镀镍云母导电复合材料的研究

对云母粒子化学镀镍及以LDPE为基材,镀镍云母粒子为填料制备的导电复合材料进行研究。认为此种导电复合材料只有质量轻、强度大及良好的导电等性能。     

某复杂多金属矿低尾化综合利用技术研究

矿产资源在选矿过程中产生的大量尾矿,既是资源的浪费,又是环境污染源。因此,开展低尾化乃至无尾化综合利用研究,最大程度提高资源利用率是未来矿产资源开发、利用的必由之路。本文在研究国内某复杂多金属矿综合利用时,通过分析所含矿物的基因属性、赋存状态以及嵌布关系,先后进行了钽铌精矿、方解石精矿、锂精矿、云母精矿、长石精矿、石英精矿共计6个产品的选别回收,实现了除少量泥质、铁屑之外的全产品、无尾化综合利用技术路线,可为以后同类型复杂多金属矿的综合回收提供思路借鉴。     

Structural analysis and characterization of doped spinel Co2−xMxTiO4 (M=Mg2+, Mn2+, Ni2+, Cu2+ and Zn2+) coated mica composite pigments

A new kind of composite mica pigments were prepared by coating Co_2−xM_xTiO₄ composite oxide nanoparticles onto mica, to investigate the effects of doping ions Mg²⁺, Mn²⁺, Ni²⁺, Cu²⁺ and Zn²⁺ on the properties of the doped composite pearlescent pigments, such as the crystal structure, color and shading power. The structure, morphology, color and shading power of the coated pigments were characterized by the X-ray diffraction (XRD), scanning electron microscopy (SEM), UV–vis spectrophotometer and CIE L*a*b* methods. SEM images of coated pigments showed that mica were coated uniformly with a single layer of dispersed nanoparticles. Research of the doped composite pigments showed that the doping ions had entered into the spinel crystal structure, forming a new kind of composite mica pearlescent pigments coated with Co_2−xM_xTiO₄. For the analysis of color and shading power of the pigments, doping of Ni²⁺ and Zn²⁺ can improve the color and shading power of the doped pigments, but the larger dosage of Zn²⁺ doping can weaken the color and shading power of the doped pigments. Doping of Mg²⁺, Mn²⁺ and Cu²⁺ metal ions can also weaken the color and shading power of the doped pigments.     

云母波片属性的分光光度计标定法

利用分光光度计测定了云母波片偏光透射干涉谱，通过对该光谱理论和实验上的分析，提出了云母波片属性的分光光度计标定法。利用该方法可以准确标定波片的1／2或1／4属性以及波片的快慢轴方向。     

Adsorption of uranyl ions and microscale distribution on Fe-bearing mica

The interaction of uranyl ions (UO₂²⁺) with Fe-bearing mica is an important determinant of the mobility of U species in granitic rocks or their weathered terrains, especially with regard to radionuclide migration. To understand their interaction, U sorption experiments were conducted on both fresh and oxidized biotites, especially examining an effect of oxidized mineral surfaces which was treated by H₂O₂ for 3 weeks. The U sorption onto the biotite reached a maximum at around pH 7.0, and the amount adsorbed by the oxidized biotite was much larger than that by the fresh one. The difference of the adsorption capacity between the two biotites may be attributed to an increase in the specific surface area by oxidization, which accompanies some slightly peeled off and reactive surfaces with amorphous precipitates. During the U adsorption reaction, there was a continuous depletion of K⁺ ions from the interlayer space. At the same time structural Fe was released and oxidized near the edges, forming non-detectable very small goethite particles. Such an incipient feeble crystalline Fe (hydr)oxide phase was only detected by scanning electron microscopy (SEM), but its location interestingly corresponded to the U adsorbed position on the biotite surface, implying its strong adsorption of U. Besides, the crystallized Fe (hydr)oxide seems to be relatively more effective in the adsorption of U as compared with the amorphous one on the H₂O₂ treated biotite.     

Negative staining-carbon film technique: New cellular and molecular applications

Two techniques are presented which extend the original negative staining-carbon film technique into new areas of cellular and molecular application. These relate (1) to the production of negatively stained specimens of single-layer plasma membrane split from intact cells during the overall procedure that are negatively stained from the cytoplasmic face and (2) to the production of negatively stained specimens directly from glycerol-containing protein solutions, membrane or viral suspensions. In both cases in vacuo drying onto mica from glycerol is performed, prior to deposition of a carbon film. (For the cellular technique, freshly cleaved mica is firstly rendered positively charged by immersion in Alcian blue.) This is followed by release of the carbon film plus adsorbed membrane or protein by floating onto water, with subsequent negative staining. Selected preliminary applications using human erythrocyte membrane and the high molecular weight (native) human erythrocyte tripeptidyl peptidase-II complex are given and considered speculation as to the future application of the techniques is provided.     

Elastomer monolayers adsorbed on mica surfaces by nitroxide-mediated polymerisation

We reported the first synthesis of Poly(n-butyl acrylate) by in situ nitroxide-mediated polymerisation from the surface of mica while preserving its lamellar structure. To obtain this polymer adsorbed to mica surface, a free radical initiator 2,2′-azobis(isobutyramidine hydrochloride) (AIBA) was attached by ion exchange to the surface of mica, and the resulting was used as a initiator to polymerise butyl acrylate. The kinetic studies show that the initiator adsorbed to mica surface successfully initiated the radical polymerisation of butyl acrylate. Adsorbed polymer was indeed obtained, in different amounts depending on reaction time, the XRD patterns of resulting products indicate that the polymer chains did not intercalate the aluminosilicate layers, as expected.     

Mechanical behavior of micaceous clays

This study aims to investigate the effect of mica content on the mechanical properties of clays.Commercially available ground mica was blended with a locally available clayey soil,at varying nica contents by mass of 5%,10%,15%,20%,25% and 30%,to artificially prepare various micaceous clay blends.The preliminary testing phase included consistency limits and standard Proctor compaction tests.The primary testing program consisted of unconfined compression(UC),direct shear(DS) and scanning electron microscopy(SEM) tests.The test results showed that the liquid and plastic limits exhibited a linear,monotonically increasing trend with increase in mica content.The rate of increase in the plastic limit,however,was found to be greater than that of the liquid limit,thereby leading to a gradual transition towards a non-plastic,cohesionless character.The soft,spongy fabric and high water demand of the mica mineral led to higher optimum water contents and lower maximum dry unit weights with increasing mica content.Under low confinement conditions,i.e.the UC test and the DS test at low normal stresses,the shear strength was adversely affected by mica.However,the closer packing of the clay and mica components in the matrix under high confinement conditions offsets the adverse effects of mica by inducing frictional resistance at the shearing interface,thus leading to improved strength resistance.     

层状BiOCl—云母珠光颜料的研制

介绍了氯氧化铋（BiOCl)、BiOCL-云母及Ti或Zr改性的BiOCl－云母珠光颜料。经测试表明，Ti或Zr改性的BiOCl－云母珠光颜料的光泽及耐候性大大提高，并分析了该改性方法提高BiOCl珠光颜料的光泽及耐候性的机理。     

10kV小容量电机匝间绝缘结构及绕组绕制方法探讨

叙述了１０ｋＶ高压电机的绝缘结构和特点,重点讨论了故障较高的匝高绝缘和较小容量１０ｋＶ电机的绝缘结构。