Photoacoustic Studies of Colloidal Silica Particles after MeV Ion-Induced Shape Deformation

作     者：Ulises Morales Rosalba Castaneda-Guzman Santiago Jesus Perez-Ruiz Juan Carlos Cheang Wong 

作者机构：Instituto de FisicaUniversidad Nacional Autonoma de MexicoMexicoD.F.Mexico Centro de Ciencias Aplicadas y Desarrollo TecnologicoUniversidad Nacional Autonoma de MexicoMexicoD.F.Mexico 

出 版 物：《New Journal of Glass and Ceramics》 (玻璃与陶瓷期刊（英文）)

年 卷 期：2011年第1卷第2期

页      面：63-68页

学科分类：1002[医学-临床医学] 100214[医学-肿瘤学] 10[医学] 

基　　金：supported by DGAPA-UNAM projects IN-101210,IN-117208 CONACYT grants No.128274,123143 and 82919 the ICyTDF for the financial support 

主　　题：Pulsed Laser Photoacoustic Spectroscopy Silica Particles Ion Irradiation 

摘      要：Ordered arrays of colloidal submicrometer-sized silica particles deposited onto silicon wafers were irradiated with MeV Si ions. The spherical silica particles turned into oblate particles as a result of the increase of the particle dimension perpendicular to the ion beam direction and the decrease in the parallel direction. Pulsed laser photoacoustic spectroscopy was used to study the structural changes of the silica particles after the ion-induced shape deformation. Our purpose is to correlate the mechanical vibrations generated by the pulsed laser as a function of the Si irradiation parameters: ion energy and fluence. Fast Fourier transform analysis of the photoacoustic signal was carried out in order to obtain the normal vibration modes of the system. The size, size distribution and shape of the silica particles were determined by scanning electron microscopy. Our results revealed significant structural differences between the spherical and the deformed silica particles.