排序方式: 共有58条查询结果,搜索用时 203 毫秒
41.
新型CNT/nano-TiO_2复合膜电极的制备及其异相电催化性能 总被引:1,自引:1,他引:0
采用溶胶-凝胶法制备了碳纳米管/纳米TiO2(CNT/nano-TiO2)复合溶胶,通过提拉法将复合溶胶涂覆在Ti基体上制得CNT/nano-TiO2复合膜修饰电极(C电极),其电化学性能经循环伏安、计时库仑、交流阻抗谱(EIS)等方法研究.研究结果表明,CNT可阻碍nano-TiO2粒子团聚.在循环伏安图中,C电极的氧化还原峰电流比nano-TiO2膜修饰电极(P 电极)的高出两倍多.通过对草酸溶液的异相电催化反应进一步证明C电极比P电极具有更高的电催化活性,而且对双氧水也有很强的异相电催化还原能力. 相似文献
42.
Turing-Hopf bifurcation in the reaction-diffusion system with delay and application to a diffusive predator-prey model 下载免费PDF全文
The interactions of diffusion-driven Turing instability and delay-induced Hopf bifurcation always give rise to rich spatiotemporal dynamics. In this paper, we first derive the algorithm for the normal forms associated with the Turing-Hopf bifurcation in the reaction-diffusion system with delay, which can be used to investigate the spatiotemporal dynamical classification near the Turing-Hopf bifurcation point in the parameter plane. Then, we consider a diffusive predator-prey model with weak Allee effect and delay. Through investigating the dynamics of the corresponding normal form of Turing-Hopf bifurcation induced by diffusion and delay, the spatiotemporal dynamics near this bifurcation point can be divided into six categories. Especially, stable spatially homogeneous/inhomogeneous periodic solutions and steady states, coexistence of two stable spatially inhomogeneous periodic solutions, coexistence of two stable spaially inhomogeneous steady states and the transition from one kind of spatiotemporal patterns to another are found. 相似文献
43.
单质碘对水溶性CdTe量子点的荧光猝灭研究 总被引:3,自引:3,他引:0
合成了不同尺寸的、巯基丙酸和半胱氨酸修饰的水溶性CdTe量子点,并研究了I2与CdTe量子点的相互作用,实验发现I2能够明显猝灭CdTe量子点的荧光,且猝灭程度与量子点的修饰剂有关,没有表现出明显的尺寸依赖效应。 相似文献
44.
通过水热法得到了2个配位聚合物{[Cd(L)(oba)]·3.5H2O}n(1)和{[Cd(L)2](p-bdc)}n(2)(L=4,4’-二(1-咪唑基)苯砜,H2oba=4,4’-联苯醚二甲酸,p-H2bdc=对苯二甲酸),对它们进行了元素分析、红外光谱分析,并利用X射线衍射测定了它们的单晶结构。晶体结构分析表明,配合物1具有四连接二重穿插的三维网络结构,其拓扑为{65·8}。配合物2具有四连接的二维结构,其拓扑为{44·62}。此外,在室温下对2个配合物进行了荧光分析。 相似文献
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46.
《Polyhedron》1999,18(8-9):1335-1338
The crystal structure of the simple 1:1 complex of Ag(I) with hydrotris(3,5-dimethylpyrazolyl)borate (TpMe,Me) has been shown to be an asymmetric dimer, in which each TpMe,Me ligand bridges both metals by coordinating two pyrazolyl donors to one Ag(I) centre and one to the other, such that to a first approximation one Ag(I) is four coordinate and the other is two coordinate. However two of the pyrazolyl donors around the `four-coordinate' metal centres are also involved in weak, asymmetric bridging interactions with the `two-coordinate' metal centres. This is in contrast to the structure of the Cu(I) analogue [Cu2(TpMe,Me)2] in which both Cu(I) ions are three coordinate. 相似文献
47.
Zheng Yuchuan Wang ·Shu Li Ruifeng Pan Le Li Liangqing Qi Zhaopeng Li Changjiang 《Research on Chemical Intermediates》2021,47(6):2421-2431
Research on Chemical Intermediates - Water-soluble fluorescent carbon dots (C-dots) were prepared by a hydrothermal process using guanine as the sole carbon and nitrogen source. The as-prepared... 相似文献
48.
Fengbo Li Zhimo Gao Xiaoyu Li Lejin Fang 《Journal of Radioanalytical and Nuclear Chemistry》2014,299(3):1281-1286
Paecilomyces catenlannulatus (P. catenlannulatus), a kind of important pathogenic fungi of forest pests, can be regarded as an excellent material to retard the fate and transport of radionuclides. The effect of environmental factors (i.e., pH, ionic strength, temperature and solution concentration) on the uptake of 60Co by P. catenlannulatus was investigated by batch technique. The results showed that the uptake of 60Co by P. catenlannulatus was independent of pH at pH < 5.0, whereas the enhanced uptake of 60Co was observed with increasing pH from 5.0 to 8.0, then remained the high-level uptake at pH > 8.0 due to occurrence of precipitates. It is found that 60Co uptake significantly decreased with increasing ionic strength at low pH, whereas little change was observed at high pH. The pH dependence adsorption indicates that the interaction mechanism between 60Co and P. catenlannulatus is ion exchange at low pH and surface complexation at high pH conditions, respectively. Compared to Freundlich model, the adsorption isotherms can be fitted by Langmuir model very well. The thermodynamic data calculated from the temperature adsorption isotherms indicated that the uptake process of 60Co by P. catenlannulatus was an endothermic and spontaneous process. This paper focused on potential application of P. catenlannulatus as suitable bio-materials for the preconcentration and removal of radionuclides from aqueous solutions in environmental pollution management. 相似文献
49.
建立了一种通过原子荧光光谱测定糯米中汞含量的检测方法.采用硝酸/双氧水体系对样品进行微波消解预处理,利用原子荧光光谱法测定糯米中的痕量汞.方法加标回收率在98.67%-103.33%之间,相对标准偏差小于4.57%.该方法简便快速、准确灵敏,适用于糯米中痕量汞的测定. 相似文献
50.
采用水热法合成了一种新型的介孔二氧化钛/碳/亚甲蓝复合纳米团簇(TiO_2@C-MB),并应用于肿瘤细胞的光动力(PDT)和光热治疗(PTT)。系统中介孔二氧化钛作为有效的光敏剂,MB作为重要的光敏添加剂以改善二氧化钛纳米晶的光化学效应,并将其光响应区域拓宽至光动力学疗法的理想治疗窗(650~900 nm)。柠檬酸在水热条件下被还原成碳并裹覆在二氧化钛表面。碳层表现出良好的光热效果,也充当多功能的电子受体以加速生成单线态氧。该纳米团簇不仅可以保持肿瘤细胞内部高浓度的MB和二氧化钛以产生大量的单线态氧杀死肿瘤细胞,而且可以避免MB退化失活。 相似文献