Preparation of gold nanorods of high quality and high aspect ratio

We report the synthesis of gold nanorods (NRs) by seed-mediated growth method. A small amount of different shapes such as triangles, hexagons and a large amount of rods are obtained by varying the proportion of seed to metal salt, adding NaOH to growth solution as well as using the seed solution of CTAB-capped agent. The gold nanorod (NR) formation yield is improved. Meanwhile, the growth mechanism of high yield gold NRs is discussed. The high quality single size NRs can be separated from polydisperse samples using surfactant-assisted nanorod self-assembly. The gold NRs synthesized were characterized by transmission electron microscopy (TEM) and UV-vis spectroscopy.     

从多硫化物浸金贵液和石硫合剂浸金贵液中萃取金的研究

研究了ＴＢＰ、胺类萃取剂及其混合体系从多硫化物含金贵液中萃取金的规律,考察了一些影响萃取平衡的因素．实验结果表明：ＴＢＰ与胺类萃取剂都能从碱性多硫化物介质中萃取金;在胺类萃取剂中,伯胺的萃取能力要强于叔胺的萃取能力．并对具有协萃效应的Ｎ１９２３－ＴＢＰ混合体系进行了深入研究．选择０．５ｍｏｌ／Ｌ Ｎ１９２３－０．５ｍｏｌ　ＴＢＰ／正辛烷混合体系为萃取有机相,验证其从多硫化物浸金贵液中和石硫合剂浸金贵液中萃取回收金及金铜分离的情况．结果表明：在ｐＨ〈８或ｐＨ〉１１时的碱性介质中,金与铜的分离效果很好,金的一次萃取率较高．     

金／硫团簇非共价键相互作用的研究与意义

运用高性能飞行时间二次离子质谱,首次观测和表征了气相金团簇与硫团簇非共价键相互作用产物－[Au1-19][S1-5]型金／硫二元团簇负离子,这一发现从团簇化学的角度支护了最近提高的溶液化学中金／硫化学自组装过程中存在非共价键相互作用的观点。进而,第一次明确提出了关于自然界中金的成矿地球化学应着重考虑金与硫之间非共价键相互作用的新概念,从而为今后立足于现代化学概念深入研究探索金的成矿规律构筑了基础框架。     

有机锑高效PVC热稳定剂的合成

为开发有机锑类高效ＰＶＣ热稳定剂,以三氧化二锑与自制的十二烷基硫醇为原料,合成了三（十二烷基硫醇）锑,。产率可达８７．８％;以三氧化二锑与自制的巯基乙酸异辛酯为原料,合成了三锑,产率可达９３．８％,通过正交实验对反应条件进行了优化。对两产物中间产品进行了分析鉴定。结果与文献值相符。     

Experiment study on water-rock interaction about gold activation and migration in different solutions

Ｔｈｅｉｎｔｅｒａｃｔｉｏｎｂｅｔｗｅｅｎｇｏｌｄ ｂｅａｒｉｎｇｒｏｃｋｓａｎｄａｑｕｅｏｕｓｆｌｕｉｄｐｈａｓｅｕｎｄｅｒｈｙｄｒｏｔｈｅｒｍａｌｃｏｎ ｄｉｔｉｏｎｓｉｓａｖｅｒｙｉｍｐｏｒｔａｎｔｇｅｏｃｈｅｍｉｃａｌｐｒｏｃｅｓｓ .Ｉｔｉｓｗｅｌｌｋｎｏｗｎｔｈａｔａｔｈｉｇｈｔｅｍｐｅｒａｔｕｒｅ ,ｔｈｅａｃｔｉｖｅａｎｄｍｉｇｒａｔｏｒｙｒａｔｅｓｏｆｇｏｌｄｉｓｃｌｏｓｅｌｙｒｅｌａｔｅｄｔｏｓｏ ｌｕｔｉｏｎｗｉｔｈｈｉｇｈｃｏｎｃｅｎｔｒａｔｅｄｃｈｌｏｒｉｎｅ ;ｉｎｍｅｓｏ ｅ…     

Effects of sulfurous acid on anodic process of gold electrode in thiourea solution

Thioureaitselfisunstableunderanappropriateoxidizingconditionandcanbeoxidized .Theoxida tion productsofthioureadependontheoxidants ,suchashydrogenperoxide ,ferriciron .Itwasreport edthatwithferricironetc ,thioureadecomposedasfollows[7] .2SC(NH2 ) 2 (SC(NH)NH2 ) 2 + 2H++ 2e(2 )ThepotentiodynamicpolarizationcurvesshowninFig .1wereobtainedin 0 .0 5mol/Lthiourea(TU )solutionforafreshlygroundstationarygoldelectrodestartsfrom 0to 1.2 0VvsSCE .FromFig .1itcanbeseenthatthefirstanodicshoulderais…     

Highly oriented ZnO rod arrays on Si substrates from aqueous solution

Ordered zinc oxide （ZnO） rod arrays with very high orientation were fabricated on Si substrates by using a solution method. The substrate surfaces were functionalized by Self-Assembly Monolayers （SAMs）. In the very early growth stage, the oriented ZnO crystals had already grown, which appeared to be the main reason why ZnO nanorods showed very high orientation. The un-dense and un-uniform SAMs provided a surface that was heterogeneous to ZnO nucleation. Consequently, highly oriented ZnO rods were selectively grown on the ＂coin-like＂ SAM-uncovered regions. The route developed here can provide some helpful information to control the nucleation and orientation of ZnO in aqueous solution. Also, the site-selective growth mechanisms can indicate a clue to grow patterned highly oriented ZnO nanorod arrays by the organic template.     

