electron microscopy
 

HOMEMETHODSINTERACTIONSDOWNLOADSCONTACT
RESEARCH: RECENT HIGHLIGHTSEXAMPLES


 

Nano Oxides

Flame-Made Nano Oxides

An access to oxide nanoparticles is the synthesis by oxidizing organic precurors in a flame reactor. Composite nanoparticles and coated nanoparticles can be obtained by co-precipitation of two oxides in a co-flow diffusion flame (for detailed information, see PTL) [1-3].


Silica-coated Fe2O3 nanoparticles.


Nano Oxides with Anisotropic Morphology

In various systems, it is of interest to synthesize oxides with a well-developed, anisotropic morphology since this may generate promising novel materials with unusual chemical and physical properties [4].

Monodispersed Iron Oxide Colloids



Hematite particles with a disk-like shape are accessible by hydrolysis of a hexanuclear iron-polyolate complex and subsequent hydrothermal treatment. Small plate-like crystallites are almost perfectly aligned in the a-b plane [5].
 


Molybdenum Oxide Nanorods


Fibrous MoO3 can easily be obtained from yellow molybdic acid (MoO3 . 2H2O) by hydrothermal treatment in acids, e.g., acidic acid. The product exclusively consists of MoO3 nanorods with a average diameter of 100-150 nm and a length of some micrometer [6].

[1] Flame-coating of Titania Particles with Silica
A. Teleki, S.E. Pratsinis, K. Wegner, R. Jossen, and F. Krumeich, J. Mater. Res. 20 (2005) 1336-1347
DOI

[2] In-Situ Coating of Flame-Made TiO2 Particles with Nanothin SiO2 Films
A. Teleki, M.C. Heine, F. Krumeich, M.K. Akhtar, and S.E. Pratsinis, Langmuir 24 (2008) 12553-12558 DOI

[3] Hermetically-Coated Superparamagnetic Fe2O3 Particles with SiO2 Nanofilms
A. Teleki, M. Suter, P. R. Kidambi,  O. Ergeneman, F. Krumeich, B.J. Nelson, and S. E. Pratsinis, Chem. Mater. 21 (2009) 2094-2100 DOI

[4] Oxidic Nanotubes and Nanorods – Anisotropic Modules for a Future Nanotechnology (Review)
G. R. Patzke, F. Krumeich, and R. Nesper, Angew. Chem. Int. Ed. 41 (2002) 2446-2461 DOI

[5] An Iron Polyolate Complex as Precursor for the Controlled Synthesis of Monodispersed Iron Oxide Colloids
M. Niederberger, F. Krumeich, K. Hegetschweiler, and R. Nesper, Chem. Mater. 14 (2002) 78-82 DOI

[6] Synthesis and Characterization of Novel Nanoscopic Molybdenum Oxide Fibers
M. Niederberger, F. Krumeich, H.-J. Muhr, M. Müller, and R. Nesper, J. Mater. Chem. 11 (2001) 1941-1945 DOI

 

ETH Zürich | ETH chemistry department | ETH inorganic chemistry

modified: 6 February, 2015 by F. Krumeich | © ETH Zürich and the authors