磁性Fe3O4纳米粒子用作靶向药物载体的制备及分析

Fe3O4 magnetic nanoparticles were prepared by the aqueous co-precipitation of FeCl3-6H2O and FeCl2-4H2O with addition of ammonium hydroxide. The conditions for the preparation of Fe3O4 magnetic nanoparticles were optimized, and Fe3O4 magnetic nanoparticles obtained were characterized systematically by means of transmission electron microscope （TEM）, dynamic laser scattering analyzer （DLS） and X-ray diffraction （XRD）. The results revealed that the magnetic nanoparticles were cubic shaped and dispersive, with narrow size distribution and average diameter of 11.4 nm. It was found that the homogeneous variation of pH value in the solution via the control on the dropping rate of aqueous ammonia played a critical role in size distribution. The magnetic response of the product in the magnetic field was also analyzed and evaluated carefully. A 32.6 mT magnetic field which is produced by four ferromagnets was found to be sufficient to excite the dipole moments of 0.05 g Fe3O4 powder 2 cm far away from the ferromagnets. In conclusion, the Fe3O4 magnetic nanoparticles with excellent properties were competent for the magnetic carders of targeted-drug in future application.     

甲基二氯硅烷-甲基乙烯基二氯硅烷-甲苯三元体系等压汽液平衡

Vapor-liquid euilibrium (VLE) for a ternary system of Methyldichlorosilane methylvinyldichlorosilane toluene and constituent binary systems were measured at 101.3kPa using a new type of magnetical pump-ebulliometer,The equilibrium conpositions of the vapor phase of binary systems were calculated indirectly from the total pressure-temperature-liquid composition(pTx).The experimental data were correlated with the Wilson and NRTL(non-random two liquid )equations.The parameters of the Wilson moldel were employed to predict the ternary VLE data .The calculated boiling points were in good agreement with the experimental ones.     

药用栀子的研究进展及展望

从药用栀子的植物来源、性状研究、药理研究、化学成分和药用价值等方面综述了其研究进展,着重从栀子化学成分方面入手详述了其有效成分的研究进展,并对其在临床医学上的应用前景作了展望.     

单羰基化反应催化剂Pd (PPh3)2Cl2的失活动力学研究

采用PAN为显色剂,通过分光光度法测定反应体系中催化剂Pd(PPh3)2Cl2的浓度,以探讨氯苄单羰基化合成苯乙酸反应中Pd(PPh3)2Cl2水解失活的动力学方程.结果表明,Pd2+与PAN显色的较佳条件为在10 mL 1～20×10-6Pd2+含量的溶液中,加入0.5 mL0.04%的PAN,在pH=3.0、40℃的水浴中加热30 min;其摩尔吸光系数e=1.384×104 L·mol-1·cm-1;Pd(PPh3)2Cl2水解反应对三苯基膦氯化钯浓度呈0.5级;对三苯基膦浓度呈-0.8级;对苯乙酸浓度呈2级;对碱中和剂NaOH的浓度呈1.2级.Pd(PPh.)2C12水解反应的活化能E=75.59 kJ·mol-1,指前因子为1.68×1012.     

以硝酸铵、氯化钾制取复混肥料的研究

一、前言近几年来,我国正在积极发展复混肥料。为了提高有效成份的浓度,降低生产成本,提高经济效益,我们进行了硝酸铵和氯化钾制取复混肥料的研究。试验结果表明,制取的复肥有效成分在30～40％,产品吸湿性小,不易结块,易于撒播,是一种性能比较优良的复混肥料。另外,可以副产硝酸钾。     

从铋冶炼浸渣制取三碱式硫酸铅的工艺研究 --硝酸浸出-流酸沉铅工艺的影响

通过对铋冶炼浸渣采用碳酸氢铵转化法合成三碱式硫酸铅的工艺研究,得出在硝酸浸出-硫酸沉铅工艺过程中影响铅回收率的主要因素为硝酸质量浓度.通过正交实验得出最佳的工艺参数为:硝酸质量分数为15%,沉铅温度为40℃,n(H2SO4):n(Pb)为1.2:1,沉铅时间为2.0 h,硝酸浸渣时间为1.5 h,硫酸质量分数为40%,n(HNO3):n(Pb)为3:1.此时,铅的回收率可达到99.25%,浸渣率为3%.     

国内氟硅橡胶的研究进展

介绍了氟硅橡胶的性质、应用状况以及国内的发展现状及动态，重点阐述了国内氟硅橡胶．尤其是氟硅橡胶配方（包括生胶、交联剂、补强剂、偶联刺、其它添加剂等）和加工工艺的研究开发进展．对目前存在的问题与发展方向提出了一些看法。     

汽液相平衡研究进展

概述了近年来汽液相平衡的测定方法:直接法(蒸馏法、静态法、流动法、循环法、泡露点法),间接法(饱和蒸汽压法、沸点仪法)和汽液相平衡计算方法(状态方程法和基团贡献法)的研究现状及其发展趋势,对其进一步的研究做了展望。     

焦化废水催化氧化处理的研究进展

焦化废水是一种氨氮和有机物浓度较高的难生物降解有机废水。笔者详细介绍了国内外近年来焦化废水催化氧化处理的几种方法,并进行了对比;对进一步的研究进行了展望。     

纳米γ-Fe2O3的制备方法及进展

从相态的角度概述了制备纳米γ-Fe2O3的各种方法:固相法、气相法-激光加热法、液相法(化学沉淀法、空气氧化法、溶胶-凝胶法、微乳液法、电化学法)的研究进展。阐述了各种方法的制备原理、特点及应用,介绍了制备纳米-γFe2O3的一些其它方法。并对纳米-γFe2O3的研究方向进行了展望。