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1.
By means of an electrochemical study, the influence of arsenic, antimony and cobalt on cathodic polarization in the zinc electrowinning process, the associated kinetic equations and parameters, and the polarization mechanism have been studied. The results show that the experimental values of the kinetic parameters are in accord with the theoretical values in the ZnSO4/H2SO4 solution with a single impurity is added. In contrast, the charge transfer coefficient α is smaller than the theoretical value in the ZnSO4/H2SO4 solution when the three impurities are added together. 相似文献
2.
LiXi Zeng YuJian He ZhiFeng Dai Jian Wang CaiQi Wang YongGang Yang 《中国科学B辑(英文版)》2009,52(8):1227-1234
Supramolecular chirality and molecular self-assembly are important and interesting phenomena in living and non-living systems.In this work,supramolecular chirality of achiral pseudoisocyanine(PIC) J-aggregates was successfully induced by D-,L-phenylalanine(Phe) and other amino acids in NaCl solution.The chiral J-aggregates showed a characteristic,induced circular dichroism(ICD) in the visible region of J-band chromophore which depends on the absolute configuration,concentration and side groups of α-amino ac... 相似文献
3.
金属纳米颗粒制备中的还原剂与修饰剂* 总被引:2,自引:0,他引:2
金属纳米颗粒由于其独特的光学、电学、化学性质以及各种潜在的应用价值,受到不少研究人员的广泛关注。实现金属纳米粒子尺寸、形貌可控,改善粒子分散性和稳定性,提高产率及纯度已成为具有挑战性的研究课题,不断发展和完善金属纳米粒子的合成方法则显得尤为重要。本文总结了目前制备金属纳米材料的几种化学方法:化学试剂还原法、电化学还原法、辐射还原法等,分类介绍了化学试剂还原法中常用的无机、有机还原剂,以及含氮、磷、羧基、巯基小分子有机化合物以及高分子聚合物等修饰剂并重点总结了其还原和修饰机理。 相似文献
4.
Influence of arsenic,antimony and cobalt impurities on the cathodic process in zinc electrowinning 下载免费PDF全文
YU XiaoHua XIE Gang LI RongXing LI YongGang & LU Ying Faculty of Metallurgical Energy Engineering Kunming University of Science Technology Kunming China Technology Center of Yunnan Metallurgy Group Co. Kunming 《中国科学:化学》2010,(3)
By means of an electrochemical study,the influence of arsenic,antimony and cobalt on cathodic polarization in the zinc electrowinning process,the associated kinetic equations and parameters,and the polarization mechanism have been studied.The results show that the experimental values of the kinetic parameters are in accord with the theoretical values in the ZnSO4/H2SO4 solution with a single impurity is added.In contrast,the charge transfer coefficient α is smaller than the theoretical value in the ZnSO4/H2... 相似文献
5.
HWANG Keh-Chih 《中国科学G辑(英文版)》2009,52(9):1375-1381
The flow theory of mechanism-based strain gradient plasticity theory (MSG) developed by Qiu et al. (2003) is extended for
incompressible material. The MSG flow theory is used to predict the increase of plastic work hardening for plane strain tension
of surface-passivated Cu thin film. The theoretical predictions agree well with experiments for suitably chosen material parameters.
Contributed by HWANG Keh-Chih 相似文献
6.
CHEN Jun LONG Yao LIU YongGang NIE FuDe & SUN JinShan Laboratory of Computational Physics 《中国科学:物理学 力学 天文学(英文版)》2011,(5)
The equation of states (EOS) of high energy explosive HMX (octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine) has been studied by using the first principle method. Our results include the lattice constants, elastic constants, and the dependence of total energy and pressure on volume for βand δ-HMX. The calculated elastic constants and the pressure-volume relationship of β-HMX are also compared with the experimental values. The theoretical tensile experiments are implemented on the β-HMX. The atomic-scale ana... 相似文献
7.
采用小角激光光散射(SALLS)和动态流变方法研究了通过不同制备方法得到的等规聚丙烯/乙丙橡胶共混物(iPP/EPR)的相分离行为与黏弹行为.依据Cahn-Hilliard-Cook理论分析了熔融共混和溶液共混法制备的质量比为60/40和40/60的iPP/EPR共混物在恒温相分离早期的动力学,发现熔融共混iPP/EPR具有更大的表观扩散系数(Dapp).相分离中后期的实验结果表明,当相区尺寸增长程度相同时,熔融共混试样所用时间更短.表明熔融共混iPP/EPR试样具有更快的相分离速率.动态流变测试结果表明,与溶液共混相比,熔融共混试样具有更快的松弛速率.考虑到相分离过程实质是由高分子链的运动与扩散所控制,两种方法制备的iPP/EPR共混物相分离速率的差异应归于其分子链运动能力的不同. 相似文献
8.
CHANG Kue-Chieh Alan 《中国科学:化学(英文版)》2012,55(6):1134-1139
A novel vehicle for the delivery of aspirin (ASA) was prepared from porous nano-hydroxyapatite/poly(styrene-divinylbenzene) [nano-HAP/P(St-DVB)] composite microspheres by grafting nano-HAP [Ca10(PO4)6(OH)2] onto porous P(St-DVB) microspheres. Four types of porous composite microspheres were prepared, each with different nano-HAP contents. The ASA-loaded composite microspheres prepared with 10% and 15% nano-HAP (mass ratio) exhibited excellent buoyancy with relatively short instantaneous floating time (within 10 min) and a long sustained floating time (12 h) in simulated gastric juice. They also offered good sustained release of ASA (up to 8 h). Furthermore, these composite microspheres displayed good buffering capacity that prevented the buildup of acidity caused by hydrolysis of ASA, keeping the pH of gastric juice within the normal range (pH 0.9 to 1.5). The results showed that porous nano-HAP/P(St-DVB) composite microspheres prepared with 10% and 15% nano-HAP could be used as a novel drug carrier for ASA, providing a sustained release dose without leading to stomach irritation, a side effect that is often associated with ASA medication. 相似文献
9.
Firstly, we investigate the necessary and sufficient conditions that an entangled channel of n-qubits should satisfy to carry out perfect teleportation of an arbitrary single qubit state and dense coding. It is shown that the sender can transmit two classical bits of information by sending one qubit. Further, the case of high-dimension quantum state is also considered. Utilizing n-qudit state as quantum channel, it is proposed that the necessary and sufficient conditions are in all to teleport an arbitrary single qudit state. The sender can transmit 2log2d classical bits of information to the receiver conditioned on the constraints. 相似文献
10.
Huang Yan-Jun Guo Gui-Yin Chen Chao-Feng Yang Li-Tao Shang-Guan Zhi-Hong Sha Xiang-Dong Yao Jian-Lin Hu Chen 《Journal of Radioanalytical and Nuclear Chemistry》2020,323(1):213-222
Journal of Radioanalytical and Nuclear Chemistry - Based on the requirements of the lower detection limit for the low-volume gaseous effluent, we have designed an automatic separation apparatus of... 相似文献