In situ observation of UF5 nanoparticle growth in a low-pressure mixed-flow reactor |
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| Authors: | Y Kuga M Hirasawa T Seto K Okuyama K Takeuchi |
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| Institution: | (1) The Institute of Physical and Chemical Research (RIKEN), 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan (Fax: +81-48/462-4702 , E-mail: hirasawa@postman.riken.go.jp; takeuchi@postman.riken.go.jp), JP;(2) Department of Applied Chemistry, Muroran Institute of Technology, 27-1 Mizumoto-cho, Muroran 050-8585, Japan (Fax: +81-143/46-5765, E-mail: kuga@muroran-it.ac.jp), JP;(3) Department of Energy Engineering, Mechanical Engineering Laboratory, 1-2 Namiki, Tsukuba-shi, Ibaraki 305-0044, Japan (Fax: +81-298/58-7275, E-mail: seto@mel.go.jp), JP;(4) Department of Chemical Engineering, Hiroshima University, Kagamiyama, Higashi-Hiroshima-shi, Hiroshima 739-0046, Japan (Fax: +81-0824/22-7191, E-mail: okuyama@ue.ipc.hiroshima-u.ac.jp), JP |
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| Abstract: | 5 nanoparticles equipped with an in situ size-monitoring system, a LPDMA (low-pressure differential mobility analyzer), was
developed to experimentally investigate the nanoparticle growth mechanism. The concentration of photoproduced UF5 molecules was controlled by changing three factors: (I) the concentration of the feed UF6 gas, (II) the laser pulse energy of the irradiation, and (III) the repetition rate of the laser pulses. The dependence of
the volumetric average diameter of the photoproduced particles on the UF5 nascent concentration in all three cases was found to be very similar. The result strongly suggests that the reactor functions
as a mixed-flow reactor under a complete mixing condition. The particle size measured by the LPDMA was found to be in the
range of 6 to 11 nm, and it was approximately proportional to the power 0.3 of the initial concentration of photoproduced
UF5 molecules.
Received: 11 May 1998/Accepted: 15 September 1998 |
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| Keywords: | PACS: 82 50 Fv |
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