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硬模法制备无机空心球的研究进展 总被引:2,自引:0,他引:2
结构与组成可控、性能可调的微米-亚微米尺度的无机空心球具有极大的应用潜力.系统评述了胶粒模法和胶囊模法等无机空心球的硬模制备方法,阐述了硬模法在均相母液和非均相母液中的不同成壳机制,综述了硬模法制备无机空心球的相关应用及最新进展. 相似文献
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结构与组成可控、性能可调的微米-亚微米尺度的无机空心球具有极大的应用潜力.系统评述了以气腔、液滴为模板的无机空心球软模制备方法及其应用,以及软模法制备无机空心球的最新进展. 相似文献
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有机-无机杂化材料研究进展 总被引:42,自引:0,他引:42
综述了有机-无机杂化材料的制备方法及影响材料结构和性能的因素,并对有机-无机碳化材料在力学,光学,电学等领域的应用进行了简要的评述。这类性能优异的新材料在未来的高科技领域必须有广阔的应用前景。 相似文献
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将腐植酸和Fe3+在氧化铝纤维上进行层层自组装,自组装40双层以后,在N2气氛下于1000℃下碳化,碳化后在装纤维的坩埚上沉积了一层黑色具金属光泽的物质,应用FESEM、EDX、Ra-man、XRD对这一物质进行了分析。结果表明,这层黑色物质是尺寸在几十到几百纳米的空心球,这些纳米空心球主要由C构成,还含有少量Fe、O,Fe元素以FeO和FeC3的形式存在,碳空心球的石墨化和有序程度较低,且与相同条件下纤维上所得碳材料的拉曼光谱存在较明显区别。 相似文献
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《高分子材料科学与工程》2012,(1):4-4
本发明提供了一种聚酰亚胺/无机纳米杂化材料制备方法,首先合成适用于聚酰亚胺的无机纳米粒子改性剂——亚胺环基硅烷;采用溶胶-凝胶法制备无机氧化物纳米粒子,在溶胶一凝胶反应过程中加入改性剂亚胺环基硅烷,得到有机-无机复合体纳米颗粒;将有机-无机复合体纳米颗粒均匀分散于聚酰胺酸溶液中,经过加热处理得到聚酰亚胺/无机纳米杂化材料。本发明的聚酰亚胺/无机纳米杂化材料制备方法解决了纳米粒子分散的难题,在聚酰亚胺/无机纳米杂化材料中纳米粒子分布均匀,不团聚,有利于其各项性能的充分发挥。 相似文献
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近年来,无机纳米中空球由于其独特的结构特点,表现出普通材料不具备的性能,引起研究者广泛的兴趣.阐述了当前模板法合成无机纳米中空球材料的研究现状包括合成方法、合成现状及机理,并提出当前无机中空球合成存在问题及展望.希望有关无机中空球材料的研究能够不断完善,发挥其潜在的应用价值. 相似文献
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氧化锌空心球的制备及光致发光特征 总被引:3,自引:0,他引:3
采用水热和硬模板辅助技术,成功制备得到ZnO空心球结构.以葡萄糖和锌盐为原料,首先通过催化葡萄糖聚合-原位离子吸附一步进行(一步法)或葡萄糖聚合成球-离子吸附分步进行(二步法)制备锌/炭复合微球,然后经空气低温氧化制得ZnO空心球.用XRD、SEM、TEM研究产物的组成和结构及形貌,用光致发光光谱(PL)测试产物的室温光致发光性能.研究发现,两种方法得到的空心球壳均属多孔结构,由ZnO纳米粒子构成;与聚合-吸附分步法相比,聚合-原位离子吸附一步法更加简单快捷;制得的ZnO空心球结构材料具有良好的近紫外发光性能.对ZnO空心球结构的形成过程和可能的机制进行了分析和讨论. 相似文献
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采用锡盐溶液浸渍-煅烧锯末法,制备了SnO2纳米空心球.分别用X射线衍射(XRD)、透射电子显微镜(TEM)、高分辨透射电子显微镜(HRTEM)及恒流充放电技术对产品的结构形态和电化学性质进行了表征.结果表明,SnO2空心球的尺寸在50~120nm之间,壳层厚度约为5nm.在作为锂离子电池正极使用时,初始放电容量为607.7 mAh g-1. 相似文献
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Chuanlong Han Shiping Wang Jing Wang Mingming Li Jiang Deng Haoran Li YongWang 《Nano Research》2014,(12):1809-1819
Encompassing ecological and economic concerns, the utilization of biomass to produce carbonaceous materials has attracted intensive research and industrial interest. Using nitrogen containing precursors could realize an in situ and homogeneous incorporation of nitrogen into the carbonaceous materials with a controlled process. Herein, N-doped hollow core-disordered mesoporous shell carbonaceous nanospheres (HCDMSs) were synthesized from glucosamine hydrochloride (GAH), an applicable carbohydrate-based derivative. The obtained HCDMSs possessed controlled size (-450-50 nm) and shell thickness (-70-10 nm), suitable nitrogen contents (-6.7-4.4 wt.%), and Brunauer-Emmett-Teller (BET) surface areas up to 770 m^2.g^-1. These materials show excellent electrocatalytic activity as a metal-free catalyst for the oxygen reduction reaction (ORR) in both alkaline and acidic media. Specifically, the prepared HCDMS-1 exhibits a high diffusion-limited current, and superior durability and better immunity towards methanol crossover and CO poisoning for ORR in alkaline solution than a commercial 20 wt.% Pt/C catalyst. 相似文献