Mechanism of gold dissolving in alkaline thiourea solution

Reaction mechanism of gold dissolving in alkaline thiourea solution was studied by electrochemical methods,such as cyclic voltammetry,chronopotentiometry,AC impedance,linear sweep voltammetry.Apparent activation energy of anodic process of gold electrode dissolving in alkaline thiourea solution is 14.91 kJ/mol.Rate determining step is the process of gold thiourea complex diffusing away from electrode surface to solution.The results of AC impedance and chronopotentiometry indicate that thiourea adsorbs on gold electrode surface before dissolving in solution.There does not exist proceeding chemical reactions.Formamidine disulfide,the decomposed product of thiourea,does not participate the process of gold dissolution and thiourea complex.Species with electro-activity produced in the process of electrode reaction adsorbs on the electrode surface.In alkaline thiourea solution,gold dissolving mechanism undergoes the following courses:adsorption of thiourea on electrode surface;charge transfer from gold atom to thiourea molecule;Au[SC(NH2)2]ads receiving a thiourea molecule and forming stable Au[SC(NH2)2]2 ;and then Au[SC(NH2)2]2 diffusing away from the electrode surface to solution,the last step is the rate-determining one.     

Pretreatment and thiosulfate leaching of refractory gold-bearing arsenosulfide concentrates

A hydrometallurgical process for refractory gold-bearing arsenosulfide concentrates at ambient temperature and pressure was presented, including fine grinding with intensified alkali-leaching （FGIAL）, enhanced agitation alkali-leaching （EAAL）, thiosulfate leaching and displacement. Experimental results on a refractory gold concentrate showed that the total consumption of NaOH in alkaline leaching is only 41% of those theoretically calculated under the conditions of full oxidization for the same amount of arse- nides and sulfides transformed into arsenates and sulfates, and 72.3% of gold is synchro-dissoluted by thiosulfate self-generated during alkaline leaching. After alkaline leaching, thiosulfate leaching was carried out for 24 h. The dissolution of gold is increased to 91.9% from 4.6% by cyanide without the pretreatment. The displacement of gold by zinc powder in the solution gets to 99.2%. Due to an amount of thiosulfate self-generated during alkaline leaching, the reagent addition in thiosulfate leaching afterwards is lower than the normal.     

硫氰酸盐法从高铜硫化金矿中浸取金银的研究

本文对含高钢硫化浮选精金矿，采用新的硫氰酸盐法浸取金银，对影响浸取金的因素进行了仔细的研究，并与传统的氰化法做了比较，结果表明此法对难处理的高铜金矿有较高的浸取率，浸取速度快，浸取剂性质稳定，基本上不污染环境，是一个很有前途的提金方法。     

光度法分析矿样中的金

制定了用乙基紫为显色剂的光度法分析金溶液、金矿浸取液及矿样中金的定量分析操作方法。此法与目前采金工业上使用的吸附一碘量法相比,具有简便、迅速、适用范围宽及准确度高等优点。     

金纳米棒的制备与影响因素研究

采用晶种生长法制备金纳米棒,考察了硼氢化钠、硝酸银以及抗坏血酸的用量对金纳米棒制备的影响,并对其进行了优化;采用紫外-可见分光光度计和透射电镜显微镜对金纳米棒进行表征。实验结果表明,在最优条件下,制备了长轴35 nm,长径比为3.4,且表面光滑、形状均匀的金纳米棒。     

用353E树脂回收氰化镀金废液中的金

353E树脂是大孔双官能团阴离子交换树脂,对金具有良好的吸附性能,氰化镀金废液中的金是以Au(CN)~-_2配离子形式存在,为了回收镀金废液中的金,我们选用了353E树脂吸附法,研究了金的吸附条件,解吸条件,还原分法以及交换柱的放大实验等,为进一步工业回收提供了实验依据。     

在高ECR 等离子体密度下沉积高质量氮化镓薄膜

目的　研究在电子回旋共振等离子体辅助法生长ＧａＮ 时的离子密度对其质量的影响．方法　用朗缪尔探针测量离子密度,用Ｘ 射线双晶衍射及霍尔测量分析ＧａＮ的质量与性能． 结果离子密度越高,薄膜的质量与性能就越好． 当生长ＧａＮ 时的离子密度为２－０ ×１０１１ ｃｍ － ３ 时,所得ＧａＮ 晶膜的氮镓量比接近于１ ,本底电子密度为３－７ ×１０１８ ｃｍ － ３ ,Ｘ 射线双晶衍射回摆曲线的半高宽为１６ ａｒｃｍｉｎ ． 结论　提高离子密度能明显提高ＧａＮ 的质量与性能     

