3，3，3—三氟丙醛和3，3，3—三氟丙醛肟的制备

3,3a,4,6a-四氢环五烯并(?)唑-2-酮为手性中间体cis-5-氨基-2-环戊烯-1-醇的衍生物,作为重要的中间体可进行如下反应:     

Tb3+/Gd3+/Ce3+/Sb3+和Eu3+/Bi3+/Sb3+共掺玻璃的发光性能研究

为了得到显色改善的绿色和红色发光玻璃,本文采用高温熔融技术制备了Tb~(3+)/Gd~(3+)/Ce~(3+)/Sb~(3+)和Eu~(3+)/Bi~(3+)/Sb~(3+)共掺杂的硼硅酸盐透明玻璃。通过对共掺样品紫外可见吸收光谱的分析和长波紫外激发下的激发光谱及荧光光谱的分析,研究了Tb~(3+)/Gd~(3+)/Ce~(3+)/Sb~(3+)和Eu~(3+)/Bi~(3+)/Sb~(3+)共掺杂离子在玻璃基质中的发光性能,结果表明,在高能紫外光激发下,Tb~(3+)/Gd~(3+)/Ce~(3+)/Sb~(3+)共掺杂样品发射典型纯正绿光荧光的能力较强,Eu~(3+)/Bi~(3+)/Sb~(3+)共掺杂样品发射红光荧光的能力较强。     

2，3，3，3-四氟丙烯专利研究

欧洲指令2006／40关于汽车空调系统（MAC）规定在2011年1月1日后禁止使用GWP高于150的氟气体（F—gsses）,在距离此指令不到两年的时间中,正在开展关于替代HFC-134a（GWP：1300）制冷剂的激烈竞争。现在主要的替代制冷剂有HFC-152a、C02和2,3,3,3-四氟丙烯（HFO-1234yf,也称为HFC-1234）rf）。     

3，3，3-三氟丙基三甲氧基硅烷

西安工程大学的金小玲等人发现,以3,3,3-三氟丙基三氯硅烷和甲醇为原料、采用溶剂法合成3,3,3-三氟丙基三甲氧基硅烷的最佳工艺是：3,3,3-三氟丙基三甲氧基硅烷与甲醇的量之比为1：3．4～3．5,氮气流量为35mL／min,     

3，3，3-三氟丙烯制备方法综述

本文对3，3，3-三氟丙烯的制备方法以及各种制备方法中所用到的催化剂进行了较为详尽的总结。     

H_3BO_3对CaTiO_3:Eu~(3+)荧光粉发光性能的影响

采用高温固相法合成了Eu~(3+)掺杂钛酸钙系列红色荧光粉(Ca_(0.95)TiO_3:0.05Eu~(3+),CTE),研究了助熔剂(硼酸)用量(0%、5%、10%、15%)对其晶体结构与光学性能的影响。XRD和SEM表明,硼酸用量对主晶相晶体结构影响较小,当硼酸用量为5%时,晶体结晶性能最佳;光学性质研究表明,合成的CTE荧光粉可被397nm的紫外光有效激发,辐射出位于594 nm和615 nm的红色光波;当硼酸用量为5%时,辐射光波的强度达到最大值,表明合适的硼酸用量有助于提高CTE荧光粉的发光性能。     

Ba3Tb(BO3)3:Eu3+的制备与发光性质

采用高温固相法合成了Ba3Tb(BO3)3:Eu3+红色荧光粉,并研究了Ba3Tb(BO3)3:Eu3+的发光特性。Ba3Tb(BO3)3:Eu3+的激发光谱包含250nm～330nm和350nm～400nm的2个宽带,最大峰值位于383nm,可以被紫外-近紫外发光二极管(light-emitting diodes,LED)有效激发。Ba3Tb(BO3)3:Eu3+的发射谱显示出4组发射峰,其主发射峰位于620nm,对应Eu3+的5D0→7F2跃迁;Eu3+掺杂摩尔分数为2%时,Ba3Tb(BO3)3:Eu3+发光亮度最高。经分析发现Ba3Tb(BO3)3:Eu3+存在Tb3+→Eu3+的能量传递。     

3，3-二乙氧基丙腈

3,3-二乙氧基丙腈是合成维生素B1、胞嘧啶及其衍生物等重要化合物的前体。综述了3,3-二乙氧基丙腈的合成方法,包括酰胺脱水、金属氰化物取代、醚化和异噁唑法,用于工业化生产较为满意的合成路线是以1,1,3,3-四乙氧基丙烷为原料的异噁唑法。     

X70管线钢在CO2-3/HCO-3体系中表面膜性能研究

The electrochemical behavior of X70 pipeline steel in (0.5mol·L-1 Na2CO3+1 mol·L-1 NaHCO3) solution was studied by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM) were used to analyze the composition and microstructure of the surface film. The results showed that there were two anodic peaks at -600 mV and -350 mV. The surface film formed at -600 mV mainly consisted of ferrous carbonates and ferrous hydroxycarbonates. It had a small reaction resistance. It was metastable and possessed poor protective property. Numerous pits and microcracks existed on the film, which could be the active paths for the initiation of stress corrosion cracking. The surface film formed at -350 mV, mainly consisted of ferric oxides. It has high reaction resistance and offered good protection for the substrate.     

