共查询到20条相似文献,搜索用时 171 毫秒
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综述了含单种杂原子的桥联杯芳烃的合成研究进展。目前合成的大多数的杯芳烃都是碳桥联的,除了碳,如硼、硅、锗、锡、氮、磷、氧、硫、硒原子都可以作为桥联原子建构杯芳烃,其中硅、氮、氧、硫桥杯芳烃报道文献较多,介绍了含单种杂原子的桥联杯芳烃的合成条件及其应用。 相似文献
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杯芳烃是由多个苯酚类化合物通过亚甲基在酚羟基邻位连接而形成的环状低聚物。由于杯芳烃及其衍生物对客体分子表现出特殊的识别能力,因而产生了各种高价值的应用。本文介绍了杯芳烃及其衍生物的合成和应用的情况。 相似文献
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硫杂杯芳烃是一类以硫原子取代桥联亚甲基的新型杯芳烃,作为新一代超分子砌块,在分子识别、超分子自组装、晶体工程和纳米材料等方面都获得了广泛的应用,己成为当今超分子化学研究的新热点. 相似文献
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简要介绍了杯芳烃的结构、性能及应用,重点综述了:(1)新型杂原子杯芳烃的合成及超分子自组装;(2)杯芳烃衍生物的合成及对金属离子的识别;(3)杯[4]吡咯席夫碱衍生物的合成。 相似文献
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陶瓷花鸟画在陶瓷装饰史上有着十分重要的地位。受中国传统文化的影响,陶瓷花鸟画是在我国传统花鸟画的基础上发展起来的。但随着东西方文化的交融,以及艺术交流的不断拓展,陶瓷花鸟画在创新和风格等方面愈加丰富,艺术家逐渐把一种人格力量、文化内涵注入到花鸟画之中,托物言志,寓意社会现象、高尚品德,表达思想感情。 相似文献
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《Ceramics International》2023,49(20):32343-32358
The many branches of nanoscience have made significant strides and advancements during the past ten years, as has the entire scientific community. Zirconia nanoparticles have several uses as adsorbents, nanosensors, nanocatalysts, and other types of nanomaterials. Their outstanding biomedical uses in dental care and drug delivery, as well as their intriguing biological characteristics, such as their anti-cancer, anti-microbial, and antioxidant activity, have further encouraged researchers to investigate their physicochemical properties using various synthetic pathways. Due to the popularity of zirconia-based nanomaterials, the current research comprehensively examines several synthesis techniques and their effects on the composition, dimensions, forms, and morphologies of these nanomaterials. In general, there are two methods for creating zirconia nanoparticles: chemical synthesis, which uses hydrothermal, solvothermal, sol-gel, microwave, solution combustion, and co-precipitation processes; and a greener method, which uses bacteria, fungi, and plant components. The aforementioned techniques have been evaluated in the present review for achieving particular phases and shapes. A thorough analysis of zirconia-based nanomaterial's uses is also included in the review. Furthermore, comparisons with their equivalent composites for various applications as well as the influence of particular phases and morphologies have been added. The final portion includes the summary, future outlook, and potential application. 相似文献
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Solid-state organic batteries based on charge-transfer complexes have been extensively used. However, the low mechanical strengths of these materials have restricted their applications. The polymer composite of these materials have been prepared and used in fabrication of solid-state batteries to overcome this problem. The pressed pellets of the polymer composite of o-tolidine–iodine (1:0.75) charge-transfer complex in poly(vinyl chloride) and polystyrene have been used as cathodes in contact with zinc as anode metal. The electrochemical characterization of these cells such as open-circuit voltages, short-circuit currents, their time and temperature dependence and rechargeability of these cells have been studied. The impedance analyses have been done to understand the nature of the electrode reaction. 相似文献
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《Education for Chemical Engineers》2014,9(1):e15-e19
Problem based learning can impact not only on students’ academic performance but also their social interactions within their peer group, and many institutions have embedded such teaching within their core curriculum. This paper looks at the interactions within a first year undergraduate engineering cohort that uses peers to tutor small groups through problem based learning at a Scottish Higher Education Institution. Most significantly, this work focusses on the impact that these interactions have on the students engaged as tutors within the programme, bridging the gap left by previous studies and providing an insight into how tutors are affected by their experiences. It was found that the recruitment of tutors requires careful consideration of their social as well as academic qualities, and that they should receive training and guidance within their adopted roles that takes account of social factors, questioning the traditional practice of employing individuals purely on the basis that they have studied the class previously themselves. The dynamic of tutor position with regard to the presence of senior staff is also explored, and suggests mechanisms for further student development. 相似文献
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Asima Naz Ayesha Kausar Muhammad Aziz Choudhary 《Polymer-Plastics Technology and Engineering》2016,55(2):171-198
Owing to their remarkable electrical, mechanical, thermal, catalytic, and optical properties as well as their unique structure, carbon nanotubes and graphite have been exploited to produce high performance and multifunctional composites. The resultant composites are differentiated on the basis of their properties to meet various applications. In the framework of this review article, we have mainly focused on the preparation, structure, and properties of two families of composite materials with an emphasis on the differences between them. Moreover, the current challenges, future prospectives, and applications of carbon nanotubes- and graphite-based materials in sensors and in photovoltaic and energy storage devices (Li-ion battery) have been discussed. 相似文献
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介绍了硬质交联发泡聚氯乙烯板材的结构性能、国内外发展现状及其发展前景;硬质交联发泡聚氯乙烯板材具有阻燃性能,有望取代现有的三大泡沫塑料,成为新型节能保温材料;国外生产的硬质交联发泡聚氯乙烯板材产品性能优异,而国内其工业化生产属于空白。与现有建筑用发泡塑料对比,硬质交联发泡聚氯乙烯性能更加优越,其应用前景更加广阔。 相似文献
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壶是中国陶瓷文化的一个重要组成部分,不同时代的陶瓷壶具都有不同的风貌,不同时代的审美品味也影响着壶的造型。而随着时代的变迁壶的功能也不断演变,一部壶的发展史也就是一部中国陶瓷发展史的缩影。 相似文献
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A Review of Contemporary Views of Theories of Adhesion 总被引:2,自引:0,他引:2
K. W. Allen 《The Journal of Adhesion》1987,21(3):261-277
The once distinct and independent theories of adhesion have been losing their isolation and converging. Ideas of the effects of surface roughness, once dismissed as irrelevant except in the case of textiles, have been revised; albeit on a smaller scale as details of surfaces have been revealed by sophisticated techniques. Electrostatic interactions across an interface have been more deeply explored and their significance recognised and expounded. Diffusion of groupings and chain segments within a polymer have been related to the possibilities of interaction with a variety of surfaces. Perhaps most important, theories of adsorption have been extended in depth. The precise nature of the molecular interactions have been recognised and quantified. In doing this the contribution of diffusion and elastoplastic phenomena have been integrated. These developments are collated and analysed to present the present understanding of the concepts. 相似文献