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51.
本文建立了用顶空气相色谱法测定反应堆冷却水中微量氢的方法,在气液体积比为1:2,平衡温度为60℃,平衡时间为40min的气液相平衡条件下H2的检测下限为0.02mL/LH2O2。对于H2浓度高于0.1mL/LH2O的冷却水水样,相对标准偏差小于5.0%,适用于反应堆水样的分析。 相似文献
52.
Jia Hua LIU Chao Zhan WANG Xin Du GENG 《中国化学快报》2006,17(6):799-802
Recombinant human granulocyte colony-stimulating factor (rhG-CSF) is a multifunctio- nal cytokine, which plays a key role in the immune system. High-level expression of rhG-CSF in Escherichia Coli (E.Coli) often accumulates in vivo as insoluble aggregates… 相似文献
53.
尽管Pt→Pt2+的φ高达1.20V,但由于Pt→Pt(OH)2的φ仅为0.165V,Pt→PtCl2-6的φ亦只有0.72V。所以在含氧酸及其可溶性含氧酸盐以及含卤素离子如Cl-溶液中以Pt作为不溶性阳极使用时,溶解损失是不可避免的。只有当表面覆有PtO、PtO2等氧化膜时,Pt的溶解才能降至可被忽略的地步 相似文献
54.
在室温下制备了立方体{100}、 四面体{111}、 菱形十二面体{110}和块体Ag3PO4微晶, 并进行了表征. 测定了其在不同温度下水溶液中的电导率, 结合强电解质溶液和溶解热力学理论, 得到了Ag3PO4微晶的溶解热力学函数. 以具有不同晶面的Ag3PO4微晶为模型, 研究了纳米材料溶解热力学函数的晶面效应和温度效应. 结果表明, 具有{110}晶面的菱形十二面体Ag3PO4的标准摩尔溶解吉布斯自由能()、 标准摩尔溶解焓()和标准摩尔溶解熵()最大, 具有{100}晶面的立方体Ag3PO4次之, 具有{111}晶面的四面体Ag3PO4最小; 溶解平衡常数( )和随着温度的升高而增大. 相似文献
55.
通过模拟实验研究了生物膜胞外聚合物(EPS)和乙二胺四乙酸(EDTA) 2种典型溶解有机质(DOM)成分对自然水体生物膜体系中过氧化氢(H2O2)生成特征的影响, 并研究了体系初始pH值、 DOM浓度、 溶解氧(DO)等因素的影响. 结果表明, DOM的存在对自然水体生物膜体系中H2O2的生成有明显影响. 光照能促使EPS产生H2O2, 而EPS的存在对生物膜产生H2O2的直接影响不显著, EPS与生物膜共存体系中的H2O2由二者共同产生; EDTA本身不产生H2O2, 且对H2O2分解影响很小, 但会显著抑制生物膜产生H2O2, 且浓度越高抑制作用越明显. 体系pH值、 DOM浓度和DO均能不同程度影响EPS产生H2O2及EDTA抑制生物膜产生H2O2的作用. 相似文献
57.
In the emerging field of nanoscience, tubular structures have been attracting remarkable interest due to their well-defined geometry, high specific area, and exceptional physical and chemical properties. Among them, oriented ZnO tubular arrays are regarded as promising candidates for various applications such as optoelectronics, solar cells, sensors, field emission, piezoelectrics, and catalysis. Although template-directed and selective dissolution synthesizing strategies are commonly used to prepare ZnO nanotubes, repeatability and large scale preparation are still challenging. In this study, ZnO nanotube arrays were controllably prepared by tuning the hydrothermal parameters, without the use of any additives. The mechanism underlying the self-conversion of ZnO nanorods to nanotubes was comprehensively studied based on the surface energy theory. It has been proved that the metastable top surface of the ZnO nanorods dissolves preferentially to reach a stable state during the hydrothermal growth. The specific surface energy of different crystal faces of ZnO nanorods was calculated using molecular dynamics simulation. The top surface of the ZnO nanorod, the Zn-terminated [0001] face, demonstrated much higher surface free energy than did the lateral faces, which indicated that the self-dissolution of top face (002) is energetically favorable. The self-conversion behavior of ZnO nanorod arrays with different diameters was specifically investigated by adjusting the initial precursor concentration, density of the crystal seed layers, and growth time. The dissolution-crystallization equilibrium concentration, determined by crystal surface energy, was found to be a key factor for the formation of the tubular structure. Notably, the critical equilibrium conditions for the self-conversion of ZnO nanorods to nanotubes, including zinc ion concentration and pH, have been identified by studying parameters corresponding to the dissolution-crystallization equilibrium for the metastable top surface of the ZnO nanorods. The preparation of the ZnO nanotube arrays was successfully accelerated and simplified via two-step procedure: (1) preparation of ZnO nanorod arrays and (2) self-conversion of ZnO nanorods to nanotubes. The preparation method based on the self-conversion mechanism from rods to tubes for polar oxides is simpler and more easily controllable as compared to the reported methods involving variety of additives. Because of the advantages of adaptability to a wide range of substrates, excellent conducting properties, and filling ability, the prepared ZnO nanotube array films were used in encapsulating phase-change materials. The encapsulated phase-change material exhibited excellent heat storage/release properties and heat conductivities. This indicates the potential application of precision devices for temperature control. 相似文献
58.
双波长荧光法同时测定水溶解态的茚、萘和菲 总被引:1,自引:0,他引:1
建立了一种同时测定水体中多组分溶解态多环芳烃的新方法。为消除共存组分干扰,利用三维荧光谱确定茚、萘和菲的最佳测量点为A(λex250.0nm,λem308.0nm)、B(λex225.0nm,λem335.0nm)、C(λex250.0nm,λem364.0nm);萘和菲相应的最佳参比波长分别为292.5nm和286.7nm,所建方法用于水体中茚、萘和菲的同时测定。其线性范围分别为:2.00×10-7~2.00×10-5mol/L、5.00×10-8~3.50×10-6mol/L和1.00×10-8~1.00×10-6mol/L;检出限分别为:8.63×10-9、1.01×10-8和5.29×10-10mol/L;相对标准偏差分别为:1.1%、1.0%和0.7%(n=7)。方法用于自来水样和海水样的测定,结果满意。 相似文献
59.
Microwave-assisted synthesis of new N4-[bi-(4-fluorophenyl)- methyl]-piperazine thiosemicarbazones under solvent-free conditions 总被引:2,自引:0,他引:2
Qing Han Li Zhi Gang Zhao 《中国化学快报》2008,19(9):1035-1038
Six new N4-[bi-(4-fluorophenyl)-methyl]-piperazine thiosemicarbazones 3a-f have been prepared starting from [bi-(4-fluorophenyl)-methyl]-piperazine in solvent-free condition under microwave irradiation with excellent yields. Their structures have been determined by elemental analysis, IR, MS and 1H NMR data. 相似文献
60.