The fabrication and structure characterization of a self-assemble film were reported.An orderded layer structure ultrathin film was formed by alternative deposition of poly(sodium 4-styrenesulfonate)as polyanion and b...The fabrication and structure characterization of a self-assemble film were reported.An orderded layer structure ultrathin film was formed by alternative deposition of poly(sodium 4-styrenesulfonate)as polyanion and benzidine dihydrochloride as cationic compounds.UV-visible absorption spectrum,contact angle measurement and ellipsometry measurement were conducted to characterize the film.展开更多
采用NaBH4作为还原剂还原HAuCl4的方法,将阴离子聚电解质即聚丙烯酸(PAA)作为保护剂,成功制备了稳定性非常好的小粒径金纳米粒子.分别采用紫外 可见 近红外光谱仪(UV vis NIR)、透射电子显微镜(TEM)、光电子能谱仪(XPS)、X射线衍射仪(X...采用NaBH4作为还原剂还原HAuCl4的方法,将阴离子聚电解质即聚丙烯酸(PAA)作为保护剂,成功制备了稳定性非常好的小粒径金纳米粒子.分别采用紫外 可见 近红外光谱仪(UV vis NIR)、透射电子显微镜(TEM)、光电子能谱仪(XPS)、X射线衍射仪(XRD)和电化学等实验方法对所制备样品进行表征.实验结果表明,合成体系的pH和所用阴离子聚电解质聚合物链的空间位阻对金纳米粒子的稳定性起着非常重要的作用.展开更多
The effects of three electrolyte anions,ionic strength and pH on the adsorption of sulfate by two variable charge soils,with different surface charge properties were studied.Under the conditions of the same pH and ion...The effects of three electrolyte anions,ionic strength and pH on the adsorption of sulfate by two variable charge soils,with different surface charge properties were studied.Under the conditions of the same pH and ionic strength the effect of electrolyte anions on the adsorption of sulfate was in the order of Cl^->NO3^->ClO4^-,indicating the difference of the nature among these three anions.For ferralsol in the same concentration of chloride and perchloride solutions,the two sulfate adsorption-pH curves could intersect at certain pH value.When pH was higher than the intersecting point.more sulfate was adsorbed in the perchloride solution,while when it was lower than the intersecting point,more sulfate was adsorbed in the chloride solution.In different concentratioins of electrolyte solution,the curves of the amount of oxy-acid anion adsorbed,which changed with pH,could intersect at a certain pH,which is termed point of zero salt effect(PZSE) on adsortpion.The nature of electrolyte anions influenced obviously the appearace of PZSE for sulfate adsorption.For ferralsol the curves of adsorption converged to about pH 7 in NaCl solution seemed to intersect in NaNO3 solution and to have a typical PZSE for sulfate adsorption in NaClO4 solution,For Acrisol the three curves of adsorption were nearly parallel in NaCl and NaNO3 solutions and converged to pH 6.5 in NaClO4 solution.展开更多
The adsorption characteristics of cationic polyelectrolyte poly dimethyl diallyl ammonium chloride(PDADMAC) and anionic polyelectrolyte poly(sodium-p-styrenesulfonate)(PSS) on benzoguanamine formaldehyde(BGF) particle...The adsorption characteristics of cationic polyelectrolyte poly dimethyl diallyl ammonium chloride(PDADMAC) and anionic polyelectrolyte poly(sodium-p-styrenesulfonate)(PSS) on benzoguanamine formaldehyde(BGF) particles are investigated. The charging characteristics of BGF particles are changed and controlled using electrostatic self-assembly method. A variety of PEi-BGF/SiO2composite abrasives are obtained.The as-prepared samples are analyzed by zeta potential analysis,transmission electron microscope(TEM) and thermogravimetric(TG) analysis. The composite abrasive slurries are prepared for copper polishing. The polishing results indicate that it is SiO2abrasives,not only coated SiO2abrasive on polymer particles but also free SiO2abrasive in slurry,that offer the polishing action. The material removal rates of copper polishing are264 nm/min,348 nm/min and 476 nm/min using single SiO2abrasive slurry,PE0-BGF/SiO2mixed abrasive slurry and PE3-BGF/SiO2composite abrasive slurry,respectively. The surface roughness Raof copper wafer(with 5 μm×5 μm district) is decreased from 0.166 μm to 3.7 nm,2.6 nm and 1.5 nm,and the surface peak-valley values Rpvare less than 20 nm,14 nm and 10 nm using these kinds of slurries,respectively.展开更多
文摘The fabrication and structure characterization of a self-assemble film were reported.An orderded layer structure ultrathin film was formed by alternative deposition of poly(sodium 4-styrenesulfonate)as polyanion and benzidine dihydrochloride as cationic compounds.UV-visible absorption spectrum,contact angle measurement and ellipsometry measurement were conducted to characterize the film.
