, The authors thank University of Rennes 1 for the FE-SEM images as well as the people involved in LINK coordination, particularly Dr. Mari Kono, David Lechevalierand Dr. Benjamin Dierre of Saint-Gobain Japan.Raman investigations were performed using facilities available on SIR Plateform 'SIR for Spectroscopie et Imagerie Raman' from UMS 2001 CNRS-Université Rennes 1. Authors are very grateful to Bertrand Lefeuvre from ISCR UMR 6226 CNRS-Université Rennes 1 and Alain Moréac from IPR UMR 6252 CNRS-Université Rennes1. Notes and references ?Footnotes relating to the main text should appear here. These might include comments relevant to but not central to the matter under discussion

, * Email: adele.renaud@hotmail.fr; stephane.cordier@univ-rennes1.fr

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