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■ 외부초청 세미나

일시: 2007.6.5 (화) 11:00
연사: 이종길 교수 (Michigan Technological University)
제목: A Theoretical Model for Digestive Ripening

Syntheses of monodisperse nanoparticles have been intensively investigated for opto-electronic or other applications. Recently, gram quantities of monodisperse gold or silver nanoparticles were reported to be produced through a digestive ripening process, in which colloidal particles of size 2 to 40 nm are transformed to nearly monodisperse particles of 4 ~ 5 nm diameter. Digestive ripening, an example for inverse Ostwald ripening, is a puzzling phenomenon since it appears to despise the usual capillary consequence, i.e., reduction of interfacial free energy. We present a theoretical model which accounts for the self-assembled monodisperse state of such nanoparticles by considering the effect of charges on the particles and thus electrostatic energy in their coarsening behavior. An appropriate Gibbs-Thomson equation is first derived, and then particle growth rates are calculated. The results show that success of a monodisperse state depends, among others, on the initial particle distribution, and size distribution at equilibrium follows some of the thermodynamic principles observed in binary phase diagrams.

List of Articles
번호 제목 날짜
21 KI정기세미나 안내-조용훈,전석우,김범준교수 (08.11.11, 16:00~) file 2008.11.07
20 Seminar안내-Dr. Leonard H.Rome(CNSI), 08.11.1 2008.11.07
19 Seminar안내-Dr.Alfred J.Crosby(Univ.of Massachuseetts), 08.10.7 2008.11.07
18 Seminar안내-Dr.Changsoon Kim(Duke Univ.), 08.9.29 file 2008.11.07
17 Seminar안내-Prof. Yoshio Bando(NIMS), 08.8.26 2008.11.07
16 Seminar 안내-김수경박사(Caltech), 08.7.9 2008.11.07
15 Seminar안내-이호성박사(KOSEF), 08.6.26 2008.11.07
14 Seminar안내-진병두박사(KIST), 08.4.7 2008.11.07
13 Seminar 안내 - 전석우박사, Intellecture Ventures 2008.01.21
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9 Seminar: Continued Growth of Single-Walled Carbon Nanotubes from Open-Ended SWNT 2007.11.04
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» Seminar: A Theoretical Model for Digestive Ripening 2007.11.04
4 Seminar: Nano-Bio-Photonics: Photonics-Based Nano and Bio Technology 2007.11.04
3 Seminar: Origami assembly of nanophotonic and energy storage systems 2007.11.04
2 Seminar: Block Copolymer Electrolytes for Lithium Battery Application 2007.11.04
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