http://www.cnr.it/ontology/cnr/individuo/prodotto/ID196307
Alkyl chain grafting on silica-zirconia mixed oxides: preparation and characterization (Articolo in rivista)
- Type
- Label
- Alkyl chain grafting on silica-zirconia mixed oxides: preparation and characterization (Articolo in rivista) (literal)
- Anno
- 2010-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1039/b919896b (literal)
- Alternative label
Kailasam K., Mascotto S., Gross S., Maccato C., Müller K. (2010)
Alkyl chain grafting on silica-zirconia mixed oxides: preparation and characterization
in Journal of materials chemistry (Online); The Royal Society of Chemistry, Cambridge (Regno Unito)
(literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Kailasam K., Mascotto S., Gross S., Maccato C., Müller K. (literal)
- Pagina inizio
- Pagina fine
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
- Rivista
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
- Note
- ISI Web of Science (WOS) (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- Institut für Physikalische Chemie, UniversitEURat Stuttgart, Pfaffenwaldring
55, D-70569 Stuttgart, Germany. E-mail: klaus.mueller@ing.unitn.it; Fax:
+39 0461 281977; Tel: +39 0461 282439
CNR-ISTM, Dipartimento di Scienze Chimiche, Universit?a degli Studi di
Padova and INSTM, via Marzolo, 1, I-35131 Padova, Italy
Dipartimento, di, Ingegneria dei Materiali e Tecnologie Industriali,
Universit?a degli Studi di Trento, via Mesiano 77, I-38100 Trento, Italy
dINSTM, UdR Trento, Italy (literal)
- Titolo
- Alkyl chain grafting on silica-zirconia mixed oxides: preparation and characterization (literal)
- Abstract
- Silica-zirconia mixed oxide substrates were prepared and grafted with C18 alkyl chains using noctadecyltrichlorosilane.
Si : Zr molar ratios in the mixed oxide samples before and after alkyl chain
modification were determined by X-ray photoelectron spectroscopy (XPS). Nitrogen sorption
measurements provided the porous features of these materials. By means of solid-state 29Si nuclear
magnetic resonance (NMR) the amounts of the silanol groups present in the as-prepared, humidified
and grafted mixed oxide systems as well as the degree of cross-linking of the silanes were obtained. 13C
NMR spectroscopy was used to examine the conformational order of the n-octadecyl chains grafted on
the silica-zirconia mixed oxide substrates. Similar information was available from variable temperature
Fourier transform infrared (FTIR) investigations. Scanning electron microscopy (SEM) measurements
and energy dispersive X-ray (EDX) analyses yielded the morphological features of the solid substrates
and information about the distribution of the alkyl chains on the oxide surfaces. The annealing
temperature for the preparation of the mixed oxides and the elemental composition of the samples, i.e.
relative amount of the oxide components, were found to determine the surface properties and in turn
the alkyl chain assembly on the mixed oxide surfaces. FTIR and solid-state 13C NMR data gave
evidence for an unusual high conformational order of the grafted C18 alkyl chains in all samples,
irrespective of the low surface coverage, which exceeds comparable C18 and C30 grafted silica and metal
oxide systems. This finding was attributed to the formation of island structures with aggregated
octadecyl chains of high conformational order due to strong intermolecular interactions. Differences in
the conformational order of the various samples most likely arise from vertical polymerization which
varies with the actual sample. (literal)
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