Documents disponibles écrits par cet auteur

Behavior of inorganic nanoparticles in silver polymer electrolytes and their effects on silver ion activity for facilitated olefin transport / Sang Wook Kang in Industrial & engineering chemistry research, Vol. 48 N° 18 (Septembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 18 (Septembre 2009) . - pp. 8650–8654 Titre : Behavior of inorganic nanoparticles in silver polymer electrolytes and their effects on silver ion activity for facilitated olefin transport Type de document : texte imprimé Auteurs : Sang Wook Kang, Auteur ; Wanki Bae, Auteur ; Jong Hak Kim, Auteur Année de publication : 2010 Article en page(s) : pp. 8650–8654 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : TiO2  nanoparticles  Al2O3  nanoparticles  Silver  polymer  electrolytes Résumé : TiO2 and Al2O3 nanoparticles having different chemical properties were introduced into a poly(2-ethyl-2-oxazoline) (POZ) membrane to make inactive AgNO3 chemically more active in olefin complexation, resulting in facilitated olefin transport. The interaction schemes were particularly emphasized to understand the activation of AgNO3 for facilitated olefin transport. The separation performances were similar in both cases, consistent with similar changes in the binding energy of silver ions and the relative concentrations of the added ionic species. However, the bond strength of C═O in POZ increased with TiO2 whereas it decreased with Al2O3, as confirmed by FT-IR spectroscopy. This difference was explained in terms of the difference in the zeta potential: TiO2 and Al2O3 displayed zeta potentials of −18 and +6.5 mV at pH 4, respectively. On the basis of these, the following interaction scheme was proposed: the TiO2 nanoparticles predominantly interact with silver cations, whereas the Al2O3 nanoparticles preferentially interact with NO3−. As a result, both nanoparticles help to loosen the bond strength between Ag+ and NO3−, resulting in the activation of the silver cations in olefin complexation; consequently, olefin transport is facilitated, which results in improved separation performance in the separation of propylene/propane mixtures. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9000103 [article] Behavior of inorganic nanoparticles in silver polymer electrolytes and their effects on silver ion activity for facilitated olefin transport [texte imprimé] / Sang Wook Kang, Auteur ; Wanki Bae, Auteur ; Jong Hak Kim, Auteur . - 2010 . - pp. 8650–8654. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 18 (Septembre 2009) . - pp. 8650–8654 Mots-clés : TiO2  nanoparticles  Al2O3  nanoparticles  Silver  polymer  electrolytes Résumé : TiO2 and Al2O3 nanoparticles having different chemical properties were introduced into a poly(2-ethyl-2-oxazoline) (POZ) membrane to make inactive AgNO3 chemically more active in olefin complexation, resulting in facilitated olefin transport. The interaction schemes were particularly emphasized to understand the activation of AgNO3 for facilitated olefin transport. The separation performances were similar in both cases, consistent with similar changes in the binding energy of silver ions and the relative concentrations of the added ionic species. However, the bond strength of C═O in POZ increased with TiO2 whereas it decreased with Al2O3, as confirmed by FT-IR spectroscopy. This difference was explained in terms of the difference in the zeta potential: TiO2 and Al2O3 displayed zeta potentials of −18 and +6.5 mV at pH 4, respectively. On the basis of these, the following interaction scheme was proposed: the TiO2 nanoparticles predominantly interact with silver cations, whereas the Al2O3 nanoparticles preferentially interact with NO3−. As a result, both nanoparticles help to loosen the bond strength between Ag+ and NO3−, resulting in the activation of the silver cations in olefin complexation; consequently, olefin transport is facilitated, which results in improved separation performance in the separation of propylene/propane mixtures. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9000103

