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41.
M. Chatry M. Henry M. In C. Sanchez J. Livage 《Journal of Sol-Gel Science and Technology》1994,1(3):233-240
The hydrolysis and condensation of zirconium n-propoxide in n-propanol have been chemically controlled via the complexation of the zirconium precursor with acetylacetone. The size of the zirconium oxide-based particles is mainly controlled by the complexation ratio x=[acac]/[Zr]. the mean size increases from nanometric to submicronic range when x decreases from 1 to 0.1. Amorphous colloidal particles are obtained at room temperature. They result from a competitive growth/termination mechanism of zirconium-oxo species in the presence of acac surface capping agents. However non-aggregated nanocrystalline particles of tetragonal zirconia, about 2 nm in diameter are formed upon aging at 60°C when hydrolysis is performed in the presence of paratoluene sulfonic acid (PTSA). 相似文献
42.
壳聚糖富集火焰原子吸收法测定水中痕量铜 总被引:8,自引:2,他引:8
采用壳聚糖修饰钨丝基质螺旋卷,直接浸入含有痕量铜的pH5.0的Brltton-Robinson缓冲溶液中,经电磁搅拌富集一定时间后,将其转移至空气/乙炔火焰燃烧器上,利用火焰原子吸收光谱法简便快速测定水中痕量铜。方法的线性范围为2—75μg/L;检出限为0.98μg/L。同一支钨丝螺旋卷重复涂敷壳聚糖富集Cu,RSD(n=6)为2.7%。 相似文献
43.
Cui X Yu SH Li L Biao L Li H Mo M Liu XM 《Chemistry (Weinheim an der Bergstrasse, Germany)》2004,10(1):218-223
Selective synthesis of uniform single crystalline silver molybdate/tungstate nanorods/nanowires in large scale can be easily realized by a facile hydrothermal recrystallization technique. The synthesis is strongly dependent on the pH conditions, temperature, and reaction time. The phase transformation was examined in details. Pure Ag(2)MoO(4) and Ag(6)Mo(10)O(33) can be easily obtained under neutral condition and pH 2, respectively, whereas other mixed phases of Mo(17)O(47), Ag(2)Mo(2)O(7,) Ag(6)Mo(10)O(33) were observed under different pH conditions. Ag(6)Mo(10)O(33) nanowires with uniform diameter 50-60 nm and length up to several hundred micrometers were synthesized in large scale for the first time at 140 degrees C. The melting point of Ag(6)Mo(10)O(33) nanowires were found to be about 238 degrees C. Similarly, Ag(2)WO(4), and Ag(2)W(2)O(7) nanorods/nanowires can be selectively synthesized by controlling pH value. The results demonstrated that this route could be a potential mild way to selectively synthesize various molybdate nanowires with various phases in large scale. 相似文献
44.
45.
Investigations carried out in order to determine traces of 25 elements in tungsten in the lower g/g range are reported on. Atomic absorption spectrometry and plasma atomic emission spectrometry as well as solution photometry and activation analysis were the main techniques used. 相似文献
46.
本文在两次标准加入法[1]的基础上,提出了三组份同时测定的三次标准加入法,并应用于钼、钨和钛的流动注射同时测定。测定条件:[水杨基荧光酮(SAF)]=1.25 ×10-4mol/L,[溴化+六烷基三甲基铵(CTMAB)」=2.5×10-3mol/L,pH1.35,25℃,采样、进样时间分别为10s和18s,进样频率128次/h。为消除组份间协同作用引起的吸光度加合性的偏离,定义了三组份协同系数。将其引入三组份同时测定方法,补偿了吸光度对线性的偏离。补偿后钼、钨和钛的测定范围分别为0.05~0.35,0.25~1.00,0.025~0.30mg/L。测定了钢样及模拟样品中钼、钨和钛含量,结果较好。 相似文献
47.
本文通过η~5-Bz_5C_5MNa与氧化偶联试剂Fe_2(SO_4)_3/HOAc/H_2O的反应合成了含η~5-五苄基环戊二烯基配体的两个金属-金属单键化合物[η~5-Bz_5C_5(CO)_3M]_2(1:M=Mo;2:M=W),产率分别为45%和19%。1在沸腾的甲苯中可进一步脱羰而以98%的产率生成金属-金属三键化合物[η~5-Bz_5C_5(CO)_2Mo]_2(3)。1~3的结构均经碳氢分析,IR,~1H NMR和MS鉴定。3的结构尚被单晶X射线衍射分析确证。该晶体属单斜晶系,空间群P2_1/c,晶体学数据:。α=1.1335(5),b=1.3823(4),c=2.1655(6)nm;β=102.33(3)°;V=3.315(2)nm~3;Z=2;D_x=1.34g/cm~3;F(000)=1380。 相似文献
48.
49.
The analytical performance of a glow discharge quadrupole mass spectrometer is demonstrated using sintered tungsten as an example. The inherent problem of molecular interferences in glow discharge mass Spectrometry has been considerably reduced using neon as a complementing discharge gas. Particular attention has been paid to time dependences. Analytical figures of merit are presented. 相似文献
50.
A. Z. Voskoboinikov E. B. Chuklanova A. I. Gusev A. V. Kisin I. P. Beletskaya 《Russian Chemical Bulletin》1993,42(3):547-551
The cluster [Na(DME)3]2[W3(CO)14] (1) was prepared by treating CpLuCl2 with an equimolar mixture of Na2W(CO)5 and Na2W2(CO)10 in DME and characterized by X-ray analysis (MoK
radiation, 653 reflections,R = 0.125). The crystals are rhombic,a=18.749(4) Å,b=15.074(3) Å,c=9.505(3) Å,Z = 2, space groupC
mmm. The W-W distance in the W-W-W chain is 2.79 Å. The carbonyl ligands at the tungsten atoms are eclipsed. Compound 1 is the first example of a homometallic carbonyl cluster of an early transition metal. It is suggested that CpLuCl2 interacts with Na2W(CO)5 to afford the highly reactive species CpLu
(CO)5 which further reacts with Na2W2(CO)10 to form1.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 3, pp. 582–585, March, 1993. 相似文献