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Iron - based nanoparticles for toxic organic degradation / Noah D. Meeks in Industrial & engineering chemistry research, Vol. 51 N° 28 (Juillet 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 28 (Juillet 2012) . - pp. 9571-9580 Titre : Iron - based nanoparticles for toxic organic degradation : Silica platform and green synthesis Type de document : texte imprimé Auteurs : Noah D. Meeks, Auteur ; Vasile Smuleac, Auteur ; Christopher Stevens, Auteur Année de publication : 2012 Article en page(s) : pp. 9571-9580 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Filler  Nanocomposite  Creep Résumé : This work intends to produce smart materials for use in advanced applications such as artificial load resisting tissues and articular implants by exploiting the good strength of carbon nanofibers (CNFs) and the excellent biocompatibility of polydimethylsiloxane (PDMS). In this work, a series of CNF/PDMS nanocomposites was fabricated by varying the method of preparation and nanofiber surface modification. Dynamic mechanical properties and creep behavior of these hybrid materials were studied in order to comprehend the reinforcing effect of the nanofibers on the polymer matrix. The improvement was overwhelming with 74% enhancement in storage modulus and 1100% reduction in creep compliance for just 4 phr of amine modified CNF. Property improvement in the nanocomposites is a function of the extent of nanofiber dispersion in the polymer matrix which was examined by High Resolution Transmission Electron Microscopy (HRTEM) and Field Emission Scanning Electron Microscopy (FESEM). ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26163294 [article] Iron - based nanoparticles for toxic organic degradation : Silica platform and green synthesis [texte imprimé] / Noah D. Meeks, Auteur ; Vasile Smuleac, Auteur ; Christopher Stevens, Auteur . - 2012 . - pp. 9571-9580. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 28 (Juillet 2012) . - pp. 9571-9580 Mots-clés : Filler  Nanocomposite  Creep Résumé : This work intends to produce smart materials for use in advanced applications such as artificial load resisting tissues and articular implants by exploiting the good strength of carbon nanofibers (CNFs) and the excellent biocompatibility of polydimethylsiloxane (PDMS). In this work, a series of CNF/PDMS nanocomposites was fabricated by varying the method of preparation and nanofiber surface modification. Dynamic mechanical properties and creep behavior of these hybrid materials were studied in order to comprehend the reinforcing effect of the nanofibers on the polymer matrix. The improvement was overwhelming with 74% enhancement in storage modulus and 1100% reduction in creep compliance for just 4 phr of amine modified CNF. Property improvement in the nanocomposites is a function of the extent of nanofiber dispersion in the polymer matrix which was examined by High Resolution Transmission Electron Microscopy (HRTEM) and Field Emission Scanning Electron Microscopy (FESEM). ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26163294

Sulfur - functionalization of porous silica particles and application to mercury vapor sorption / Noah D. Meeks in Industrial & engineering chemistry research, Vol. 49 N° 10 (Mai 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 10 (Mai 2010) . - pp. 4687–4693 Titre : Sulfur - functionalization of porous silica particles and application to mercury vapor sorption Type de document : texte imprimé Auteurs : Noah D. Meeks, Auteur ; Stephen Rankin, Auteur ; Dibakar Bhattacharyya, Auteur Année de publication : 2010 Article en page(s) : pp. 4687–4693 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Porous  Silica  Particles Résumé : Silanol (SiOH) groups on silica particle surfaces undergo silylation reactions with organosilane molecules to give functionalized particles, which are used in many applications. The determination of the extent of this reaction is important for proper design of functionalized materials, depending upon the application. Two types of porous silica particles (206 and 484 m2 g−1; 9.6 and 2.9 nm average pore diameter, respectively), and colloidal silica (Ludox) with a nonporous base particle of 22 nm diameter, were functionalized with sulfur-containing silanes, 3-mercaptopropyl trimethoxy silane (MPTMS), and bis[3-(triethoxysilyl) propyl]-tetrasulfide (S4). Maximum extent of functionalization was determined with S4 using Fourier transform infrared spectrometry (FTIR), thermogravimetric analysis (TGA), and total S analysis. For the two types of porous silica particles, FTIR indicated that 54 and 17% of the silanol groups were functionalized with S4, and TGA indicated that the functionalized particles were 12 and 11 mass % MPTMS, respectively. These results were independently confirmed with total sulfur analysis. Extents of functionalization were determined for varying the silane structure on the same silica particle. MPTMS reacted with 38% of functional groups, while S4 reacted with 17%; the mass % of silane is the same regardless of silane structure on the same silica particle. Characterization by DSC indicated a glass transition occurs in the silane layer of the S4-functionalized silica at about 85 °C, but not in the MPTMS functionalized particles. Finally, mercury sorption breakthrough curves indicate the pore characteristics of the S4 functionalized samples. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901580k [article] Sulfur - functionalization of porous silica particles and application to mercury vapor sorption [texte imprimé] / Noah D. Meeks, Auteur ; Stephen Rankin, Auteur ; Dibakar Bhattacharyya, Auteur . - 2010 . - pp. 4687–4693. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 10 (Mai 2010) . - pp. 4687–4693 Mots-clés : Porous  Silica  Particles Résumé : Silanol (SiOH) groups on silica particle surfaces undergo silylation reactions with organosilane molecules to give functionalized particles, which are used in many applications. The determination of the extent of this reaction is important for proper design of functionalized materials, depending upon the application. Two types of porous silica particles (206 and 484 m2 g−1; 9.6 and 2.9 nm average pore diameter, respectively), and colloidal silica (Ludox) with a nonporous base particle of 22 nm diameter, were functionalized with sulfur-containing silanes, 3-mercaptopropyl trimethoxy silane (MPTMS), and bis[3-(triethoxysilyl) propyl]-tetrasulfide (S4). Maximum extent of functionalization was determined with S4 using Fourier transform infrared spectrometry (FTIR), thermogravimetric analysis (TGA), and total S analysis. For the two types of porous silica particles, FTIR indicated that 54 and 17% of the silanol groups were functionalized with S4, and TGA indicated that the functionalized particles were 12 and 11 mass % MPTMS, respectively. These results were independently confirmed with total sulfur analysis. Extents of functionalization were determined for varying the silane structure on the same silica particle. MPTMS reacted with 38% of functional groups, while S4 reacted with 17%; the mass % of silane is the same regardless of silane structure on the same silica particle. Characterization by DSC indicated a glass transition occurs in the silane layer of the S4-functionalized silica at about 85 °C, but not in the MPTMS functionalized particles. Finally, mercury sorption breakthrough curves indicate the pore characteristics of the S4 functionalized samples. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901580k