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Micronization of p - aminosalicylic acid particles using high-gravity technique / Yu-Shao Chen in Industrial & engineering chemistry research, Vol. 49 N° 18 (Septembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 18 (Septembre 2010) . - pp. 8832–8840 Titre : Micronization of p - aminosalicylic acid particles using high-gravity technique Type de document : texte imprimé Auteurs : Yu-Shao Chen, Auteur ; Yao-Hsuan Wang, Auteur ; Hwai-Shen Liu, Auteur Année de publication : 2010 Article en page(s) : pp. 8832–8840 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Particles  High  Gravity  Technique Résumé : An antisolvent precipitation process was adopted in this study to prepare micrometer-sized p-aminosalicylic acid (PAS) particles using the high-gravity technique. The effects of operating variables on the particle size were investigated. With an increase in the dispersant concentration and disk diameter or a decrease in the drug (PAS) concentration, the particle size of PAS was reduced. In addition, a circular-tube distributor was more effective than a straight-tube distributor for micronization. On the other hand, the effect of the liquid flow rate in the range between 0.25 and 1 L/min was less significant. The high-pressure homogenization following the high-gravity precipitation would effectively reduce the agglomeration of the particles in the suspension to produce drug particles with a mean size of 1 μm. The enhancement of the dissolution rate was significant for the micronized drug particles. The results indicate that the high-gravity process is a promising approach for micronizing drug particles. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1007932 [article] Micronization of p - aminosalicylic acid particles using high-gravity technique [texte imprimé] / Yu-Shao Chen, Auteur ; Yao-Hsuan Wang, Auteur ; Hwai-Shen Liu, Auteur . - 2010 . - pp. 8832–8840. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 18 (Septembre 2010) . - pp. 8832–8840 Mots-clés : Particles  High  Gravity  Technique Résumé : An antisolvent precipitation process was adopted in this study to prepare micrometer-sized p-aminosalicylic acid (PAS) particles using the high-gravity technique. The effects of operating variables on the particle size were investigated. With an increase in the dispersant concentration and disk diameter or a decrease in the drug (PAS) concentration, the particle size of PAS was reduced. In addition, a circular-tube distributor was more effective than a straight-tube distributor for micronization. On the other hand, the effect of the liquid flow rate in the range between 0.25 and 1 L/min was less significant. The high-pressure homogenization following the high-gravity precipitation would effectively reduce the agglomeration of the particles in the suspension to produce drug particles with a mean size of 1 μm. The enhancement of the dissolution rate was significant for the micronized drug particles. The results indicate that the high-gravity process is a promising approach for micronizing drug particles. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1007932

Process intensification in the production of photocatalysts for solar hydrogen generation / Chia-Ying Chiang in Industrial & engineering chemistry research, Vol. 51 N° 14 (Avril 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 14 (Avril 2012) . - pp. 5207-5215 Titre : Process intensification in the production of photocatalysts for solar hydrogen generation Type de document : texte imprimé Auteurs : Chia-Ying Chiang, Auteur ; Ming-Hui Chang, Auteur ; Hwai-Shen Liu, Auteur Année de publication : 2012 Article en page(s) : pp. 5207-5215 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Photocatalysis  Catalyst  Hydrogen  production Résumé : CuO nanoparticles with diameter in the 20-30 nm range were prepared by a spinning disk reactor at the rate of 16.9 kg/day based on the process intensification concept The intense environment, that is, vigorous mixing and fast reaction at the same time, created within an initially crystal-free liquid film moving over the disk, generated very high supersaturation, and consequently small and fairly uniform crystals were formed via precipitation. These CuO nanoparticles were spin coated and sintered at 450 °C for 1 h to form a thin film electrode for use in a photoelectrochemical cell. The cell had a 1.20% solar to hydrogen conversion efficiency which is the highest among intrinsic CuO photoelectrochemical (PEC) cells reported to date in the literature. The bandgap of CuO films sintered at 450 °C for 1 h was 1.68 eV. The charge carrier density was 9.0 × 1020 cm―3 and the conduction and valence band edges were located at ―3.54 and -5.22 eV, respectively. Furthermore, a detailed comparison based on the preparation method, particle size, bandgap, porosity, and conductivity of the films in the CuO PEC cell literature is also reported in this study. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25783429 [article] Process intensification in the production of photocatalysts for solar hydrogen generation [texte imprimé] / Chia-Ying Chiang, Auteur ; Ming-Hui Chang, Auteur ; Hwai-Shen Liu, Auteur . - 2012 . - pp. 5207-5215. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 14 (Avril 2012) . - pp. 5207-5215 Mots-clés : Photocatalysis  Catalyst  Hydrogen  production Résumé : CuO nanoparticles with diameter in the 20-30 nm range were prepared by a spinning disk reactor at the rate of 16.9 kg/day based on the process intensification concept The intense environment, that is, vigorous mixing and fast reaction at the same time, created within an initially crystal-free liquid film moving over the disk, generated very high supersaturation, and consequently small and fairly uniform crystals were formed via precipitation. These CuO nanoparticles were spin coated and sintered at 450 °C for 1 h to form a thin film electrode for use in a photoelectrochemical cell. The cell had a 1.20% solar to hydrogen conversion efficiency which is the highest among intrinsic CuO photoelectrochemical (PEC) cells reported to date in the literature. The bandgap of CuO films sintered at 450 °C for 1 h was 1.68 eV. The charge carrier density was 9.0 × 1020 cm―3 and the conduction and valence band edges were located at ―3.54 and -5.22 eV, respectively. Furthermore, a detailed comparison based on the preparation method, particle size, bandgap, porosity, and conductivity of the films in the CuO PEC cell literature is also reported in this study. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25783429