hydrothermal synthesis of na2ti6o13 and tio2 whiskers

... Journal of Crystal Growth 275 (2005) e2371–e2376 Hydrothermal synthesis of Na 2 Ti 6 O 13 and TiO 2 whiskers Dong-Seok Seo a , Hwan Kim a , Jong-Kook Lee b,Ã a School of Materials Science and Engineering, ... materials and high insulators, and TiO 2 whiskers can be applied for catalyst support and photocatalysts. Na 2 Ti 6 O 13 whiskers were easily synthesized by hy...

Ngày tải lên: 20/03/2014, 13:04

... Hydrothermal synthesis of TiO 2 nanofibres Fei-Bao Zhang, Hu-Lin Li ⁎ College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou ... 2006 Abstract TiO 2 nanofibres were synthesized by the hydrothermal method. The result shows that the growth of TiO 2 nanofibres is sensitive to the concentration of NaOH and the heating temperature. © ... NaOH solutions up to 8...

Ngày tải lên: 20/03/2014, 13:04

... USA d Advanced Materials Processing and Analysis Center, and Department of Mechanical, Materials, and Aerospace Engineering, University of Central Florida, Orlando, FL 32816, USA article info Article ... to the c-axis [25]. Seven modes of A 2u , and 3E u , are infrared (IR) active and two modes of A 2g , and B 1u ,are inactive [23]. Fig. 4 shows the Raman spectra of the...

Ngày tải lên: 19/03/2014, 16:47

... standard condition and (b) standard of WO 3 ·H 2 O on the basis of JCPDS data (JCPDS No. 18-1418). Fig. 3. Time evolutions of (a) the mean size of particle and COV and corres- ponding TEM images ... image of obtained particles in the standard condition and their size distribution evaluated from TEM observations. Fig. 2. XRD patterns of (a) particles obtained in the standar...

Ngày tải lên: 19/03/2014, 16:48

... speed and orientation of crystals. The size and structure for growth units depend on the hydrothermal reaction conditions. The addition Na 2 S and proper content of HCl produced different kinds of ... Results and discussion The morphologies of as-prepared WO 3 nanobelts were determined by SEM and TEM (Fig. 1). Fig. 1a and b shows the typical patterns of WO 3 nanobelts...

Ngày tải lên: 20/03/2014, 13:04

... Laboratory of Oil and Gas Fine Chemicals, College of Chemistry and Chemical Engineering, Xinjiang University, No. 14 Shengli Road, Urumqi 830046, China b College of Physics Science and Technology, ... applications of electrochromic devices, gas sensors and photocatalysts due to its relative narrower band gap (between 2.6 and 2.8 eV) [1–3]. Many research efforts have been dev...

Ngày tải lên: 20/03/2014, 13:04

... with diameter of about 100 nm. With the addition of 15 g K 2 SO 4 , the morphologies of synthesized WO 3 shown in Fig. 4b are the mixture of nanorods and nanoparticles. Nanorods and nanowires ... process and the growth of the WO 3 nanowires. With the addition of different inorganic salts, the compositions and the corresponding properties of the solution are different in...

Ngày tải lên: 20/03/2014, 13:04

... (SEM), and X-ray diffraction (XRD) observation of as-synthesized product revealed the formation of flower-like titanate with diameter of about 250–450 nm and BET surface area (S BET ) of 350.7 ... techniques, the hydrothermal method offers an inexpensive and environmentally friendly route and the ability to control chemical, homogeneity, purity, morphology, shape, and phase...

Ngày tải lên: 20/03/2014, 13:04

... However, there is no report on the synthesis of branched TiO 2 nanotubes. In this communication, we report for the first time, the synthesis, and characterization of Y-branched TiO 2 nanotube structures ... nanotubes Fig. 1. FESEM images of: (a) front view and (b) cross sectional of the Y-branched TiO 2 nanotube arrays prepared at 20 V and two different temperatures. Fig. 2. T...

Ngày tải lên: 20/03/2014, 13:08