Documents disponibles écrits par cet auteur

Fe3O4/poly(N-Isopropylacrylamide)/chitosan composite microspheres with multiresponsive properties / Pei Li in Industrial & engineering chemistry research, Vol. 47 N°20 (Octobre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N°20 (Octobre 2008) . - P. 7700-7706 Titre : Fe3O4/poly(N-Isopropylacrylamide)/chitosan composite microspheres with multiresponsive properties Type de document : texte imprimé Auteurs : Pei Li, Auteur ; Ai Mei Zhu, Auteur ; Qing Lin Liu, Auteur ; Qiu Gen Zhang, Auteur Année de publication : 2008 Article en page(s) : P. 7700-7706 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Multiresponsive  Fourier  transform  infrared  spectroscopy  (FTIR)  X-ray  diffraction  (XRD)  Thermogravimetric  analysis  (TGA)  Scanning  electron  microscopy  (SEM)  Transmission  electronic  microscopy  (TEM) Résumé : Multiresponsive composite microspheres were fabricated via emulsion polymerization in two steps. Fe3O4 nanoparticles modified by oleic acid (about 13 nm in diameter) were first prepared, and then they were embedded in biocompatible chitosan (CS) and N-isopropylacrylamide (NIPAm). Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and thermogravimetric analysis (TGA) examined the structure and morphology of the composite microspheres. Scanning electron microscopy (SEM) and transmission electronic microscopy (TEM) indicate the diameter of the composite microspheres to be about 400 nm. The magnetic, thermo, and pH-sensitive properties of the composite microspheres were investigated. Magnetic measurements with magnet and superconducting quantum interference device (SQUID) reveal that the composite microspheres are superparamagnetic. The electromagnetically induced heating shows that the composite microspheres could be heated up to 45 °C in an alternating electromagnetic field. The dynamic light scattering (DLS) results confirm the thermoresponsive and pH-responsive properties. It was found that the lower critical solution temperature (LCST) of the composite microspheres is 29 °C in water, and the LCST changed from 28 to 32 °C in the pH range from 4.7 to 7.4. These composite microspheres with the multiresponsive properties show great promise in biomedical applications. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800824q [article] Fe3O4/poly(N-Isopropylacrylamide)/chitosan composite microspheres with multiresponsive properties [texte imprimé] / Pei Li, Auteur ; Ai Mei Zhu, Auteur ; Qing Lin Liu, Auteur ; Qiu Gen Zhang, Auteur . - 2008 . - P. 7700-7706. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N°20 (Octobre 2008) . - P. 7700-7706 Mots-clés : Multiresponsive  Fourier  transform  infrared  spectroscopy  (FTIR)  X-ray  diffraction  (XRD)  Thermogravimetric  analysis  (TGA)  Scanning  electron  microscopy  (SEM)  Transmission  electronic  microscopy  (TEM) Résumé : Multiresponsive composite microspheres were fabricated via emulsion polymerization in two steps. Fe3O4 nanoparticles modified by oleic acid (about 13 nm in diameter) were first prepared, and then they were embedded in biocompatible chitosan (CS) and N-isopropylacrylamide (NIPAm). Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and thermogravimetric analysis (TGA) examined the structure and morphology of the composite microspheres. Scanning electron microscopy (SEM) and transmission electronic microscopy (TEM) indicate the diameter of the composite microspheres to be about 400 nm. The magnetic, thermo, and pH-sensitive properties of the composite microspheres were investigated. Magnetic measurements with magnet and superconducting quantum interference device (SQUID) reveal that the composite microspheres are superparamagnetic. The electromagnetically induced heating shows that the composite microspheres could be heated up to 45 °C in an alternating electromagnetic field. The dynamic light scattering (DLS) results confirm the thermoresponsive and pH-responsive properties. It was found that the lower critical solution temperature (LCST) of the composite microspheres is 29 °C in water, and the LCST changed from 28 to 32 °C in the pH range from 4.7 to 7.4. These composite microspheres with the multiresponsive properties show great promise in biomedical applications. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800824q