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Encapsulation of SiO2 and TiO2 fine powders with poly(dl-lactic-co-glycolic acid) by rapid expansion of supercritical CO2 incorporated with ethanol cosolvent / Benjapol Kongsombut in Industrial & engineering chemistry research, Vol. 48 N° 24 (Décembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 11230–11235 Titre : Encapsulation of SiO2 and TiO2 fine powders with poly(dl-lactic-co-glycolic acid) by rapid expansion of supercritical CO2 incorporated with ethanol cosolvent Type de document : texte imprimé Auteurs : Benjapol Kongsombut, Auteur ; Atsushi sutsumi, Auteur ; Nara Suankaew, Auteur Année de publication : 2010 Article en page(s) : pp. 11230–11235 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Encapsulation--SiO2--TiO2--Powders--Poly(dl-lactic-co-glycolic  acid)--Rapid  Expansion--Supercritical--CO2  Incorporated--Ethanol  Cosolvent Résumé : Rapid expansion of supercritical carbon dioxide solution (RESS) for encapsulating core powders with a polymer shell was experimentally examined. Poly(dl-lactic-co-glycolic acid) polymer (PLGA) and 1.4-μm SiO2 as well as 70-nm TiO2 powders were employed as model encapsulating agent and core particles, respectively. A solution of PLGA in supercritical carbon dioxide (SC-CO2) was prepared incorporated with ethanol cosolvent. The RESS process was then performed by spraying the supercritical mixture through a capillary nozzle, leading to formation of well-dispersed PLGA nanoparticles. The precipitation of PLGA accompanying with its dispersion on core powder surface could be ascribed to the rigorous shear stress acting on the expanding flow of SC-CO2. The cumulative deposition of the precipitating PLGA could result in the uniform encapsulation of the SiO2 and TiO2 powders with 10 to 100 nm-thick PLGA layers in the form of both individual and agglomerating particles. The increased weight ratio of core particle to PLGA could lead to the more promoted encapsulation of core particles due to the higher contact among the core and precipitated PLGA particles after expansion. In comparison with large SiO2 powders, more rigorous agglomeration of encapsulated TiO2 powders would be attributed to their higher interparticle collections, which could also interfere with the expansion process. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900690v [article] Encapsulation of SiO2 and TiO2 fine powders with poly(dl-lactic-co-glycolic acid) by rapid expansion of supercritical CO2 incorporated with ethanol cosolvent [texte imprimé] / Benjapol Kongsombut, Auteur ; Atsushi sutsumi, Auteur ; Nara Suankaew, Auteur . - 2010 . - pp. 11230–11235. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 11230–11235 Mots-clés : Encapsulation--SiO2--TiO2--Powders--Poly(dl-lactic-co-glycolic  acid)--Rapid  Expansion--Supercritical--CO2  Incorporated--Ethanol  Cosolvent Résumé : Rapid expansion of supercritical carbon dioxide solution (RESS) for encapsulating core powders with a polymer shell was experimentally examined. Poly(dl-lactic-co-glycolic acid) polymer (PLGA) and 1.4-μm SiO2 as well as 70-nm TiO2 powders were employed as model encapsulating agent and core particles, respectively. A solution of PLGA in supercritical carbon dioxide (SC-CO2) was prepared incorporated with ethanol cosolvent. The RESS process was then performed by spraying the supercritical mixture through a capillary nozzle, leading to formation of well-dispersed PLGA nanoparticles. The precipitation of PLGA accompanying with its dispersion on core powder surface could be ascribed to the rigorous shear stress acting on the expanding flow of SC-CO2. The cumulative deposition of the precipitating PLGA could result in the uniform encapsulation of the SiO2 and TiO2 powders with 10 to 100 nm-thick PLGA layers in the form of both individual and agglomerating particles. The increased weight ratio of core particle to PLGA could lead to the more promoted encapsulation of core particles due to the higher contact among the core and precipitated PLGA particles after expansion. In comparison with large SiO2 powders, more rigorous agglomeration of encapsulated TiO2 powders would be attributed to their higher interparticle collections, which could also interfere with the expansion process. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900690v

