High throughput methodology for continuous preparation of hydroxyapatite nanoparticles in a microporous tube-in-tube microchannel reactor / Qing Yang in Industrial & engineering chemistry research, Vol. 49 N° 1 (Janvier 2010)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 49 N° 1 (Janvier 2010) . - pp. 140–147 Titre : High throughput methodology for continuous preparation of hydroxyapatite nanoparticles in a microporous tube-in-tube microchannel reactor Type de document : texte imprimé Auteurs : Qing Yang, Auteur ; Jie-Xin Wang, Auteur ; Lei Shao, Auteur Année de publication : 2010 Article en page(s) : pp. 140–147 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Throughput--Methodology--Continuous--Hydroxyapatite--Nanoparticles--Microporous--Tube-in-Tube--Microchannel Reactor Résumé : A microporous tube-in-tube microchannel reactor (MTMCR) was successfully adopted to prepare hydroxyapatite (HAP) nanoparticles. The rodlike HAP nanoparticles with a mean size of 58 nm, a specific surface area of 49.32 m2/g, and a narrow size distribution were obtained in an MTMCR under a high throughput of 3 L/min. The mean particle size sharply decreased with increasing the continuous phase flow rate, while first decreased and subsequently increased with increasing the dispersed phase flow rate and the reactant concentration. The extension of the mixing distance led to the initial rapid and following slight decrease of the mean particle size. The size of HAP nanoparticles was also strongly dependent on the micropore size on the surface of inner tube. Small micropore size was beneficial for producing small particles. For comparison, HAP nanoparticles were also prepared in a stirred tank reactor (STR) and a T-junction microchannel reactor (TMCR), clearly exhibiting the advantages of the MTMCR over the STR and TMCR due to the achievement of uniformly smaller HAP nanoparticles and a high throughput for industrial production. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9005436 [article] High throughput methodology for continuous preparation of hydroxyapatite nanoparticles in a microporous tube-in-tube microchannel reactor [texte imprimé] / Qing Yang, Auteur ; Jie-Xin Wang, Auteur ; Lei Shao, Auteur . - 2010 . - pp. 140–147. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 1 (Janvier 2010) . - pp. 140–147 Mots-clés : Throughput--Methodology--Continuous--Hydroxyapatite--Nanoparticles--Microporous--Tube-in-Tube--Microchannel Reactor Résumé : A microporous tube-in-tube microchannel reactor (MTMCR) was successfully adopted to prepare hydroxyapatite (HAP) nanoparticles. The rodlike HAP nanoparticles with a mean size of 58 nm, a specific surface area of 49.32 m2/g, and a narrow size distribution were obtained in an MTMCR under a high throughput of 3 L/min. The mean particle size sharply decreased with increasing the continuous phase flow rate, while first decreased and subsequently increased with increasing the dispersed phase flow rate and the reactant concentration. The extension of the mixing distance led to the initial rapid and following slight decrease of the mean particle size. The size of HAP nanoparticles was also strongly dependent on the micropore size on the surface of inner tube. Small micropore size was beneficial for producing small particles. For comparison, HAP nanoparticles were also prepared in a stirred tank reactor (STR) and a T-junction microchannel reactor (TMCR), clearly exhibiting the advantages of the MTMCR over the STR and TMCR due to the achievement of uniformly smaller HAP nanoparticles and a high throughput for industrial production. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9005436

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Preparation of hydroxyaptite nanoparticles by using high - gravity reactive precipitation combined with hydrothermal method / Qing Yang in Industrial & engineering chemistry research, Vol. 49 N° 20 (Octobre 2010)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 49 N° 20 (Octobre 2010) . - pp. 9857–9863 Titre : Preparation of hydroxyaptite nanoparticles by using high - gravity reactive precipitation combined with hydrothermal method Type de document : texte imprimé Auteurs : Qing Yang, Auteur ; Jie-Xin Wang, Auteur ; Fen Guo, Auteur Année de publication : 2011 Article en page(s) : pp. 9857–9863 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Hydroxyaptite Nanoparticles Hydrothermal Résumé : Hydroxyapatite (HAP) nanoparticles were successfully prepared without using organic modifiers by the combination of high-gravity reactive precipitation and hydrothermal method. The influences of the high-gravity level, the total reactant flow rate, the reactant flow rate ratio, and the reactant concentration on the preparation of HAP nanoparticles were systematically explored. The results showed that a high-gravity level of 3808−7774 m/s2, a total reactant flow rate of 120−360 mL/min, a moderate reactant flow rate ratio of 0.6−1.67, and a low reactant concentration of 0.04−0.3 mol/L favored the formation of uniformly small HAP nanoparticles with a mean size of 55−110 nm and a narrow size distribution. The increase of the high-gravity level led to the initial rapid and following slight decrease of the mean particle size. The mean particle size first decreased and subsequently increased with increasing the total reactant flow rate, the reactant flow rate ratio, and the reactant concentration. The uniformity of HAP nanoparticles was mainly determined by the micromixing condition of reactants. It could be envisioned that high-gravity reactive precipitation combined with hydrothermal method would be promising in the commercial production of HAP nanoparticles. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1012757 [article] Preparation of hydroxyaptite nanoparticles by using high - gravity reactive precipitation combined with hydrothermal method [texte imprimé] / Qing Yang, Auteur ; Jie-Xin Wang, Auteur ; Fen Guo, Auteur . - 2011 . - pp. 9857–9863. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 20 (Octobre 2010) . - pp. 9857–9863 Mots-clés : Hydroxyaptite Nanoparticles Hydrothermal Résumé : Hydroxyapatite (HAP) nanoparticles were successfully prepared without using organic modifiers by the combination of high-gravity reactive precipitation and hydrothermal method. The influences of the high-gravity level, the total reactant flow rate, the reactant flow rate ratio, and the reactant concentration on the preparation of HAP nanoparticles were systematically explored. The results showed that a high-gravity level of 3808−7774 m/s2, a total reactant flow rate of 120−360 mL/min, a moderate reactant flow rate ratio of 0.6−1.67, and a low reactant concentration of 0.04−0.3 mol/L favored the formation of uniformly small HAP nanoparticles with a mean size of 55−110 nm and a narrow size distribution. The increase of the high-gravity level led to the initial rapid and following slight decrease of the mean particle size. The mean particle size first decreased and subsequently increased with increasing the total reactant flow rate, the reactant flow rate ratio, and the reactant concentration. The uniformity of HAP nanoparticles was mainly determined by the micromixing condition of reactants. It could be envisioned that high-gravity reactive precipitation combined with hydrothermal method would be promising in the commercial production of HAP nanoparticles. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1012757

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