The role of the electron tunneling effect in the coagulation kinetics of polydisperse metal nanocolloids

Тип публикации: статья из журнала

Год издания: 2012

Идентификатор DOI: 10.1134/S1061933X12030052

Ключевые слова: Coagulation kinetics, Different sizes, Electron transfer, Electron work functions, Electrostatic effect, Monodisperse systems, Nano-colloids, Pair interactions, Polydisperse colloidal systems, Polydisperses, Coagulation, Colloids, Electron transitions, Electron tunneling, Polydispersity, Silver

Аннотация: The energy of pair interactions between metal nanoparticles of different sizes is shown to be able to increase upon coagulation due to the additional electrostatic effect resulting from mutual heteropolar charging of the particles. The tunnel electron transfer occurring upon the collisions between particles of different sizes may be the reason for the charging. The transfer is caused by the dependence of the electron work function on the particle size. The electron transfer through the interparticle gap equalizes the Fermi levels in particles of different sizes and is associated with this dependence. Using the example of bimodal silver nanocolloids, it is shown that mutual heteropolar charging of particles with different sizes may accelerate the coagulation of polydisperse colloidal systems by an order of magnitude or more as compared with monodisperse systems, in which this effect is absent.

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Издание

Журнал: COLLOID JOURNAL

Выпуск журнала: Vol. 74, Is. 3

Номера страниц: 305-312

ISSN журнала: 1061933X

Место издания: NEW YORK

Издатель: MAIK NAUKA/INTERPERIODICA/SPRINGER

Авторы

  • Karpov S.V. (Siberian Federal University)
  • Semina P.N. (Kirensky Institute of Physics,Siberian Branch,Russian Academy of Sciences)
  • Gavrilyuk A.P. (Institute of Computational Modeling,Siberian Branch,Russian Academy of Sciences)

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