双水相体系中Cu(Ⅱ)的显色反应研究

本文研究了铬黑Ｔ（ＥＢＴ）作萃取剂和显色剂,在聚乙二醇－２０００（ＰＥＧ）－Ｎａ２ＳＯ４－ＥＢＴ双水相体系中Ｃｕ（Ⅱ）的显色反应条件及应用,实验结果表明,在ｐＨ８．５缓冲溶液中,将Ｃｕ（Ⅱ）络合物从水溶液中萃取到ＰＥＧ相,其最大吸收波长位于５６０ｎｍ,摩尔吸光系数为３．０５×１０＾４Ｌ·ｍｏｌ＾－１·ｃｍ＾－１,此法用于铝合金中铜的测定,获得了满意结果。     

荧光光度法测定氢化可的松的研究

提出了在ＰＨ１０．３８的碱性介质中高灵敏度测定氢化可的松的荧光光度新方法。方法灵敏度高,检出限为２．８×１０＾－９ｍｏｌ·Ｌ＾－１;线性范围为５．５１８×１０＾－９－３．８６２×１０＾－６ｍｏｌ·Ｌ＾－１。应用本法测定注射液中氢化可的松,平均回收率为９９．３％,结果令人满意。     

酸性品红分光光度法测定蛋白质的研究

在ＰＨ１．８的ＫＨ２ＰＯ４－Ｈ３ＰＯ４缓冲介质中,蛋白质与酸性品红结合使染料的吸光度下降。蛋白质浓度Ｃ在０．４０－４．００ｍｇ·Ｌ＾－１和８．００－４０．００ｍｇ·Ｌ＾－１范围内,吸光度的降低与蛋白质浓度（Ｃ）呈线性关系,回归方程分别为△Ａ＝０．０１４０Ｃ＋０．０５３４和△Ａ＝０．０１０９Ｃ＋０．０８９５,相关系数ｒ依次为０．９９６５和０．９９９３,方法用于奶粉和麦片中蛋白质的测定,结果满意。     

析相光度法测定铜（Ⅱ）的研究

本文研究了Ｃｕ－ＰＥＧ－ＤＤＴＣ（铜试剂）（ＮＨ４）２ＳＯ４体系的析相光度法并应用于测定Ｃｕ。最宜酸度为３．６－９．０（ＮａＡｃ－ＨＡｃ，ＮＨ４Ｃｌ－ＮＨ３．Ｈ２Ｏ）缓冲溶液，其络合物的最大吸收位于４５０ｎｍ，表观摩尔吸光系数为９．０５×１０＾３Ｌ．ｍｏｌ＾－１．ｃｍ＾－１，Ｃｕ浓度在０－３０μｇ／Ｌ范围内服从比耳定律，铜与ＤＤＴＣ形成组成为１：２的稳定络合物。该方法用于铝合金中铜的测定，获得了满     

新显色剂8-喹啉偶氮槲皮素的合成及其与Fe(Ⅲ)显色反应的研究

本文研究了新显色试剂８－喹啉偶氮槲皮素的合成方法及其理化性质,显色性能和与Ｆｅ（Ⅲ）的显色反应条件,在ＴｗｅｅＮ－８０存在下,ＰＨ＝１０．３的ＮＨ３－ＮＨ４Ｃｌ缓冲介质中,Ｆｅ（Ⅲ）与８－ＱＡＱ的络合物在５００ｎｍ处有最大吸收,表观摩尔吸光系数为１．０６×１０＾５Ｌ·ｍｏｌ＾－１·ｃｍ＾－１,Ｆｅ（Ⅲ）含量在０－２．６μｇ／１０ｍＬ范围内符合比耳定律。在室温下,络合物至少稳定１５ｈ,络合比为１：３     

铊系超导单昌的低温生长

采用蠕爬型助熔剂ＣａＯ－ＣｕＯ和蒸发型复合助熔剂ＣａＯ－ＣｕＯ－ＮａＣｌ来制备Ｔｌ－Ｂａ－Ｃａ－Ｃｕ－Ｏ超导单晶，生长炉最高温度８９０℃和８５０℃，因而实现了铊系单晶的低温生工。生长出的单晶分别是典型尺寸为２．０×１．５×０．２ｍｍ＾３，Ｔｃ在１００Ｋ与１１９Ｋ之间的Ｔｌ－２２１２相单晶和尺寸为１．２×１．０×０．１ｍｍ＾３。Ｔｃ约为１１５Ｋ的Ｔｌ－２２２３相超导单晶。     