Facile synthesis of copper nanoparticles by ionic liquids and its application to facilitated olefin transport membranes / Jongho Kim in Industrial & engineering chemistry research, Vol. 48 N° 15 (Août 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 15 (Août 2009) . - pp. 7437–7441 Titre : Facile synthesis of copper nanoparticles by ionic liquids and its application to facilitated olefin transport membranes Type de document : texte imprimé Auteurs : Jongho Kim, Auteur ; Sang Wook Kang, Auteur ; Sung Hyun Mun, Auteur Année de publication : 2009 Article en page(s) : pp. 7437–7441 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Copper  nanoparticle  Ionic  liquids  Olefin  carrier Résumé : We suggest a facile synthesis method of copper nanoparticles, and this process is facilitated by 1-butyl-3-methylimidazolium tetrafluoroborate (BMIM+BF4−) which was employed to dissociate the copper metal into nanosized copper particles. The formation of copper nanoparticles was confirmed by UV−vis spectrum analysis and transmission electron microscope (TEM) imaging, and the interaction of BMIM+BF4− with the copper metal was confirmed by Fourier transform (FT)-Raman spectroscopy. Moreover, the fabricated copper nanoparticles could be used as an olefin carrier for propylene/propane separation. While BMIM+BF4−/Cu (stirred for 0 h) nanocomposite showed a selectivity of 1.1 and a permeance of 4.7 GPU, the separation performance of the BMIM+BF4−/Cu (stirred for 24 h) nanocomposite membrane was significantly improved; the selectivity was found to be 5.2 with a mixed gas permeance of 4.0 GPU. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900150c [article] Facile synthesis of copper nanoparticles by ionic liquids and its application to facilitated olefin transport membranes [texte imprimé] / Jongho Kim, Auteur ; Sang Wook Kang, Auteur ; Sung Hyun Mun, Auteur . - 2009 . - pp. 7437–7441. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 15 (Août 2009) . - pp. 7437–7441 Mots-clés : Copper  nanoparticle  Ionic  liquids  Olefin  carrier Résumé : We suggest a facile synthesis method of copper nanoparticles, and this process is facilitated by 1-butyl-3-methylimidazolium tetrafluoroborate (BMIM+BF4−) which was employed to dissociate the copper metal into nanosized copper particles. The formation of copper nanoparticles was confirmed by UV−vis spectrum analysis and transmission electron microscope (TEM) imaging, and the interaction of BMIM+BF4− with the copper metal was confirmed by Fourier transform (FT)-Raman spectroscopy. Moreover, the fabricated copper nanoparticles could be used as an olefin carrier for propylene/propane separation. While BMIM+BF4−/Cu (stirred for 0 h) nanocomposite showed a selectivity of 1.1 and a permeance of 4.7 GPU, the separation performance of the BMIM+BF4−/Cu (stirred for 24 h) nanocomposite membrane was significantly improved; the selectivity was found to be 5.2 with a mixed gas permeance of 4.0 GPU. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900150c

Nanoassembly of block copolymer micelle and graphene oxide to multilayer coatings / Jinkee Hong in Industrial & engineering chemistry research, Vol. 50 N° 6 (Mars 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 6 (Mars 2011) . - pp. 3095–3099 Titre : Nanoassembly of block copolymer micelle and graphene oxide to multilayer coatings Type de document : texte imprimé Auteurs : Jinkee Hong, Auteur ; Yong Soo Kang, Auteur ; Sang Wook Kang, Auteur Année de publication : 2011 Article en page(s) : pp. 3095–3099 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Copolymer  Oxide Résumé : We report on the preparation and characterization of multidimensional nano-objects nanoassembly in film surface coatings. 2D reduced graphene oxide (rGO) sheets are assembled with 0D block copolymer micelles (BCM)s through electrostatic layer-by-layer assembly. The BCM/rGO paired nanoassembly surface coatings were formed via sequential adsorption of polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) aqueous solutionsand modified rGO sheets with carboxylic acids groups, and the process was monitored by UV−vis spectroscopy. SEM and AFM were used to investigate surface morphology and the growth of multilayer coatings as a function of the number of bilayers. In addition, encapsulated hydrophobic fluorescence organic dyes were imaged via confocal microscopy. Evenly distributed BCMs on coatings were successfully obtained. We expect that this demonstration offers a new route to introduce nanoassembly of two different dimensional-shaped nano-objects in surface coatings for many industrial uses and makes building more complex, functional multicomponent, and multidimensional structures possible for use in nano-objects incorporated various multicoating applications. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1022282 [article] Nanoassembly of block copolymer micelle and graphene oxide to multilayer coatings [texte imprimé] / Jinkee Hong, Auteur ; Yong Soo Kang, Auteur ; Sang Wook Kang, Auteur . - 2011 . - pp. 3095–3099. