金属氧化物混相颜料研究进展

本文详细介绍了金属氧化物混相颜料的性能特点、制备方法和应用领域,并就国内外金属氧化物混相颜料研究的最新进展提出了自己的设想     

金属氧化物混相颜料的性能和应用

简述了金属氧化物混相颜料的种类和性能，着重介绍了符合环境保护要求、产品附加值高、市场潜力大的这类无机彩色颜料在替代铬黄和钼红方面，以及在卷材涂料、超耐大型外用建筑涂料、耐高温涂料、公路标志涂料和伪装涂料中的应用。     

钴蓝颜料的研究与开发

笔者对尖晶石型钴蓝颜料的结构和显色机理做了介绍,并对钴蓝颜料的制备方法加以综述。其制备方法主要有固相反应法、液相反应法,其中固相反应法是目前工业生产的常用方法。实验中根据钴蓝颜料的结构与显色机理在配方中引入氧化锌,研究氧化锌对于钴蓝颜料呈色以及烧成温度的影响。最终确定合理配方,节约了氧化钴资源,同时烧成温度也降低了,减少了天然气能量消耗,达到了低碳的目的。     

新一代高性能效应颜料--随角异色颜料

随角异色颜料是以多种材料作为基片，并在此基片表面包覆多种金属氧化物，从而随观察角度的变化而得到不同颜色的颜料。介绍了随角异色颜料的分类和基本原理，及其研究现状和存在的问题。     

光催化型金属氧化物抗菌剂的研究进展

随着人们对健康的重视程度越来越高,尤其是近几年受到新冠疫情的冲击,抗菌材料的研究和应用逐渐成为研究的热点。在材料中添加抗菌剂是最常见、最简便有效的加工方法。抗菌剂的活性对抗菌材料的效果和使用产生很大的影响。光催化型金属氧化物抗菌剂具有抗菌效果高、持效性强等优势。本文阐述了光催化型金属氧化物抗菌剂的抗菌机理、种类及应用,重点介绍了无机抗菌剂中的金属氧化物及掺杂型金属氧化物光催化抗菌剂的研究现状及目前存在的问题,展望了未来光催化型金属氧化物抗菌剂的应用前景和研究方向。     

片状导电珠光颜料的现状与发展

综述了近年来国内外的一种新型导电颜料————片状导电珠光颜料的现状及发展情况。介绍了片状导电珠光颜料的特点、分类、导电机理与制备方法,以及今后的研究和开发方向。     

金属氧化物导电粉体的研究进展

金属氧化物导电粉的制备方法及国内外研究进展,着重对氧化锡类及氧化锌类导电粉的掺杂导电机理进行了分析,并对该领域的发展前景及今后的研究趋势进行了评述。     

金属离子印迹聚合物微球的制备研究进展

对金属离子印迹的原理、发展现状等进行了概述,尤其对印迹聚合物微球制备方法中的种子乳液溶胀聚合、乳液聚合和悬浮聚合、W/O/W多相乳液聚合等方法进行了较详细的介绍。     

用SHS法合成陶瓷色料应注意的几个问题

简述了 Ｓ Ｈ Ｓ 法的 基本原理及其在 陶瓷色料合成 中应注意的问题     

稀土黄色颜料研究进展

稀土黄色颜料是新型的环境友好型无机颜料,具有广阔的应用前景。这里对稀土黄色颜料的制备方法,以及其组成、掺杂离子、矿化剂和灼烧温度对黄色颜料晶体结构和呈色机理影响进行了综述性介绍。     

ACTIVITY AND SELECTIVITY VARIATIONS IN THE OXIDATIVE DEHYDROGENATION OF ETHANE OVER A MOLYBDENUM - VANADIUM - NIOBIUM MIXED OXIDE CATALYST

A single pellet reactor was used to investigate the activity and selectivity variations with time in the oxidative dehydrogenation of ethane with a mixed oxide catalyst having a composition of Mo_0.71V_0.2Nb_0.09. Experiments conducted at 450°C in the absence of oxygen showed rapid deactivation. In these experiments very high selectivities, reaching to unity, were observed at fractional conversions of 0.1 or less. An increase in conversion and a decrease in selectivity was observed with a decrease in catalyst porosity and also with an increase in pellet length, indicating the significance of diffusion time. This effect is found to be especially significant at the initial stages of reaction (fresh catalyst). In the absence of oxygen a large amount of CO was produced during the first couple of minutes of the reaction. On the other hand, in the presence of oxygen, the major side product is CO₂. It was also concluded that gas phase oxidation of ethane to CO₂ is not significant.     