云南哀牢山成矿带南段金矿控矿因素分析

在对云南哀牢山成矿带地质特征研究的基础上,借助GIS空间分析功能,对哀牢山成矿带南段金矿控矿因素进行了分析,建立了金矿信息找矿模型.结果显示:金矿受NW向断裂构造控矿明显,在其周边3 km范围内是本区有利的找矿远景区;与岩浆岩关系密切,岩体在很大程度上控制了金矿床(点)的产出;与地层关系差;区内地层和岩浆岩可能为金矿提供了物源,与金矿关系最为密切的元素化探异常有Au、Ag、Cu、Pb、Bi.     

KTNP晶体生长、结构与粉末倍频效应的研究

采用高温溶液籽晶降温法生长了一系列ＫＴＮＰ晶体,研究了ＫＴＮＰ溶液的性质、ＫＴＮＰ晶体生长基元及其生长形态,测定了ＫＴＮＰ晶体的晶胞多数、红外光谱、吸收光谱和粉末倍频效应．最后,简要地讨论了所获得的一些研究结果．     

氨基磺酸法剥离废印刷线路板表面镀金层的研究

含有贵金属金的废弃印刷线路板有较高回收价值。采用氨基磺酸腐蚀法,浸出镀金层下的铜和镍,回收得到金箔。探索氨基磺酸法回收金的最佳工艺条件,研究结果表明:常温条件下,取内存条与氨基磺酸溶液的固液比(g/mL) 1:5,双氧水体积分数15%,氨基磺酸浓度70 g/L,废旧内存条浸出时间120 min (不同类型板因镀层差异剥落时间稍有差异),此工艺条件下金的回收率可以达到96%以上。氨基磺酸腐蚀法对金的回收选择性好,剥离的金箔可直接熔炼,脱金后的线路板可用于回收其他金属和非金属;溶液回收铜镍后,可循环使用,实现回收过程中的闭路循环,减轻环境污染。     

Effects of gold plating on the resistance to high temperature discoloration of the cavity for ceramic packages

The effects of thickness and types of gold plating on the resistance to high temperature discoloration of gold plating on cavity surface of ceramic package were investigated. It was found that the thicker gold plating, the less discoloration degree for ceramic packages. Non-cyanide gold plating performed better resistance to high-temperature aging than cyanide gold plating. The relationship between the gold plating thickness and the amount of diffused Ni to the gold plating of ceramic packages with Au/Ni and Au/Ni-Co platings after heating at 420℃ for 15 min was also studied. When the gold plating thickness reach 2.0 μm and 1.6 μm for Au/Ni and Au/Ni-Co plating systems, respectively, no discoloration was observed on the gold plating surface of cavity, and the corresponding diffused Ni amounts (mass fraction) are 1.0% and 0.4%, while the diffused Co to the gold plating is 0.04%.     

高应力水平下表面裂纹疲劳扩展规律的实验研究

多次错误操作或水锤现象等可能引起结构部件承受高应力水平下的疲劳载荷作用。在前人的研究工作中，含表面裂纹板疲劳试验的远场应力水平绝大多数不超过０．６σｙ，。本文通过应力水平为０．８５～０．９５σｙ，的１６ＭｎＲ钢合表面裂纹板的疲劳实验研究，来回答在Ｐａｒｉｓ、Ｃｈｅｌｌ（考虑最大应力的影响）和Ｆｏｒｅｍａｎ（考虑平均应力的影响）等公式中，在这样高的应力水平下究竟哪一个模型更适合描述表面裂纹疲劳扩展速率。实验结果分析表明：对于高韧性材料而言，即使在接近屈服的高应力水平下，Ｐａｒｉｓ公式仍不失为诸多应力疲劳扩展速率描述公式中最有效的。此外，还仔细观察了表面裂纹疲劳扩展的客观几何形貌和微观断裂特征。     

ONE-STEP LEACHING OF SOME REFRACTORY GOLD CONCENTRATECONTAINING ARSENIC AND THEORY ANALYSIS

Withlarge--scaleexploitationoftheeasy--toseparateandextractgoldore,theresourcesarebecomingexhausted,whichpressespeopletoexploitandutilizerefractorygoldore.FeAsSandFeS,aremajorsulfidemineralofgoldcarrier,inwhichgoldismaceratedintheformofmicro--particle.Itisdifficulttoseparategoldtomonomersbyfinegrinding.Thiskindofgoldoreisatypicallyrefractoryore.Furthermore,FeAsSandFeS,,especiallyFeS,,aresuchstablesulfidemineralsthatsomeextremetreatment(suchashigh--temperature,high--pressureandacuteoxidant…