High-Temperature Microfluidic Synthesis of CdSe Nanocrystals inNanoliter Droplets

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The high-temperature synthesis of CdSe nanocrystals innanoliter-volume droplets flowing in a perfluorinated carrier fluidthrough a microfabricated reactor is presented. A flow-focusing nanojetstructure with a step increase in channel height reproducibly generatedoctadecene droplets in Fomblin Y 06/6 perfluorinated polyether atcapillary numbers up to 0.81 and with a droplet:carrier fluid viscosityratio of 0.035. Cadmium and selenium precursors flowing in octadecenedroplets through a high-temperature (240-300 degrees C) glassmicroreactor produced high quality CdSe nanocrystals, as verified byoptical spectroscopy and transmission electron microscopy. Isolating thereaction solution in droplets prevented particle deposition andhydrodynamic dispersion, allowing the reproducible synthesis ofnanocrystals at three different temperatures and four different ... continued below

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Chan, Emory M.; Alivisatos, A. Paul & Mathies, Richard A. June 9, 2005.

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This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 16 times , with 5 in the last month . More information about this article can be viewed below.

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The high-temperature synthesis of CdSe nanocrystals innanoliter-volume droplets flowing in a perfluorinated carrier fluidthrough a microfabricated reactor is presented. A flow-focusing nanojetstructure with a step increase in channel height reproducibly generatedoctadecene droplets in Fomblin Y 06/6 perfluorinated polyether atcapillary numbers up to 0.81 and with a droplet:carrier fluid viscosityratio of 0.035. Cadmium and selenium precursors flowing in octadecenedroplets through a high-temperature (240-300 degrees C) glassmicroreactor produced high quality CdSe nanocrystals, as verified byoptical spectroscopy and transmission electron microscopy. Isolating thereaction solution in droplets prevented particle deposition andhydrodynamic dispersion, allowing the reproducible synthesis ofnanocrystals at three different temperatures and four different residencetimes in the span of four hours. Our synthesis of a wide range ofnanocrystals at high temperatures, high capillary numbers, and lowviscosity ratio illustrates the general utility of droplet-basedmicrofluidic reactors to encapsulate nanoliter volumes of organic oraqueous solutions and to precisely control chemical or biochemicalreactions.

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  • Journal Name: Journal of the American Chemical Society; Journal Volume: 127; Journal Issue: 40; Related Information: Journal Publication Date: 2005

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  • Report No.: LBNL--58076
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.1021/ja051381p | External Link
  • Office of Scientific & Technical Information Report Number: 908488
  • Archival Resource Key: ark:/67531/metadc881056

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  • June 9, 2005

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  • Sept. 22, 2016, 2:13 a.m.

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  • Sept. 29, 2016, 8:36 p.m.

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Chan, Emory M.; Alivisatos, A. Paul & Mathies, Richard A. High-Temperature Microfluidic Synthesis of CdSe Nanocrystals inNanoliter Droplets, article, June 9, 2005; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc881056/: accessed September 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.