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

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