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Biomimic superhydrophobic surface with high adhesive forces / Jinming Xi in Industrial & engineering chemistry research, Vol. 47 N°17 (Septembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N°17 (Septembre 2008) . - p. 6354–6357 Titre : Biomimic superhydrophobic surface with high adhesive forces Type de document : texte imprimé Auteurs : Jinming Xi, Auteur ; Lei Jiang, Auteur Année de publication : 2008 Article en page(s) : p. 6354–6357 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Polydimethylsiloxane  surfaces  Water  contact  angle  Rose  petal--microstructures  Adhesive  forces Résumé : Superhydrophobic polydimethylsiloxane (PDMS) surfaces that contain microbinary and nanobinary structures with a water contact angle (CA) of >150° are created by duplicating the microstructures of a rose petal. The resulting surface has the same microstructures and high adhesive property as a rose petal; the water CA of the surface is as high as 154.3°. Interestingly, this surface can hold water droplets through the use of very strong adhesive forces, and the maximum adhesive force is ~63.8 μN. Furthermore, the resulting surface has another important property; it shows superhydrophobic property in a wide range of pH values from 1.07 to 13.76. Therefore, it is believed that the as-prepared surface can be used in the fabrication of chemical engineering materials, microfluidic devices, and the transportation of a small amount of corrosive liquids. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071603n [article] Biomimic superhydrophobic surface with high adhesive forces [texte imprimé] / Jinming Xi, Auteur ; Lei Jiang, Auteur . - 2008 . - p. 6354–6357. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N°17 (Septembre 2008) . - p. 6354–6357 Mots-clés : Polydimethylsiloxane  surfaces  Water  contact  angle  Rose  petal--microstructures  Adhesive  forces Résumé : Superhydrophobic polydimethylsiloxane (PDMS) surfaces that contain microbinary and nanobinary structures with a water contact angle (CA) of >150° are created by duplicating the microstructures of a rose petal. The resulting surface has the same microstructures and high adhesive property as a rose petal; the water CA of the surface is as high as 154.3°. Interestingly, this surface can hold water droplets through the use of very strong adhesive forces, and the maximum adhesive force is ~63.8 μN. Furthermore, the resulting surface has another important property; it shows superhydrophobic property in a wide range of pH values from 1.07 to 13.76. Therefore, it is believed that the as-prepared surface can be used in the fabrication of chemical engineering materials, microfluidic devices, and the transportation of a small amount of corrosive liquids. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071603n

Effect of rib spacing on heat transfer in a two pass rectangular channel (AR = 2:1) at high rotation numbers / Lei Jiang 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) . - 09 p. Titre : Effect of rib spacing on heat transfer in a two pass rectangular channel (AR = 2:1) at high rotation numbers Type de document : texte imprimé Auteurs : Lei Jiang, Auteur ; Je-Chin Han, Auteur ; Michael Huh, Auteur Année de publication : 2012 Article en page(s) : 09 p. Note générale : heat transfer Langues : Anglais (eng) Mots-clés : gas  turbine  heat  transfer;  forced  convection;  heat  transfer  enhancement Index. décimale : 536 Chaleur. Thermodynamique Résumé : In this paper, the effect of rib spacing on heat transfer in a rotating two-passage channel (aspect ratio, AR = 2:1) at orientation angle of 135 deg was studied. Parallel ribs were applied' on leading and trailing walls of the rotating channel at the flow angle of 45 deg. The rib-height-to-hydraulic diameter ratio (e/Dh) was 0.098. The rib-pitch-to-rib-height (P/e) ratios studied were 5, 7.5, and 10. For each rib spacing, tests were taken at five Reynolds numbers from 10,000 to 40,000, and for each Reynolds number, experiments were conducted at four rotational speeds up to 400 rpm. Results show that the heat transfer enhancement increases with decreasing P/e from 10 to 5 under nonrotation conditions. However, the effect of rotation on the heat transfer enhancement remains about the same for varying P/e from 10 to 5. Correlations of Nusselt number ratio (Nu/Nus) to rotation number (Ro) or local buoyancy parameter (Box) are existent on all surfaces (leading, trailing, inner and outer walls, and tip cap region) in the two-passage 2:1 aspect ratio channel. