidence of a novel nanostructured fluid, a nanofluid, composed of molecular clusters of a polar organic dye and surfactant. These are not nanoparticles dispersed in a solvent; there are no solvent molecules present. These materials, which are solids under ambient conditions, are non-reactively precipitated from a compressed CO2 solution, resulting in a liquid-like material, which we call a nanofluid. The precipitated dye-surfactant clusters are 1-4 nm in size. This nanofluid exhibits intense luminescent signatures, which are significantly blue-shifted with respect to the dye powder or a solution of it. The X-ray diffraction pattern did not show any structure in the low-angle regime. The fluorinated surfactant is highly soluble in compressed CO2. The polar dye does not dissolve in compressed CO 2 but is solubilized by electrostatic interactions with the surfactant head groups. We believe that the ultrafast and controlled precipitation from compressed CO2 preserves the electrostatic coupling and promotes a structured molecular cluster. Additionally, we demonstrate the formation of organic nanoparticles using this controlled precipitation process from compressed CO2.

    Original languageEnglish (US)
    Pages (from-to)1501-1510
    Number of pages10
    JournalAdvanced Functional Materials
    Volume15
    Issue number9
    DOIs
    StatePublished - Sep 1 2005

    Fingerprint

    Surface-Active Agents
    assemblies
    Surface active agents
    Coloring Agents
    Dyes
    dyes
    surfactants
    Nanoparticles
    nanoparticles
    molecular clusters
    electrostatics
    Carbon Monoxide
    Coulomb interactions
    Powders
    Diffraction patterns
    Electrostatics
    diffraction patterns
    signatures
    X ray diffraction
    Molecules

    ASJC Scopus subject areas

    • Materials Science(all)
    • Electronic, Optical and Magnetic Materials
    • Physics and Astronomy (miscellaneous)
    • Condensed Matter Physics

    Cite this

    Nanofluids : A new class of materials produced from nanoparticle assemblies. / Jagannathan, Ramesh; Irvin, Glen C.

    In: Advanced Functional Materials, Vol. 15, No. 9, 01.09.2005, p. 1501-1510.

    Research output: Contribution to journalArticle

    Jagannathan, Ramesh ; Irvin, Glen C. / Nanofluids : A new class of materials produced from nanoparticle assemblies. In: Advanced Functional Materials. 2005 ; Vol. 15, No. 9. pp. 1501-1510.
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