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In situ fabrication of surface modified lead monoxide nanopowder and its HDPE nanocomposite / Young Rang Uhm 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. 4478–4483 Titre : In situ fabrication of surface modified lead monoxide nanopowder and its HDPE nanocomposite Type de document : texte imprimé Auteurs : Young Rang Uhm, Auteur ; Jaewoo Kim, Auteur ; Sol Lee, Auteur Année de publication : 2011 Article en page(s) : pp. 4478–4483 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Nanopowder  Nanocomposite Résumé : Low density polyethylene (LDPE) coated lead monoxide (PbO) nanopowder was fabricated by using in situ high energy wet ball milling. Degrees of pulverization of wet milled PbO together with LDPE and cyclohexane were analyzed by means of PSA and SEM. PbO powder could be pulverized to 100 nm for 1 h milling while the surfaces of the powder particles were modified with LDPE simultaneously. Surface modification by elemental interdiffusion of PbO and carbon on the particulate boundary was confirmed by TEM/EDX. High density polyethylene (HDPE) nanocomposites were also prepared by dispersing micro- and nano-PbO/LDPE powders using a polymer melting mixer. Dispersion and adhesion of PbO/LDPE nanoparticles in or with the polymer matrix were homogeneous and strong respectively according to the SEM images as well as the FTIR spectra, while the HDPE nanocomposites show higher mechanical properties than those for micro-PbO powder dispersed ones. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie102300x [article] In situ fabrication of surface modified lead monoxide nanopowder and its HDPE nanocomposite [texte imprimé] / Young Rang Uhm, Auteur ; Jaewoo Kim, Auteur ; Sol Lee, Auteur . - 2011 . - pp. 4478–4483. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 8 (Avril 2011) . - pp. 4478–4483 Mots-clés : Nanopowder  Nanocomposite Résumé : Low density polyethylene (LDPE) coated lead monoxide (PbO) nanopowder was fabricated by using in situ high energy wet ball milling. Degrees of pulverization of wet milled PbO together with LDPE and cyclohexane were analyzed by means of PSA and SEM. PbO powder could be pulverized to 100 nm for 1 h milling while the surfaces of the powder particles were modified with LDPE simultaneously. Surface modification by elemental interdiffusion of PbO and carbon on the particulate boundary was confirmed by TEM/EDX. High density polyethylene (HDPE) nanocomposites were also prepared by dispersing micro- and nano-PbO/LDPE powders using a polymer melting mixer. Dispersion and adhesion of PbO/LDPE nanoparticles in or with the polymer matrix were homogeneous and strong respectively according to the SEM images as well as the FTIR spectra, while the HDPE nanocomposites show higher mechanical properties than those for micro-PbO powder dispersed ones. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie102300x

Separation of oxygen isotopic water by using a pressure-driven air gap membrane distillation / Jaewoo Kim in Industrial & engineering chemistry research, Vol. 48 N° 11 (Juin 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 11 (Juin 2009) . - pp. 5431–5438 Titre : Separation of oxygen isotopic water by using a pressure-driven air gap membrane distillation Type de document : texte imprimé Auteurs : Jaewoo Kim, Auteur ; Dae-Shik Chang, Auteur ; Yun-Young Choi, Auteur Année de publication : 2009 Article en page(s) : pp. 5431–5438 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Oxygen  isotopic  water  Air  gap  membrane  distillation  Multistage  MD  system  Pressure-driven  AGMD Résumé : Separation of oxygen isotopic water using a newly developed pressure-driven air gap membrane distillation (AGMD) process that is applicable to a multistage MD system was investigated. Pressure-driven (PD) AGMD is distinguished from a currently available AGMD by way of its permeation flux generation. It uses a peristaltic pump to generate the pressure gradient on the membrane interface. Permeation characteristics and isotopic selectivity of four different hydrophobic membranes were evaluated. Permeation fluxes under the various conditions were measured by weighing the collected membrane-permeated water. Permeation fluxes for PD AGMD were higher than those of AGMD as much as 4.2-fold whereas the degree of isotope selectivity was competitive. The oxygen isotopic concentrations of the samples were analyzed by measuring the isotopic ratio H218O/H216O using tunable diode laser absorption spectroscopy and isotopic ratio mass spectrometer. A multistage PD AGMD system was also successfully constructed and operated. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900277r [article] Separation of oxygen isotopic water by using a pressure-driven air gap membrane distillation [texte imprimé] / Jaewoo Kim, Auteur ; Dae-Shik Chang, Auteur ; Yun-Young Choi, Auteur . - 2009 . - pp. 5431–5438. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 11 (Juin 2009) . - pp. 5431–5438 Mots-clés : Oxygen  isotopic  water  Air  gap  membrane  distillation  Multistage  MD  system  Pressure-driven  AGMD Résumé : Separation of oxygen isotopic water using a newly developed pressure-driven air gap membrane distillation (AGMD) process that is applicable to a multistage MD system was investigated. Pressure-driven (PD) AGMD is distinguished from a currently available AGMD by way of its permeation flux generation. It uses a peristaltic pump to generate the pressure gradient on the membrane interface. Permeation characteristics and isotopic selectivity of four different hydrophobic membranes were evaluated. Permeation fluxes under the various conditions were measured by weighing the collected membrane-permeated water. Permeation fluxes for PD AGMD were higher than those of AGMD as much as 4.2-fold whereas the degree of isotope selectivity was competitive. The oxygen isotopic concentrations of the samples were analyzed by measuring the isotopic ratio H218O/H216O using tunable diode laser absorption spectroscopy and isotopic ratio mass spectrometer. A multistage PD AGMD system was also successfully constructed and operated. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900277r