4.8 Article

High- Rate Continuous Synthesis of Nanocrystalline Perovskites and Metal Oxides in a Colliding Vapor Stream of Microdroplets

Journal

ADVANCED FUNCTIONAL MATERIALS
Volume 24, Issue 9, Pages 1275-1282

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201301916

Keywords

nanomanufacturing; inorganic nanomaterials; continuous flow; reactor engineering; titanium oxide; perovskites; nanocrystals

Funding

  1. US Army Research Office [W911NF-09-D-0001]
  2. UCSB's Center for Energy Efficient Materials, a DOE [DE-SC0001009]
  3. US Dept. of Energy [DEFG03-02ER46006]
  4. NSF's MRSEC Program [DMR05-20414]

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A high-rate, continuous synthesis of functional nanomaterials using a home engineered reactor is reported. The reactor is able to produce low-cost, kilogram-scale BaTiO3 nanopowders with a nanocrystalline particle size less than 30 nm at mild temperatures (<100 degrees C) and ambient pressure. Nebulization and collision of warm microdroplets (60-80 degrees C) of Ba(OH)(2) and Ti(O-nBu)(4) very quickly result in total hydrolysis and subsequent conversion to BaTiO3, yielding 1.3 kg/day of high purity, highly crystalline nanoparticles (25-30 nm). This synthesis procedure also enables high-rate production of TiO2 anatase (2.9 kg/day). It therefore provides a general platform for processing and scaling up of functional inorganic nanomaterials under very mild conditions.

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