Synthesis and thermodynamic properties of a metal-organic framework: [LaCu6(μ-OH)3(Gly)6im6](ClO4)6

A metal-organic complex, which has the potential property of absorbing gases, [LaCu₆(μ-OH)₃(Gly)₆im₆](ClO₄)₆ was synthesized through the self-assembly of La³⁺, Cu²⁺, glycine (Gly) and imidazole (Im) in aqueous solution and characterized by IR, element analysis and powder XRD. The molar heat capacity, C_p,m, was measured from T = 80 to 390 K with an automated adiabatic calorimeter. The thermodynamic functions [H_T − H_298.15] and [S_T − S_298.15] were derived from the heat capacity data with temperature interval of 5 K. The thermal stability of the complex was investigated by differential scanning calorimetry (DSC).     

聚合物锂离子电池阴极热复合聚集状态对电池性能的影响

制备了多层复合的聚合物锂离子电池 ,研究热压复合温度对电池性能的影响 .热压复合温度是聚合物锂离子电池生产中的一个关键控制参数 ,阴极片在合适的热压温度下 ,电池的性能较好 ;温度偏高或偏低都对电池不利     

甲基三氢集团的研究

本文通过FT-IR,溶解热和从头计算分子轨道法,对含三氢集团的分子(丙酮、乙酸甲酯、二甲基亚砜等)分子间的相互作用做了研究。在所研究的体系中,计算表明在甲基3个氢原子的中心方向有一个正电势区。它导致负电集团红外吸收带频率位移,溶解热的数据进一步说明三氢集团的集体效应。     

An empirical method for predicting detonation pressure of CHNOFCl explosives

This paper describes a new method for prediction of the Chapman-Jouguet detonation pressures of CHNOFCl explosives using the heat of detonation, Q_det, the number of moles of gaseous products of detonation per gram of explosive, α, and the average molecular weight of gaseous products, M. The equation has the form: P_CJ=15.88α(MQ_det)^1/2ρ₀²−11.17, where P_CJ is the Chapman-Jouguet detonation pressure and ρ₀ the loading density. Calculated P_CJ by this procedure show good result with respect to measured detonation pressure for any pure or mixture of ideal and some of less ideal CHNOFCl explosives at ρ₀>0.8 g/cm³.     

CoPy/C催化剂应用碱性介质氧还原催化的电化学性能

利用碳黑（Vulcan XC-72R）中加入硫酸钴和吡啶（Py）作为催化剂前驱体,经溶剂分散热处理构建了一类新型的高效氧还原CoPy/C复合催化剂.并运用循环伏安法（CV）和旋转圆盘电极（RDE）技术研究了不同Co含量的CoPy/C催化剂在碱性介质中对氧还原的电催化活性.结果表明:Co的存在对氧的催化剂活性位的形成有重要影响,800℃下所制备的10%Co30%Py/C（质量分数）复合催化剂表现出最佳的氧还原催化活性.以其制备的气体扩散电极在3.0 mol·L^-1KOH电解质溶液（O₂气氛）中0.014 V（相对于标准氧电极（RHE））即可产生明显的氧还原电流.同40%Py/C相比,10%Co30%Py/C催化氧还原的起峰电位正移了71 mV,同时表现出明显的极限扩散电流.在-0.16 V时电流密度达到最大值,电流密度为1.0 mA·cm^-2,半波电位在-0.07 V.透射电镜分析表明所制备的碳黑载吡啶钴（10%Co30%Py/C）催化剂平均粒径为20 nm.     

光谱法研究鸡蛋溶菌酶热变性与免疫原性的关系

利用圆二色性光谱和荧光光谱对鸡蛋溶菌酶的热变性过程进行了系统的光谱学研究,得到了鸡蛋溶菌酶热变性过程的光谱学特征;通过酶联免疫吸附实验测定鸡蛋溶菌酶热变性过程的免疫原性变化;结合生物信息学方法,分析了热变性过程中鸡蛋溶菌酶蛋白结构改变与其免疫原性变化之间的关系,建立研究食品过敏原蛋白热变性的光谱学方法.     

热处理对超疏水性含氟丙烯酸酯共聚物膜表面性能的影响

以微乳液聚合法和溶液聚合法制备丙烯酸全氟烷基乙基酯和甲基丙烯酸甲酯的共聚物, 以1,1,2-三氟三氯乙烷为溶剂, 采用溶剂挥发成膜法直接制备出超疏水膜, 并研究120 ℃热处理对超疏水膜表面性能的影响. 对于用乳液聚合方法制备的超疏水膜, 随着热处理时间的延长, 滚动角表现出先逐渐增大直至完全不能滚动, 然后重新回复到极小滚动角的特殊变化过程, 而静态接触角只是略微减小, 完全不同于热处理对平滑的含氟聚合物表面接触角的影响. 扫描电镜结果显示, 聚合物膜表面形貌对应出现从微/纳复合粗糙结构到微孔粗化并重新形成微/纳复合多层粗糙结构的变化.     

A review of heat treatment on polyacrylonitrile fiber

Developing carbon fiber from polyacrylonitrile (PAN) based fiber is generally subjected to three processes namely stabilization, carbonization, and graphitization under controlled conditions. The PAN fiber is first stretched and simultaneously oxidized in a temperature range of 200-300 °C. This treatment converts thermoplastic PAN to a non-plastic cyclic or a ladder compound. After oxidation, the fibers are carbonized at about 1000 °C in inert atmosphere which is usually nitrogen. Then, in order to improve the ordering and orientation of the crystallites in the direction of the fiber axis, the fiber must be heated at about 1500-3000 °C until the polymer contains 92-100%. High temperature process generally leads to higher modulus fibers which expel impurities in the chain as volatile by-products. During heating treatment, the fiber shrinks in diameter, builds the structure into a large structure and upgrades the strength by removing the initial nitrogen content of PAN precursor and the timing of nitrogen. With better-controlled condition, the strength of the fiber can achieve up to 400 GPa after this pyrolysis process.     

流体静压型机械密封的三维传热数学模型及端面温度分析

建立了静环倾斜时流体静压型机械密封的三维稳态传热模型,考虑流体黏度随压力、温度的变化,建立了压力、温度的控制方程,采用有限差分法,分析研究了倾斜量、结构参数及操作参数对机械密封温度分布的影响规律.结果表明,端面的最大液膜压力和最高温度随静环倾斜量的增加而增大,倾斜量越大,压黏效应越显著;端面温升受密封的结构参数、操作参数影响明显.静环端面锥角越大,温升越小;流体注入温度越低,温升越大;动环转速越高,温升越大.     

不同进风型式下气体冷却服中空气流动与换热的研究

根据气体冷却服的特点,对不同进风型式下气体冷却服中空气流动与换热进行研究。建立了进气口加设挡板层、进气口带均流器型和直吹型3种型式气体冷却服(服装夹层)中冷却空气流动过程的数学模型。对气体的流动过程进行分析,结果表明:不同的进风型式对气体冷却服空气层的温度分布状况、平均气流流速、平均温度、对流散热量影响较大;其中进气口加设挡板层的服装空气夹层温度分布最均匀,进气直吹型的平均气流流速最大,对流散热效果最好。研究结果为气体冷却服进一步的布风优化设计提供了理论和应用依据。