共查询到19条相似文献,搜索用时 125 毫秒
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离子液体作为一种"绿色溶剂",具有很多独特的物理化学性能,可以应用于自由基聚合、阳离子聚合、配位聚合、电化学聚合等反应体系。本文阐述了离子液体的特点及合成方法,介绍了离子液体在高分子合成中的应用。 相似文献
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模板剂合成锰八面体分子筛及其催化燃烧二甲醚的性能研究 总被引:1,自引:0,他引:1
以离子液体[bmin]NO3调控的溶胶凝胶法合成了氧化锰八面体分子筛(OMS-2),并采用TG-DSC、XRD、低温N2吸附、TEM、FT-IR、UV-vis、O2-TPD以及H2-TPR等方法对固体材料的结构进行了表征,考察了制备材料的二甲醚催化燃烧反应的催化性能.结果表明,合成的OMS-2材料属于cryptomelane一维隧道结构,由于离子液体同时作为模板导向剂和还原剂,因而使得OMS-2的外形以一维纳米线为主.O2-TPD和H2-TPR实验表明,OMS-2材料具有丰富的氧物种,低温下易还原,因而在二甲醚催化燃烧中表现出了良好的催化性能.二甲醚催化燃烧的起燃温度T10%为180℃,而完全燃烧温度T90%为190℃,反应产物仅有CO2和H2O. 相似文献
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含稳定骨架铁的Fe-MCM-41介孔分子筛的合成与表征 总被引:1,自引:0,他引:1
以离子液体1-十六烷基-3-甲基溴代咪唑([C16mim]+Br-)为模板剂合成了含铁介孔分子筛Fe-MCM-41,并对其结构和形态进行了表征. 研究结果表明, 用该方法合成的Fe-MCM-41不仅具有比较大的比表面积, 规则的介孔孔道结构等特征, 而且形成了双孔道结构. UV-Vis和EPR 顺磁共振的表征结果表明, 采用离子液体[C16mim]+Br-为模板剂所合成的Fe-MCM-41介孔分子筛, 铁物种能稳定地存在于介孔分子筛骨架中. 相似文献
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Conventional synthesis of inorganic materials relies heavily on water and organic solvents. Alternatively, the synthesis of inorganic materials using, or in the presence of, ionic liquids represents a burgeoning direction in materials chemistry. Use of ionic liquids in solvent extraction and organic catalysis has been extensively studied, but their use in inorganic synthesis has just begun. Ionic liquids are a family of non‐conventional molten salts that can act as templates and precursors to inorganic materials, as well as solvents. They offer many advantages, such as negligible vapor pressures, wide liquidus ranges, good thermal stability, tunable solubility for both organic and inorganic molecules, and much synthetic flexibility. In this Review, the use of ionic liquids in the preparation of several categories of inorganic and hybrid materials (i.e., metal structures, non‐metal elements, silicas, organosilicas, metal oxides, metal chalcogenides, metal salts, open‐framework structures, ionic liquid‐functionalized materials, and supported ionic liquids) is summarized. The status quo of the research field is assessed, and some future perspectives are furnished. 相似文献
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Electrochemical and bioelectrochemistry properties of room-temperature ionic liquids and carbon composite materials 总被引:1,自引:0,他引:1
Room-temperature ionic liquids (RTILs) are liquids at room temperature and represent a new class of nonaqueous but polar solvents with high ionic conductivity. The conductivity property of carbon nanotubes/RTILs and carbon microbeads/RTILs composite materials has been studied using ac impedance technology. Enzyme coated by RTILs-modified gold and glassy carbon electrodes allow efficient electron transfer between the electrode and the protein and also catalyze the reduction of O2 and H2O2. 相似文献
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Capillary electrophoretic application of 1-alkyl-3-methylimidazolium-based ionic liquids 总被引:8,自引:0,他引:8
Ionic substances with melting points at or close to room temperature are referred to as ionic liquids. Interest in ionic liquids for their potential in different chemical processes is increasing, because they are environmentally benign and are good solvents for a wide range of both organic and inorganic materials. In this study, a capillary electrophoretic method for resolving phenolic compounds found in grape seed extracts is reported. The method, in which 1-alkyl-3-methylimidazolium-based ionic liquids are used as the running electrolytes, is simple and reproducible. The separation mechanism seems to involve association between the imidazolium cations and the polyphenols. The role of the alkyl substituents on the imidazolium cations was investigated and will be discussed. 相似文献
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气凝胶具有三维纳米多孔网络结构,独特的结构使它具有低密度、高比表面积和高孔隙率等性质以及低热导率、低介电常数和低声传播速率等性能,在隔热、介电、隔声、催化、吸附等领域具有广阔的应用前景.然而,溶剂-凝胶法作为目前制备气凝胶最成熟、应用最广的技术,需要使用大量的有机溶剂,严苛而危险的超临界干燥工艺进一步推高了成本,限制了气凝胶的大规模工业化生产和应用,因此,降低成本和在常压干燥条件下制备高比表面积的块状气凝胶是气凝胶产业急需解决的问题.离子液体被称为21世纪的绿色溶剂,具有低蒸气压、低表面张力、高催化性和高溶解性等特殊性质.离子液体与气凝胶材料的发展几乎同步,但直到2000年两种材料才产生交集.离子液体作为模板剂具有微观结构导向作用,使纳米孔结构均一化,其不挥发性和低表面张力保证了老化和常压干燥过程中纳米孔结构不会因毛细管力而坍塌破坏,另外其催化作用可以缩短凝胶时间.因此,离子液体为常压干燥合成气凝胶提供了新的工艺路线.目前,有关借助离子液体制备 SiO2气凝胶、TiO2气凝胶、SiO2-TiO2复合气凝胶、炭气凝胶等无机气凝胶的探索均已展开,其中制备 SiO2气凝胶的研究最多,涉及工艺、微观结构、掺杂和应用等方面.通过常压干燥可获得比表面积高达677 m2/g 的块状气凝胶,通过选用不同的离子液体还可以控制纳米孔的微观形貌,所得 SiO2气凝胶产物在电化学、生物、吸附等领域有较高的应用潜力.利用离子液体替代有机溶剂可以使得到的TiO2气凝胶不经煅烧即含有锐钛矿相,通过金属原子 Ag、Fe、Ge等掺杂改性,可进一步提高锐钛矿相的结晶度,提升其光催化性能.利用离子液体制得的 SiO2-TiO2复合气凝胶具有一定强度和良好的光催化活性.此外,除在传统的溶胶-凝胶法中用作模板剂或催化剂外,离子液体还可作为新型的炭源用于制备炭气凝胶,即通过熔盐法高温炭化裂解离子液体"自上而下"直接制备.这种方法可以制备杂原子在原子水平上均匀分布的功能化炭气凝胶,无需制备有机气凝胶前驱物,极大缩短制备周期,并且炭气凝胶产物的比表面积相对更高,得到了科研界的广泛关注. 相似文献
