Documents disponibles écrits par cet auteur

Critical content of ultrahigh-molecular-weight polyethylene to induce the highest nucleation rate for isotactic polypropylene in blends / Wei Shao in Industrial & engineering chemistry research, Vol. 51 N° 49 (Décembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 49 (Décembre 2012) . - pp. 15953–15961 Titre : Critical content of ultrahigh-molecular-weight polyethylene to induce the highest nucleation rate for isotactic polypropylene in blends Type de document : texte imprimé Auteurs : Wei Shao, Auteur ; Yaqiong Zhang, Auteur ; Zhigang Wang, Auteur Année de publication : 2013 Article en page(s) : pp. 15953–15961 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Crystallization  kinetics  isotactic Résumé : The influence of the addition of low amounts of ultrahigh-molecular-weight polyethylene (UHMWPE) on the crystallization kinetics of isotactic polypropylene (iPP) in iPP/UHMWPE blends has been investigated by means of differential scanning calorimetry (DSC) and polarized optical microscopy. During the nonisothermal crystallization process, the primarily formed UHMWPE crystals serve as heterogeneous nucleating agents for iPP nucleation, whereas during the isothermal crystallization process, UHMWPE is in the molten state, iPP nucleation preferentially occurs at the UHMWPE and iPP phase interfaces, and the spherulitic growth rates are not obviously affected. It is particularly interesting to find a critical UHMWPE content (2.5 wt %) in the blends to induce the highest iPP nucleation rate; however, above the critical UHMWPE content, the iPP nucleation rate slows because of aggregation of the UHMWPE component. A delicately designed DSC measurement provides insight into the nucleation mechanism of iPP at the interfaces between the UHMWPE and iPP phase domains. It is proposed that the concentration fluctuations generated from the unstable inhomogeneous phase interfaces in the iPP/UHMWPE blends promote the formation of nuclei, which eventually enhances the nucleation and overall crystallization rates of the iPP component. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie302542x [article] Critical content of ultrahigh-molecular-weight polyethylene to induce the highest nucleation rate for isotactic polypropylene in blends [texte imprimé] / Wei Shao, Auteur ; Yaqiong Zhang, Auteur ; Zhigang Wang, Auteur . - 2013 . - pp. 15953–15961. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 49 (Décembre 2012) . - pp. 15953–15961 Mots-clés : Crystallization  kinetics  isotactic Résumé : The influence of the addition of low amounts of ultrahigh-molecular-weight polyethylene (UHMWPE) on the crystallization kinetics of isotactic polypropylene (iPP) in iPP/UHMWPE blends has been investigated by means of differential scanning calorimetry (DSC) and polarized optical microscopy. During the nonisothermal crystallization process, the primarily formed UHMWPE crystals serve as heterogeneous nucleating agents for iPP nucleation, whereas during the isothermal crystallization process, UHMWPE is in the molten state, iPP nucleation preferentially occurs at the UHMWPE and iPP phase interfaces, and the spherulitic growth rates are not obviously affected. It is particularly interesting to find a critical UHMWPE content (2.5 wt %) in the blends to induce the highest iPP nucleation rate; however, above the critical UHMWPE content, the iPP nucleation rate slows because of aggregation of the UHMWPE component. A delicately designed DSC measurement provides insight into the nucleation mechanism of iPP at the interfaces between the UHMWPE and iPP phase domains. It is proposed that the concentration fluctuations generated from the unstable inhomogeneous phase interfaces in the iPP/UHMWPE blends promote the formation of nuclei, which eventually enhances the nucleation and overall crystallization rates of the iPP component. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie302542x

Effects of film evaporation and condensation on oscillatory flow and heat transfer in an oscillating heat pipe / Wei Shao in Journal of heat transfer, Vol. 133 N° 4 (Avril 2011) 