新间接紫外光度法测定微量SO3^2—

在ｐＨ７．０混合磷酸盐介质中,ＳＯ３＾２－使Ｉ３＾－与ＣＴＭＡＢ生成离子缔合物ＣＴＭＡ＾＋,Ｉ３＾－而褪色,从而建立了测定ＳＯ３＾２－的新间接紫外光度法,测定波长为３６５ｎｍ,ＳＯ３＾２－浓度在０－２５μｇ／２５ｍＬ内服从比耳定律,表观摩耳吸光系数为ε＝６．０４×１０＾４Ｌ·ｍｏｌ＾－１·ｃｍ＾－１,可用于食品中微量ＳＯ３＾２－的测定,其结果满意。     

锆(Ⅳ)-桑色素-曲拉通显色反应的研究与应用

本文提出在曲拉通Ｘ－１００存在下,以桑色素为显色剂吸光光度法测定痕量锆的新方法。在「Ｈ＾＋」＝０．５－２．０ｍｏＬ的ＨＣｌ介质中形成三元配合物,其最大吸收波长为λｍａｘ＝４３０ｎｍ,摩尔吸光系数ε４３０＝９．８×１０＾４Ｌ·ｍｏｌ＾－１·ｃｍ＾－１,锆量在０－１５μｇ／２５ｍＬ范围内遵守比耳定律,该方法简捷、准确,应用于铝合金中痕量锆的测定,共存离子不干扰,测定令人满意。     

ICP－AES法直接测定高纯Eu_2O_3中14种稀土元素

建立了ＩＣＰ－ＡＥＳ测定高纯Ｅｕ２Ｏ３中１４种稀土元素的方法。用正交设计法优化仪器测量条件，实验了基体Ｅｕ２Ｏ３对被测元素的干扰和对方法测定下限的影响。１４个稀土元素的测定下限为：Ｙｂ２Ｏ３０．５μｇ·ｇ－１，Ｙ２Ｏ３１μｇ·ｇ－１，Ｄｙ２Ｏ３、Ｈｏ２Ｏ３、Ｔｍ２Ｏ３和Ｎｄ２Ｏ３５μｇ·ｇ－１，Ｇｄ２Ｏ３、Ｓｍ２Ｏ３、Ｅｒ２Ｏ３、Ｃｅ２Ｏ３、Ｐｒ６Ｏ１１和Ｌａ２Ｏ３１０μｇ·ｇ－１，Ｌｕ２Ｏ３２０μｇ·ｇ－１以及Ｔｂ４Ｏ７３０μｇ·ｇ－１。加入回收率为８８－１１２％，六次取样分析的相对标准偏差小于１１％。方法简便不经化学分离，可用于９９．９－９９．９９％Ｅｕ２Ｏ３中稀土杂质的测定或生产控制分析。     

等色染料离子对-溴酚蓝·亚甲蓝的吸光性质研究

本文研究了酸性染料溴酚蓝和碱性染料亚甲蓝以及二者的形成离子对缔合物的吸光性质,测定了它们的缔合能力,Ｋｓｐ＝８．３×１０＾－１５,离子对二氯乙烷中的萃取率为９１５,离子对形成后溴酚蓝的最大吸收波长红移同亚甲蓝等色化,缔合物在二氯乙烷中的ε＝１．３×１０＾５Ｌ·ｍｏｌ＾－１·ｃｍ＾－１,为高灵敏度双显色剂的应用找到了新途径。     

Dendritic growth and solute trapping in rapidly solidified Cu-based alloys

Rapid solidification of binary Cu-22%Sn peritectic alloys and Cu-5%Sn-5%Ni-5%Ag quaternary alloys was accomplished by glass fluxing, drop tube and melt spinning methods. The undercooled, by glass fluxing method, Cu-22%Sn peritectic alloy was composed of α(Cu) and δ(Cu41Sn11) phases. If rapidly solidified in a drop tube, the alloy phase constitution changed from α(Cu) and δ(Cu41Sn11) phases into a single supersaturated (Cu) phase with the reducing of droplet diameter, and the maximum solubility of Sn in (Cu)...     

Direct fabrication of copper patterns by reactive inkjet printing

Reactive inkjet printing (RIP) was applied to fabricate arbitrary copper (Cu) patterns. RIP prints reactive inks which can provide desired materials after the reaction on a substrate. Here, Cu precursors and reducing agents were dissolved together in one solution as a printable ink instead of conventional Cu nanoparticle inks. The prepared reactive ink was applied to the RIP method to provide dot arrays, lines, and films of Cu. The synthesis of Cu was confirmed to occur successfully by thorough analysis. The RIP method can reduce the process cost and resolve critical drawbacks of the conventional inkjet printing such as a nozzle clogging problem. Furthermore, utilizing reactive precursor inks broadens the choice of materials that can be processed by inkjet printing.     

