Excess and interaction second virial coefficients for seven binary gaseous systems

Excess and interaction second virial coefficients have been measured over the temperature range 293–321 K for the systems He-N₂, He-CO₂, He-N₂O, He-CH₄, He-SF₆, He-CF₄ and Ar-SF₆. The excess second virial coefficients B_E are estimated to have an accuracy of 0.3 cm³ mol^?1.     

模糊粗糙近似算子公理集的独立性

用双论域上的模糊关系定义了广义模糊粗糙近似算子,并讨论了近似算子的性质。用公理刻画了模糊集合值算子,各种公理化的近似算子可以保证找到相应的二元模糊关系,使得由模糊关系通过构造性方法定义的模糊粗糙近似算子恰好就是用公理定义的近似算子。讨论了刻画各种特殊近似算子的公理集的独立性,从而给出各种特殊模糊关系所对应的模糊粗糙近似算子的最小公理集。     

Pressure-Induced Transition from an Antiferromagnet to a Ferrimagnet for Mn(II)(TCNE)[C(4)(CN)(8)](1/2) (TCNE = Tetracyanoethylene)

Mn(II)(TCNE)[C(4)(CN)(8)](1/2) (TCNE = tetracyanoethylene) exhibits a reversible pressure-induced piezomagnetic transition from a low magnetization antiferromagnetic state to a high magnetization ferrimagnetic state above 0.50 ± 0.15 kbar. In the ferrimagnetic state, the critical temperature, T(c), increases with increasing hydrostatic pressure and is ～97 K at 12.6 kbar, the magnetization increases by 3 orders of magnitude (1000-fold), and the material becomes a hard magnet with a significant remnant magnetization.     

静电喷雾法制备高效染料敏化太阳能电池的二氧化钛光阳极

TiO2光阳极膜是染料敏化太阳能电池（DSSC）的核心部件之一,它对电池的光电转换效率起决定性作用．TiO2电极一般采用刮涂法和丝网印刷法制备．近3年,通过静电喷雾制备光阳极的方法得到国内外学者的关注．静电喷雾制备光阳极会受到多种因素的影响,如电压、流速、悬浮液浓度、喷雾距离以及喷雾时间等．但这些因素对成膜和DSSC器件性能的影响却没有得到全面的研究或者报道．本文使用静电喷雾法制备了多孔TiO2纳米膜,并研究了以其为电极的电池器件特性．经过超声充分分散的稳定TiO2乙醇悬浮液在高电压下喷雾到导电玻璃上成膜．通过改变电喷雾距离,得到了具有不同形貌的TiO：光阳极膜,并解释了其形成的机理及其对电池性能的影响．研究还表明,光阳极膜的TiC14处理能够很好地改善电池性能．通过优化,基于流速为0．8mL／h、电喷雾距离和时间分别为2．2cm和8min条件下制备的光阳极,结合TiC14处理,组装的电池在模拟太阳光源AM1．5G下光电转化效率达6．24％．     

利用辅助识别聚合物链制备牛血清白蛋白分子印迹聚合物

论文提出了一种新的蛋白质分子印迹方法, 即以聚乙烯醇接枝聚合物作为辅助识别聚合物链(ARPCs), 以丙烯酰胺为单体, 在丙烯酸酯树脂载体表面进行聚合, 制备牛血清白蛋白分子印迹树脂. 实验使用2.00 mol•L⁻¹氯化钾(KC1)溶液除去模板蛋白质, 使用十二烷基磺酸钠-聚丙烯酰胺凝胶电泳(SDS-PAGE)检测吸附蛋白质, 并设计使用0.150, 0.500和2.00 mol•L⁻¹KC1溶液分别对吸附蛋白质进行梯度洗提. 电泳实验结果表明, 2.00 mol•L⁻¹KC1溶液洗脱的蛋白质是大孔树脂的吸附效应; 0.500 mol•L⁻¹KC1溶液洗脱掉的是印迹蛋白质. 引入ARPCs制得的分子印迹树脂, 用于混合蛋白质体系吸附时, 对模板蛋白质的吸附量为80~100μg•g⁻¹, 其特异性吸附能力较未引入ARPCs之前有明显提高.     

Adsorption mechanism of carbon dioxide in faujasites: grand canonical monte carlo simulations and microcalorimetry measurements

Molecular simulations have been coupled with adsorption microcalorimetry measurements in order to understand more deeply the interactions between carbon dioxide and various types of faujasite surfaces. The modeling studies, based on newly derived interatomic potentials for describing the interactions within the whole system, provide isotherms and evolutions of the differential enthalpy of adsorption as a function of coverage for DAY, NaY, and NaLSX which are in very good accordance with those obtained experimentally. The microscopic mechanism of CO2 adsorption was carefully analyzed, with different behaviors proposed, depending on the energetic characteristics of each faujasite surface, which are consistent with the trends observed for the differential enthalpies of adsorption.     

溶胶-凝胶法合成Li1-xNaxMn2O4及其作为水系锂离子电池正极材料的电化学性能

用溶胶凝胶法合成了Na⁺离子掺杂的Li_1-xNa_xMn₂O₄(x=0,0.01,0.03,0.05)。X射线衍射图表明Na⁺取代Li⁺进入Li_1-xNa_x Mn₂O₄晶格中,扫描电镜图看出产物是粒径为100~300 nm的颗粒。恒流充放电测试结果表明,Li_0.97Na_0.03Mn₂O₄在2C倍率下循环100圈后放电容量保持率比未掺杂的LiMn₂O₄从51.2%提升到84.1%。循环伏安测试表明Na⁺离子掺杂降低了材料极化且增大了锂离子扩散系数。10C倍率下Li_0.97Na_0.03Mn₂O₄仍有79.0 mAh·g^-1的放电容量,高于未掺杂样品的52.1 mAh·g^-1。Na⁺离子掺杂可以稳定材料结构并提高锂离子扩散系数,从而提高LiMn₂O₄的电化学性能,是一种可行的改性方法。     

2011离子液体专题会议(Ⅲ)

关于离子液体界面性能的研究是一大热点。应用原子力显微术研究离子液体在云母,无定形二氧化硅等界面上的情况,发现其重排行列成类似固相,形成单个或数个分子层,约为纳米级厚度,其性能与离子液体主体大不相同。原子力显微术能提供有关离子液体薄涂层的界面性能的极具价值的信息。