Documents disponibles écrits par cet auteur

Controllable preparation of polyacrylamide hydrogel microspheres in a coaxial microfluidic device / Bodong Yang in Industrial & engineering chemistry research, Vol. 51 N° 26 (Juillet 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 26 (Juillet 2012) . - pp. 9016-9022 Titre : Controllable preparation of polyacrylamide hydrogel microspheres in a coaxial microfluidic device Type de document : texte imprimé Auteurs : Bodong Yang, Auteur ; Yangcheng Lu, Auteur ; Guangsheng Luo, Auteur Année de publication : 2012 Article en page(s) : pp. 9016-9022 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Fluid  mechanics  Microfluidics  Microsphere  Preparation Résumé : A thermal-initiated polymerization procedure is described for the controlled preparation of monodispersed polyacrylamide (PAM) hydrogel microspheres. A coaxial microfluidic device was designed to disperse uniform drops (∼500 μm) of acrylamide monomer aqueous solution into n-octane. Using a delay loop immersed into a heat bath, the polymerization is initiated and carried out in separate droplets. Combining the improvement of heat transfer in the microfluidic device and the sufficient addition of n-octane, the controllable preparation can still be achieved at 95 °C, much higher than 20-60 °C as reported prevalently. Herein, the PAM microspheres can be prepared within 2 min or less, with the CV of diameter less than 4%. Furthermore, based on this controllable reaction platform, PAM microspheres were prepared at various reaction temperatures (higher than 90 °C) and monomer solution compositions to investigate the fundamental rules of controlling on their skeleton structure and absorbent capacity in deionized water. DEWEY : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26107459 [article] Controllable preparation of polyacrylamide hydrogel microspheres in a coaxial microfluidic device [texte imprimé] / Bodong Yang, Auteur ; Yangcheng Lu, Auteur ; Guangsheng Luo, Auteur . - 2012 . - pp. 9016-9022. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 26 (Juillet 2012) . - pp. 9016-9022 Mots-clés : Fluid  mechanics  Microfluidics  Microsphere  Preparation Résumé : A thermal-initiated polymerization procedure is described for the controlled preparation of monodispersed polyacrylamide (PAM) hydrogel microspheres. A coaxial microfluidic device was designed to disperse uniform drops (∼500 μm) of acrylamide monomer aqueous solution into n-octane. Using a delay loop immersed into a heat bath, the polymerization is initiated and carried out in separate droplets. Combining the improvement of heat transfer in the microfluidic device and the sufficient addition of n-octane, the controllable preparation can still be achieved at 95 °C, much higher than 20-60 °C as reported prevalently. Herein, the PAM microspheres can be prepared within 2 min or less, with the CV of diameter less than 4%. Furthermore, based on this controllable reaction platform, PAM microspheres were prepared at various reaction temperatures (higher than 90 °C) and monomer solution compositions to investigate the fundamental rules of controlling on their skeleton structure and absorbent capacity in deionized water. DEWEY : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26107459

