肝脏肿瘤诊断和治疗双功能超声造影剂的制备及实验研究

目的探索载羟基喜树碱的聚乳酸微泡的制备及超声辐照下对肝脏肿瘤细胞生物效应的影响。方法采用DMSO溶解HCPT,使HCPT大部分以内酯环闭环形式存在,应用改良的乳化-溶剂挥发法,制备载羟基喜树碱的聚乳酸微泡。结果以载羟基喜树碱的聚乳酸微泡载药量和包封率分别达到1.69%和62.2%;超声介导下载药微泡5d累积释药量接近80%。结论通过改变载药方式,可以制备出抗肝脏肿瘤活性更高的药物制剂

Some Effects of Co on the Electrochromic Properties of NiO xH y Film

本文利用阴极化电沉积法在抛光镍板及ＩＴＯ玻璃表面制备了含Ｃｏ量为１６．２％的ＮｉＯｘＨｙ薄膜，薄膜厚度分别为４２ｎｍ、２１ｎｍ，采用透射光谱以及线性电位扫描、交流阻抗和阳极稳态极化曲线等测试技术，考察了Ｃｏ对ＮｉＯｘＨｙ薄膜电致变色性能的影响，光谱测试范围为３００～２５００ｎｍ．结果发现：Ｃｏ能降低薄膜着色态在可见光区及部分近红外区的透过率，通过电压调节不仅可以调光而且可望能够控温；同时Ｃｏ还能降低ＮｉＯｘＨｙ薄膜电致变色电位，升高薄膜氧化着色过程中的氧析出过电位，对薄膜的电致变色性能有改进作用，但降低了着色过程中质子的扩散系数．Some effects of Co addition upon the electrochromic characteristics of a nic_kel hydroxide film were studied. The films were electrodeposited on both polished Ni plate and conductive ITO glass. The electrochemical behaviors were investigated using the film on Ni plate by linear potential sweep, a.c. impedance, and anodic polarization curves for OER(oxygen evolution reaction). It was found that Co can lower the working voltage and raise the oxygen overpotential, but has little effect on the reaction kinetics. It was also found that the Co can improve the optical properties of the electrochromic film.作者联系地址：南开大学新能源材料化学研究所Author's Address: Inst. of New Energy Material Chem. Nankai Univ., Tianjin 30007

Oxygen Evolution Behavour on Ni Electrode in KOH Solution

用恒电流法测试在２２～７０℃之间电解３０ｗｔ．％ＫＯＨ水溶液时Ｎｉ阳极的稳态极化曲线以及该过程的交换电流密度ｉ０，Ｔａｆｅｌ斜率ｂ，传递系数β和不同电流密度下的析氧过电位随电解温度的变化关系结果发现：４０℃是各参量随温度变化的一个突出变点，４０℃以下，高过电位区的Ｔａｆｅｌ斜率达１２０ｍＶ以上，低过电位区的反应活化能Ｅａ为７９．８８ｋＪ／ｍｏｌ，而４０℃以上时，上述两参数分别为６０～７０ｍＶ和５５．３２ｋＪ／ｍｏｌ．另外两温度区间的（η／Ｔ）１及其随ｌｇｉ的变化也有显著差别The steady_state polarization curves of oxygen evolution were measured at temperatures between 22～70 ℃ on Ni electrode in 30 wt.% KOH solution by galvanostat methode. The exchange current densities, Tafel slopes and transfer coefficients were studied. It was found that 40 ℃ is a special temperature, near which the kinetic parameters change abrupdy. The Tafel slopes for oxygen evolution reactions at higher overpotentials change from more than 120 mV to about 70 mV when the temperature raises to 40～70 ℃ from 22～35 ℃. Simultaneously, the heat of activation is changes from 79.88 kJ/mol to 55.32 kJ/mol. Moreover, the -(η/Τ) i and how it changes with lg i are quite different in the two temperature ranges: The slope of -(η/Τ) i vs. lg i is 4.63 at the lower temperatures, while at the higher temperatures it is only -0.455.作者联系地址：南开大学新能源材料化学研究所Author's Address: Inst. of New Energy Material Chem. Nankai Univ. Tianjin 30007

The Effect of Co on the Proton Diffusion Coefficient for the Ni(OH)2 Electrodes

本文采用恒电位阶跃、循环伏安及恒电流放电法，考察含Ｃｏ量０％～５３％的Ｎｉ（ｏＨ）_２电极充放电过程中质子的扩散系数：充电过程该值为１０－９～１０－１０ｃｍ２／ｓ，放电过程则为１０（－１１）ｃｍ２／ｓ．数据处理时对文献中有关公式进行了修正．The diffusion coefficients of protons moving in the Ni(OH)2 electrodes have being investigated by constant current,cyclic voltammetry and potential step technineques.The electrodes were prepared by cathodic deposition and their active material contained 0～53% cobalt.It was found that the diffusion coefficients are about 10(-9)～10(-10) cm2/s during charging and about 10(-11) cm2/s during discharging.Moreover the value increases with the increacing content of Co in the electrodes.During the calculation,the relevant fomulars were modified especially the wrong fomular for constant current methode.作者联系地址：南开大学新能源材料化学研究所Author's Address: Institute of New Energy Material Chemistry,Nankai University,Tianjin 30007