石墨烯载钴材料的制备

本实验以150μm鳞片状石墨为原料,采用Hummers法制备氧化石墨,经超声波振荡得到氧化石墨烯,加入水合肼回流制得石墨烯材料.氧化石墨烯与CoSO4溶液混合,采用功能离子预吸附的方式,将金属离子有效地分散在氧化石墨烯载体上,原位还原金属颗粒和石墨烯,制备石墨烯载钴材料.     

Preparation of Mineralized Electrospun Fibers as a Biomimetic Nanocomposite

Mineralization of gelatin electrospun nano and micro fiber was investigated in order to prepare a biomimetic bone nanocomposite. For this aim, at first, calcium containing gelatin nanofibers were electrospun by a novel ethanol/water/salt solution. Fibers with mean diameters varying from 300 to 3000 nm were acquired. Then, fiber mats were exposed to phosphate ions by soaking them in phosphate solution or laminating them between phosphate containing gelatin films. SEM micrographs demonstrated the presence of nano to micro sized minerals on gelatin fibers. FTIR and XRD results illustrated that the calcium phosphates in all samples are combinations of brushite and hydroxyapatite.     

Preparation of a Translucent, Conductive, Porous Nanocomposite

A translucent, conductive, porous nanocomposite was designed and prepared by depositing SnO₂ on the inner surfaces of the pores of a porous glass plate and on its outer surface using a chemical vapor deposition method. The porous nanocomposite almost maintained its large surface area and pore volume because the pores remained open after they were deposited with SnO₂. Conductivity between the two outer surfaces of the nanocomposite plate was confirmed for the first time.     

八水氢氧化钡制取高纯碳酸钡的研究

介绍八水氢氧化钡制取高纯碳酸钡的工艺,产品质量及用户使用结果。     

八水氢氧化钡制取高纯碳酸钡

介绍八水氢氧化钡制取高纯碳酸钡的工艺、产品质量及用户使用结果。     

Preparation of Barium Titanates from Oxalates

The decomposition of mixed barium titanium oxalates was studied by means of various thermochemical as well as spectroscopic methods. Infrared (IR) spectra of the mixed oxalates indicate the existence of an octahedral complex with Ti chelated by oxalate groups. In general, the results of both IR and the thermochemical analyses suggest that the oxalates are first converted to unidentate carbonate, then to ionic carbonate, and finally to mixed oxides of perovskite structure. The decomposition processes were found to depend upon the atmosphere. In the presence of oxygen the stoichiometrically mixed oxalates decompose by forming TiO₂ and BaCO₃ as intermediates. Under vacuum, two routes of decomposition occur in parallel. In one route, TiO₂ and BaCO₃ are formed as intermediates; in the other, partially reduced TiO_x(x < 2) is formed, which further reacts with BaCO₃ to produce also BaTiO₃, CO₂ and CO.     

Peroxo-oxalate Preparation of Doped Barium Titanate

The peroxo-oxalate complexation method is a method that can be used for the preparation of doped barium titanate. In this paper we focus on BaTi_0.91Zr_0.09O₃, which can be used for discharge capacitors in lamp starters. The preparation method described here is based on the complexation and subsequent precipitation in basic environment of Ba, Ti, and Zr ions with hydrogen peroxide and oxalate. The influence of several process parameters, like precipitation temperature and pH, on powder properties is described. A single-phase perovskite crystal structure is obtained after calcination starting from a chloride precursor solution using a precipitation temperature of 40°C and a pH of 9. Because the peroxo-oxalate process starts with inexpensive chlorides and is performed in air, the peroxo-oxalate process is suitable for the commercial production of doped barium titanate.     

Preparation of Pectin–ZnO Nanocomposite

Pectin–ZnO nanocomposite was prepared in the aqueous solution condition at room temperature. The Fourier transform infrared, X-ray diffraction, and transmission electron microscope (TEM) measurements confirmed the nanoscaled structure of pectin–ZnO composite. According to the TEM observation, the average composite granules size was about 150 nm and the embedded ZnO nanoparticles were uniform with an average diameter of 70 nm.     

橡胶/蒙脱土纳米复合材料的制备技术进展

橡胶／蒙脱土纳米复合材料具有优异的特性，如补强性、阻隔性和透明性，因而成为橡胶工业中研究的重点方向之一。总结了近年来国内外关于橡胶／蒙脱土纳米复合材料的研究报道，重点介绍了橡胶／蒙脱土纳米复合材料的结构、制备技术和插层机理。     

SBS/黏土纳米复合材料的制备方法探究

探索了SBS／黏土纳米复合材料的制备工艺，将经过特殊有机化剂有机化的有机土按4％添加量改性SBS橡胶，采用先高速剪切再超声波处理工艺，能有效地提高SBS的性能。     

有机-无机纳米复合功能材料的研制

将经过表面化学修饰的纳米粒子引入聚合胶体，制备了一系列具有特殊功能的有机-无机纳米复合薄膜材料. 聚合胶体通过控制硅氧烷前驱物的水解-聚合过程制备，纳米粒子包括ZrO2, SiC, AlOOH和ZnO等. 纳米粒子经过溶胶-凝胶过程对其进行表面改性，以改善其分散性能、优化界面结合或防止体系中有机组份的老化. 纳米粒子的作用主要是赋予传统的有机-无机杂化材料“第三功能”，如耐擦伤、耐腐蚀、抗紫外线等性能.     

