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Your search keyword '"Reken N. Patel"' showing total 3 results
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3 results on '"Reken N. Patel"'

1. Langmuir–Blodgett Transfer of Nanocrystal Monolayers: Layer Compaction, Layer Compression, and Lattice Stretching of the Transferred Layer

Author

Reken N. Patel, Brian Goodfellow, Andrew T. Heitsch, Detlef-M. Smilgies, and Brian A. Korgel

Subjects
nanocrystals, self-assembly, monolayers, Langmuir–Blodgett transfer, GISAXS, Chemistry, QD1-999
Abstract

Grazing incidence small angle X-ray scattering (GISAXS) was used to study the structure and interparticle spacing of monolayers of organic ligand-stabilized iron oxide nanocrystals floating at the air–water interface on a Langmuir trough, and after transfer to a solid support via the Langmuir–Blodgett technique. GISAXS measurements of the nanocrystal arrangement at the air–water interface showed that lateral compression decreased the interparticle spacing of continuous films. GISAXS also revealed that Langmuir–Blodgett transfer of the nanocrystal layers to a silicon substrate led to a stretching of the film, with a significant increase in interparticle spacing.

Published
2024
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2. Multifunctional Particles: Magnetic Nanocrystals and Gold Nanorods Coated with Fluorescent Dye-Doped Silica Shells

Author

Andrew T. Heitsch, David Ress, Brian A. Korgel, Danielle K. Smith, and Reken N. Patel

Subjects
Materials science, Nanostructure, Dispersity, Nanoparticle, Nanotechnology, Condensed Matter Physics, equipment and supplies, Fluorescence, Article, Electronic, Optical and Magnetic Materials, Inorganic Chemistry, Chemical engineering, Nanocrystal, Materials Chemistry, Ceramics and Composites, Magnetic nanoparticles, Nanorod, Microemulsion, Physical and Theoretical Chemistry, human activities
Abstract

Multifunctional colloidal core-shell nanoparticles of magnetic nanocrystals (of iron oxide or FePt) or gold nanorods encapsulated in silica shells doped with the fluorescent dye, Tris(2,2'-bipyridyl)dichlororuthenium(II) hexahydrate (Rubpy) were synthesized. The as-prepared magnetic nanocrystals are initially hydrophobic and were coated with silica using a microemulsion approach, while the as-prepared gold nanorods are hydrophilic and were coated with silica using a Stober-type of process. Each approach yielded monodisperse nanoparticles with uniform fluorescent dye-doped silica shells. These colloidal heterostructures have the potential to be used as dual-purpose tags-exhibiting a fluorescent signal that could be combined with either dark-field optical contrast (in the case of the gold nanorods), or enhanced contrast in magnetic resonance images (in the case of magnetic nanocrystal cores). The optical and magnetic properties of the fluorescent silica-coated gold nanorods and magnetic nanocrystals are reported.

Published
2008

3. Wurtzite−Chalcopyrite Polytypism in CuInS2Nanodisks.

Author

Bonil Koo, Reken N. Patel, and Brian A. Korgel

Subjects
*NANOSTRUCTURED materials, *COPPER sulfide, *WURTZITE, *CHALCOPYRITE, *CHLORIDES, *X-ray diffraction, *TRANSMISSION electron microscopy
Abstract

Monodisperse CuInS2nanodisks were synthesized by heating metal chlorides and thiourea in oleylamine. X-ray diffraction showed the predominant phase to be wurtzite (hexagonal) CuInS2instead of chalcopyrite (tetragonal) or compositionally disordered sphalerite (cubic). High-resolution transmission electron microscopy, however, revealed polytypism in the nanodisks, with the wurtzite phase interfaced with significant chalcopyrite domains. [ABSTRACT FROM AUTHOR]

Published
2009
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