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 6 (Mars 2011) . - pp. 3095–3099 Mots-clés : Copolymer  Oxide Résumé : We report on the preparation and characterization of multidimensional nano-objects nanoassembly in film surface coatings. 2D reduced graphene oxide (rGO) sheets are assembled with 0D block copolymer micelles (BCM)s through electrostatic layer-by-layer assembly. The BCM/rGO paired nanoassembly surface coatings were formed via sequential adsorption of polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) aqueous solutionsand modified rGO sheets with carboxylic acids groups, and the process was monitored by UV−vis spectroscopy. SEM and AFM were used to investigate surface morphology and the growth of multilayer coatings as a function of the number of bilayers. In addition, encapsulated hydrophobic fluorescence organic dyes were imaged via confocal microscopy. Evenly distributed BCMs on coatings were successfully obtained. We expect that this demonstration offers a new route to introduce nanoassembly of two different dimensional-shaped nano-objects in surface coatings for many industrial uses and makes building more complex, functional multicomponent, and multidimensional structures possible for use in nano-objects incorporated various multicoating applications. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1022282

One - pot preparation of titania - nanoparticles through hairy and crew - cut type micelle templates / Jinkee Hong in Industrial & engineering chemistry research, Vol. 49 N° 19 (Octobre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 19 (Octobre 2010) . - pp. 9124–9127 Titre : One - pot preparation of titania - nanoparticles through hairy and crew - cut type micelle templates Type de document : texte imprimé Auteurs : Jinkee Hong, Auteur ; Sang Wook Kang, Auteur Année de publication : 2010 Article en page(s) : pp. 9124–9127 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Nanoparticles  Titanium  oxide Résumé : A facile approach successfully produced block copolymer micelle templated titanium oxide nanoparticles via electrostatic interaction based adsorption between cationic polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) and negatively charged titania precursor, titanium(IV) bis(ammonium lactate)dihydroxide (TALH) complexes in aqueous solution. Both hairy and crew-cut types of block copolymer micelles were examined as a particle scaffold. The diameter of the titiania nanoparticles prepared were from 10 to 70 nm depending on the molecular weight or type of block copolymer micelle template. Also, mass production of titania nanoparticles on the Si-wafer was shown by a one-pot process. The size morphologies and distributions shown were confirmed by field emission scanning electron microscopy (FESEM). The results suggest that the versatile and environmentally friendly technique to manufacture titania nanoparticles, which could be easily widened to prepare electrostatic interaction based organic/inorganic complexes with further applications. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1010838 [article] One - pot preparation of titania - nanoparticles through hairy and crew - cut type micelle templates [texte imprimé] / Jinkee Hong, Auteur ; Sang Wook Kang, Auteur . - 2010 . - pp. 9124–9127. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 19 (Octobre 2010) . - pp. 9124–9127 Mots-clés : Nanoparticles  Titanium  oxide Résumé : A facile approach successfully produced block copolymer micelle templated titanium oxide nanoparticles via electrostatic interaction based adsorption between cationic polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) and negatively charged titania precursor, titanium(IV) bis(ammonium lactate)dihydroxide (TALH) complexes in aqueous solution. Both hairy and crew-cut types of block copolymer micelles were examined as a particle scaffold. The diameter of the titiania nanoparticles prepared were from 10 to 70 nm depending on the molecular weight or type of block copolymer micelle template. Also, mass production of titania nanoparticles on the Si-wafer was shown by a one-pot process. The size morphologies and distributions shown were confirmed by field emission scanning electron microscopy (FESEM). The results suggest that the versatile and environmentally friendly technique to manufacture titania nanoparticles, which could be easily widened to prepare electrostatic interaction based organic/inorganic complexes with further applications. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1010838