陶瓷工业中的红色颜料及其研究进展

对陶瓷工业中使用的红色陶瓷颜料做了全面综述,讨论了红色陶瓷颜料的种类特别是近年来开发的一些新品种及其研究进展.同时,对陶瓷颜料的制备工艺进展也做了简要叙述.     

REDUCTION OF SULPHUR DIOXIDE BY METHANE OVER TRANSITION METAL OXIDE CATALYSTS

The reduction of sulfur dioxide by methane for the production of elemental sulfur using two hydrodesulfuriz-ation catalysts was studied. Oxides of cobalt-molybdenum and molybdenum alone supported on γ-alumina were employed. The reactions were carried out in a quartz reactor at 650^°C and 750^°C and at molar feed ratios (SO₂/CH₄ varying between 0.50 to 2.50. The physicochemical stale of the catalysts was examined by SEM, BET and X-ray diffraction. Molybdenum oxide was converted to sulphide after the chemical reaction. The cobalt molybdenum catalyst was found to be the more active of the two; however, the molybdenum catalyst exhibited higher elemental sulphur yield (99%). Side reactions resulted in the formation of H₂S, COS, CO, and elemental carbon. The production of these is minimized by operating at molar feed ratios greater than 1 and low temperature. The production of H2S is favoured over COS below 700^°C.     

IRON OXIDE IN ENAMEL GLASS AS DISSOLVED FROM THE METAL BASE*

The iron oxide content of an enamel glass was measured by the use of a predetermined curve representing iron oxide versus the index of refraction. It was found that the iron oxide content of the glass adjoining the interface between the enamel and the iron base rises sharply in the early stages of firing to a value close to the solubility limit of the glass after which it gradually falls to a constant value. The iron content at the surface remains low until that at the interface decreases, whereupon the surface concentration correspondingly increases. The cobalt additions resulted in a lower iron content in solution at the interface, but they increased the dendrite content of the glass. A decrease in the cobalt content resulted in an opposite effect. There was a direct relation between the amounts of cobalt and dendrites and the adherence. The effects of temperature and thickness of application are given, and the results are discussed.     

Morphological transformations in cobalt doped zinc oxide nanostructures: Effect of doping concentration

Effect of doping concentration on the morphological, vibrational and optical properties of ZnO nanostructures has been studied systematically. Incorporation of cobalt into the ZnO lattice is found to gradually transform the morphology from hexagonal cylinders to rods for nominal Co concentration of 1–10 at%, respectively. An increase in hydroxyl ion concentration in the Co precursor leads to a preferential growth along [001] direction, giving rise to the formation of rod-like structures for high Co concentrations. Based on the structural characterization, a model for morphological evolution of microstructures has been proposed. Debye–Scherrer analysis of XRD pattern reveals an increase of the crystallite size with doping concentration. The band gap, calculated using a Kubelka–Munk method, reveals a decrease in the absorption onset with an increase in the doping level. Raman analysis reveals the basic as well as impurity phases and FT-IR analysis confirms the incorporation of cobalt-doping. Photoluminescence analysis provided further insight of the optical processes altered with the Co doping.     

A NEW HIGH TEMPERATURE AEROSOL DECOMPOSITION PROCESS FOR THE SYNTHESIS OF MIXED METAL OXIDES FOR CERAMICS AND CATALYSTS AND THEIR CHARACTERIZATION

A reactor system was developed which permitted the facile preparation of single and mixed metal oxides having high surface areas and unusual morphologies and physical properties. The synthetic technique produced compositions having a hollow sphere geometry, minimal pore structure, high purity, and low bulk density. Unusually high concentrations of solid solutions of modifying metal ions in host metal oxides were observed.