聚四氟乙烯/碳纤维增强聚酰亚胺复合体系的摩擦学性能

研究评价了不同PTFE含量的碳纤维增强P1复合材料的力学和摩擦学性能，并分析了在干摩擦和水润滑2种不同条件下的磨损表面形貌和磨损机理。研究表明：PTFE以10%添加时PI/CF/PTFE体系的机械性能最佳，而摩擦学性能以5%添加为佳；随PTFE含量的增加，复合材料的摩擦系数降低，磨损率增加。水润滑下，摩擦系数和磨损率比干摩擦下的都有相应的降低。干摩擦下，材料的磨损均以塑性变形、微观破裂及破碎为主导；水润滑下，这一机制显著减弱，归因于水的润滑和冷却作用。     

活性炭吸附法脱除加氢催化柴油中的硫化物

采用5种活性炭对加氢催化柴油进行吸附脱硫,通过对活性炭的吸附效果及工艺参数的研究,探索了活性炭吸附脱硫最适宜的工艺条件。实验结果表明,分别选用比表面积为854.97,1 108.61 m2/g,相应微孔平均孔径为0.581 4,0.627 4 nm的活性炭,在粒度为40~80目,流速为0.25 mL/m in,吸附柱高径比为30/1的条件,可将不同原料油中有机硫含量分别从1 354.96,665.50μg/g降至360.40,69.61μg/g,脱硫率分别为73.40%和89.54%;在20~100℃时,随着温度的升高,活性炭吸附脱硫效果增强。     

Adsorption of H2S or SO2 on an activated carbon cloth modified by ammonia treatment

The aim of this research is to investigate how ammonia treatment of the surface can influence the activity of a viscose-based activated carbon cloth (ACC) for the oxidative retention of H₂S and SO₂ in humid air at 25 °C. Surface basic nitrogen groups were introduced either by treatment with ammonia/air at 300 °C or with ammonia/steam at 800 °C. The pore structure of the samples so prepared was examined by adsorption measurements. Changes in the surface chemistry were assessed by X-ray photoelectron spectroscopy, X-ray absorption spectroscopy and temperature programmed desorption (TPD). The change of ACC activity could not be merely attributed to surface nitrogen groups but to other changes in the support. Ammonia/steam treatment improved ACC performance the most, not only by introducing nitrogen surface groups, but also by extending the microporosity and by modifying the distribution of surface oxygen groups. Successive adsorption-regeneration cycles showed important differences between oxidative retention of H₂S and SO₂ and the subsequent catalyst/support regeneration process.     

Effect of Substrate Bias on Microstructure and Properties of Tetrahedral Amorphous Carbon Films

The microstructure and properties of tetrahedral amorphous carbon (ta-C) films deposited by the filtered cathodic vacuum arc technology has been investigated by visible Raman spectroscopy, AFM and Nano-indentor. The Raman spectra have been fitted with a s     

纳米材料的力学性能

综述了纳米晶体材料和纳米碳管材料的力学性能研究的最新进展。实验数据表明纳米晶体材料的强度与其晶粒尺寸大小的关系并不遵循Hall-Petch方程。相对于常规晶体材料 ,纳米材料的超塑性发生在更低的温度和更高的应变速率下。理论计算和实验数据表明 :纳米碳管是一种有着高刚性、高强度、高韧性和低密度的材料。纳米晶体材料和纳米碳管的异常的力学性能已经有了一些应用实例     

含氮杂环季铵盐缓蚀剂在CO2-3%NaCl溶液体系中的电化学行为

为控制CO2腐蚀，合成了含氮杂环季铵盐缓蚀剂9912-1，通过电化学实验，研究了该缓蚀剂在CO2-3％NaCl-H2O体系中对碳钢于25℃和90℃下的缓蚀行为。实验结果与挂片失重法测试的结果基本一致。低温下缓蚀效果优于高温下的缓蚀效果。而且该缓蚀剂与硫脲有很好的协同效应。Tafel曲线表明，该缓蚀过程是以控制阴极腐蚀为主，并对其缓蚀机理进行了初步探讨。     

膜-粉末炭反应器净化微污染源水

采用膜-粉末炭反应器处理微污染源水的试验结果表明,该工艺对水中的有机物具有较好的净化效果,在水温《10℃的条件下,处理可生化性很低的三家店水库水时对CODMn的去除率仍保持在65%左右;工艺对CODMn、UV254、UV410的去除效果依次增强.