国内纳米ATO导电粉体制备的研究现状

纳米ATO(锑掺杂二氧化锡)导电粉因其在导电和光学等方面的优良性能,在许多领域有着广阔的应用前景,是近年来迅速发展的一种新型功能材料,目前制备纳米ATO粒子的方法主要有共沉淀法、水热法、燃烧合成法等.详细介绍了纳米ATO粉体制备的国内研究现状,并总结了锑掺杂量、热处理、反应pH值等制备工艺对粉体性能的影响,最后提出了有待深入研究的几个问题.     

氧化锌铝的典型性能与研究进展

氧化锌铝是一种具有广阔应用前景和发展潜力的复合氧化物半导体材料。介绍ZAO材料的透明导电性、光致发光和红外发射等典型性能;讨论溶胶-凝胶法、水热法、沸水回流法和共沉淀法等粉体制备方法;阐述ZAO靶材的制备方法;分析溶胶-凝胶、金属化学气相沉积、磁控溅射、脉冲激光沉积和热喷雾分解等ZAO薄膜的制备技术;最后指出ZAO的发展方向。     

磁性纳米四氧化三铁颗粒的化学制备及应用进展

综述了磁性纳米四氧化三铁粒子的各种化学制备方法,包括比较常用的共沉淀法、溶胶-凝胶法、微乳液法、水热法等.根据最新的研究成果,比较了以上各种方法的优缺点,并介绍了磁性纳米四氧化三铁在磁性液体、磁记录材料、催化、生物医学、微波吸收材料等方面的具体应用.     

配合-共沉淀法制备锑掺杂二氧化锡(ATO)粉

在充分回收含锡阳极泥有价金属的基础上,采用从锡锑二次资源中直接提取的高纯氯锡酸铵和氯氧锑为原料,合成了性能优良的纳米级锑掺杂二氧化锡(ATO)粉.针对液相共沉淀法制备ATO的过程中,锡和锑的水解不同步从而未能实现真正共沉淀掺杂的问题,以(NH4)2SnCl6和Sb4O5Cl2为原料,采用配合-共沉淀法,考察了反应过程中的pH、反应温度、掺锑浓度、煅烧温度、前驱体洗涤次数和分散剂种类等对ATO粒度和形貌的影响,确定了最优化条件,即:滴定终点pH=3,反应温度60℃,锑掺杂浓度10%(质量分数),热处理温度600℃,前驱体洗涤次数为6次,采用分散剂c,并进行了实验验证.     

Ag掺杂SnO_2纳米粉体的合成与抗菌性能研究

采用水热法制备得到了Ag掺杂SnO2纳米粉体。以XRD、BET、TEM等手段对粉体进行了表征。研究发现,200℃水热合成得到的SnO2纳米粉体的晶粒尺寸为数纳米,Ag离子的掺杂抑制了SnO2晶粒的长大。经600℃热处理后,纳米粉体的晶粒明显长大,分散性能良好。抗菌测试显示,直接水热法制得的Ag掺杂SnO2纳米粉体的抗菌能力较差,而经过600℃热处理后的粉体具有优良的抗菌性能。     

Sb掺杂量对ATO纳米颗粒结构及激光吸收性能的影响(英文)

以SnCl4·5H2O和SbCl3为原料,采用共沉淀法制备不同Sb掺杂量的氧化锡锑(ATO)纳米粉末。分别采用XRD、FESEM、紫外可见分光光度计和激光器对晶体结构、形貌、激光反射率进行表征,研究Sb掺杂量对ATO纳米颗粒的结构、晶粒尺寸和激光反射性能的影响。结果表明:共沉淀法制备的ATO纳米颗粒为四方相金红石结构,粒径大小约为几十纳米;随着Sb掺杂量的增加,ATO的晶粒尺寸减小,晶胞体积则逐渐增大;与未掺杂的SnO2粉末相比,Sb掺杂后的ATO粉末在1.06μm激光波长处的反射率明显低于未掺杂的SnO2的反射率;随着Sb掺杂量的增加,反射率值呈先减小后增大的趋势,在Sb掺杂量为20%时,ATO粉末在1.06μm激光波长处的反射率低于0.02%,激光隐身性能最佳。     

纳米铜粉的研究进展

介绍了当前纳米金属材料的应用前景及其研究的重要性,重点列举纳米铜粉的主要制备方法,其中包括物理气相沉积法、高能球磨法、γ-射线辐射法、化学气相沉积法、化学沉淀法、微乳液法、溶胶-凝胶法、水热法、电解法和液相还原法等,并介绍了各种制备方法当前的研究进展及制备过程中的优缺点.还进一步介绍了纳米铜粉作为润滑油、导电涂料和催化...     

