High-Temperature Microfluidic Synthesis of CdSe Nanocrystals in Nanoliter Droplets.
The high-temperature synthesis of CdSe nanocrystals in nanoliter-volume droplets flowing in a perfluorinated carrier fluid through a microfabricated reactor is presented. A flow-focusing nanojet structure with a step increase in channel height reproducibly generated octadecene droplets in Fomblin Y...
| Published in: | Journal of the American Chemical Society Vol. 127; no. 40; pp. 13854 - 13862 |
|---|---|
| Main Authors: | , , |
| Format: | Article |
| Published: |
American Chemical Society
10/12/2005
|
| Subjects: | |
| Online Access: | View this record in EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=hlh&AN=18877439&site=ehost-live header: @attributes: shortDbName: hlh uiTerm: 18877439 longDbName: Humanities International Complete uiTag: AN controlInfo: bkinfo: jinfo: jid: 00027863 ACS jtl: Journal of the American Chemical Society issn: 00027863 maglogo: N pubinfo: dt: 10/12/2005 vid: 127 iid: 40 pid: 997 pub: American Chemical Society artinfo: ui: 18877439 10.1021/ja051381p ppf: 13854 ppct: 8 formats: tig: atl: High-Temperature Microfluidic Synthesis of CdSe Nanocrystals in Nanoliter Droplets. aug: au: Chan, Emory M. Alivisatos, A. Paul Mathies, Richard A. affil: Department of Chemistry, University of California, Berkeley, Berkeley, California 94720. Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720. su: Nanocrystals Hydrodynamics Properties of matter Electron microscopy Spectrum analysis Native element minerals sug: subj: Nanocrystals Hydrodynamics Properties of matter Electron microscopy Spectrum analysis Native element minerals ab: The high-temperature synthesis of CdSe nanocrystals in nanoliter-volume droplets flowing in a perfluorinated carrier fluid through a microfabricated reactor is presented. A flow-focusing nanojet structure with a step increase in channel height reproducibly generated octadecene droplets in Fomblin Y 06/6 perfluorinated polyether at capillary numbers up to 0.81 and with a droplet:carrier fluid viscosity ratio of 0.035. Cadmium and selenium precursors flowing in octadecene droplets through a high-temperature (240- 300 °C) glass microreactor produced high-quality CdSe nanocrystals, as verified by optical spectroscopy and transmission electron microscopy. Isolating the reaction solution in droplets prevented particle deposition and hydrodynamic dispersion, allowing the reproducible synthesis of nanocrystals at three different temperatures and four different residence times in the span of 4 h. Our synthesis of a wide range of nanocrystals at high temperatures, high capillary numbers, and low viscosity ratio illustrates the general utility of droplet-based microfluidic reactors to encapsulate nanoliter volumes of organic or aqueous solutions and to precisely control chemical or biochemical reactions. pubtype: Academic Journal doctype: Article src: R language: English refInfo: copyright: @attributes: flag: Y dt: @attributes: year: 2005 holdings: @attributes: islocal: N |
|---|