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A ternary system of SiO2-CaO-P2O5 hollow nanospheres has been successfully prepared by sol-gel method using polystyrene (PS) nanospheres as template. The inorganic shell was produced using tetraorthosilicate (TEOS) as the silica source and tri-calciumphospate as calcium and phosphorus sources, respectively. The positive surface charge of the template and the [template]/[TEOS] ratio were the key parameters for the creation of a stable primary inorganic network and the further growth of the shell. The removal of the polymeric core through a thermal treatment procedure created an inner void space with mean diameter 250 nm while the outer mean diameter was 330 nm. 相似文献
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The polyaniline composition by silica based mesoporous hollow nanosphere (silica-HNS) was synthesized and selected as a promising solid support for palladium nanoparticle stabilization. Then the nanocomposite was applied as a nanocatalyst for aerobic benzyl alcohol oxidation reactions. Catalyst recyclability showed six successful runs for the reaction. TEM and SEM-EDX/mapping images were used to study the structure and morphology of the PdNPs@PANI/HNS. FT-IR spectroscopy, Thermal gravimetric analysis (TGA), and BET were used to characterize and investigate the catalyst nature. In addition, the amounts of Pd loading were characterized by ICP-AES technique. 相似文献
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Shuhui Li Hongliang Zhang Guoxu Wang Lei Liu Yifeng Yu 《Fullerenes, Nanotubes and Carbon Nanostructures》2017,25(8):493-496
We prepare the hollow carbon nanospheres (HCNs) by employing SiO2 nanospheres as hard template, 5-Hydroxymethylfurfural (HMF) as carbon precursor under hydrothermal conditions. The HCNs show uniform spherical morphology copied from SiO2 nanospheres and exhibit large cavity, thin shell structure with the surface area of 790 m2 g?1 and pore volume of 2.23 cm3 g?1. Owing to their large internal voids and high surface area, the HCNs exhibit a promising prospect for CO2 capture with the capacity of 3.04 mmol g?1 at 1.0 bar and 298 K, as well as good recyclability for CO2 after ten adsorption-desorption cycles. 相似文献
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Jun Feng Fu Li Yu-Jun Bai Fu-Dong Han Yong-Xin Qi Ning Lun Xi-Feng Lu 《Materials Chemistry and Physics》2013
Hollow graphitic carbon nanospheres (HGCNSs) were synthesized on large scale by a simple reaction between glucose and Mg at 550 °C in an autoclave. Characterization by X-ray diffraction, Raman spectroscopy and transmission electron microscopy demonstrates the formation of HGCNSs with an average diameter of 10 nm or so and a wall thickness of a few graphenes. The HGCNSs exhibit a reversible capacity of 391 mAh g−1 after 60 cycles when used as anode materials for Li-ion batteries. 相似文献
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