TiO2薄膜制备技术研究进展

综述了目前较常用的制备TiO2薄膜的方法,包括溶胶-凝胶法、液相沉积法、化学气相沉积法、物理气相沉积法、电沉积法、喷雾热解沉积法、原子层沉积技术、离子自组装技术和水热法等,并对各方法进行了比较.     

Sm-Co稀土永磁纳米颗粒的制备方法研究进展

介绍了Sm-Co稀土永磁纳米颗粒的化学法和物理法制备技术,主要包括水热法、共沉淀法、多元醇还原法、溶胶-凝胶法及表面活性剂辅助球磨和机械合金化法等制备方法,并对它们的优缺点及研究进展进行分析,展望了稀土永磁纳米颗粒的发展趋势。     

醋酸钙在制备四方-ZrO_2(3Y)纳米晶中的作用

以ZrOCl_2·8H_2O、YCl_3的水溶液与NH_4OH共沉淀法生成的高度无定形水合氢氧化锆(钇)为前驱物,加入醋酸钙等矿化剂以水热法制备纳米ZrO_2(3Y) 粉体.采用XRD、TEM、BET等分析技术对合成纳米粉体的相组成,粒子大小和形貌进行了表征.结果表明:在醋酸钙矿化剂存在条件下,水热合成的ZrO_2(3Y) 纳米晶体无需高温煅烧即可得四方相结构ZrO_2,晶粒尺寸dTEM为5 nm,而且结晶完全、颗粒均匀、团聚很小.     

Preparation of antimony-doped nanoparticles by hydrothermal method

Antimony-doped tin oxide (ATO) nanoparticles were prepared by the mild hydrothermal method at 200℃ using sodium stannate, antimony oxide, sodium hydroxide and sulfuric acid as the starting materials. The doped powders were examined by differential thermal analysis(DTA), X-ray diffractometry(XRD) and transmission electron microscopy(TEM). The doping levels of antimony were determined by volumetric method and iodimetry.The results show that antimony is incorporated into the crystal lattice of tin oxide and the doping levels of antimony in the resulting powders are 2.4%, 4.3%and 5.1%(molar fraction). The mean particle size of ATO nanoparticles is in the range of 25 - 30 nm. The effects of antimony doping level on the crystalline size and crystallinity were also discussed.     

Preparation of elevated-temperature intermetallic powders via a novel reaction ball milling technique

The synthesis of elevated-temperature intermetallic powders was carried out using a novel solid–liquid reaction milling technique. As opposed to the conventional mechanical milling, the direct formation of nanometer-sized elevated-temperature intermetallic powders such as Fe_1.3Sn and Fe₃Sn₂, at relatively low temperatures and an enhanced solid solubility extension of iron in lead were realized.     

Influences of dehydrating process on properties of ATO nano-powders

1　INTRODUCTIONCrystallineSbdopedtinoxide (ATO) ,cassiteritestructure ,isawidebandgapn typesemiconductor.Be causeofitsopticalproperty (transparentforvisiblelightandreflectiveforIR )andelectroconductibility ,goodchemicalandmechanicalstability ,ithasmanyapplica tions,suchastransparentconductiveelectrodes ,photo voltaicdevices ,photosensors ,catalyst,antistaticcoatingsandelectrochromicmaterials[14 ] .AvarietyoftechniqueshavebeenusedtoprepareATOsuperfinepowders ,someinvolvedryprocesses ,ot…     

Synthesis of nanocrystalline yttria powder prepared by a polymer solution route

Nanometer-scaled yttria (Y₂O₃) powders were synthesized by a polymer solution route using polyvinyl alcohol (PVA) as an organic carrier. The PVA polymer contributed to a soft and porous powder microstructure, and homogeneous precursor gels containing PVA polymer were effective in making nanometer-sized yttria powders. In this process, the content of PVA and the calcination temperature strongly affected the microstructure and crystallization behavior of the yttria powders. The homogeneous precursors were crystallized to a stable yttria phase at 600 °C for 1 h. In this paper, a simple solution technique for the fabrication of nanometer-sized yttria powders is introduced. The effects of PVA on the powder morphology and on powder specific surface area were studied. The characterization of the synthesized powders was examined by using XRD, DTA/TG, SEM, TEM, a particle size analyzer and nitrogen gas adsorption. The yttria powder synthesized from PVA with a content ratio of 4:1 revealed a crystallite size of about 15 nm with a high surface area of 34.71 m²/g.     

