聚电解质纳米颗粒毛细管气相色谱柱的制备

利用带相反电荷聚电解质间的静电相互作用,制备聚电解质纳米复合颗粒,以此纳米颗粒为固定相构筑新型毛细管色谱柱,考察色谱柱的应用性能.结果表明:该毛细管柱固定相的平均麦氏常数为1159;以正十二烷为标准物质,测得的理论塔板数达2 799p·m~(-1);最高使用柱温为280℃;用该柱对非极性和极性标准样品进行分离,显示出良好的分离效果,表明该色谱柱具有一定的应用前景.     

[M(2,2'–bpy)2]2SiW12O40（M=Mn,Co;bpy=联吡啶）的合成、结构及其电催化水产氧性能

用水热法合成了过渡金属联吡啶配阳离子硅钨杂多酸:[M(2,2’-bpy)2]2SiW12O40(M=Mn(1)和M=Co(2)),采用红外光谱、元素分析、热重和单晶X射线衍射对其进行了表征。结果表明,化合物1和2是异质同构体,具有二维格子框架结构。初步研究了2种化合物的电催化H2O析出O2性能,发现化合物1对电催化H2O析出O2有一定的催化作用。     

信息不对称下具有过度自信零售商的供应链激励契约研究

在有过度自信零售商的分销供应链中,利用委托代理模型分别得出了信息对称及信息不对称时(努力程度无法监控)的最优特许经营费契约。探究了在两种情况下,零售商过度自信程度对其努力程度及制造商利润的影响。从比较中得知信息不对称下零售商的努力程度及制造商利润都小于信息对称下的情况,两种差别分别与零售商的过度自信程度成反比。零售商的过度自信行为有正面的信息价值,能减少信息不对称的影响;制造商偏爱过度自信程度较高的零售商。     

Lithium Storage Property of Graphite/AlCuFe Quasicrystal Composites

Quasicrystals have long-range quasi-periodic translational ordering and non-crystallographic rotational symmetry.Al-Cu-Fe quasicrystals have great potential for lithium storage because of their high Al content and a large number of defects in the structure.In our previous study(J.Alloys Compd.805(2019)942)we showed that Al-Cu-Fe quasicrystals have good initial capacity whereas its cycle stability is poor.In the present study,graphite/AlCuFe is prepared by the mechanical alloying method.The results show that graphite/AlCuFe quasicrystal composites are successfully synthesized by planetary ball milling at 550 rpm for 80 h.The quasicrystal particle size decreases and the amorphous graphite forms onion-like carbon(OLC)when the two phases mix evenly.OLC forms on the surface of the Al-Cu-Fe quasicrystalline powder.Charge and discharge tests show that graphite/AlCuFe quasicrystal composites have high-stability capacity of 480 mAh/g after 20 cycles,which is larger than the sum of capacities of graphite and Al-Cu-Fe quasicrystals.