共查询到19条相似文献,搜索用时 93 毫秒
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目的分析影响植物纤维多孔材料泡孔分布的各种因素,探究泡孔结构对性能的影响,为制备泡孔均匀分布、缓冲性能良好的多孔材料提供理论基础。方法归纳总结国内外植物纤维多孔材料泡孔结构的研究进展,探讨多孔材料的发泡机理,系统地阐述成型工艺、助剂种类、助剂含量等对植物纤维多孔材料泡孔结构的影响。结果通过分析得出各种影响因素的作用规律,为进一步完善植物纤维多孔材料的制备方案,开发泡孔分布均匀、性能稳定的植物纤维发泡材料提供依据。结论通过制定科学的实验方案,可以制备出泡孔分布均匀的多孔材料,其可作为缓冲材料,在包装领域中有巨大的市场需求。 相似文献
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锰氧化物作为最常见的过渡金属氧化物之一,是一种极具潜力的材料,可通过改变其晶型、形貌、比表面积和氧空位数量等调节催化活性、吸附能力、稳定性等性能。调控MnO_(X)的晶体结构及形貌以提高其性能,一直是国内外学者极为关注的问题。本文分析了不同晶型二氧化锰(α,β,γ,δ,λ)的结构特点及其与催化/吸附性能之间的构效关系,系统总结了不同形貌MnO_(X)(纳米棒、纳米片、纳米花、纳米球)的制备方法及结构特点,并介绍了锰氧化物近年来在能源(生物质催化转化、电化学)及环境治理(气体污染物分解、重金属吸附、有机污染物降解)中的典型应用。最后,对锰氧化物存在作用机制复杂、稳定性较差等问题进行了分析。尽管锰氧化物在研究过程中还存在问题,但其作为一种重要的金属氧化物,未来在环境、能源等领域中的应用前景十分广阔。 相似文献
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We report a facile approach to the preparation of porous manganese oxide materials by the organic-electrolyte templates based on strategy. The final products are thoroughly characterized by X-ray diffraction (XRD), thermogravimetric analysis (TGA), field-emission scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), inductively coupled plasma-optical emission spectroscopy (ICP-OES), and Brunauer–Emmett–Teller (BET) techniques. The results reveal that porosity (pore size and distribution, surface area) of these manganese oxides has strong relationship with the templates used, which implies a simple way to obtain a series of porous materials. By comparing the catalytic effects of these manganese oxides in oxidation of indene and benzyl alcohol, we find that the pore size and distribution are also crucial to the catalytic properties of these porous materials. 相似文献
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V. P. Pashchenko A. A. Khor’yakov A. V. Pashchenko Yu. S. Prilipko A. A. Shemyakov 《Inorganic Materials》2014,50(2):191-196
Detailed studies of manganese zinc ferrites for electronic applications are used to assess the effect of oxygen nonstoichiometry on their structural, electrical, and magnetic properties. The optimal synthesis conditions and nonstoichiometry are determined which ensure the preparation of high-permeability manganese zinc ferrites with low electromagnetic energy losses. The manganese zinc ferrites are shown to be attractive as materials for high-performance magnetoresistive electric current and magnetic field sensors and spintronic devices. 相似文献
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对国内外层状二氧化锰的制备方法及相关锰氧化物的应用现状进行综述,详细总结层状二氧化锰主要的制备方法,如固相反应法、水热合成法、溶胶-凝胶法、液相氧化-还原法等,对层状二氧化锰在锂电池电极材料、阳离子交换材料、吸附材料及污染物处理材料等领域的应用进行概述,并对其未来的发展趋势进行展望。结果认为:层状二氧化锰的制备与使用仍是今后一段时间内重点发展对象。固相法是在实际生产和研究实验中应用最多的一种方法,而液相法则因低投入、低能耗、污染小,是值得大力发展和推广的制备工艺路线。制备技术的不断成熟将使层状二氧化锰具有更广阔的应用前景。 相似文献
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《Current Opinion in Solid State & Materials Science》1998,3(2):175-180
The extremely strong coupling of conduction electrons with local spins in transition metal oxides leads to many intriguing electronic and optical properties, which are currently of great interest. Among these intriguing properties, the discovery of colossal magnetoresistance in manganese oxides has sparked a number of studies on the magnetic and electronic properties of these materials as well as the exploration of the relevant new materials phase. 相似文献
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锰氧化物通常以各种隧道构造、层状构造的化合物存在。这些锰氧化物作为锂离子二次电池正极材料显示了优越的电化学性质,其电气特性依据锰氧化物结晶构造和合成条件的不同而存在很大的差异。本文对于隧道状及层状锰氧化物的结晶构造、合成及其作为锂离子二次电池正极材料所显示的电气特性等进行了评述。 相似文献
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Z.W. Chen Z. JiaoM.H. Wu C.H. ShekC.M.L. Wu J.K.L. Lai 《Progress in Materials Science》2011,56(7):901-1029
This review article introduces the preparation methodologies and the microstructural characteristics of semiconductor thin films, including SnO2 thin films, Au/Ge bilayer films, and Pd-Ge alloy thin films, and metal oxides, including SnO, SnO2, Mn2O3 and Mn3O4 nanocrystals which can be in the form of nanoparticles, nanowires, nanorods, and nanofractals. Firstly, the preparation methodologies and the microstructural characteristics of tin oxides have been investigated in detail and described in Section 2. Secondly, the crystallization of amorphous Ge, and the formation of nanocrystals and compounds developed with improved micro- and nanostructured features are described in Section 3. Thirdly, a novel selective synthesis route for various morphologies of manganese oxides nanocrystals, including nanoparticles, nanorods and nanofractals, and their unique microstructural characteristics are presented in Section 4. Intricate fundamental properties of manganese oxides nanocrystals are studied in detail. To sum up, it is expected that the fabrication methodologies developed and the knowledge of microstructural evolution gained in semiconductor thin films, including SnO2 thin films, Au/Ge bilayer films, and Pd-Ge alloy thin films, and metal oxides, including SnO, SnO2, Mn2O3 and Mn3O4 nanocrystals in the forms of nanoparticles, nanowires, nanorods, and nanofractals, will provide an important fundamental basis underpinning further interdisciplinary (physics, chemistry and materials science) research in this field leading to promising exciting opportunities for future technological applications involving these oxide and thin film materials. 相似文献
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静电纺丝法制备氧化锰纳米丝电极及其电化学性能 总被引:1,自引:0,他引:1
利用静电纺丝技术成功制备了φ60~80nm的氧化锰纳米纤维丝,并构建了三维纳米丝网状结构电极,应用于锂离子二次电池. 使用扫描电子显微镜、X射线衍射、循环伏安和电池充放电等研究手段,表征了纳米纤维丝的结构和电化学性能. 研究结果发现:氧化锰构建的纳米丝在嵌锂和脱锂的过程中没有出现纳米纤维丝的结构塌陷问题,在高能量密度下表现出较大的可逆循环容量,放电容量达到160mAh/g. 经过50次循环后, 容量可达132.5mAh/g, 平均每次循环的容量衰减在1%以下. 这些结果表明了氧化锰纳米纤维丝可作为三维锂离子电池中的阴极材料. 相似文献