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排序方式: 共有102条查询结果,搜索用时 937 毫秒
41.
铈(Ⅲ)-氨基酸-咪唑三元配合物的表征和循环伏安行为研究 总被引:7,自引:0,他引:7
合成了铈(Ⅲ)-色氨酸-咪唑和铈(Ⅲ)-苯丙氨酸-咪唑三元配合物,对配合物进行了元素分析、摩尔电导测试、热重-差热分析及红外光谱分析,确定了配合物的组成和成键特征,并用循环伏安法研究了铈(Ⅲ)离子、铈(Ⅲ)与氨基酸及咪唑混合溶液、铈(Ⅲ)二元及三元配合物在玻碳电极上的电化学行为。实验结果表明,在-0.10~1.10V(vs.SCE)电位扫描范围内,两种铈(Ⅲ)三元配合物显示了安全不可逆的电子迁移过 相似文献
42.
研究了红螺菌对Cu2 、Cr6 的吸附行为.结果表明,在pH 2.9,35℃微光厌氧条件下,菌体对40mg/L Cu2 、Cr6 最大吸附率分别为94%、83.2%.利用红外光谱、原子力成像等方法,对吸附Cu2 、Cr6 前后的红螺茵进行了研究.红外光谱表明,羟基峰位红移,吸附Cu2 后峰位移动为22cm-1,吸附Cr6 后移动28cm-1,其它峰没有漂移,并且峰形基本保持不变,说明吸附后菌体的主要成分及结构保持完整.原子力成像表明,吸附前胞外聚合物分散分布,吸附后胞外聚合物出现交联,形成一个新的二维网状结构,并且吸附Cu2 后的交联程度比吸附Cr6 高. 相似文献
43.
自动通用胶片判读仪是一种高智能化的精密光学测试设备,采用了计算机控制飞点扫描技术、精密光学测量技术、图象跟踪测量与信息处理技术。飞点管分辨率达4096×4096象元,通过光学系统胶片上获得6.55μm高分辨率,飞点扫描方式灵活多样且可随意控制,通用于目前我国靶场所有的电影经纬仪和高速摄影机35mm胶片的数据判读。具有自动判读和半自动判读两种工作模式,自动判读的速度为5帧/秒,自动判读的精度为σ=±0.011mm,半自动判读的精度为σ=±0.009mm,测量数据可以记录、打印和显示。 相似文献
44.
A novel and facile method has been developed for the fabrication of Pt–carbon fiber (Pt/CF) disk ultramicroelectrode (DUME).
This method, which might be a simple and economical shortcut to get access to Pt/CF DUME, is based upon having metal Pt electroplated
on CF DUME. In this paper, an electrode prepared through the new way was characterized by cyclic voltammetry and applied as
probe for scanning electrochemical microscope. 相似文献
45.
A new 4‐deacety‐1,7,9‐trideoxy‐10‐oxopaclitaxel (compound 1) was prepared in 21 steps via sinenxan A, a biosynthetic taxane. The biological evaluation in vitro against human cancer lines showed compound 1 to be devoid of cytotoxicity. 相似文献
46.
47.
Cheng Jin Yongchao Zhao Huixia Wang Kunhua Lin Qinjian Yin 《Colloid and polymer science》2012,290(8):741-749
A new strategy based on ionic self-assembly technology was provided for design of solid and hollow nanospheres. Solid azocomplex nanospheres were constructed by ionic self-assembly of statistical ionomer and metanil yellow. The structure of azocomplex and self-assembly behaviors were examined by a variety of techniques including 1H-NMR, 13C-NMR, DSC, FTIR, UV–vis, TEM, and elemental analysis. The azocomplex was subjected to solvent-induced self-assembly to construct a variety of morphologies. Solid polymeric nanospheres with the sizes of 50~100?nm in diameter were formed in aqueous solution. High-resolution transmission electron microscopes and X-ray energy dispersion spectrometer were used to study the morphology and composition of the solid nanospheres. The spherical and ordered structure was destroyed in DMF, and converted into membrane structure. Polymeric hollow nanospheres with azobenzene chromophores were formed in DMF/H2O mixed solvent, with 62.5% H2O in mass. The size of these hollow nanospheres was 50~120?nm in diameter. 相似文献
48.
The LiMnPO4/C composite material with ordered olivine structure was synthesized in 1:1(v/v) enthanol–water mixed solvent in the presence of cetyltrimethylammonium bromide (CTAB) at 240 °C. Rod-like particle morphology of the resulting LiMnPO4/C powder with a uniform particle dimension of 150 × 600 nm was observed by using scanning electron microscope and the amount of carbon coated on the particle surface was evaluated as 2.2wt% by thermogravimetric analysis, which is reported for the first time to date for LiMnPO4/C composite. The measurement of the electrochemical performance of the material used in rechargeable lithium ion battery shows that the LiMnPO4/C sample delivers an initial discharge capacity of 126.5 mA h g?1 at a constant current of 0.01 C, which is 74% of the theoretical value of 170 mA h g?1. The electrode shows good rated discharge capability and high electrochemical reversibility when compared with the reported results, which is verified further by the evaluation of the Li ion diffusion coefficient of 5.056×10?14 cm2/s in LiMnPO4/C. 相似文献
49.
研究了Nd^3+和Er^3+分别与色氨酸,苯丙氨酸,缬氨酸,咪唑和苯并咪唑配体所组成的配合物,在95%乙醇中的f-f超灵敏跃迁吸收光谱。计算超灵敏峰的振子强度P,电子云伸展比β共价参数δ和键合参数。探讨了配合物的共价性。 相似文献
50.