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Solid Phase Extraction of Cadmium in Edible Oils Using Zinc Piperazinedithiocarbamate and Its Determination by Flame Atomic Absorption Spectrometry
Solid Phase Extraction Edible Oils Using Zinc Piperazinedithiocarbamate Its Determination
2010/4/16
A method was developed for preconcentration of cadmium with zinc-piperazinedithiocarbamate (ZnPDC) in edible oils and its determination by flame atomic absorption spectrometer (FAAS). The preconcentra...
Preparation of 1,5-Diketones by Addition of Cyclohexanone to Chalcones under Solvent-free Phase Transfer Catalyst Condition
Chalcones 1,5-Diketones Solvent-free Phase Transfer Catalyst Michael Addition
2010/4/16
Eight different chalcone-1,5-diketone derivatives (5a-h) were prepared by the reaction of chalcone derivatives (3a-h) with cyclohexanone under the solvent-free phase transfer catalyst condition with m...
介孔空心球状WC微球结构与晶相形成机理（Structure and Crystal Phase Formation Mechanisms of Hollow Global Tungsten Carbide (WC) Microsphere with Mesoporosity）
介孔 空心球状 碳化钨 微球 形成机理
2010/8/18
采用喷雾干燥微球化处理-气固反应法制备了介孔空心球状WC微球，应用扫描电子显微镜(SEM)对微球的形貌变化进行了表征。结果表明，介孔空心球状结构是逐步形成的。其中，空心球状结构形成于前驱体微球化处理过程中，介孔结构形成于空心微球还原碳化过程中。在与样品制备工艺条件相同的情况下，采用原位X射线衍射技术(in situ XRD)对样品的晶相演变规律进行了监测。结果表明，样品在CO/CO2气氛中进行还...
氟化钾团簇的相变、成核和重结晶的分子动力学模拟（Molecular Dynamics Simulation of Phase Transition， Nucleation， Recrystalization of KF Clusters）
分子动力学模拟 相变 成核 重结晶 氟化钾团簇
2010/8/24
我们利用Born-Mayer-Huggins相互作用势函数对(KF)N(N=108，256，500和864)团簇进行了分子动力学(MD)模拟。为了避免周期性边界条件对相变、成核和重结晶的干扰作用，对体系采用了自由边界。基于MD模拟结果，对团簇的熔化温度、熔化焓、扩散系数、成核速率、固液界面自由能、临界核大小等进行了计算和讨论。在对(KF)864双晶团簇的热退火模拟中，观察到了固态的重结晶和晶粒的生...