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Titanium nanorods

Battery applications Titanium containing y-Mn02 (TM) hollow spheres synthesis and catalytic activities in Li-air batteries [123] Orthorhombic LiMn02 nanorods for lithium ion battery application [124] Electrochemical characterization of MnOOH-carbon nanocomposite cathodes for metal—air batteries [125] Electrocatalytic activity of nanosized manganite [126]... [Pg.228]

The micro-emulsion medium was heated to 120-200 °C in a stainless steel autoclave. Micro-emulsions acidified with HNO3 produced monodispersed anatase nanoparticles while those acidified with HCl produced rutile nanorods. Titanium dioxide (Ti02) nanoparticles prepared this way have been shown to be active toward the photocatalytic oxidation of phenol [172]. [Pg.635]

Nad et al. [58] synthesised titanium dioxide (Ti02) nanoparticles of various different structures by the hydrolysis and condensation of TiCU in the water core of wa-ter/hexane/AOT micro emulsions of different to values at 8°C. The w was varied from 8.3 to 18 to obtain nanoparticles of sizes from 6 to 115 nm. They also observed that these were thermodynamically unstable orthorhombic crystals which on sintering at various different temperatures formed relatively stable nanorods. The variation of particle size with to is shown in Fig. 6.4. Nad etal. [58] also presented TEM pictures of Ti02 after sintering at various temperatures and showed that the particles changed from spherical (unsintered) to nanorods (Fig. 6.5). [Pg.189]

In another research report by Yoshikaw and his group, mesoporous anatase Ti02 nanopowder was synthesized at 130°C for 12 h (see Table 2) [106]. Titanium (IV) butoxide (Ci6H3604Ti) was mixed in a 1 1 molar ratio with acetylacetone (CH3-CO-CH2-CO-CH3) to slowdown the hydrolysis and the condensation reactions. 40 ruL of distilled water was added in the solution and stirred at room temperature for 5 min. The solution was put into a Teflon-hned stainless steel autoclave while stirring and heated at 130°C for 12 h. The final product was naturally cooled to room temperature and washed with 2-propanol and distilled water. This was then dried followed by drying at 100°C for 12 h. The synthesized sample had a narrow pore size distribution with an average pore diameter of about 3 nm. The specific surface area of the sample was about 193 m /g. Mesoporous anatase TiOz nanopowders showed higher photocatalytic activity than the nanorods, nanofibers and commercial 7702 nanoparticles. [Pg.23]

Ti02 nanopartides [10-12], NiO nanopartides [13] and various nanopartides of metal oxides [14] are formed in droplets or in a micellar environment. Cottam et al. reported a microfluidic synthesis of small nanorods of titanium oxide by fast mixing of an oleic add solution of tetraisopropoxytitanium (TTIP) with trimethylamine N-oxide dihydrate (TMAO) [15]. Both reaction solutions were mixed by a Y-shaped micro channel structure and conducted through a 40 cm microchannel with an internal channel width of 100 Jim. As a result, bunched assemblies of rod-like titanium dioxide were obtained. The length of the bundles was more than 100 nm and the diameter of the single rods was less than 10 nm. [Pg.783]

If the sputtered metallic species, on the other hand, exclusively interacts with one of the blocks of the copolymer, then it is also possible to use this method for producing arrays of nanorods. This was shown in the case of sputtering of titanium in the porous PS-Z -PVP(HABA) SMA templates in the presence of oxygen. The titanium dioxide so generated went exclusively to the cylindrical pores of the SMA templates. The thermal degradation of the polymer template then produced arrays of Ti02 nanorods on a silicon substrate. [Pg.2902]

The term upconversion describes an effect [1] related to the emission of anti-Stokes fluorescence in the visible spectral range following excitation of certain (doped) luminophores in the near infrared (NIR). It mainly occurs with rare-earth doped solids, but also with doped transition-metal systems and combinations of both [2, 3], and relies on the sequential absorption of two or more NIR photons by the dopants. Following its discovery [1] it has been extensively studied for bulk materials both theoretically and in context with uses in solid-state lasers, infrared quantum counters, lighting or displays, and physical sensors, for example [4, 5]. Substantial efforts also have been made to prepare nanoscale materials that show more efficient upconversion emission. Meanwhile, numerous protocols are available for making nanoparticles, nanorods, nanoplates, and nanotubes. These include thermal decomposition, co-precipitation, solvothermal synthesis, combustion, and sol-gel processes [6], synthesis in liquid-solid-solutions [7, 8], and ionothermal synthesis [9]. Nanocrystal materials include oxides of zirconium and titanium, the fluorides, oxides, phosphates, oxysulfates, and oxyfluoiides of the trivalent lanthanides (Ln ), and similar compounds that may additionally contain alkaline earth ions. Wang and Liu [6] have recently reviewed the theory of upconversion and the common materials and methods used. [Pg.30]

Figure 4.8 (a) Scanning electron micrograph of micro- and nanoscale hierarchically struc-tnred zinc oxide films at high magnification, (b) Photographs of water droplet shape on the zinc oxide/titanium dioxide nanorod film via dark storage and UV illumination. [Pg.101]

In the formation of lead zirconate titanate (PZT) nanorods, lead acetate, titanium isopropoxide, zirconium w-propoxide, glacial acetic acid, lactic acid, ethylene glycol, and glycerol were used for the PZT sols. The template membranes used for the growth of nanorods were track-etched hydrophilic polycarbonate (PC) with pore diameters of 100 and 200 mn and a thickness of 10 /xm. The PC membrane attached to Al cathode is placed... [Pg.327]

Titanium oxide nanostructures have versatile applications, for example, in photocatalysis, solar-energy conversion, sensors, and ductile ceramics. The synthesis of derivatives with all kinds of size and shape (spherical particles, nanotubes, and nanorods) has been described in numerous studies. Out of the three main titanium polymorphs (anatase, brookite, rutile), research so far has been centred on the synthesis of anatase nanoparticles. However, recently the generation of nanometer-sized rutile has received growing attention due to its promising potential as a photocatalyst and as an electrode material. [Pg.297]

Liu, Y, Chen, W, Yang, Y, Ong, J. L., Tsuru, K. et al. (2008), Novel fabrication of nanorod array structures on titanium and in vitro cell responses . Journal of Materiab Science. Materials in medicine, 19,2735-41. [Pg.390]


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See also in sourсe #XX -- [ Pg.32 ]




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