Tungsten hexacarbonyl and hydrogen peroxide as precursors for the growth of tungsten oxide thin films on titania nanoparticles

W(CO)₆ and H₂O₂ were used in an atomic layer deposition (ALD)‐like process to grow thin WO_x films onto TiO₂ powders in a fluidized bed reactor. Carbonyl precursors are not widely used in this application, so that deviations from an ideal ALD process, previously not examined with W(CO)₆, were identified. The resulting WO_x films were a result of both ALD‐like and chemical vapor deposition‐based growth modes. A chemical reaction mechanism incorporating a combination of these two growth modes was inferred. As the move to expand the range of ALD precursors meets with the desire to scale up these processes, the simultaneous appearance of both these growth modes is likely to become more and more common, and so understanding the interaction of these two types of surface reactions is key to progress in the field. The films were observed to inhibit the anatase‐to‐rutile phase transformation in the TiO₂ powders upon high temperature annealing, while crystallization of the amorphous WO₃ was also not observed. Changes in the local bonding within the WO₃ were observed and associated with changes in the structural nature of the film and its interface to the substrate. © 2014 American Institute of Chemical Engineers AIChE J, 60: 1278–1286, 2014     

TFT玻璃基板中的铂金粒子研究

通过分析玻璃基板制造中存在的铂金粒子的产生机理,为玻璃基板制造中控制铂金粒子的产生提供参考依据,从而降低玻璃基板生产中铂金粒子的发生率。     

碳纳米管吸附的电纺PA66纤维束

采用超声的方法将多壁碳纳米管(MWNTs)超声到静电纺丝聚酰胺66(PA66)纤维上。通过扫描电子显微镜(SEM)、力学性能测试以及万用电阻表来表征超声前后纤维束的形貌、力学性能以及超声处理后纤维束的电阻。结果表明,经超声处理后MWNTs均匀地附着在纤维表面,纤维束的强度及韧性均有明显的提高,纤维束的电阻分布在150~230 kΩ,极优的导电性表明MWNTs在纤维表面分布均匀,这同时也说明碳管与PA66纤维之间具有较强的界面相互作用。     

1,4-丁二醇提取玉米芯木质素的研究

以1,4-丁二醇为溶剂提取玉米芯中的木质素,考察了反应温度、原料／溶剂固液比（g/mL）、1,4-丁二醇的质量分数、反应时间等因素对木质素收率的影响。最佳萃取条件为：反应温度200℃,固液比（g／mL）1：10,1,4-丁二醇的质量分数90％,反应时间1h,以少量硫酸作为催化剂,木质素收率37．03％。红外光谱分析结果表明,1,4．T-醇提取的玉米芯木质素较好地保存了木质素原有结构。     

国产络合铁法液相氧化还原硫磺回收脱硫溶剂研究及工业应用

通过实验室模拟性质和组成相似的炼油厂酸性气,在类似于LO-CAT硫磺回收装置工艺操作条件下,对国产络合铁法液相氧化还原催化剂进行了适应性研究。在陕西延长石油(集团)有限责任公司炼化公司延安炼油厂LO-CAT硫磺回收装置进行了工业试用,结果表明,国产络合铁法液相氧化还原催化剂完全可以替代国外专用脱硫溶剂,净化后尾气硫化氢平均含量3.2×10-6,硫回收率大于99.95%,每吨硫磺加工成本降低10%,各项技术经济指标均优于进口脱硫溶剂。     

关于改进烧碱装置树脂塔再生控制的设想

离子膜法烧碱生产工艺中使用螯合树脂处理盐水,树脂塔再生周期一般固定为24 h,与负荷无关。本文设想采用树脂塔实际处理的盐水量来决定树脂塔开始再生的时间,以使在低负荷情况下,树脂的交换容量也得到充分利用,减少不必要的再生。     

G115钢管埋弧自动焊焊缝冲击性能不足的原因分析及热处理修复措施

采用埋弧自动焊(SAW)对大口径厚壁G115钢管进行焊接,焊后经785℃回火后发现焊缝冲击吸收能量低于标准要求的最低值。通过对焊接方法、焊材及回火温度的分析和试验表明,焊缝的回火温度超出了熔覆金属的Ac₁点,产生不完全相变组织,且碳化物回溶、沉淀强化作用减少、马氏体亚结构和位错密度降低、析出相长大粗化等多种因素的交互作用最终造成了焊缝冲击性能的下降。采用1080℃×3 h正火+770℃×6.5 h回火的热处理修复后,焊缝的冲击性能得到大幅度的提升。     

Sn改性Ti-Zr-Cu-Ni钎料的微观组织和力学性能

采用自制Ti-Zr-Cu-Ni-Sn钎料钎焊TA2钛合金,研究了不同Sn元素含量改性Ti-Zr-Cu-Ni钎料的熔化特性、微观组织及物相、润湿及熔蚀性、接头拉伸强度。研究表明,Sn含量增加,Ti-Zr-Cu-Ni-Sn钎料固、液相线温度基本升高,但温度差值基本变窄,可更好地抑制钎焊界面脆性化合物形成。Ti-Zr-Cu-Ni-5Sn钎料组织由Ti、Zr基体和晶体相构成,Sn倾向与Ti、Zr结合形成Ti₂Sn₃、Ti₆Sn₅、Zr₅Sn₃等低熔点共晶相。Sn≤1.5%时,随Sn含量增加,钎料对TA2钛合金的润湿性逐渐变差;继续增加Sn,钎料润湿性改善,添加5%Sn的钎料对基体润湿最佳。添加5%Sn并降低Cu、Ni总量的改性钎料对TA2钛合金熔蚀减弱。相同钎焊工艺下,添加5%Sn接头的强度和塑性均有提升。钎焊温度升高,Ti-Zr-Cu-Ni钎料产生更多强化物相,致接头强度大幅提升,而Ti-Zr-Cu-Ni-5Sn钎料产生的含Sn物相强化作用对接头强度提升有限;相...     

Synthesis of [60]Fullerene‐Fused Tetralones via Palladium‐ Catalyzed Ketone‐Directed sp2 C?H Activation and sp3 C?H Functionalization

The palladium‐catalyzed ketone‐directed dual sp² C H activation and sp³ C H functionalization has been applied for fullerene functionalization for the first time. The sec‐alkyl aryl ketones have been exploited to react with [60]fullerene (C₆₀) to provide the novel and scarce C₆₀‐fused tetralones. The combined use of a highly active cationic palladium(II) catalyst and trifluoromethanesulfonic acid is crucial for the improvement of the reaction yield. A plausible reaction mechanism leading to the observed products has been proposed, and the electrochemistry of the fullerene products has also been investigated.

     

45钢与QT450-10的表面耐腐蚀处理工艺及性能研究

针对注塑机零件中常用的材料45钢和QT450-10,采用未经热处理的模拟试样,分别进行两组不同工艺参数的软氮化及磷化（发黑）和浸涂防锈油等处理方式。最后使用中性盐雾腐蚀试验评估各试样获得的耐腐蚀性能。研究表面：采用相同的表面处理工艺,45钢的耐腐蚀性能优于QT450-10;QT450-10未经磷化（发黑）处理,无论是否浸涂防锈油,表面耐腐蚀性均很差。