Zirconium oxide nanoparticles

Zheng, H. and Mathe, M. (2011) Enhanced conductivity and stability of composite membranes based on poly(2,5-benzimidazole) and zirconium oxide nanoparticles for fuel cells. J. 

Current CNT production techniques are being improved and novel synthesis routes explored to produce CNTs of ever improving quality, containing less and less impurities. From a quality point of view, growing SWCNT or MWCNT forests by CVD from catalyst-coated silicon wafers appears to be a very successful and promising way to proceed. But it remains to be seen whether this method is economically viable. An alternative original metal-free production route was recently reported, based on the use of zirconium oxide nanoparticles that can coax into CNTs. ... 

Letaief, S., Liu, Y., and Detellier, C. (2011) Zirconium oxide nanoparticles coated on sepiolite by sol-gel process their application as a solvent-free catalyst for condensation reactions. Can.. Chan., 89, 280-288. 

Dental Fillings. Nanoparticles of zirconium oxide (Zr02) are being used in the new UV-cured dental fillings. They give strength and are transparent to visible light, but are opaque to X-rays. Rare-earth oxides can also be used. 

The techniques used for preparing nanoparticles are similar to those used to prepare more conventional drug particles and include controlled precipitation, ball milling using glass or zirconium oxide pearls, and high-pressure homogenization. 

In a similar work, ultrasound radiation was used to prepare EU2O3 doped in zir-conia and yttrium-stabilized zirconium (YSZ) nanoparticles [83]. Europium oxide was also coated sonochemically on the surface of submicron spherical zirconia and YSZ, which were fabricated by wet chemical methods. Time decay measurements of the doped and coated materials were conducted using a pulsed laser source. Lifetimes < 1.1 ms radiative lifetime of the Eu+ ions were detected for the doped and coated as-prepared materials. When the doped and coated samples were an-... 

Names Cloisite Nanofrl Phthalocyanine copper-alpha- or betaform Titanium carbide, WS2 nanotubes Zinc oxide nanoparticles Zirconium carbide... 

Kaneko Y, Arake T (2012) Sol-gel preparation of highly water-dispersible silsesquioxane/ zirconium oxide hybrid nanoparticles. Int J Polym Sci 2012 1-6... 

In order to improve the performance (physicochemical characteristics in general as well as reactivity for catalysis or mechanical properties for ceramics) of prepared materials containing zirconium oxide, the most important characteristics requested are high surface area and phase stability of zirconia nanoparticles. 

The presence of coarse gold particles on the surface of modified zirconium oxide leads to its low catalytic activity the maximum CO conversion is only achieved at T = 450-500°C and is as low as 6%. Such a low degree of CO conversion is in all probability due to an inhomogeneous distribution of gold clusters over the support surface. So, modified zirconia is not favourable to gold nanoparticles stabilization. 

The 0-d nanoparticles can be nano-metal oxides (such as silica,1 titania,2 alumina3), nano-metal carbide,4 and polyhedral oligomeric silsesquioxanes (POSS),5 to name just a few the 1-d nanofibers can be carbon nanofiber,6 and carbon nanotubes (CNT),7 which could be single-wall CNTs (SWCNT) or multiwall CNTs (MWCNT) etc. the 2-d nano-layers include, but are not limited to, layered silicates,8 layered double hydroxides (LDH),9 layered zirconium phosphate,10 and layered titanates,11 etc. 3-d nano-networks are rarely used and thus examples are not provided here. 

Nanosized ceria-zirconia materials with improved thermal stability can be prepared by using the surfactant-assisted method. Structural refinements confirm that the nanocrystals contain structural microstrain and cationic lattice defects. Zirconium addition to ceria supresses the crystal sintering and imporves the thermal stability but leads to structure distortion. Both catalytic tests and CO-chemisorption show that Pd supported ceria-zirconia nanoparticles are active for CO oxidation. 

In addition to the above, preparation in w/o microemulsions of nanoparticles of various other types of compounds, viz. silica-coated iron oxide, Fe203-Ag nanocomposite, oxides of ytrium, erbium, neodymium, vanadium and cobalt, titanates of barium and lead, ferrites of barium, strontium, manganese, cobalt and zinc, oxide superconductors, aluminates, zirconium silicate, barium tungstate, phosphates of calcium, aluminium and zinc, carbonates of calcium and barium, sulphides of molybdenum and sodium, selenides of cadmium and silver etc. have been reported. Preparative sources and related elaboration can be found in [24]. 

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