Documents disponibles écrits par cet auteur

Ag/Au-decorated Fe3O4/SiO2 composite nanospheres for catalytic applications / Ling Li in Acta materialia, Vol. 58 N° 11 (Juin 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 11 (Juin 2010) . - pp. 3825–3831 Titre : Ag/Au-decorated Fe3O4/SiO2 composite nanospheres for catalytic applications Type de document : texte imprimé Auteurs : Ling Li, Auteur ; Eugene S.G. Choo, Auteur ; Xiaosheng Tang, Auteur Année de publication : 2011 Article en page(s) : pp. 3825–3831 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Silica  Superparamagnetic  Composite  Nanoparticle  Catalytic Résumé : Noble metal particles in nanoscale (Au, Ag, Pt, etc.) have attracted intensive research interest due to their promising catalysis properties. However, the practical applications of these nanoparticle catalysts are always jeopardized by two problems. One is the difficulty in recovering the used nanoparticles and the other arises from the low catalytic efficiency due to the aggregation of the nanoparticles. In this work, Ag/Au nanoparticles were distributed onto spherical superparamagnetic carriers (SSCNs), which were fabricated through a facile oil-in-DEG emulsion route. The Ag/Au nanoparticles were attached onto the SSCNs by two steps. The Au seeds were attached onto the silica surface through electrostatic attraction first, and the Ag nanoparticles were grown on the basis of the Au seeds. The obtained Ag/Au–SSCN composite nanospheres demonstrated promising catalytic properties, which could also be recycled very easily by using a magnet. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410002107 [article] Ag/Au-decorated Fe3O4/SiO2 composite nanospheres for catalytic applications [texte imprimé] / Ling Li, Auteur ; Eugene S.G. Choo, Auteur ; Xiaosheng Tang, Auteur . - 2011 . - pp. 3825–3831. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 11 (Juin 2010) . - pp. 3825–3831 Mots-clés : Silica  Superparamagnetic  Composite  Nanoparticle  Catalytic Résumé : Noble metal particles in nanoscale (Au, Ag, Pt, etc.) have attracted intensive research interest due to their promising catalysis properties. However, the practical applications of these nanoparticle catalysts are always jeopardized by two problems. One is the difficulty in recovering the used nanoparticles and the other arises from the low catalytic efficiency due to the aggregation of the nanoparticles. In this work, Ag/Au nanoparticles were distributed onto spherical superparamagnetic carriers (SSCNs), which were fabricated through a facile oil-in-DEG emulsion route. The Ag/Au nanoparticles were attached onto the SSCNs by two steps. The Au seeds were attached onto the silica surface through electrostatic attraction first, and the Ag nanoparticles were grown on the basis of the Au seeds. The obtained Ag/Au–SSCN composite nanospheres demonstrated promising catalytic properties, which could also be recycled very easily by using a magnet. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410002107