THE MECHANISM FOR NANOMETER-SIZED TiC SYNTHESIZING BY MECHANICAL ＆ THERMAL ACTIVATION PROCESSING

1. IntroductionA w ide variety oftechniquesare being used to synthesize nanostructured m aterials[1].M echanicalalloying (M A )hasbecom e a popularm ethod to m ake nanocrystallinem aterialsdueto the sim plicity,rel-atively inexpensive equipm entneeded, applicability to essentially allclasses ofm aterials and the re-m arkable possibility foreasily scaling up to tonnage quantities[2].Recently,reaction m illing (RM )iscon-cerned w idely forpreparation ofnanostructured m aterialsbecause thatthe …     

单分散锑掺杂氧化锡(ATO)纳米材料的制备及其自组装(英文)

通过水热法制备了单分散的锑掺杂氧化锡(ATO)纳米材料,TEM表征显示所得的ATO纳米材料分散性好,粒径小,粒度分布窄。在使用特定表面活性剂的情况下,ATO纳米颗粒表现出一些自组装的行为,颗粒组装成规则的高分散纳米球体。     

Effect of antimony doped tin oxide on behaviors of waterborne polyurethane acrylate nanocomposite coatings

A multi-functional waterborne polyurethane acrylate (WPUA) nanocomposite coating was prepared through introducing the acrylate groups into the end of the polyurethane main chains and then modified by antimony doped tin oxide (ATO) nanoparticles by ultrasonic dispersion. Structural and morphological features of coatings were assessed using Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and a 3D measuring laser microscope. Performance of the coatings was evaluated using water resistance studies, thermogravimetric analysis (TGA), dynamic mechanical thermal analysis (DMTA) and mechanical tests such as tensile strength, elongation at break. The data showed that the WPUA/ATO coatings possessed good mechanical properties and thermal stability. The UV-visible-near infrared (UV-VIS-NIR) spectra results suggested that the WPUA/ATO coatings could absorb near infrared radiation so that it would prevent heat transmission and heat diffusion effectively.     

Mechanical behavior of microstructure engineered multi-length-scale titanium over a wide range of strain rates

In this work, we studied the mechanical behavior of commercial purity Ti powder consolidates with an engineered microstructure containing multiple-length-scale features, over a wide range of loading rates. The microstructural length scales were engineered by mixing powders of different sizes, followed by either hot quasi-isostatic forging (QIF) or spark plasma sintering (SPS). We used electron backscatter diffraction and transmission electron microscopy to examine the microstructure of the Ti materials. A bimodal grain size distribution has been achieved for the majority of the QIFed samples, while those consolidated via SPS exhibit a near-equiaxed morphology. All samples synthesized with powders milled in liquid argon show considerable uniform plastic deformation under quasi-static compression, with no failure, and their strength values are considerably high when compared to those of commercial purity Ti. Moreover, the materials consolidated from milled powders exhibit adiabatic shear banding under high rate uniaxial compression via the Kolsky bar technique. Samples prepared from a preselected proportion of powders milled in liquid nitrogen showed quasi-static strength as high as 2000 MPa, and dynamic peak stress as high as 2700 MPa, comparable to the strength of high-strength steels. However, these super-strong Ti samples are brittle under both quasi-static and dynamic compression. The strengthening of these Ti materials with an engineered microstructure is primarily attributed to the presence of interstitials. Twins were observed in nanometer-sized grains in the strongest and brittle samples, along with evidence of the TiN phase, which was attributed to exposure to a high level of nitrogen introduced during milling in liquid nitrogen. The high rate behavior can be rationalized on the basis of an adiabatic shear band model that takes into account strain and strain rate hardening.     

水性透明隔热涂料中纳米 ATO 的分散技术

为解决纳米ATO在水中的分散问题,通过沉降实验和测定Zeta电位,考查了pH值、分散剂及其用量、研磨时间等对纳米ATO浆料分散稳定性的影响,得出了最佳分散条件:采用高分子型分散剂Tech-6300,pH值8～9,研磨时间为12 h。对最佳分散条件制备的ATO水性浆料进行粒径检测和透射电镜观察,结果表明,ATO水性浆料的粒径在100 nm以内,达到了纳米级别,分散稳定性较好。