新型EMR液的ER和MR性能研究

制备了金属酞菁 (MPc) - Fe3O4纳米复合粒子 (M=Co,Cu,Ni,Mn)与氯化石腊油组成了 EMR液 ,研究了其ER、MR性能。结果表明 ,此类 EMR液在较低的电场和磁场作用下就表现出较强的 ER、MR活性。在外加电场作用下 ,EMR液的剪切应力变化值 Δτ与外加电场强度基本上呈线性关系 :Δτ=α·E。在外加磁场作用下 ,EMR液的 Δτ～γ关系符合 Bingham关系式 :Δτ=Δτy H ηHγ。 ηH 随着 H的增加而增大。     

Synthesis and catalytic activity of different substituted metal phthalocyanine-MWCNTs hybrid materials for selective oxidation of styrene

An efficient process for the preparation of novel [4α(OPh-t-Bu)MPc]-MWCNTs and tetranitro substituted metal phthalocyanine (MTNPc)-MWCNTs hybrid catalysts was developed via an ultrasonic impregnation method. The obtained hybrid materials were characterized comprehensively with X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Fourier transform infrared spectra (FT-IR). The oxidation of styrene was examined using tert-Butyl hydroperoxide (TBHP) as oxidant, and using MTNPc-MWCNTs and [4α(OPh-t-Bu)MPc]-MWCNTs complexes (M: Zn and Co) as catalysts. The results indicated that cobalt phthalocyanines were more efficient catalysts in the styrene oxidation reaction as compared to zinc phthalocyanine. It was found that during reaction with tert-butyl hydroperoxide (TBHP) as the oxidant, the conversion and selectivity of all synthesized compounds in dimethylformamide (DMF) was higher than in acetonitrile (CH₃CN). Moreover, the catalytic mechanism of styrene oxidation has been proposed for the different substituted metal phthalocyanine-MWCNTs hybrid materials.