Sensitizing Effect of Mixed Surfactants on the Colouration of Scandium(Ⅲ)with Phenylfluorone or Its Derivatives

In the presence of mixed micelle of a cationic and a nonionic surfactants,the reaction of scandium(Ⅲ)with phenylfluorone or its derivatives results in a very sensitive colouration:furthermore this chromophoricsystem tolerates the existence of a considerable amount of masking agents,so that many interfering ions can bemasked and its selectivity would be further improved.After studying the optimum conditions and main charac-ters of some similar systems,the system of Sc(Ⅲ)—Orthonitrophenyuorone—CetyltrimethylammoniumBromide(CTMAB)—Triton X-200 is chosen for the spectrophotometric determination of microamount ofscandium.The proposed method shows not only high sensitivity(with a molar absorptivity of 2.12×1~sLmol~(-1)·cm~(-1))and selectivity,but also high tolerance of chromophoric conditions.Beer's law is obeyed over arange of 0～6.0 μg Sc/25ml.If the dual-wavelength method is applied,a much higher molar absorptivity o|"3.04×10~5L·mol~(-1)·cm~(-1)than those of other systems ever reported in the literatures can be attained:more-over.its linear range is extended to 0～8.0 μg Sc/25ml and its reproducibility is also improved.     

Extraction-chromatographic Separation of Microamount Scandium(Ⅲ)with HEH(EHP) Resin and Its Analytical Application

The optimum conditions for the extraction-chromatography by using 2-ethylhexyl-2-ethylhexyl-phosphonate resin to separate scandium(Ⅲ)from large amounts of other metal ions were reported.A me-thod for the separation and determination of microamount of scandium has been developed.This methodgives higher accuracy and reproducibility than solvent extraction with PMBP,especially,for the samplescontaining high content of titanium.Many shortcomings of other methods ever reported can be overcomeby the present method.     

流动相的pH值及配比对分析物保留时间的影响

以苯甲酸，水杨酸，氨甲苯酸，对氨基水杨酸，乙酰水杨酸的分离测定为例，探讨了甲醇水流动相中ｐＨ值及甲醇的体积分数φ对分析物保留时间的影响。提出了响应系数和平均响应系数的概念，通过建立反映各参数变化的数学模型，预测物质保留时间，洗脱顺序及分离效果，选择最佳洗脱条件。     

适合产业化的显示屏化学减薄工艺的研究

超薄显示技术已成为市场的一种主流趋势。本文利用刻蚀后清洗的间歇式工艺研究了显示屏半成品的化学减薄。在光刻胶和边框胶保护下,调整氢氟酸浓度,加入一定量的硝酸、浓硫酸和盐酸,并添加超声辅助条件,刻蚀速率明显提高。通过交替的清洗工艺有效地降低了表面粗糙度,并减少了表面白色附着物的沉淀。显示屏厚度从0.8mm减薄到0.3mm,基板表面粗糙度为11.32nm,厚度均匀性为4.76%。设计的间歇式减薄工艺可以应用到现有的显示屏生产工艺中,为制作超薄液晶显示屏和超薄有机发光显示屏提供了一条可行的方案。     

异质诱导生长的酞菁铜薄膜晶体管的研究

因酞菁薄膜平面具有多电子共轭大π键结构,本文采用异质诱导的方式对酞菁薄膜的生长特性进行了改善研究。采用高掺杂硅为栅极,氧化硅为绝缘层,生长α-四噻吩或p-六联苯薄膜为异质诱导层,制备了酞菁铜有机薄膜晶体管。利用原子力显微镜研究薄膜生长特性,并对比研究了2种诱导层对薄膜晶体管性能的影响。实验结果表明:α-四噻吩上生长的酞菁铜薄膜,形貌呈片状,而p-六联苯上生长的酞菁铜薄膜,形貌呈针状,均与单层酞菁铜棒状形貌不同。同时,α-四噻吩与p-六联苯薄膜上生长酞菁铜后,两者晶体管电性能都有不同程度的提高,均比单层酞菁铜提高了1~2个数量级,表明α-四噻吩或p-六联苯对酞菁铜薄膜均有诱导效应,可以获得高性能的有机薄膜晶体管。     

离子选择电极测定矿石中微量金

本文报道了富集后用氧化剂转型,以金离子选择性电极测定矿石中微量金,灵敏度及准确度均令人满意。 一、仪器及试剂 溴代十六烷基吡啶PVC膜金离子选择性电极(Au—ISE):以饱和氯化钾为内充液,10~(-3)mol/L氯络金酸(0.5mol/L盐酸介质)为浸泡液。 TOA-TBP聚氨酯泡沫塑料:泡沫塑料小块(每块约0.2g),放入三辛胺(TOA)与磷酸三丁酯(TBP)的1∶4混合液中,挤去气泡后取出,用滤纸压干。