Encapsulation of SiO2 and TiO2 fine powders with poly(dl-lactic-co-glycolic acid) by rapid expansion of supercritical CO2 incorporated with ethanol cosolvent / Benjapol Kongsombut in Industrial & engineering chemistry research, Vol. 48 N° 24 (Décembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 11230–11235 Titre : Encapsulation of SiO2 and TiO2 fine powders with poly(dl-lactic-co-glycolic acid) by rapid expansion of supercritical CO2 incorporated with ethanol cosolvent Type de document : texte imprimé Auteurs : Benjapol Kongsombut, Auteur ; Atsushi Tsutsumi, Auteur ; Nara Suankaew, Auteur Année de publication : 2010 Article en page(s) : pp. 11230–11235 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Supercritical  carbon  dioxide  solution  Polymer  shell  Large  SiO2  powders Résumé : Rapid expansion of supercritical carbon dioxide solution (RESS) for encapsulating core powders with a polymer shell was experimentally examined. Poly(dl-lactic-co-glycolic acid) polymer (PLGA) and 1.4-μm SiO2 as well as 70-nm TiO2 powders were employed as model encapsulating agent and core particles, respectively. A solution of PLGA in supercritical carbon dioxide (SC-CO2) was prepared incorporated with ethanol cosolvent. The RESS process was then performed by spraying the supercritical mixture through a capillary nozzle, leading to formation of well-dispersed PLGA nanoparticles. The precipitation of PLGA accompanying with its dispersion on core powder surface could be ascribed to the rigorous shear stress acting on the expanding flow of SC-CO2. The cumulative deposition of the precipitating PLGA could result in the uniform encapsulation of the SiO2 and TiO2 powders with 10 to 100 nm-thick PLGA layers in the form of both individual and agglomerating particles. The increased weight ratio of core particle to PLGA could lead to the more promoted encapsulation of core particles due to the higher contact among the core and precipitated PLGA particles after expansion. In comparison with large SiO2 powders, more rigorous agglomeration of encapsulated TiO2 powders would be attributed to their higher interparticle collections, which could also interfere with the expansion process. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900690v [article] Encapsulation of SiO2 and TiO2 fine powders with poly(dl-lactic-co-glycolic acid) by rapid expansion of supercritical CO2 incorporated with ethanol cosolvent [texte imprimé] / Benjapol Kongsombut, Auteur ; Atsushi Tsutsumi, Auteur ; Nara Suankaew, Auteur . - 2010 . - pp. 11230–11235. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 11230–11235 Mots-clés : Supercritical  carbon  dioxide  solution  Polymer  shell  Large  SiO2  powders Résumé : Rapid expansion of supercritical carbon dioxide solution (RESS) for encapsulating core powders with a polymer shell was experimentally examined. Poly(dl-lactic-co-glycolic acid) polymer (PLGA) and 1.4-μm SiO2 as well as 70-nm TiO2 powders were employed as model encapsulating agent and core particles, respectively. A solution of PLGA in supercritical carbon dioxide (SC-CO2) was prepared incorporated with ethanol cosolvent. The RESS process was then performed by spraying the supercritical mixture through a capillary nozzle, leading to formation of well-dispersed PLGA nanoparticles. The precipitation of PLGA accompanying with its dispersion on core powder surface could be ascribed to the rigorous shear stress acting on the expanding flow of SC-CO2. The cumulative deposition of the precipitating PLGA could result in the uniform encapsulation of the SiO2 and TiO2 powders with 10 to 100 nm-thick PLGA layers in the form of both individual and agglomerating particles. The increased weight ratio of core particle to PLGA could lead to the more promoted encapsulation of core particles due to the higher contact among the core and precipitated PLGA particles after expansion. In comparison with large SiO2 powders, more rigorous agglomeration of encapsulated TiO2 powders would be attributed to their higher interparticle collections, which could also interfere with the expansion process. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900690v