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Titre :
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Characterization of silica-coated silver nanoparticles prepared by a reverse micelle and hydrolysis–condensation process (2010)
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Auteurs :
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Nobuhiro Hagura, Auteur ;
W. Widiyastuti, Auteur ;
Ferry Iskandar, Auteur
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Type de document :
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Article : texte imprimé
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Dans :
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Chemical engineering journal (Vol. 156 N° 1, Janvier 2010)
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Article en page(s) :
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pp. 200-205
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Note générale :
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Génie Chimique
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Langues :
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Anglais
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Index. décimale :
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660
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Tags :
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Silica coating Microemulsion Hydrolysis reaction rate Surface plasmon resonance (SPR)
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Résumé :
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Described herein is the synthesis of individually silica-coated silver nanoparticles using a reverse micelle method followed by hydrolysis and condensation of tetraethoxysilane (TEOS). The size of a silica-coated silver nanoparticle can be controlled by changing the reaction time and the concentration of TEOS. By maintaining the size of a silver nanoparticle as a core particle at around 7 nm, the size of a silica-coated silver nanoparticle increased from 13 to 28 nm as the reaction time increased from 1 to 9 h due to an increase in silica thickness. The size of silica-coated silver nanoparticles also increased from 15 to 22 nm as the TEOS concentration increased from 7.8 to 40 mM. The size of a silica-coated silver nanoparticle can be accurately predicted using the rate of the hydrolysis reaction for TEOS. Neither the dispersion nor the film of silica-coated silver nanoparticles exhibited any peak shifting during surface plasmon resonance (SPR) at around 410 nm, whereas, without silica coating, the SPR peak of Ag film shifted to 466 nm.
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DEWEY :
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660
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ISSN :
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1385-8947
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En ligne :
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http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XFY0NY-2&_user=6909337&_coverDate=01%2F01%2F2010&_rdoc=28&_fmt=high&_orig=browse&_srch=doc-info%28%23toc%235228%232010%23998439998%231577393%23FLA%23display%23Volume%29&_cdi=5228&_sort=d&_doc
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