以苯乙烯(St)、丙烯酸甲酯(MA)和丙烯酰胺(AM)为反应单体,偶氮二异丁腈为引发剂,采用反相微乳液聚合法,合成了成膜型纳米微乳液封堵剂。合成反应的最佳条件为:乳化剂复配比span80∶tween80=2∶1(质量比),反应单体配比为St∶MA∶AM=3∶1...以苯乙烯(St)、丙烯酸甲酯(MA)和丙烯酰胺(AM)为反应单体,偶氮二异丁腈为引发剂,采用反相微乳液聚合法,合成了成膜型纳米微乳液封堵剂。合成反应的最佳条件为:乳化剂复配比span80∶tween80=2∶1(质量比),反应单体配比为St∶MA∶AM=3∶1∶2(质量比),单体总浓度为25%,引发剂用量为2%,反应温度60℃,反应时间4 h。封堵剂的粒径中值为125.5 nm,满足对页岩微裂缝封堵的尺寸条件;热重分析表明,纳米封堵剂分解温度290℃左右,热稳定性好;在钻井液体系中加入3%的封堵剂,90℃热滚16 h后,粘度和切力变化不大,流变性较稳定,且其API滤失量仅为2 m L,FLHTHP(30 min)为6.0 m L,该纳米封堵剂性能优异,封堵效果好。展开更多
ZnS ∶Cu nanoparticles were prepared by using microemulsion method at room temperature. The size of the particles is 2-8 nm by transmission electron microscopy (TEM) and dynamic light scattering (DLS) technique. X-ray...ZnS ∶Cu nanoparticles were prepared by using microemulsion method at room temperature. The size of the particles is 2-8 nm by transmission electron microscopy (TEM) and dynamic light scattering (DLS) technique. X-ray diffraction analysis shows that the particles are cubic crystal structure, the same structure as the bulk ZnS materials. Ultraviolet absorption demonstrates an increased bandgap due to quantum confinement effect. Photoluminescence spectrum shows there is a single green emission band at 482 nm.展开更多
Ni nanoparticles plating was prepared in reverse microemulsion. The deposition was carried out through the Brownian motion of water pools in the reverse microemulsion and the adsorption of water pools on the electrode...Ni nanoparticles plating was prepared in reverse microemulsion. The deposition was carried out through the Brownian motion of water pools in the reverse microemulsion and the adsorption of water pools on the electrode surface. Effects of electrolytic parameters on the size of Ni particles were studied. The performances of hydrogen evolution and hydrogen storage of the Ni nanoparticles plating electrode were also investigated. The results indicate that the size of Ni nanoparticles decreases with the increase of Ni2+ concentration and the decrease of current density. The electrochemical activity of Ni nanoparticles plating electrode is much higher than that of bulk Ni electrode.展开更多
Y2O3 nanoparticles prepared in microemulsion, which were sprayed on cut tobacco, can reduce tar in cigarettes effectively. Reducing the content of tar in many brands of cigarettes was studied. The results show that Y2...Y2O3 nanoparticles prepared in microemulsion, which were sprayed on cut tobacco, can reduce tar in cigarettes effectively. Reducing the content of tar in many brands of cigarettes was studied. The results show that Y2O3 nanoparticles can reduce tar in cigarettes effectively and have no influence on nicotine when the addition of Y2O3 nanoparticles is 0,5-1.2%. The smaller the grain size of Y2O3 nanoparticles is,the more effective tar reduction is. The principle of reducing tar in cigarettes is studied preliminarily.展开更多
Fe3O4/P （NaUA-St-BA） core-shell composite micro spheres were in situ prepared by soapless polymerization of styrene and butyl acrylate, with Fe3O4magnetic colloidal particles coated with NaUA. The results of IR and ...Fe3O4/P （NaUA-St-BA） core-shell composite micro spheres were in situ prepared by soapless polymerization of styrene and butyl acrylate, with Fe3O4magnetic colloidal particles coated with NaUA. The results of IR and XRD analysis demonstrated that the desired polymer chains have been covalently bonded to the surface of Fe3O4 nano particles. The morphology analysis by TEM confirmed that the composite particles have the core-shell structure and a relatively uniform diameter of about 100nm. The magnetic properties of the obtained composite latex particles were measured by VSM and found that they exhibited super paramagnetic properties. Finally, the prepared magnetic composite particles latex is stable for several months.展开更多
