Optical properties of cobalt xanthate films on different substrates

Cobalt isopropyl xanthate thin films (CXTFs) were deposited via chemical bath deposition onto different substrates: commercial glass (CG), indium tin oxide (ITO), and poly(methyl methacrylate) (PMM). Isopropyl xanthate was synthesized according to a method described in the literature. The cobalt nitrate and isopropyl xanthate were mixed in a beaker, which allowed the thin films to be deposited via a simple ion-ion mechanism. The transmission, reflectivity, refractive index, dielectric constant, and optical conductivity were investigated for various thin films coated onto different substrates. An ultraviolet-visible spectrophotometer was used to measure the optical properties of the thin films. The lowest value of the transmission and the highest value of the refractive index were observed for the thin films deposited onto PMM. The structure of the cobalt xanthate was characterized by Fourier transform infrared (FTIR) spectroscopy, which was measured using a Perkin-Elmer Spectrum 400 spectrometer. The stretching vibration of the Co-S bonds was observed at 359 cm-1 in the FTIR spectrum of the CXTFs.     

配位聚合物{[Co(bte)2(H2O)2](NO3)2}n的合成和阴离子可交换性质的研究

合成了配位聚合物{[Co(bte)2(H2O)2](NO3)2}n，研究了配合物的组成，并用红外光谱和粉末X射线衍射研究了它的阴离子可交换性质．红外光谱显示，在此聚合物中NO3^-是游离的，它可以被PF6^-置换．粉末X射线衍射图谱分析表明NO3^-被PF6^-置换后晶格发生了变化．     

Alternative Models of Iron and Cobalt Catalysts for Ethylene Oligomerization and Polymerization

1 Results Great progresses have been made in the field of transition metal-based complexes as catalytic precursors for olefin oligomerization and polymerization,in which the core subjects will remain as “know and how“ to develop novel catalysts both in academic and industrial consideration.The key advantage of iron and cobalt catalyst for ethylene polymerization is to produce vinyl-type polyethylenes.Therefore following the pioneering works of bis(imino) pyridyl iron and cobalt catalyst by Brookhart[1] ...     

EDTA、小分子有机酸对蛇纹岩发育土壤Ni、Co活性的影响

研究了不同浓度的EDTA、柠檬酸以及丙二酸对蛇纹岩发育土壤中Ni、Co活性的影响。结果表明：在供认土壤中，Ni、Co的活化量随着EDTA、有机酸浓度的增大而增大，EDTA的活化效果大于其它两种小分子有机酸。同时也发现随着浓度的增大，EDRFA与重金属的结合效率有下降的趋势，柠檬酸与丙二酸的结合率则呈现先上升后下降的趋势。EDTA对土壤的重金属萃取的最佳浓度约在1—10mmol／l之间。柠檬酸、丙二酸活化土壤中Ni、Co的最佳浓度浓度范围在10～30mmol／L之间。     

新型钴配合物[Co(chedc)(4,4'-bpt)_2(H_2O)_3]NO_3·H_2O的合成及其晶体结构

以顺-4-环己烯-1,2-二羧酸(chedc)、3,5-二(4-吡啶基)-1,2,4-三氮唑(4,4'-bpt)、六水合硝酸钴为原料,通过室温条件下自然挥发得到一个单核Co(II)的配合物[Co(chedc)(4,4'-bpt)_2(H_2O)_3]NO_3·H_2O(1),其结构经IR、元素分析、X-射线单晶衍射进行表征.晶体属单斜晶系,空间群P21/c,晶胞参数a=1.198(2)nm,b=1.361(3)nm,c=2.202(4)nm,β=92.65(3)°,V=3.584(12)nm3,Z=4,Dc=1.499 g·cm-3,F(000)=1676,R1=0.0627,ωR2=0.1190.     

钴基高温合金K640S返回料应用的试验研究

研究了钴基铸造高温合金K640S在多次返回重熔过程中成分、组织和性能的变化·结果表明,该合金的返回料按照适当的工艺多次返回重熔后,其组织和性能无明显变化·经10次返回后合金的综合性能仍能满足使用要求·     

钴高速钢价电子结构与回火性能的研究

计算了含钴高速钢的价电子结构与共价键能 .发现 Co可增强奥氏体和马氏体基体金属原子间结合力 (键参数 nα相应提高 1 2 .5 %～ 30 %和 2 0 %～ 2 7% ) ,有利于更高温度奥氏体化及回火析出量增加 .Co削弱 C与近邻原子的键强与键能 ,提高 C的活度 ,但由于 W- Co,Mo- Co等强键存在 ,因此 Co促进了特殊碳化物的初始析出 ,却阻碍其聚集 ,结果在强化的 α相基体上形成数量更多、弥散程度更高的回火析出 ,提高了其淬火回火状态的室温硬度、高温硬度及红硬性 .     

T8钢表面激光熔覆钴基硬面合金层的相组织与性能的研究

应用横流式连续ＣＯ２激光器,采用不同的激光工艺参数在Ｔ８钢表面上熔覆钴基硬面合金,然后用Ｘ射线衍射法、电解萃取法、比色法、耐磨试验及理论计算等研究了合金层的组织结构及性能．研究表明：激光熔覆的钴基硬面合金层,其显微硬度提高主要由ｒ（ＣｏＣｒ）基体相的过饱和度所贡献,而耐磨性能提高主要是Ｍ７Ｃ３碳化物析出量增加起了更大的作用．     

含硅和钴中孔磷酸铝分子筛的合成及其波谱学性质

通过表面活性剂的模板作用合成出含钴和硅的中孔磷铝分子筛,27Al和31P MAS NMR谱的结果表明,Si和Co分别进入分子筛骨架,UV－DRS谱的结果 分子筛骨架上Co(II)以国面体配位形式存在,少量Si的加入有利于CO进入骨架位。     

CPA矩阵法同时测定镍、钴、铜

利用新合成的显色剂5－溴－（2－噻唑偶氮）－5－二甲氨基苯甲酸（简称5－Br-TAMB）通过各种条件试验,建立了镍、钴、铜三元素同时测定且选择性良好的分析体系,采用计算机自动选择最佳波长的CPA矩阵法处理所得数据,可以迅速而准确地给出各组分的含量,测量误差不超过5％。