表面活性剂增敏阻抑反应动力学光度法测定痕量铂

研究了在硫酸介质中 ,在乳化剂 OP存在下 ,痕量铂 ( )阻抑溴酸钾氧化酸性品红褪色的新指示反应 ,建立了表面活性剂增敏阻抑反应动力学光度法测定痕量铂新方法。最大吸收波长为 5 44 nm。铂浓度在 0～ 2 .2 μg· L- 1范围内与ΔA呈线性关系 ,检测限为 0 .0 6 μg· L- 1。方法灵敏度高、选择性好、操作简便 ,用于抗癌药物顺铂及患者血清中铂含量的测定 ,取得较好的结果。     

Theoretical Calculation of Rotational Bands of ^179Pt in the Particle-Triaxial-Rotor Model

Theoretical calculations have been performed for nucleus ^179Pt in the particle-triaxial-rotor model with variable moment of inertia. The obtained energy spectrum agrees with the experimental data quite well. The calculated results indicate that the bands 1/2^- and 7/2^ are triaxial deformation bands and originate mainly from the v[521]1/2^- and v[633]7/2^ configurations respectively.     

Large Decay Rate Variation of ^7Be in Pd and Au

Platinum and gold have the similar crystal structure but different electronic affinities, as well as different effective electron densities near the implanted ions. Both the differences favour larger decay rate of ^7 Be in Pd than that in Au. We measured the variation of the decay rate of ^7Be implanted in Pd and Au host materials. We have found that the decay rate of ^7 Be in Pd is larger than that in Au by 0.8%.     

Pt-SDB疏水催化剂的研制

基于液相水-氢同位素催化交换的疏水催化剂研究已有近30年历史。从所报道的资料来看，目前用于重水提氚工艺中相转移的疏水催化剂主要集中在Pt-C-PTFE和Pt-SDB两类材料上。前者疏水性好，耐辐照稳定性好，后者催化活性好，但催化剂耐辐照稳定性稍差。拟在特制的SDB疏水材料上制备出催化活性好，性能稳定，满足使用要求的Pt-SDB疏水催化剂。     

三元混配铂(Ⅱ)配合物的稳定性和分子内芳环堆积效应研究

用 pH电位滴定法测定了铂 (Ⅱ )与核苷酸NTP (NTP为腺苷 5′ 三磷酸和尿苷 5′ 三磷酸 )和另一芳环系列配体ArL形成的三元混配配合物Pt(ArL) (NTP) n -(ArL =Phen ,Bpy和Trp ;n =2或 3)在水溶液中的稳定常数 (I=0 .1mol/L ,KNO3 ;2 5℃ ) .用ΔlogKPt比较了二元和三元混配配合物的稳定性差异 ,认为三元混配配合物稳定性的增加可归因于π 酸与π 碱之间的合作效应和分子内芳环配体的堆积作用     

高灵敏度化学光谱法测定金、铂和钯

三正辛胺负载泡塑对贵金属有极强的吸附能力。本文通过对三正辛胺负载泡塑对金、铂、钯吸附性能的研究，以及NO3^-和Fe^3 离子干扰的消除，拟定了金、铂、钯的快速、简便、富集系数高的三正辛胺负载泡塑分离法，一次摄谱的测定范围（10g样品）为：Au0.1-5000ng/g；Pt0.2-5000ng/g；Pd0.1-1000ng/g。     

Experimental Studies on Thermal and Electrical Properties of Platinum Nanofilms

We experimentally studied the in-plane thermal and electrical properties of a suspended platinum nanofilm in thickness of 15 nm. The measured results show that the in-plane thermal conductivity, the electrical conductivity and the resistance-temperature coefficient of the studied nanofilm are much less than those of the bulk material, while the Lorenz number is greater than the bulk value. Comparing with the results reported previously for the platinum nanofilm in thickness of 28 nm, we further find that the in-plane thermal conductivity, the electrical conductivity and the resistance-temperature coefficient decrease with the decreasing thickness of the nanotilm, while the Lorenz number increases with the decreasing thickness of the nanofilm. These results indicate that strong size effects exist on the in-plane thermal and electrical properties of platinum nanofilms.     

真空退火对L1_0-CoPt薄膜结构、磁性及表面形貌的影响

本文利用磁控溅射的方法制备了L1_0-CoPt薄膜,研究了不同退火条件对薄膜结构、磁性以及表面形貌的影响.通过优化退火温度、保温时间以及升温速率,制备出了具有大矫顽力、高矩形比、粗糙度小的垂直各向异性L1_0-CoPt薄膜.实验发现,较高的退火温度有利于克服CoPt薄膜有序化转变所需要的能量,同时适当延长退火时间可以提高CoPt薄膜的扩散系数,从而促使无序相fcc转化为L1_0有序相fct结构.此外,退火过程中减缓升温速率可以有效减小薄膜粗糙度,从而形成平整连续膜.     

Pt/Ti Electrodes of PZT Thin Films Patterning by Novel Lift-Off Using ZnO as a Sacrificial Layer

We achieve a successful novel lift-off of patterning Pt/Ti electrodes on SiO2/Si substrates by employing ZnO sacrificial layer deposition and patterning, successive uniform Pt/Ti deposition and final lift-off. Then we deposit PZT thin films on the electrodes. Compared with the conventional lift-off processes for the electrodes, this novel process does not need post-annealing, which must be performed after conventional lift-off process. It is demonstrated that the electrodes patterned by the novel lift-off process have stronger adhesion. The electrodes and the PZT films on the electrodes are more compact and smoother than those by the conventional lift-off process.     

新型抗肿瘤卡铂类衍生物的氢谱特征

卡铂是第二代铂类金属抗癌药物最重要的药物之一,广泛应用于临床. 为发现抗肿瘤活性更强的卡铂类药物,我们合成了6个新的卡铂类衍生物. 本文详细报道4个合成的新型卡铂衍生物的氢谱特征和归属. 