环丙沙星、诺氟沙星、氧氟沙星在1 mol·L~(-1) HCl中对碳钢的缓蚀性能及机理研究(英文)

The inhibiting effect of ciprofloxacin,norfloxacin and ofloxacin on the corrosion of mild steel in 1 mol·L-1 HCl and the mechanism were studied at different temperatures using mass loss measurement,electrochemical method,and X-ray photoelectron spectroscopy(XPS) .Effective inhibition was shown by mass loss,potentiodynamic polarization and impedance spectroscopy measurement.The corrosion rate of the metal in the mass loss measurement,and the corrosion reaction on cathode and anode in the electrochemical measurement were accelerated when temperature was increased.XPS results showed that the inhibitors adsorbed effectively on the metal surface.     

电化学法制备纳米TiO_2聚邻甲苯胺复合膜

用 3mol·L- 1 酸作为介质 ,扫描速度为 10 0mV·s- 1 ,扫描电位为 - 0 1～ 0 8V ,用循环伏安法在纳米二氧化钛 (Nano TiO2 )膜电极上实现了邻甲苯胺 (o MA)的电化学聚合 ,并对制得Nano TiO2 聚邻甲苯胺 (P -o MA)复合膜的电化学性质进行了研究。结果表明 :在峰电位 (Ep)为 0 .5 6V处有一个明显的氧化峰 ,在Ep 为 0 .5 8、0 .30和 - 0 .0 4V处分别有一个还原峰 ,经长时间扫描 ,氧化峰电流可达到 5 0A·dm- 2 以上 ,具有工业应用价值。同时实验也表明 ,复合膜的生成、Ip 和Ep 的大小受溶液浓度、扫描速度 (v)以及扫描电位的影响     

聚吡咯-酰基吡唑啉酮复合膜修饰玻碳电极测定酚磺乙胺的研究

报道了一种新型聚吡咯-酰基吡唑啉酮复合膜修饰玻碳电极(Ppy/HPMαFP/GCE)对酚磺乙胺(ETH)电化学性质及其反应机理的研究。酚磺乙胺的电化学性质检测运用循环伏安法和脉冲伏安法。实验表明,与裸GCE和Ppy/GCE相比,Ppy/HPMαFP/GCE修饰电极对酚磺乙胺有良好的催化作用。聚吡咯与酰基吡唑啉酮产生了协同增效作用。在pH=5.5的磷酸盐(PBS)缓冲溶液中,该修饰电极测试ETH的CV曲线于0.35V和0.4V出现一对灵敏的氧化还原峰,峰电位差△Ep较裸玻碳电极降低510mV,比Ppy修饰电极降低100mV,峰电流显著增加。在最佳条件下,氧化峰电流与ETH浓度于2.0×10-6~1.0×10-4mol.L-1范围内呈现良好的线性关系,检出限为6.0×10-7mol.L-1。     

酰基吡唑啉酮与聚吡咯修饰玻碳电极电化学氧化氧氟沙星的行为

制得一种复合膜修饰玻碳电极HPMαFP/Ppy/GCE(HPMαFP:1-苯基-3-甲基-4-(α-呋喃甲酰基)-5-吡唑啉酮,/Ppy:聚吡咯,GCE:玻碳电极)。通过循环伏安法(CV)和脉冲伏安法(DPV)研究了氧氟沙星(OFL)在电极上的电化学行为。该修饰电极显现特定的测定氧化峰电流和高检测灵敏度。在pH=7,扫速为100mV·s-1的条件下,测试OFL的CV曲线于Ep=0.88 V出现一不可逆的氧化峰。氧化峰电流与OFL浓度在2.0×10-6~1.0×10-4mol·L-1范围内呈良好的线性关系。检出限为6.5×10-8mol·L-1。     

An efficient corrosion inhibitor of cassava starch graft copolymer for aluminum in phosphoric acid

