硫代磷酸/伯胺N1923协同萃取锌和镉的机理

有机硫代磷酸/伯胺N1923协同萃取锌、镉的萃取率随pH的变化较为反常，可能因伯胺N1923与硫酸作用进而聚为反向胶束. 实验表明，如以(N1923)n.H2SO4表示反向胶束的实验式，N1923与H2SO4比值n多为3左右，可能与空间效应相关. 萃取机理为: M2+(a) +2BHA(o) + (2/n)SO42–(a) = MA2(o) + (2/n)(Bn.H2SO4)(o) + 2(1–2/n)H+(a)， n=3, 4, 5.     

尖晶石型铁酸镉纳米粉体的超声化学法合成

超声波辐射下前驱体法合成了纳米铁酸镉（CdFe2O4）粉末。以硝酸镉、硝酸铁和脲为原料用超声化学法制得前驱体，再在950℃焙烧15h，得到平均粒径约56nm的铁酸镉粉末。得到的纳米铁酸镉粉末用X射线衍射（XRD）、扫描电镜（SEM）、傅里叶转换红外光谱（FT—IR）进行表征并得到确认，用样品振动磁强计（VSM）对其磁学参数进行了测定。     

一种新型吸附剂在痕量重金属分析中的应用

以二苯并18-冠-6交联席夫碱型壳聚糖作为新型吸附剂，用石墨炉原子吸收分光光度法测定了经过滤处理后的燃煤烟气中痕量铬、镉和铅的含量。经过滤处理后的燃煤烟气含铬1．42／μg／m3，其中三价铬占54．20％，为0．77μg／m3，镉0．256μg／m3，铅5．30μg/m3。     

Electrochromic display devices of tungstic oxide containing vanadium oxide or cadmium sulphide as a light-sensitive layer

Solid-state electrochromic display devices (ECDs) have been prepared using vacuum deposited tungstic oxide as the primary electrochromic material. Such devices form colour during irradiation from a fluorescent-tube as light source. Initial experiments incorporated (evaporated) CdS films and the proton-conducting poly(ethylene oxide)-phosphoric acid electrolyte (1:1) plasticised with acetonitrile. Successful photoelectrochromic devices were prepared in this way provided the electrolyte was anhydrous, since films of CdS are sensitive to water-attack. Another device to evince photoelectrochromism was one containing layers of WO₃ and V₂O₅. This combination of oxides was the most promising, responding to a 1/20s flash of intense white light. As yet, the colour formed in this way cannot be electro-bleached. These displays may also be used as normal—electrolytically driven—devices in the absence of irradiation.     

塑料原料中有害重金属铅、镉、汞的测定

采用微波消解为前处理手段 ,以磷酸二氢铵为基体改进剂 ,用石墨炉原子吸收法测定塑料原料样品中的铅、镉 ;用流动注射 -氢化物发生 -原子吸收法测定汞。测定铅的检出限为 4 .5× 10 -11g,镉的检出限为 3.7× 10 -12 g ,汞的检出限为 0 .6 4 μg/kg ;测定结果相对标准偏差一般小于 10 % ;铅、镉、汞的回收率在 93%～ 10 3%之间     

包裹型镉硒红在三种不同基础釉中的发色及影响因素

选取三种不同的熔块作为基础釉,研究ZrSiO4晶体包裹Cd(SxSe1-x)色料在其中的发色及外加不同含量Zn、Ca、Mg、Si、Na对发色和釉面质量的影响,并在本实验的基础上得到相关结论。     

巯基乙酸稳定的CdSe/ZnS核壳结构量子点的制备与表征

用非均相成核原理,在水溶液中制备CdSe/ZnS核壳结构量子点,并研究合成工艺,包括前驱物的滴加方式和用量、CdSe核的水浴反应时间、CdSe与ZnS的摩尔比等因素对CdSe/ZnS核壳结构量子点荧光性能的影响.用透射电子显微镜和x射线衍射仪测试核壳结构量子点的形貌和结构.用紫外吸收光谱与荧光光谱表征CdSe/ZnS核壳结构量子点的荧光性能.结果表明:ZnS壳层在CdSe核量子点表面外延生长,形成了核壳结构;CdSe/ZnS核壳结构量子点的荧光性能明显高于单一的CdSe量子点;合成的工艺条件会显著影响CdSe/ZnS核壳结构量子点的荧光性能.     

多壁碳纳米管修饰电极测定水样中痕量镉

通过多壁碳纳米管修饰玻碳电极,建立了水样中痕量镉的线性扫描阳极溶出伏安分析法。优化了支持电解质及pH、修饰剂用量、富集电位及时间等测定条件,在pH 4.0的NaAc-HAc缓冲液中,-1.10 V富集5 min后,溶出峰电流与Cd2 浓度在2.0×10-8~5.0×10-5mol/L的范围内呈良好的线性关系,检测限为8.0×10-9mol/L。该法用于实际水样中痕量镉的测定,平均回收率在98.7%~105.0%之间,结果满意。     

Texture prediction of Bi2Te3 electroplated layers using Hartman's theory of crystal growth

An experimental study of electroplated thin films of bismuth telluride, R3m crystal structure, shows that fibre textures are observed during the growth of the layers. Several orientations 00.1, 10.10, 11.0, 10.4, 10.8, 01.5 and 10.0 are developed during the deposition process, then reach a final orientation. Hartman's theory of crystal growth based on the periodic bond chain (PBC) in a crystal lattice is usually applied. This explains the equilibrium shape of a crystal defined by F faces and the faces observed during the growth (S and K faces). It also successfully predicts the orientations observed in bismuth telluride from the beginning to the end of the layer deposition. The theory may also be applied to other deposition processes.