I&EC 56 |
| A novel process will be described that utilizes the pressure tunable physico-chemical properties of CO2 gas expanded liquid solutions to size selectively precipitate and fractionate polydisperse metal and semiconductor nanoparticle dispersions into multiple narrow size populations. Our work demonstrates that ligand stabilized nanoparticles can be size selectively precipitated by simply controlling the addition of compressed CO2 antisolvent to an organic nanoparticle dispersion. This tunable gas expanded liquid approach allows for rapid and efficient size separation while also reducing organic solvent usage. The efficacy of this process has been demonstrated with several types of metal and semiconductor particles at process scales ranging from microliters to >100 milliliters of an organic nanoparticle dispersion. In addition, this gas expanded liquid driven nanoparticle deposition process has been utilized to create ordered thin films and arrays of nanoparticles on device surfaces, such as MEMS devices, without the detrimental interfacial dewetting effects inherent to liquid evaporation driven nanoparticle deposition techniques. |
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Industrial and Engineering Chemistry Divisional Fellow Award Symposium - Dr. Ruben Carbonell
8:30 AM-11:25 AM, Tuesday, April 8, 2008 Morial Convention Center -- Rm. 231, Oral
Division of Industrial & Engineering Chemistry |