国内外常用降凝剂成分分析及性能表征

采用红外光谱法、凝胶色谱法、超导核磁共振波谱法、皂化滴定法以及气相色谱-质谱法等对国内外10种常用柴油降凝剂进行了成分分析,以寻找其成分对降凝剂性能的影响。结果表明:10种柴油降凝剂均属乙烯-乙酸乙烯酯聚合型降凝剂,样品聚合物部分相对分子质量较低,乙酸乙烯酯聚合物的质量分数一般在27%～37%之间,样品溶剂为重芳烃、以C₁₀为主的烷烃或者它们的混合物。其中,国外产品的相对分子质量较高（M_r>3 700）,乙酸乙烯酯聚合物质量分数大于30%,且溶剂添加了少量含氮类分散剂。     

中职“甲醇生产工艺”虚拟仿真教学实效的研究

把虚拟仿真实训系统引入中职化工专业必修课"甲醇生产工艺"教学,探究虚拟仿真实训系统对中职教学的作用。选取平行和实验班设计了传统、虚拟仿真2种教学方案,用虚拟仿真实训系统构建甲醇工业生产虚拟场景,模拟生产操作流程、控制、危险因素演示等,使学习者在无毒无害环境下轻松操作练习甲醇生产流程。结果显示虚拟仿真实训系统能有效弥补实训手段的不足,促进学生知识原理和操作过程的掌握,改善学习态度,有效提升学习兴趣和成就感,在提升学习效果和质量方面具有显著的促进作用。     

Effects of Substrate Temperature on Properties of Transparent Conductive Ta-Doped TiO_2 Films Deposited by Radio-Frequency Magnetron Sputtering

Ta-doped titanium dioxide films are deposited on fused quartz substrates using the rf magnetron sputtering technique at different substrate temperatures. After post-annealing at 550℃ in a vacuum, all the films are crystallized into the polycrystalline anatase TiO_2 structure. The effects of substrate temperature from room temperature up to 350℃ on the structure, morphology, and photoelectric properties of Ta-doped titanium dioxide films are analyzed. The average transmittance in the visible region(400-800 nm) of all films is more than 73%.The resistivity decreases firstly and then increases moderately with the increasing substrate temperature. The polycrystalline film deposited at 150℃ exhibits a lowest resistivity of 7.7 × 10~(-4)Ω·cm with the highest carrier density of 1.1×10~(21) cm~(-3) and the Hall mobility of 7.4 cm~2·V~(-1)s~(-1).     

Temperature-dependent optical properties of low-loss plasmonic SrMoO3 thin films

SrMoO₃(SMO) thin films are deposited on LaAlO₃ substrates by magnetron sputtering. The effects of ambient temperature on the structural, electrical, and optical properties of the films are investigated. As the temperature increases from 23°C to 800°C, the SMO film exhibits high crystallinity and low electrical resistivity, and the real part of dielectric functions becomes less negative in the visible and near-IR wavelength range, and the epsilon near zero(ENZ) wavelength in...