Home About us Contact
|
Home About us Contact | ||
|
|
||
Cuprous Oxide (cuprous + oxide)
Selected AbstractsNonclassical Crystallization: Facile Synthesis and Shape Evolution of Single-Crystal Cuprous Oxide (Adv. Mater.ADVANCED MATERIALS, Issue 20 200920/2009) Lian Gao and co-workers discuss on p. 2068 the synergic effect of oriented attachment and ripening mechanism with face-selective additive adsorption for the formation of various morphologies of single-crystal Cu2O. The frontispiece shows an SEM image of self-assembled microcubic Cu2O mesocrystals, clearly revealing the rarely observed combination of a nonclassical-particle-based crystallization process and subsequent classical crystallization process. [source] Facile Synthesis and Shape Evolution of Single-Crystal Cuprous OxideADVANCED MATERIALS, Issue 20 2009Xudong Liang Various morphologies of single-crystal Cu2O such as cube, octahedron, {110} truncated octahedron, and microrhombic dodecahedron with {110} surfaces are prepared in high yield through a facile solution-based one-step reduction method in an alkaline H2O/ethanol/oleic acid system in the presence of d-(+)-glucose. The formation mechanism of these microcrystals has been clarified as the synergic effect of oriented attachment and ripening mechanism. [source] Electrochemical Crystallization of Cuprous Oxide with Systematic Shape Evolution,ADVANCED MATERIALS, Issue 19 2004J. Siegfried The growth of Cu2O crystals that are electrochemically deposited as micrometer-size crystals with systematically varying fractions of {100} and {111} faces is reported (the Figure depicts cubic crystals). The methodical and homogeneous shape evolution is achieved by tuning the degree of preferential adsorption of sodium dodecyl sulfate on the {111} faces of growing Cu2O crystals through pH variation. Scale bar: 1,,m. [source] Poly(3,4-ethylenedioxythiophene) Nanospheres Synthesized Using a Micelle Soft Template Associated with Cuprous OxideMACROMOLECULAR CHEMISTRY AND PHYSICS, Issue 11 2010Ying Zhu Abstract PEDOT nanospheres with an average diameter of about 100,nm were chemically synthesized using APS as the oxidant in the presence of SDBS and Cu2O, respectively. It was found that Cu2O is crucial to forming uniform PEDOT nanospheres because only granular PEDOT was obtained in the absence of Cu2O. It is proposed that the PEDOT nanospheres are self-assembled by a cooperation effect of SDBS as the micelle soft-template and Cu2O as the stabilizer of the spherical micelles. Additionally, the PEDOT nanospheres are soluble in some organic solvents, such as THF, DMF and DMSO, which is of benefit for fabrication of electronic and photonic devices. [source] Catalytic effects of copper oxides on the curing and degradation reactions of cyanate ester resinJOURNAL OF APPLIED POLYMER SCIENCE, Issue 1 2007Shinn-Gwo Hong Abstract The catalytic effect of copper oxides on the curing and degradation behaviors of the cyanate ester resin is studied with infrared spectroscopy, attenuated total reflection infrared spectroscopy (ATR), differential scanning calorimetry (DSC), and thermogravimetry analysis (TGA). The result of infrared spectroscopy and DSC analyses indicates that accelerated curing effects from different additives are in the order of zinc octoate > cuprous oxide > cupric oxide. The exothermic characteristics of the cyanate ester resin during cure are drastically affected by the presence of the copper oxides. In addition, it is obtained from TGA analyses that the thermal stability and degradation mechanism of cyanate ester resins are also significantly affected by the addition of copper oxides whereas the extent of degradation from the cupric oxide is greater than that from the cuprous oxide. These results are attributed to the differences in catalytic effects and surface areas of two copper oxides on the cyanate ester resin in contact during the thermal exposure. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: 442,448, 2007 [source] Ionization equilibrium and Mott transition in an excited semiconductor, phase diagramPHYSICA STATUS SOLIDI (C) - CURRENT TOPICS IN SOLID STATE PHYSICS, Issue 2 2009F. Richter Abstract The thermodynamic properties of an electron,hole plasma in a highly excited semiconductor are investigated. Special attention is directed to the influence of many-particle effects like screening, lowering of the ionization energy, and Mott effect on the ionization equilibrium. In particular, the Mott effect limits the region of existence of excitons and, therefore, of a possible Bose,Einstein condensate at low temperatures. Results for the chemical potential and the degree of ionization are presented for cuprous oxide. A possible window for the occurrence of a BEC of excitons taking into account the Mott effect is shown. (© 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source] Induction of resistance in cocoa against Crinipellis perniciosa and Verticillium dahliae by acibenzolar- S -methyl (ASM)PLANT PATHOLOGY, Issue 5 2002M. L. V. Resende The benzothiadiazole compound acibenzolar- S -methyl (ASM) was assessed as an inducer of resistance against Crinipellis perniciosa, agent of witches' broom, and Verticillium dahliae, agent of vascular wilt, both on cocoa. ASM induced a reduction in incidence of witches' broom of up to 84·5% when sprayed 30 days before inoculation on cocoa seedlings of cv. Catongo. ASM also induced a reduction in severity of Verticillium wilt to 55·4% on cv. Theobahia. For both pathosystems, effects of dose on disease were not clearly observed. The efficacy of the inducer increased with the interval between sprayings and the respective inoculations with the pathogens. In another experiment, the effect of ASM on the control of witches' broom on cocoa seedlings was compared with that of cuprous oxide and tebuconazole, all sprayed 15 days before inoculation. ASM reduced disease incidence by 60·1% compared with the inoculated control. ASM was superior to tebuconazole, and there was also a tendency for ASM to be better than cuprous oxide. To understand the mechanism of action of ASM as an inducer of resistance, alterations in the levels of total phenolics, polyphenol oxidases and peroxidases were evaluated 3, 15 and 30 days after spraying of seedlings of cv. Catongo. Enzyme activities from seedlings of cv. Theobahia were evaluated 30 days after spraying. On cv. Catongo, no significant differences in total phenolic content and polyphenol oxidase activity were detected after spraying. However, an increase in peroxidase activity was detected at all times of evaluation. On cv. Theobahia, significant increases in activities of peroxidase and polyphenol oxidase were detected, indicating that defence responses due to ASM were dependent on host genotype. [source] | ||||||||||