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JHTRAO000134000009 [...] [article] Effect of rib spacing on heat transfer in a two pass rectangular channel (AR = 2:1) at high rotation numbers [texte imprimé] / Lei Jiang, Auteur ; Je-Chin Han, Auteur ; Michael Huh, Auteur . - 2012 . - 09 p. heat transfer Langues : Anglais (eng) in Journal of heat transfer > Vol 134 N° 9 (Septembre 2012) . - 09 p. Mots-clés : gas  turbine  heat  transfer;  forced  convection;  heat  transfer  enhancement Index. décimale : 536 Chaleur. Thermodynamique Résumé : In this paper, the effect of rib spacing on heat transfer in a rotating two-passage channel (aspect ratio, AR = 2:1) at orientation angle of 135 deg was studied. Parallel ribs were applied' on leading and trailing walls of the rotating channel at the flow angle of 45 deg. The rib-height-to-hydraulic diameter ratio (e/Dh) was 0.098. The rib-pitch-to-rib-height (P/e) ratios studied were 5, 7.5, and 10. For each rib spacing, tests were taken at five Reynolds numbers from 10,000 to 40,000, and for each Reynolds number, experiments were conducted at four rotational speeds up to 400 rpm. Results show that the heat transfer enhancement increases with decreasing P/e from 10 to 5 under nonrotation conditions. However, the effect of rotation on the heat transfer enhancement remains about the same for varying P/e from 10 to 5. Correlations of Nusselt number ratio (Nu/Nus) to rotation number (Ro) or local buoyancy parameter (Box) are existent on all surfaces (leading, trailing, inner and outer walls, and tip cap region) in the two-passage 2:1 aspect ratio channel. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JHTRAO000134000009 [...]

SOx oxidation and adsorption by CeO2/MgO / Lei Jiang in Industrial & engineering chemistry research, Vol. 50 N° 8 (Avril 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 8 (Avril 2011) . - pp. 4398–4404 Titre : SOx oxidation and adsorption by CeO2/MgO : synergistic effect between CeO2 and MgO in the fluid catalytic cracking process Type de document : texte imprimé Auteurs : Lei Jiang, Auteur ; Min Wei, Auteur ; Xiangyu Xu, Auteur Année de publication : 2011 Article en page(s) : pp. 4398–4404 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : SOx  Oxidation  Fluid  catalytic Résumé : The sulfur-transfer catalyst plays an important role in the fluid catalytic cracking (FCC) process through which the sulfur oxides (SOx) are removed from flue gas. This work reports the synergistic effect between CeO2 and MgO on the SOx oxidation and adsorption in the FCC process. The CeO2 acts as the oxidation promoter, while MgO is the active phase for SOx adsorption. The influence of crystal size on the synergistic effect between CeO2 and MgO on the SOx oxidation and adsorption was investigated. It was observed that the initial apparent SOx pick-up rate decreases with the increase in the CeO2 crystal size, while the maximum SOx oxidation and adsorption capacity decreases with the increase in the MgO crystal size. Therefore, this work provides a detailed understanding of the synergistic effect between CeO2 and MgO for the SOx pick-up, which is crucial for the rational design and preparation of the sulfur-transfer catalysts. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie102243y [article] SOx oxidation and adsorption by CeO2/MgO : synergistic effect between CeO2 and MgO in the fluid catalytic cracking process [texte imprimé] / Lei Jiang, Auteur ; Min Wei, Auteur ; Xiangyu Xu, Auteur . - 2011 . - pp. 4398–4404. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 8 (Avril 2011) . - pp. 4398–4404 Mots-clés : SOx  Oxidation  Fluid  catalytic Résumé : The sulfur-transfer catalyst plays an important role in the fluid catalytic cracking (FCC) process through which the sulfur oxides (SOx) are removed from flue gas. This work reports the synergistic effect between CeO2 and MgO on the SOx oxidation and adsorption in the FCC process. The CeO2 acts as the oxidation promoter, while MgO is the active phase for SOx adsorption. The influence of crystal size on the synergistic effect between CeO2 and MgO on the SOx oxidation and adsorption was investigated. It was observed that the initial apparent SOx pick-up rate decreases with the increase in the CeO2 crystal size, while the maximum SOx oxidation and adsorption capacity decreases with the increase in the MgO crystal size. Therefore, this work provides a detailed understanding of the synergistic effect between CeO2 and MgO for the SOx pick-up, which is crucial for the rational design and preparation of the sulfur-transfer catalysts. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie102243y