文摘以苯乙烯(St)、丙烯酸甲酯(MA)和丙烯酰胺(AM)为反应单体,偶氮二异丁腈为引发剂,采用反相微乳液聚合法,合成了成膜型纳米微乳液封堵剂。合成反应的最佳条件为:乳化剂复配比span80∶tween80=2∶1(质量比),反应单体配比为St∶MA∶AM=3∶1∶2(质量比),单体总浓度为25%,引发剂用量为2%,反应温度60℃,反应时间4 h。封堵剂的粒径中值为125.5 nm,满足对页岩微裂缝封堵的尺寸条件;热重分析表明,纳米封堵剂分解温度290℃左右,热稳定性好;在钻井液体系中加入3%的封堵剂,90℃热滚16 h后,粘度和切力变化不大,流变性较稳定,且其API滤失量仅为2 m L,FLHTHP(30 min)为6.0 m L,该纳米封堵剂性能优异,封堵效果好。
文摘ZnS ∶Cu nanoparticles were prepared by using microemulsion method at room temperature. The size of the particles is 2-8 nm by transmission electron microscopy (TEM) and dynamic light scattering (DLS) technique. X-ray diffraction analysis shows that the particles are cubic crystal structure, the same structure as the bulk ZnS materials. Ultraviolet absorption demonstrates an increased bandgap due to quantum confinement effect. Photoluminescence spectrum shows there is a single green emission band at 482 nm.
基金Projects(20673036,J0830415) supported by the National Natural Science Foundation of ChinaProject(09JJ3025) supported by Hunan Provincial Natural Science Foundation of ChinaProject(09GK3173) supported by the Planned Science and Technology Project of Hunan Province,China
文摘Ni nanoparticles plating was prepared in reverse microemulsion. The deposition was carried out through the Brownian motion of water pools in the reverse microemulsion and the adsorption of water pools on the electrode surface. Effects of electrolytic parameters on the size of Ni particles were studied. The performances of hydrogen evolution and hydrogen storage of the Ni nanoparticles plating electrode were also investigated. The results indicate that the size of Ni nanoparticles decreases with the increase of Ni2+ concentration and the decrease of current density. The electrochemical activity of Ni nanoparticles plating electrode is much higher than that of bulk Ni electrode.
文摘Y2O3 nanoparticles prepared in microemulsion, which were sprayed on cut tobacco, can reduce tar in cigarettes effectively. Reducing the content of tar in many brands of cigarettes was studied. The results show that Y2O3 nanoparticles can reduce tar in cigarettes effectively and have no influence on nicotine when the addition of Y2O3 nanoparticles is 0,5-1.2%. The smaller the grain size of Y2O3 nanoparticles is,the more effective tar reduction is. The principle of reducing tar in cigarettes is studied preliminarily.
文摘Fe3O4/P （NaUA-St-BA） core-shell composite micro spheres were in situ prepared by soapless polymerization of styrene and butyl acrylate, with Fe3O4magnetic colloidal particles coated with NaUA. The results of IR and XRD analysis demonstrated that the desired polymer chains have been covalently bonded to the surface of Fe3O4 nano particles. The morphology analysis by TEM confirmed that the composite particles have the core-shell structure and a relatively uniform diameter of about 100nm. The magnetic properties of the obtained composite latex particles were measured by VSM and found that they exhibited super paramagnetic properties. Finally, the prepared magnetic composite particles latex is stable for several months.