On the infiltration mode during fabrication of aluminium composite / Peng Yu in Acta materialia, Vol. 58 N° 10 (Juin 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 10 (Juin 2010) . - pp. 3790–3797 Titre : On the infiltration mode during fabrication of aluminium composite Type de document : texte imprimé Auteurs : Peng Yu, Auteur ; Ma Qian, Auteur ; Ling Li, Auteur Année de publication : 2011 Article en page(s) : pp. 3790–3797 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Infiltration  Al  alloy  Slug  flow  Eutectic Résumé : Porous Al 6061–2Mg–1Sn–3nylon preforms were nitrided and subsequently infiltrated with Al–Si and Al–Si–Mg alloys at different temperatures. Different infiltration modes were identified and confirmed by numerical simulation. When infiltration happens under conditions close to the eutectic points, it proceeds in the conventional slug flow mode with a well-defined infiltration front. However, as the infiltration conditions depart from the eutectic points, the infiltration mode changes gradually to extreme non-slug flow, where the infiltrant preferentially fills small pores irrespective of their distance from the infiltrant entrance, leading to homogeneous infiltrated structures without any infiltration front. The occurrence of different infiltration modes can be attributed to the competition between thermodynamic and kinetic factors. Extreme non-slug flow occurs under thermodynamically favourable conditions where the preform is well wetted by an infiltrant with sufficient fluidity. In contrast, slug flow occurs under kinetically favourable conditions when the low infiltration temperature at the eutectic points makes mass transport difficult. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410001679 [article] On the infiltration mode during fabrication of aluminium composite [texte imprimé] / Peng Yu, Auteur ; Ma Qian, Auteur ; Ling Li, Auteur . - 2011 . - pp. 3790–3797. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 10 (Juin 2010) . - pp. 3790–3797 Mots-clés : Infiltration  Al  alloy  Slug  flow  Eutectic Résumé : Porous Al 6061–2Mg–1Sn–3nylon preforms were nitrided and subsequently infiltrated with Al–Si and Al–Si–Mg alloys at different temperatures. Different infiltration modes were identified and confirmed by numerical simulation. When infiltration happens under conditions close to the eutectic points, it proceeds in the conventional slug flow mode with a well-defined infiltration front. However, as the infiltration conditions depart from the eutectic points, the infiltration mode changes gradually to extreme non-slug flow, where the infiltrant preferentially fills small pores irrespective of their distance from the infiltrant entrance, leading to homogeneous infiltrated structures without any infiltration front. The occurrence of different infiltration modes can be attributed to the competition between thermodynamic and kinetic factors. Extreme non-slug flow occurs under thermodynamically favourable conditions where the preform is well wetted by an infiltrant with sufficient fluidity. In contrast, slug flow occurs under kinetically favourable conditions when the low infiltration temperature at the eutectic points makes mass transport difficult. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410001679

Oscillation and chaos in combined heat transfer by natural convection, conduction, and surface radiation in an open cavity / Zhiyun Wang in Journal of heat transfer, Vol 134 N° 9 (Septembre 2012) 

Public ISBD [article]  in Journal of heat transfer > Vol 134 N° 9 (Septembre 2012) . - 06 p. Titre : Oscillation and chaos in combined heat transfer by natural convection, conduction, and surface radiation in an open cavity Type de document : texte imprimé Auteurs : Zhiyun Wang, Auteur ; Mo Yang, Auteur ; Ling Li, Auteur Année de publication : 2012 Article en page(s) : 06 p. Note générale : heat transfer Langues : Anglais (eng) Mots-clés : heat  tranfer;  mass  transfer;  natural  convection  mixed  convection Index. décimale : 536 Chaleur. Thermodynamique Résumé : Combined heat transfer by natural convection, conduction, and surface radiation in an open cavity is solved numerically by employing SIMPLE algorithm with QUICK scheme. The unsteady-state flow and heat transfer exhibited periodic oscillating or chaotic behaviors due to formation of the thermal plumes at the bottom wall. If the formation of thermal plumes is periodic, the oscillations of flow and heat transfer are also periodic. On the other hand, chaotic oscillations of flow and heat transfer can be observed when the formation of thermal plumes at the bottom surface is chaotic. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JHTRAO000134000009 [...] [article] Oscillation and chaos in combined heat transfer by natural convection, conduction, and surface radiation in an open cavity [texte imprimé] / Zhiyun Wang, Auteur ; Mo Yang, Auteur ; Ling Li, Auteur . - 2012 . - 06 p. heat transfer Langues : Anglais (eng) in Journal of heat transfer > Vol 134 N° 9 (Septembre 2012) . - 06 p. Mots-clés : heat  tranfer;  mass  transfer;  natural  convection  mixed  convection Index. décimale : 536 Chaleur. Thermodynamique Résumé : Combined heat transfer by natural convection, conduction, and surface radiation in an open cavity is solved numerically by employing SIMPLE algorithm with QUICK scheme. The unsteady-state flow and heat transfer exhibited periodic oscillating or chaotic behaviors due to formation of the thermal plumes at the bottom wall. If the formation of thermal plumes is periodic, the oscillations of flow and heat transfer are also periodic. On the other hand, chaotic oscillations of flow and heat transfer can be observed when the formation of thermal plumes at the bottom surface is chaotic. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JHTRAO000134000009 [...]