Seifollahi Bazarjani, Mahdi ; Kleebe, Hans-Joachim ; Müller, Mathis M. ; Fasel, Claudia ; Baghaie Yazdi, Mehrdad ; Gurlo, Aleksander ; Riedel, Ralf (2011)
Nanoporous Silicon Oxycarbonitride Ceramics Derived from Polysilazanes In situ Modified with Nickel Nanoparticles.
In: Chemistry of Materials, 23 (18)
doi: 10.1021/cm200589n
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Ni–polysilazane precursors were synthesized from polysilazane and trans- [bis(2-aminoetanol-N,O)diacetato-nickel(II)]. The Ni–polysilazane precursors are superparamagnetic indicating formation of nanosized nickel particles (2−3 nm) confirmed by HRTEM as well. The as-obtained Ni–polysilazane precursors were thermolized at 700 °C and transformed to ceramic nanocomposites, manifesting a nanoporous structure, revealing a BET surface area of 215 m2 g–1, a micropore surface area of 205 m2 g–1, and a micropore volume of 0.113 cm3 g–1. Although Si–C–N–(O) ceramics derived from the native polysilazane are nonporous, the pronounced development of porosity in the Ni/Si–C–N–(O) system was attributed to (i) the stabilizing effect of carbosilane bonds, which prohibit the formation of macropores during thermolysis; (ii) the reduced barrier for heterogeneous pore nucleation as a result of in situ created nickel nanoparticles; and (iii) the reduced viscous flow of the pores due to the presence of nickel nanoparticles and turbostratic carbon. The formation of turbostratic carbon is due to the reactions catalyzed by nickel nanoparticles that result in graphene stacking as inferred from the STA–MS studies.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2011 |
| Autor(en): | Seifollahi Bazarjani, Mahdi ; Kleebe, Hans-Joachim ; Müller, Mathis M. ; Fasel, Claudia ; Baghaie Yazdi, Mehrdad ; Gurlo, Aleksander ; Riedel, Ralf |
| Art des Eintrags: | Bibliographie |
| Titel: | Nanoporous Silicon Oxycarbonitride Ceramics Derived from Polysilazanes In situ Modified with Nickel Nanoparticles |
| Sprache: | Englisch |
| Publikationsjahr: | 31 August 2011 |
| Verlag: | ACS |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Chemistry of Materials |
| Jahrgang/Volume einer Zeitschrift: | 23 |
| (Heft-)Nummer: | 18 |
| DOI: | 10.1021/cm200589n |
| Kurzbeschreibung (Abstract): | Ni–polysilazane precursors were synthesized from polysilazane and trans- [bis(2-aminoetanol-N,O)diacetato-nickel(II)]. The Ni–polysilazane precursors are superparamagnetic indicating formation of nanosized nickel particles (2−3 nm) confirmed by HRTEM as well. The as-obtained Ni–polysilazane precursors were thermolized at 700 °C and transformed to ceramic nanocomposites, manifesting a nanoporous structure, revealing a BET surface area of 215 m2 g–1, a micropore surface area of 205 m2 g–1, and a micropore volume of 0.113 cm3 g–1. Although Si–C–N–(O) ceramics derived from the native polysilazane are nonporous, the pronounced development of porosity in the Ni/Si–C–N–(O) system was attributed to (i) the stabilizing effect of carbosilane bonds, which prohibit the formation of macropores during thermolysis; (ii) the reduced barrier for heterogeneous pore nucleation as a result of in situ created nickel nanoparticles; and (iii) the reduced viscous flow of the pores due to the presence of nickel nanoparticles and turbostratic carbon. The formation of turbostratic carbon is due to the reactions catalyzed by nickel nanoparticles that result in graphene stacking as inferred from the STA–MS studies. |
| Freie Schlagworte: | Micropores, polymer-derived ceramics, polysilazane, nanocomposite, superparamagnetic, graphene stacking, nanosized nickel |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Disperse Feststoffe |
| Hinterlegungsdatum: | 04 Apr 2012 08:10 |
| Letzte Änderung: | 12 Aug 2021 12:04 |
| PPN: | |
| Sponsoren: | This work has been performed within the framework of the project “Thermoresistant ceramic membrane with integrated gas sensor for high temperature separation and detection of hydrogen and carbon monoxide” of the priority program “Adapting surfaces for hig, Fonds der Chemischen Industrie, Frankfurt, Germany: financial support, Alexander-von-Humboldt Foundation: financial support |
| Export: | |
| Suche nach Titel in: | TUfind oder in Google |
 |
Frage zum Eintrag |
Optionen (nur für Redakteure)
 |
Redaktionelle Details anzeigen |
Drucken
Impressum