| Saturation of the ion-hammering effect for large non-hydrostatic capillarity stresses in colloidal silica nanoparticles. | |
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MedLine Citation:
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PMID: 22047998 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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We investigate the role of capillarity stresses on the ion-hammering phenomenon when sub-micrometer colloidal particles are considered. To this end, nearly monodisperse, chemically synthesized silica (SiO(2)) colloids (100, 300 and 600 nm) were irradiated at room temperature (300 K) with 4 MeV Au ions for fluences up to Φ = 1.8 × 10(16) cm( - 2). It has been taken for granted that the transverse dimension of an ion-deformable amorphous material grows exponentially with the irradiation fluence, L(φ) = L(0)exp[A(0)Φ]. Here, we show that for sub-micrometer particles the irradiation-induced deformation saturates for larger fluences, [Formula: see text] const. The saturation fluence depends on the initial dimension of the colloidal nanoparticles: the smaller the dimension of the colloids, the lower the saturation fluence. Experimental data are successfully accounted for by having recourse to a phenomenological model first developed by Klaumünzer and further elaborated by van Dillen. We also estimate the evolution with fluence of the principal stresses inside the particles, σ(11)(φ) = σ(22)(φ) and σ(33)(φ), and we show that they evolve toward a steady-state value following a sigmoidal-like behavior. Furthermore, when stresses induced by the surface curvature become non-negligible the approximation often made that the deformation strain rate, A(0) = dL/L dΦ, remains constant upon irradiation is no longer valid. We show that A(0) evolves with the irradiation fluence, e.g. [Formula: see text], and we relate this behavior to the evolution of the stresses upon irradiation. Finally, this work allows us to define the limits of the ion-hammering effect when the non-hydrostatic capillarity stresses become important. |
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Authors:
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Giancarlo Rizza; Yaasiin Ramjauny; Marc Hayoun; Sandrine Perruchas; Thierry Gacoin; Patrick Kluth; Mark C Ridgway |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-11-02 |
Journal Detail:
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Title: Nanotechnology Volume: 22 ISSN: 1361-6528 ISO Abbreviation: - Publication Date: 2011 Nov |
Date Detail:
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Created Date: 2011-11-3 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101241272 Medline TA: Nanotechnology Country: - |
Other Details:
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Languages: ENG Pagination: 475302 Citation Subset: - |
Affiliation:
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Ecole Polytechnique, Laboratoire des Solides Irradiés (LSI), CEA/DSM/IRAMIS-CNRS, 91128 Palaiseau Cedex, France. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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