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Tim‐Patrick Fellinger Arne Thomas Jiayin Yuan Markus Antonietti 《Advanced materials (Deerfield Beach, Fla.)》2013,25(41):5838-5855
This review surveys recent work on the use of ionic liquids (ILs) and polymerized ionic liquids (PILs) as precursors to synthesize functional carbon materials. As solvents or educts with negligible vapour pressure, these systems enable simple processing, composition, and structural control of the resulting carbons under rather simple and green synthesis conditions. Recent applications of the resulting nanocarbons across a multitude of fields, such as fuel cells, energy storage in batteries and supercapacitors, catalysis, separation, and sorption materials are highlighted. 相似文献
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Tsukasa Torimoto Tetsuya Tsuda Ken‐ichi Okazaki Susumu Kuwabata 《Advanced materials (Deerfield Beach, Fla.)》2010,22(11):1196-1221
Ionic liquids (ILs) including ambient‐temperature molten salts, which exist in the liquid state even at room temperature, have a long research history. However, their applications were once limited because ILs were considered as highly moisture‐sensitive solvents that should be handled in a glove box. After the first synthesis of moisture‐stable ILs in 1992, their unique physicochemical properties became known in all scientific fields. ILs are composed solely of ions and exhibit several specific liquid‐like properties, e.g., some ILs enable dissolution of insoluble bio‐related materials and the use as tailor‐made lubricants in industrial applications under extreme physicochemical conditions. Hybridization of ILs and other materials provides quasi‐solid materials, which can be used to fabricate highly functional devices. ILs are also used as reaction media for electrochemical and chemical synthesis of nanomaterials. In addition, the negligible vapor pressure of ILs allows the fabrication of electrochemical devices that are operated under ambient conditions, and many liquid‐vacuum technologies, such as X‐ray photoelectron spectroscopy (XPS) analysis of liquids, electron microscopy of liquids, and sputtering and physical vapor deposition onto liquids. In this article, we review recent studies on ILs that are employed as functional advanced materials, advanced mediums for materials production, and components for preparing highly functional materials. 相似文献
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Catalin Croitoru Anca Maria Varodi Maria Cristina Timar Ionut Claudiu Roata Elena Manuela Stanciu Alexandru Pascu 《Journal of Materials Science》2018,53(6):4132-4143
The improvement of wood-plastic composites properties by additives and compatibilizers is a critical issue to produce value-added materials. High-density polyethylene-wood composites have been obtained through compression molding at 140 °C, using two types of additives, namely methyltrioctylammonium bis (trifluoromethylsulfonyl)imide and trihexyltetradecylphosphonium bis (2,4,4-trimethylpentyl) phosphinate room temperature ionic liquids. The ionic liquids improve the interfacial adhesion between the wood and the polymer phases, contributing to an increased stability of the material to water action and to an improved impact resistance and tensile strength in comparison with the reference. Also, the FTIR spectroscopy tests have proven a higher resistance of the ionic liquid-containing composites to accelerated photooxidation. Preliminary screening tests have also proven the antifungal character of the ionic liquids used in this study against brown rot (Postia placenta). This study opens new insights in the domain of polymeric composite materials, through documenting the possibility of blending new types of chemically distinct materials, difficult to be achieved by traditional functionalization/derivatization routes. 相似文献
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Nanoparticles of silver halides have been prepared by mixing silver halide powder with a single liquid phase consisting of an ionic liquid, isooctane, n-decanol and water. Much higher nanoparticle concentrations may be formed with ionic liquids using this new simple method than are found with conventionally applied surfactants. This method also emphasizes the applicability of ionic liquids as versatile components in microemulsions and as solvents for the synthesis of nanomaterials. The effect on the nanoparticles of changing the composition of the liquid mixtures and the nature of the ionic liquid is analysed. High nanoparticle concentrations were only found with chloride based ionic liquids, indicating the importance of the ionic liquid anion in the mechanism of the reaction. 相似文献