Improving selectivity of temperature-sensitive exothermal reactions with microreactor / Kai Wang in Industrial & engineering chemistry research, Vol. 47 n°14 (Juillet 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°14 (Juillet 2008) . - p. 4683–4688 Titre : Improving selectivity of temperature-sensitive exothermal reactions with microreactor Type de document : texte imprimé Auteurs : Kai Wang, Auteur ; Yangcheng Lu, Auteur ; Huawei Shao, Auteur ; Guangsheng Luo, Auteur Année de publication : 2008 Article en page(s) : p. 4683–4688 Note générale : Bibliogr. p. 4688 Langues : Anglais (eng) Mots-clés : Temperature-sensitive  exothermal  reaction;  Cyclohexanecarboxylic  acid;  Oleum Résumé : The selectivity of temperature-sensitive exothermal reaction, especially for a fast reaction system, is hard to control in chemical synthesis process. Traditionally, reducing the reaction temperature is applied to control byproduct. Nowadays, the confinement of the reaction temperature can be released by using microreactors. To demonstrate this, the fast exothermal reaction between cyclohexanecarboxylic acid and oleum was chosen as an experimental system in this work. An adiabatic micropore dispersion capillary reactor was developed to control the reaction selectivity at relatively high temperature. The results showed that 5−30 μm dispersed scale of oleum was reached in this microreactor, and nearly 100% selectivity was obtained at a relatively high product temperature, 50−60 °C, with 100% conversion of oleum. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800318q [article] Improving selectivity of temperature-sensitive exothermal reactions with microreactor [texte imprimé] / Kai Wang, Auteur ; Yangcheng Lu, Auteur ; Huawei Shao, Auteur ; Guangsheng Luo, Auteur . - 2008 . - p. 4683–4688. Bibliogr. p. 4688 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°14 (Juillet 2008) . - p. 4683–4688 Mots-clés : Temperature-sensitive  exothermal  reaction;  Cyclohexanecarboxylic  acid;  Oleum Résumé : The selectivity of temperature-sensitive exothermal reaction, especially for a fast reaction system, is hard to control in chemical synthesis process. Traditionally, reducing the reaction temperature is applied to control byproduct. Nowadays, the confinement of the reaction temperature can be released by using microreactors. To demonstrate this, the fast exothermal reaction between cyclohexanecarboxylic acid and oleum was chosen as an experimental system in this work. An adiabatic micropore dispersion capillary reactor was developed to control the reaction selectivity at relatively high temperature. The results showed that 5−30 μm dispersed scale of oleum was reached in this microreactor, and nearly 100% selectivity was obtained at a relatively high product temperature, 50−60 °C, with 100% conversion of oleum. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800318q

Mechanism analysis on the two-phase flow characteristics in coalescence-dispersion pulsed-sieve-plate extraction columns / Tang Xiaojin in Industrial & engineering chemistry research, Vol. 47 N° 23 (Décembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9724–9727 Titre : Mechanism analysis on the two-phase flow characteristics in coalescence-dispersion pulsed-sieve-plate extraction columns Type de document : texte imprimé Auteurs : Tang Xiaojin, Auteur ; Guangsheng Luo, Auteur ; Wang Jiading, Auteur Année de publication : 2009 Article en page(s) : p. 9724–9727 Note générale : Chemistry engineering Langues : Anglais (eng) Mots-clés : Mechanism  analysis  Flow  characteristics  Pulsed-Sieve Résumé : To investigate the influence of drop breakage and drop coalescence, a mechanism analysis of the liquid−liquid two-phase flow characteristics in the coalescence−dispersion pulsed-sieve-plate extraction column (CDPSEC) is performed. According to the experimental results, the operation of CDPSEC can be divided by a turning point into two regions: the drop breakage control region with higher holdup of the dispersed phase and the drop coalescence control region with lower holdup. The size of the maximum droplet in CDPSEC is estimated. It was found that, in the drop coalescence control region, droplets coalesce under the coalescence plate to produce the new large droplets, and the influence of drop coalescence is stronger than that of drop breakage. At the turning point, the new large droplets reach the maximum droplets and no larger droplets can be produced. From this point on, in the drop breakage control region, the droplets are so large that they break up into small droplets. Drop breakage becomes the main flow characteristic instead of drop coalescence. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8002792 [article] Mechanism analysis on the two-phase flow characteristics in coalescence-dispersion pulsed-sieve-plate extraction columns [texte imprimé] / Tang Xiaojin, Auteur ; Guangsheng Luo, Auteur ; Wang Jiading, Auteur . - 2009 . - p. 9724–9727. Chemistry engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9724–9727 Mots-clés : Mechanism  analysis  Flow  characteristics  Pulsed-Sieve Résumé : To investigate the influence of drop breakage and drop coalescence, a mechanism analysis of the liquid−liquid two-phase flow characteristics in the coalescence−dispersion pulsed-sieve-plate extraction column (CDPSEC) is performed. According to the experimental results, the operation of CDPSEC can be divided by a turning point into two regions: the drop breakage control region with higher holdup of the dispersed phase and the drop coalescence control region with lower holdup. The size of the maximum droplet in CDPSEC is estimated. It was found that, in the drop coalescence control region, droplets coalesce under the coalescence plate to produce the new large droplets, and the influence of drop coalescence is stronger than that of drop breakage. At the turning point, the new large droplets reach the maximum droplets and no larger droplets can be produced. From this point on, in the drop breakage control region, the droplets are so large that they break up into small droplets. Drop breakage becomes the main flow characteristic instead of drop coalescence. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8002792