Starch is one of the richest natural polymers with low-cost,non-toxic and biodegradable,but is seldom directly used as corrosion inhibitor due to its poor inhibitive ability and low water solubility.To solve this problem,cassava starch-acryl amide graft copolymer (CS-AAGC) was prepared through grafting acryl amide (AA) with cassava starch (CS),and it was firstly examined as an efficient inhibitor for 1060 alu-minum in 1.0 mol·L-1 H3PO4 media.The adsorption behavior of CS-AAGC and its electrochemical mech-anism were investigated by weight loss and electrochemical methods.Additionally,the inhibited aluminum surface was fully characterized by a series of SEM,AFM,contact angle measurements and XPS.Results confirm that CS-AAGC performs better inhibitive ability than CS,AA or CS/AA mixture,and the maximum inhibition efficiency of 1.0g·L-1 CS-AAGC is 90.6％ at 20 ℃.CS-AAGC acts as a mixed-type inhibitor while mainly retards the anodic reaction.EIS has three time constants,and the polarization resistance is significantly increased in the presence of CS-AAGC.The micrograph of inhibited aluminum surface is of hydrophobic nature with low surface roughness and little corrosion degree.     

酰基吡唑啉酮配合物-玻碳复合修饰电极测定甲基苯酚的研究

制备了一种新型复合膜修饰电极[GdL3(HL)]·H2O(HL=1-对甲苯基-3-甲基-4-(α-呋喃甲酰基)-5-吡唑啉酮)/聚2,2-联吡啶(Pbpy)/玻碳电极(GCE)。运用循环伏安法(CV)和脉冲伏安法(DPV),研究了电极对食品添加剂2,6-二叔丁基-4-甲基苯酚(BHT)的电化学反应与机理。与裸电极和Pbpy/GCE相比,新修饰电极测定BHT的氧化峰电流和灵敏度均显著提高。在pH=5.0,该修饰电极测试的CV曲线于Ep=0.212V处出现一个灵敏的氧化峰。峰电位差△Ep较GCE、Pbpy/GCE分别降低400mV、42mV,峰电流明显增加。在最佳条件下,氧化峰电流与BHT浓度于6.0×10-6~2.0×10-4mol·L-1范围内呈现良好的线性关系,检出限为1×10-8mol/L。     

3D Prussian blue/Pt decorated carbon nanofibers based screen-printed microchips for the ultrasensitive hydroquinone biosensing

Nowadays,water pollution has become more serious,greatly affecting human life and healthy.Electrochemical biosensor,a novel and rapid detection technique,plays an important role in the real-time and trace detection of water pollutants.However,the stability and sensitivity of electrochemical biosensors remain a great challenge for practical detections in real samples to the strong interferences derived from complex components and coagulation effects.In this work,we reported a novel three-dimensional architecture of Prussian blue nanoparticles (PBNPs)/ Pt nanoparticles (PtNPs) composite film,using 3D interweaved carbon nanofibers as a supporting matrix,for the construction of screen-printed microchips-based biosensor.PtNPs with diameters of～2.5 nm was highly dispersed on the carbon nanofibers (CNFs) to build a 3D skeleton nanostructure through a solvothermal reduction.Subsequently,uniform PBNPs were in-situ self-assembled on this skeleton to construct a 3D architecture of PB/Pt-CNF composite film.Due to the synergistic effects derived from this special feature,the as-prepared hydro-quinone (HQ) biosensor chips can synchronously promote both surface area and conductivity to greatly enhance the electrocatalysis from enzymatic reaction.This biosensor has exhibited a high sensitivity of 220.28 μA·L·mmol-1·cm-2 with an ultrawide linear range from 2.5μmol·L-1 to 1.45 mmol·L-1 at a low potential of 0.15 V,as well as the satisfactory reproducibility and usage stability.Besides,its accuracy was also verified in the assays of real water samples.It is highly expected that the 3D PB/Pt-CNF based screen-printed microchips will have wide applications in dynamic monitoring and early warning of ana-lytes in the various practical fields.     

MFC聚苯胺碳纳米管阳极电化学法制备及其性能

引言经济的高速可持续发展,迫切需要新能源和可再生能源的研究和开发。而微生物燃料电池(MFC)是利用电化学方法将微生物代谢能转化为电能的一种新型能源技术[1]。虽然MFC功率密度和输出电压近年来有了很大提高,但和普通氢燃料电池相比,MFC的库仑效率和输出功率都较低,实现MFC技术的商业化应用还需要多方面技术研     

杯芳烃衍生物修饰电极的电化学性能研究

采用5,11,17,23-四叔丁基-25,27-二羟基-26,28-二(乙氧羰基甲氧基)杯[4]芳烃(酯-杯[4]芳烃)-PVC膜修饰玻碳电极,研究了其对Pb2+的电化学行为。研究表明:该修饰电极在碱性条件中为不可氧化过程,在酸性条件下具有良好的电化学活性,对Pb2+具有很高的响应,在3.65×10-6～4.83×10-3mol.L-1范围内线性扫描溶出伏安峰电流与Pb2+浓度具有良好的线性关系,检测限为1.28×10-6mol.L-1。