Documents disponibles écrits par cet auteur

Characterization of silica-coated silver nanoparticles prepared by a reverse micelle and hydrolysis–condensation process / Nobuhiro Hagura in Chemical engineering journal, Vol. 156 N° 1 (Janvier 2010) 

Public ISBD [article]  in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 200-205 Titre : Characterization of silica-coated silver nanoparticles prepared by a reverse micelle and hydrolysis–condensation process Type de document : texte imprimé Auteurs : Nobuhiro Hagura, Auteur ; W. Widiyastuti, Auteur ; Ferry Iskandar, Auteur Année de publication : 2010 Article en page(s) : pp. 200-205 Note générale : Génie Chimique Langues : Anglais (eng) Mots-clés : Silica  coating  Microemulsion  Hydrolysis  reaction  rate  Surface  plasmon  resonance  (SPR) Index. décimale : 660 Résumé : 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. DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XFY0NY-2&_user=6 [...] [article] Characterization of silica-coated silver nanoparticles prepared by a reverse micelle and hydrolysis–condensation process [texte imprimé] / Nobuhiro Hagura, Auteur ; W. Widiyastuti, Auteur ; Ferry Iskandar, Auteur . - 2010 . - pp. 200-205. Génie Chimique Langues : Anglais (eng) in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 200-205 Mots-clés : Silica  coating  Microemulsion  Hydrolysis  reaction  rate  Surface  plasmon  resonance  (SPR) Index. décimale : 660 Résumé : 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. DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XFY0NY-2&_user=6 [...]

Design of a highly ordered and uniform porous structure with multisized pores in film and particle forms using a template-driven self-assembly technique / Asep Bayu Dani Nandiyanto in Acta materialia, Vol. 58 N° 1 (Janvier 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 1 (Janvier 2010) . - pp. 282–289 Titre : Design of a highly ordered and uniform porous structure with multisized pores in film and particle forms using a template-driven self-assembly technique Type de document : texte imprimé Auteurs : Asep Bayu Dani Nandiyanto, Auteur ; Nobuhiro Hagura, Auteur ; Ferry Iskandar, Auteur Année de publication : 2010 Article en page(s) : pp. 282–289 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Porous  structure  film  Porous  particle  Ultralow  refractive  index  Spray-drying  method  Dip-coating  method Résumé : A highly ordered arrangement of pores with multiple sizes in film and particle forms was successfully prepared using the dip-coating and spray-drying methods, respectively. The template-driven self-assembly technique was effective when a combination of 5 nm silica (as a model of an inorganic nanoparticle) and two different sizes of monodispersed polystyrene (PS) spheres (as models of the template) were self-assembled to produce a composite silica/PS template. Heat treatment was then used to remove the PS, which produced the porous particle. A material with spherical pores in an “art-design” organization was produced. The size of the pores (large pore: 100–1000 nm; small pore: 30–200 nm) could be controlled simply by adjusting the PS size. Sufficient numbers of large/small pores made it possible to produce a material of ultralow density with an ultralow refractive index, because the multiple pores allocated free space, all of which was confirmed by calculation. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409006016 [article] Design of a highly ordered and uniform porous structure with multisized pores in film and particle forms using a template-driven self-assembly technique [texte imprimé] / Asep Bayu Dani Nandiyanto, Auteur ; Nobuhiro Hagura, Auteur ; Ferry Iskandar, Auteur . - 2010 . - pp. 282–289. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 1 (Janvier 2010) . - pp. 282–289 Mots-clés : Porous  structure  film  Porous  particle  Ultralow  refractive  index  Spray-drying  method  Dip-coating  method Résumé : A highly ordered arrangement of pores with multiple sizes in film and particle forms was successfully prepared using the dip-coating and spray-drying methods, respectively. The template-driven self-assembly technique was effective when a combination of 5 nm silica (as a model of an inorganic nanoparticle) and two different sizes of monodispersed polystyrene (PS) spheres (as models of the template) were self-assembled to produce a composite silica/PS template. Heat treatment was then used to remove the PS, which produced the porous particle. A material with spherical pores in an “art-design” organization was produced. The size of the pores (large pore: 100–1000 nm; small pore: 30–200 nm) could be controlled simply by adjusting the PS size. Sufficient numbers of large/small pores made it possible to produce a material of ultralow density with an ultralow refractive index, because the multiple pores allocated free space, all of which was confirmed by calculation. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409006016