sol–gel synthesis and morphological control of nanocrystalline tio2 via urea treatment

... Journal of Colloid and Interface Science 316 (2007) 160–167 www.elsevier.com/locate/jcis Sol–gel synthesis and morphological control of nanocrystalline TiO 2 via urea treatment Li-Heng ... outer diameter and the wall thickness of the tita- nia microtubules being 2–8 and 0.2–2 µm. We report in this study a novel anionic template-assisted sol–gel approach via...

Ngày tải lên: 20/03/2014, 13:07

... synthesis of one-dimensional nanostructure because of their high efficiency, controllability, simplicity and versatility. Hydrothermal techniques have been widely applied for the synthesis of ... where E g (a) is the effective band gap of QDs with radius of a, the band gap E g , Bohr exciton radius a B and Bohr exciton energy * y R are the specific parameters of bulk...

Ngày tải lên: 14/03/2014, 13:20

... electrical drives, use of various sensors and control algorithms is done to control the speed of the motor using suitable speed control methods. The basic block diagram of an electrical drive ... MATLAB Simulink and the effects of various parameters such as rotor and stator resistances and inductances were analysed. Also different control algorithms such as P, PI...

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Ngày tải lên: 03/01/2014, 19:44

... of lawlessness and 2) the focusing of all the forces of society on the development of self -control and temperance in the use of alcoholic beverages (Fosdick and Scott, p. ix). With repeal of ... when and where (e.g., legal drink- ing ages, hours of operation, type of establishment, presence or absence of food, types and amounts of beverages). e stated inten...

Ngày tải lên: 15/02/2014, 19:20

... leaflet clo- sure during nyctinasty, and that fluxes of K + and Cl – into and out of dorsal and ventral motor cells mediate the response. However, the rapidity of leaf closure in the dark (lag time ... been inferred from the effects of red and far-red light on the sur- face potential of roots and oat ( Avena) coleoptiles, where the lag between the production of Pfr an...

Ngày tải lên: 07/03/2014, 21:20

... results [5] show that the elasticity and strength of SiC nanowires are considerably greater than those of SiC whiskers and bulk SiC. A variety of methods on the synthesis of SiC nanowires have been developed, ... ratio of Si/C/O of the nanowires is about 3:2:2, which corresponds well to the standard SiC and SiO 2 . The small quantity of oxygen may come from the resident...

Ngày tải lên: 16/03/2014, 15:21

... Synthesis and turn-over of the replicative Cdc6 protein during the HeLa cell cycle Esther Biermann, Martina Baack, Sandra Kreitz and Rolf Knippers Department of Biology, Universita ¨ t ... ith the entry of yeast cells into S phase and increase again during t he following G1 phase with the synthesis of new Cdc6p. In contrast, the rapid S-phase-related elimination of Cdc6p t...

Ngày tải lên: 17/03/2014, 23:20

... 1(b). On the other hand, the treatment at 200 and 230 ◦ C resulted in the formation of tubular TiO 2 of 1 ␮m and 50 nm in length and diameter, respectively, as shown in Fig. 1(c) and (d). With increasing ... from the Ministry of Education, Culture, Sports, Science and Technology of Japan, and by Environmental Research and Technology Develop- ment Fund from the Ministry...

Ngày tải lên: 19/03/2014, 16:48

... enH 2q cations occupy interstrand regions 2 of the W O 4y chains and exhibit strong hydrogen bond 620 network to terminal and bridging oxo groups of the anionic chains of W O 4y . 620 1 Ž X . Crystal ... optical ma- wx terials and ceramics 1–4 . A promising synthetic route takes advantage of a low-temperature soft approach, hy- drothermal method, and the structure-directing fu...

Ngày tải lên: 19/03/2014, 16:48