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Anisotropic deformation of colloidal particles under MeV ion irradiation

By T. van Dillen, E. Snoeks, W. Fukarek, C.M. van Kats, K.P. Velikov, A. van Blaaderen and A. Polman

Abstract

Spherical silica colloids with a diameter of 1.0 um made by wet chemical synthesis, were irradiated with 2-16 MeV Au ions at fluences ranging from 2*10^(14) to 11*10^(14) cm^(-2). The irradiation induces an anisotropic plastic deformation turning the sperical colloids into ellipsional oblates. After 16 MeV Au irradiation to a fluence of 11*10^(14) cm^(-2) a size-asapect ratio of 4.7 is achieved. The size polydispersity (~3%) remains unaffected by the irradiation. The transverse diameter increases with the electronic energy loss above a threshold value of ~0.6 keV/nm. Non-ellipsoidal colloids are observed in the case that the projected ion range is smaller than the colloid diameter. The deformation effect is also observed for micro-crystalline ZnS and amorphous TiO2 colloids, as well as ZnS/SiO2 core/shell particles. No deformation is observed for crystaline Al2O3 and Ag particles. The data provide strong support for the thermalspike model of anisotropic deformation

Topics: Natuur- en Sterrenkunde, Anisotropic deformation, Ion irradiation, Colloid, SiO2, Thermal spike
Year: 2001
OAI identifier: oai:dspace.library.uu.nl:1874/1515
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