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41.
Organic nanocrystals of 1,3,5-triphenyl-2-pyrazoline(TPP) with a series of sizes were synthesized by reprecipitation method.The luminescence quantum efficiency of TPP nanocrystals increases from 24.2% for the nanocrystals with an average size of 300nm to 34.6% for those with an average size of 20nm.Surface capping by polyvinyl pyrrolidone(PVP) will improve the quantum efficiency of TPP nanocrystals.The size-dependence and capping-induced variation of the luminescence quantum efficiency was elucidated in viewpoint of aggregation quenching and the equilibrium between the TPP monomers and the aggregates in TPP nanocrystals. 相似文献
42.
A new method for injecting and driving fluids by means of a multi-port injection valve and syringe pumps in a micro-channel network is described. A structure composed of two micro-channels arranged as a cross is connected with capillary tubes to an external multi-port injection valve. The fluid flows are driven by pressure and the multi-port valve controls the direction of the flow within the different sections of the structure. The first position of the multi-port valve allows the preparation of the loading of the sample, which is pinched in the cross section of the two micro-channels. The second position allows the precise injection of nL volumes. No dead volume exists between injection and separation modes. The system can be used to prepare a sample plug by pressure in order to perform chromatography with a broad range of buffered or non-buffered solutions. Thanks to the insensitivity to the ionic strength of the sample, this injection method is useful for the injection of complex biological samples in microchip analysis. In order to demonstrate the feasibility of the method, different solutions of ionic or fluorescent molecules were injected and detected in a photoablated planar polymer device. 相似文献
43.
The components of the rock, the pigments, the gold foils and the adhesive of One Thousand Hand Buddha in Dazu stone sculptures, Chongqing, China, have been analyzed by X-ray diffraction (XRD), X-ray fluorescence (XRF), infrared spectroscopy (IR), energy dispersive X-ray analysis (EDX) and fiber optics reflectance spectroscopy (FORS). Furthermore, the weathering and degeneration of One Thousand Hand Buddha have been discussed and the protective methods have been provided. In this work some useful information to study on conservation of stone relics is given. 相似文献
44.
1INTRODUCTION Over the past decades,olefin oligomerization and polymerization based on late transition metal catalysts have been the most exciting developments in the area of organometallic chemistry and polymer science[1~3].In this broad context,neutral nickel(II)complexes have attracted much attention for their less sensitivity to protonic solvents and polar mon-mers.The most typical one is the SHOP-type cata-lyst[4~6],which contains an anionic[P,O]chelate ring and shows high activ… 相似文献
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表面修饰的二氧化锡纳米粒子的制备及微结构表征 总被引:11,自引:0,他引:11
采用胶体化学制得表面包覆有DBS的二氧化锡纳米粒子,并运用一系列手段对其微结构进行了表征。 相似文献
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离子交换法从发酵液中提取谷氨酰胺工艺研究 总被引:12,自引:0,他引:12
本文系统地研究了732树脂和D301树脂对发酵液中谷氨酰胺的静态和动态吸附性能及影响因素,并对洗脱条件进行了研究。实验结果表明,在阳离子交换柱上有效地降低了谷氨酰胺向谷氨酸的转化,在阴离子交换柱上谷氨酰胺和谷氨酸实现彻底分离,谷氨酰胺的总收率达56.6%。 相似文献
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In this paper, some existence theorems are obtained for periodic solutions of a nonlinear (q,p)-Laplacian dynamical system with impulsive effects by using the least action principle and mountain pass theorem. 相似文献