Search Results

You are looking at 1 - 10 of 328 items for :

Clear All

Abstract  

We studied the removal process of excessive free carbon in the nano-SiC powder by TG-DTA-MS, XRD and TEM three methods. The studies showed that the temperature of removing excessive free carbon in the nano-SiC powder should be about 750°C in air.

Restricted access

Various carbon dust particles

Studies on thermal behaviour

Authors: Sonja Eichholz, Martin Lerch, Michael Heck and Dirk Walter

modified forced-air burner. Diesel soot has been collected from the exhaust line of a diesel engine (type euro 2). Transmission electron microscopy (TEM) analysis was done using a transmission electron microscope H-600 (Hitachi, Japan

Restricted access
Authors: Y. Zhao, R. Frost, Veronika Vágvölgyi, E. Waclawik, J. Kristóf and Erzsébet Horváth

Abstract  

Yttrium doped boehmite nanofibres with varying yttrium content have been prepared at low temperatures using a hydrothermal treatment in the presence of poly(ethylene oxide) surfactant (PEO). The resultant nanofibres were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). TEM images showed the resulting nanostructures are predominantly nanofibres when Y-doping is less than 5%; in contrast Y-rich phases were formed when doping was around 10%. The doped boehmite and the subsequent nanofibres/nanotubes were analyzed by thermogravimetric and controlled rate thermal analysis methods. The boehmite nanofibres produced in this research thermally transform at higher temperatures than boehmite crystals and boehmite platelets. Boehmite nanofibres decompose at higher temperatures than non-hydrothermally treated boehmite.

Restricted access

Abstract  

Iron doped boehmite nanofibres with varying iron content have been prepared at low temperatures using a hydrothermal treatment in the presence of poly(ethylene oxide) surfactant. The resultant nanofibres were characterized by X-ray diffraction (XRD), and transmission electron microscopy (TEM). TEM images showed the resulting nanostructures are predominantly nanofibres when Fe doping is no more than 5%; in contrast nanosheets were formed if Fe doping was above 5%. For the 10% Fe doped boehmite, a mixed morphology of nanofibres and nanosheets were obtained. Nanotubes instead of nanofibres were observed in samples with 20% added iron. The Fe doped boehmite and the subsequent nanofibres/nanotubes were analysed by thermogravimetric and differential thermogravimetric methods. Boehmite nanofibres decompose at higher temperatures than non-hydrothermally treated boehmite and nano-sheets decompose at lower temperatures than the nanofibres.

Restricted access

equations [ 14 ]. and where L i is the length of slab, n i the number of the particles with the L i length or N i layers, and N i the number of layers in the particles i . On the basis of 7–9 TEM images

Restricted access

predetermined temperatures. Infrared analysis of the precursor and the ferrite was done on FTIR Shimadzu IR prestige21 series spectrophotometer. Transmission electron micrograph (TEM) and energy-dispersive X-ray analysis (EDX) were carried out on Philip’s-CM20

Restricted access

Nano-crystalline Mn0.3Ni0.3Zn0.4Fe2O4 obtained by novel fumarato-hydrazinate precursor method

Synthesis, characterization and studies of magnetic and electrical properties

Authors: U. B. Gawas, V. M. S. Verenkar and S. C. Mojumdar

supporting the formation of single-phase Mn 0.3 Ni 0.3 Zn 0.4 Fe 2 O 4 [ 42 , 43 ]. The TEM ( Fig. 4 ) shows the uniform distribution of particles with average particle size 10 nm confirming the nano-crystalline nature of “as synthesized” Mn 0.3 Ni 0.3 Zn 0

Restricted access

Doornebosch PG, Ferenschild FT, de Wilt JH, Dawson I, Tetteroo GW, de Graaf EJ: Treatment of recurrence after transanal endoscopic microsurgery (TEM) for T1 rectal cancer. Dis Colon Rectum 2010; 53: 1234–9 Graaf EJ

Restricted access
Authors: Monika Furko, Zsolt Fogarassy, Katalin Balázsi and Csaba Balázsi

structure and morphology of the prepared powders are thoroughly examined by SEM and TEM measurements, as well as Raman spectroscopy. 2. Experimental 2.1. Preparation of Multilayer Graphene (MLG

Open access

100CX TEM. The thermal stability of the pozzolans was estimated by means of a Setaram TG-DTA SETSYS 16/18. The pore size distribution of the pozzolans were determined by particle size analysis (Malvern Mastersizer Scirocco 2000), the

Restricted access