Public ISBD [article]  in Journal of heat transfer > Vol. 133 N° 4 (Avril 2011) . - pp. [042901/1-11] Titre : Effects of film evaporation and condensation on oscillatory flow and heat transfer in an oscillating heat pipe Type de document : texte imprimé Auteurs : Wei Shao, Auteur ; Yuwen Zhang, Auteur Année de publication : 2011 Article en page(s) : pp. [042901/1-11] Note générale : Physique Langues : Anglais (eng) Mots-clés : Film  evaporation  Film  condensation  Oscillating  heat  pipe Index. décimale : 536 Chaleur. Thermodynamique Résumé : An advanced theoretical model of a U-shaped minichannel, a building block of a closed-end oscillating heat pipe, has been developed. Thin film evaporation in the evaporator and thin film condensation in the condenser, axial variation of surface temperature, and pressure loss at the bend are incorporated in this model. The sensible heat transfer coefficients between the liquid slug and the wall are obtained by analytical solution for laminar liquid flow and by empirical correlations for turbulent liquid flow. The effects of the inner diameter, evaporator temperature on the thermally induced oscillatory flow and heat transfer performance, and the mechanism of film condensation and evaporation are investigated. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&smode=strresults& [...] [article] Effects of film evaporation and condensation on oscillatory flow and heat transfer in an oscillating heat pipe [texte imprimé] / Wei Shao, Auteur ; Yuwen Zhang, Auteur . - 2011 . - pp. [042901/1-11]. Physique Langues : Anglais (eng) in Journal of heat transfer > Vol. 133 N° 4 (Avril 2011) . - pp. [042901/1-11] Mots-clés : Film  evaporation  Film  condensation  Oscillating  heat  pipe Index. décimale : 536 Chaleur. Thermodynamique Résumé : An advanced theoretical model of a U-shaped minichannel, a building block of a closed-end oscillating heat pipe, has been developed. Thin film evaporation in the evaporator and thin film condensation in the condenser, axial variation of surface temperature, and pressure loss at the bend are incorporated in this model. The sensible heat transfer coefficients between the liquid slug and the wall are obtained by analytical solution for laminar liquid flow and by empirical correlations for turbulent liquid flow. The effects of the inner diameter, evaporator temperature on the thermally induced oscillatory flow and heat transfer performance, and the mechanism of film condensation and evaporation are investigated. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&smode=strresults& [...]

Highly efficient dye - sensitized solar cells by using a mesostructured anatase TiO2 electrode with high dye loading capacity / Wei Shao in Industrial & engineering chemistry research, Vol. 49 N° 19 (Octobre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 19 (Octobre 2010) . - pp. 9111–9116 Titre : Highly efficient dye - sensitized solar cells by using a mesostructured anatase TiO2 electrode with high dye loading capacity Type de document : texte imprimé Auteurs : Wei Shao, Auteur ; Feng Gu, Auteur ; Chunzhong Li, Auteur Année de publication : 2010 Article en page(s) : pp. 9111–9116 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Mesostructured  anatase  Electrode Résumé : The growth and assembly of TiO2 nanostructures with enhanced charge transfer and light harvesting have attracted much attention for fabricating highly efficient dye-sensitized solar cells. In this study, we report an environmentally friendly and easy synthetic route for fabrication of mesostructured anatase TiO2 by controlling the hydrolyzing of n-butyl titanate in boric acid solution. The well-defined mesoporous TiO2 aggregates are obtained by the tensorial reaction-limited aggregation probability. The photovoltaic measurements indicate that the mesoporous TiO2 layer enhances the dye loading capacity, the electron transfer efficiency, and the photocurrent of the cell, contributing to the significant improvement of the energy conversion efficiency of the dye-sensitized solar cells. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901692z [article] Highly efficient dye - sensitized solar cells by using a mesostructured anatase TiO2 electrode with high dye loading capacity [texte imprimé] / Wei Shao, Auteur ; Feng Gu, Auteur ; Chunzhong Li, Auteur . - 2010 . - pp. 9111–9116. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 19 (Octobre 2010) . - pp. 9111–9116 Mots-clés : Mesostructured  anatase  Electrode Résumé : The growth and assembly of TiO2 nanostructures with enhanced charge transfer and light harvesting have attracted much attention for fabricating highly efficient dye-sensitized solar cells. In this study, we report an environmentally friendly and easy synthetic route for fabrication of mesostructured anatase TiO2 by controlling the hydrolyzing of n-butyl titanate in boric acid solution. The well-defined mesoporous TiO2 aggregates are obtained by the tensorial reaction-limited aggregation probability. The photovoltaic measurements indicate that the mesoporous TiO2 layer enhances the dye loading capacity, the electron transfer efficiency, and the photocurrent of the cell, contributing to the significant improvement of the energy conversion efficiency of the dye-sensitized solar cells. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901692z