聚苯乙烯-蒙脱土插层复合材料的制备与性能

首先对钠蒙脱土进行有机处理,使其为有机蒙脱土。ＩＲ,ＸＲＤ表明,有机阳离子已和钠蒙脱土发生离了交换作用,同时使层间距变大。然后利用熔融插层法制备了聚乙烯－蒙脱土层复合材料,和纯聚苯乙烯及常规填充聚苯乙烯相比,所得插层复合材料的热性能和力学性能都有提高,在不牺牲材料冲击强度的情况下,复合材料的模最胡着蒙     

Preparation of High-Purity Submicron Barium Titanate Powders

Simultaneous hydrolytic decomposition of barium bis isopropoxide and titanium tetrakis tertiary amyloxide was used to produce stoichiometric BaTiO₃. The particle size range was 50 to 150 Å. The purity was 99.98+%, the major contaminant being silicon from the glass apparatus. The homogeneity and stoichiometry of the powder were demonstrated by electron microscopy and wet chemical analysis. X-ray and infrared analyses indicate that the material, as-prepared and helium-dried at 5O°C, has the titanate crystal structure. The powder sinters at 1300°C to a high density, translucent body with a uniform microstructure. The experiments suggest that the alkoxy-based preparation of oxides may provide a broad base for improving the quality and reproducibility of electrical and structural ceramics.     

碳酸钡的应用及制备

介绍了碳酸钡的用途和生产技术 (包括近年来公布的发明专利 ) ,简要评述了某些技术的优缺点。对当前国内外的生产和销售状况作了分析比较 ,着重指出了我国碳酸钡工业的有利和不利条件 ,从宏观上提出了改进和发展的策略。     

正十二烷硫基硼酸钡摩擦学性能研究

合成了一种油溶性化合物正十二烷硫基硼酸钡(Ba-SB),并将其作为润滑油添加剂,采用四球摩擦磨损试验机评价了其摩擦学性能。结果表明:该添加剂具有较好的油溶性能和热稳定性能。十二烷硫基硼酸钡使HVI500基础油的抗磨性能明显改善,承载能力得到明显提高,摩擦系数明显降低,采用扫描电镜对钢球磨斑表面形貌进行分析,加了该添加剂的钢球磨斑表面平整、光滑,犁沟浅且钢球磨斑表面有沉积物,从EDS谱图上可以看出摩擦副表面含有B、N、Cr、Fe、S元素。从XPS分析添加剂在摩擦过程中发生了摩擦化学降解反应,并在摩擦副表面生成了BaO,B2O3和FeB的个物质抗磨减摩膜,从而改善了其摩擦磨损性能。     

纳米硫酸钡的制备及表征

以硫酸钠和碳酸钡为原料,碳酸钡经过浆化处理后,与硫酸钠直接反应制备纳米硫酸钡。实验考察了浆化溶剂用量对纳米硫酸钡粒度的影响,随着浆化溶剂用量的增加,纳米硫酸钡的产率提高,颗粒分布更均匀,粒径更小。经SEM和XRD测试分析,计算得出粒子的平均粒径为20nm左右。结果表明,该法可以制备出粒径小、分布窄的纳米硫酸钡粒子。     

环氧树脂/膨润土纳米复合材料的制备

本文制备了有机膨润土和环氧树脂／膨润土纳米复合材料，利用X－ray衍射对有机膨润土和纳米复合材料进行了表征，分析了烷基铵链在澎润土及其复合材料中的聚集状态。     

Beta/碳纳米复合分子筛膜的制备

利用浸渍提拉方法,在平均孔径500 nm的管状a-Al2O3陶瓷管载体上成功制备了无缺陷的Beta/碳纳米复合分子筛膜. 通过室温下单组分气体渗透实验,发现当Beta分子筛在聚糠醇/丙酮溶液中的含量逐渐加大时,复合膜的气体分离因数略有增加,同时气体渗透通量明显加大. 经优化后氢气渗透通量比纯碳膜增加了一个数量级,说明Beta分子筛起到了加快气体渗透通量的作用. 由SEM照片可以发现,随着Beta分子筛含量的增加,制备的纳米复合膜的厚度由平均14 mm减少到7 mm左右,从而减少了气体渗透的阻力.结合实验数据,探讨了沸石分子筛/碳复合膜气体渗透路径.     

Preparation of a Bioactive Poly(methyl methacrylate)/Silica Nanocomposite

The nanocomposite of a poly(methyl methacrylate)/silica containing calcium salt was synthesized through the sol–gel method. Methyl methacrylate was co-polymerized with 3-(trimethoxysilyl)propyl methacrylate and then co-condensed with tetraethyl orthosilicate and calcium nitrate tetrahydrate. Low crystalline hydroxycarbonate apatite was successfully formed on the surface after soaking in simulated body fluid for 1 week at 36.5°C. This study demonstrates that this nanocomposite may be used as a bioactive bone substitute or filler for poly(methyl methacrylate) bone cement.     

纳米复合镀层的制备及性能研究

以铁片作为基材,采用电镀工艺制备Ni-ZrO2纳米复合镀层。研究了温度、pH值、时间及ZrO2的质量浓度对复合镀层性能的影响。通过实验得出最佳的工艺参数为:ZrO21.5g/L,pH值4～5,50℃,60min。采用扫描电子显微镜观察复合镀层的微观形貌,并通过XRD分析其相组织成分。结果表明:复合镀层表面光亮,微粒均匀、细小;其相组织成分主要为Ni,ZrO2和Ni-ZrO2。