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has been cited by the following article:

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

  AUTHORS: Ulises Morales, Rosalba Castañeda-Guzmán, Santiago Jesús Pérez-Ruiz, Juan Carlos Cheang Wong

  KEYWORDS: Pulsed Laser Photoacoustic Spectroscopy, Silica Particles, Ion Irradiation

  JOURNAL NAME: New Journal of Glass and Ceramics, Vol.1 No.2, July 21, 2011

  ABSTRACT: 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.