文摘采用NaBH4作为还原剂还原HAuCl4的方法,将阴离子聚电解质即聚丙烯酸(PAA)作为保护剂,成功制备了稳定性非常好的小粒径金纳米粒子.分别采用紫外 可见 近红外光谱仪(UV vis NIR)、透射电子显微镜(TEM)、光电子能谱仪(XPS)、X射线衍射仪(XRD)和电化学等实验方法对所制备样品进行表征.实验结果表明,合成体系的pH和所用阴离子聚电解质聚合物链的空间位阻对金纳米粒子的稳定性起着非常重要的作用.
文摘The effects of three electrolyte anions,ionic strength and pH on the adsorption of sulfate by two variable charge soils,with different surface charge properties were studied.Under the conditions of the same pH and ionic strength the effect of electrolyte anions on the adsorption of sulfate was in the order of Cl^->NO3^->ClO4^-,indicating the difference of the nature among these three anions.For ferralsol in the same concentration of chloride and perchloride solutions,the two sulfate adsorption-pH curves could intersect at certain pH value.When pH was higher than the intersecting point.more sulfate was adsorbed in the perchloride solution,while when it was lower than the intersecting point,more sulfate was adsorbed in the chloride solution.In different concentratioins of electrolyte solution,the curves of the amount of oxy-acid anion adsorbed,which changed with pH,could intersect at a certain pH,which is termed point of zero salt effect(PZSE) on adsortpion.The nature of electrolyte anions influenced obviously the appearace of PZSE for sulfate adsorption.For ferralsol the curves of adsorption converged to about pH 7 in NaCl solution seemed to intersect in NaNO3 solution and to have a typical PZSE for sulfate adsorption in NaClO4 solution,For Acrisol the three curves of adsorption were nearly parallel in NaCl and NaNO3 solutions and converged to pH 6.5 in NaClO4 solution.
基金Natural Science Foundation of Zhejiang Province(No.Z1080625)
文摘The adsorption characteristics of cationic polyelectrolyte poly dimethyl diallyl ammonium chloride(PDADMAC) and anionic polyelectrolyte poly(sodium-p-styrenesulfonate)(PSS) on benzoguanamine formaldehyde(BGF) particles are investigated. The charging characteristics of BGF particles are changed and controlled using electrostatic self-assembly method. A variety of PEi-BGF/SiO2composite abrasives are obtained.The as-prepared samples are analyzed by zeta potential analysis,transmission electron microscope(TEM) and thermogravimetric(TG) analysis. The composite abrasive slurries are prepared for copper polishing. The polishing results indicate that it is SiO2abrasives,not only coated SiO2abrasive on polymer particles but also free SiO2abrasive in slurry,that offer the polishing action. The material removal rates of copper polishing are264 nm/min,348 nm/min and 476 nm/min using single SiO2abrasive slurry,PE0-BGF/SiO2mixed abrasive slurry and PE3-BGF/SiO2composite abrasive slurry,respectively. The surface roughness Raof copper wafer(with 5 μm×5 μm district) is decreased from 0.166 μm to 3.7 nm,2.6 nm and 1.5 nm,and the surface peak-valley values Rpvare less than 20 nm,14 nm and 10 nm using these kinds of slurries,respectively.