N-邻羟基苯基马来酰胺酸-改性活性炭对Cu(Ⅲ)的吸附性能

研究了新型吸附剂N-邻羟基苯基马来酰胺酸-活性炭(AC-HPMA)对样品中Cu(Ⅱ)的固相萃取并用电感耦合等离子体-原子发射光谱法(ICP-AES)测定。优化了pH值、吸附剂(AC-HPMA)的用量、流速等条件以达到定量吸附(≥95%),同时考察了共存离子的影响和洗脱剂的洗脱条件。本法测定Cu(Ⅱ)的检出限为0.27μg.L-1,将其应用于茯苓、黄河水、青海湖水中的Cu(Ⅱ)含量的测定,加标回收率在96.3%—99.0%之间;用于测定标准物质中铜离子的含量,结果与标准物参照值一致。     

Enhanced photocatalytic activity of ultra-high aspect ratio ZnO nanowires due to Cu induced defects

We report the synthesis of ZnO nanowires in ambient air at 650°C by a single-step vapor transport method using two different sources Zn (ZnO nanowires-I) and Zn:Cu (ZnO nanowires-II). The Zn:Cu mixed source co-vaporize Zn with a small amount of Cu at temperatures where elemental Cu source does not vaporize. This method provides us a facile route for Cu doping into ZnO. The aspect ratio of the grown ZnO nanowires-II was found to be higher by more than five times compared ZnO nanowires-I. Photocatalytic activity was measured by using a solar simulator and its ultraviolet-filtered light. The ZnO nanowires-II shows higher catalytic activity due to increased aspect ratio and higher content of surface defects because of incorporation of Cu impurities.     

Complete filling of 41 nm trench pattern using Cu seed layer deposited by SAM-modified electroless plating and electron-beam evaporation

To overcome the limitation of the sputtered Cu seed layer in electroplating of Cu interconnects imposed by the shadow effect, a new method for depositing a Cu seed layer on a 41 nm trench pattern based on combination of electroless plating (ELP) and electron-beam (E-Beam) evaporation was developed. A Cu seed layer formed by ELP alone was too thin to be used for electroplating due to its high resistivity. To solve this problem, an additional Cu layer was deposited on top of the trench by E-Beam evaporator to enhance the electrical conductivity of the Cu seed layer. The electrical resistivity of the resulting Cu layer was reduced to 4.8 μΩ cm, which was sufficient for the conductive seed layer for electroplating the 41 nm trench pattern. The gap-filling capability also improved and there were no voids or seams in the 41 nm trench pattern. The proposed method can be an effective solution for fabrication of a conductive seed layer to fill a 41 nm trench pattern by electroplating.     

Effect of interface number on giant magnetoresistance

Ni(Cu)/Cu, Co(Cu)/Cu, and Ni-Co(Cu)/Cu multilayers with a varied number of interfaces (i.e. bi-layers) were electrodeposited on gold coated quartz discs in a flow channel cell by a potentiostatic dual-pulse plating method. It was found that the giant magnetoresistance of these multilayers increased almost linearly with increase in the number of interfaces. This result confirms that the interfaces play a dominating role in giant magnetoresistance. Comparable samples of these three types of multilayers were prepared under identical electrochemical conditions from appropriate baths. The result showed that Ni-Co(Cu)/Cu multilayers exhibited much higher giant magnetoresistance than Ni(Cu)/Cu, and Co(Cu)/Cu multilayers, which was possibly due to the structural differences between the multilayers.     

Nonvolatile hologram storage properties of tri-doped Zn:Ce:Cu:LiNbO3 crystals

Congruent Zn(7 mol%):Ce:Cu:LiNbO₃ single crystal was grown by the Czochralski method in air. The occupation mechanism of the Zn²⁺ was discussed by an infrared transmittance spectrum. The nonvolatile holographic recording in Zn(7 mol%):Ce:Cu:LiNbO₃ single crystal was measured by two-photon fixed method. Zn(7 mol%):Ce:Cu:LiNbO₃ single crystals present the faster recording time and higher light-induced scattering resistance ability comparing with Ce:Cu:LiNbO₃ single crystals.     

烟叶中微量元素的电热蒸发ICP-AES法直接分析研究

本文以聚四氟乙烯(PTFE)悬浮体为化学改进剂,采用悬浮体制样电热蒸发(ETV)ICP-AES法直接测定了烟叶中微量元素(Cu,Fe,Al,Cr,Mn)的含量。研究了待测物的氟化蒸发行为,考察了化学改进剂PTFE浓度、灰化温度、蒸发温度、共存离子对待测物信号强度的影响。在优化实验条件下,方法的检出限为3.8ng·mL~(-1)(Cu)～13ng·mL~(-1)(Fe),相对标准偏差为2.5％(Cu)～5.7％(Cr),回收率在91.0％～112％。     

浮选光度法测定痕量铜

根据 Cu(DDTC) 2 易浮选于苯中 ,建立了溶剂浮选测定铜的新光度法 ,本法灵敏度高 (ε=2 .9× 10 5L·mol-1·cm-1) ,精密度和选择性好 ,检出限低 ,适于天然水中痕量铜的测定