共查询到20条相似文献,搜索用时 681 毫秒
1.
本文对铝合金阳极氧化电解着色及封闭膜的分区结构、氧化膜定向生长和封闭结构进行了扫描电镜显微分析和透射电子显微分析。其分析结果对铝合金精饰工艺研究具有较好的指导作用。 相似文献
2.
钛酸盐纳米管薄膜的合成、结构与性质 总被引:2,自引:0,他引:2
在水热条件下, 控制反应温度和氢氧化钠的浓度, 分别采用去离子水和盐酸进行洗涤处理, 在钛金属基底表面合成出含钠元素和不含钠元素的两种钛酸盐纳米管薄膜(TiNTW和TiNTA), 并利用X射线衍射分析、扫描电子显微镜、透射电子显微镜和能量色散X射线光谱等对其结构、组成和性质进行了表征. 结果表明, TiNTW和TiNTA均由宽约8 nm、长约1 μm的纳米管组成, 但TiNTA表现出较好的光催化活性和储氢性能, 而热稳定性弱于TiNTW, 二者在性质上的显著区别归因于2种钛酸盐纳米管薄膜的晶体结构和元素组成的不同. 相似文献
3.
Crystal orientation measurements made by electron backscattered diffraction (EBSD) in the scanning electron microscope (SEM)
and microscopic observations provided the basis for a quantitative investigation of microstructure in an yttria stabilised,
tetragonal zirconia-based (Y-TZP) composite. Automatic crystal orientation mapping (ACOM) in a SEM can be preferable to transmission
electron microscopy (TEM) for microstructural characterisation, since no sample thinning is required, extensive crystal data
is already available, and the analysis area is greatly increased. A composite with a 20 vol.% tungsten carbide (WC) content
was chosen since it revealed crystal relationships between the matrix and carbide phase already established by TEM analysis.
However, this composite was difficult to investigate in the EBSD/ SEM since it is non-conductive, the Y-TZP grain size is
of the order of the system resolution, and the sample surface, though carefully prepared, reveals a distinctive microtopography.
In this paper, some useful solutions to these problems are discussed and the resulting data, which confirm crystal correlations
previously established by TEM analysis, are presented. 相似文献
4.
将水热合成与溶剂蒸发法相结合, 以尖晶石结构的纳米铁酸镍为磁核, 成功制备了磁载钛硅分子筛. 采用傅里叶变换红外光谱仪(FTIR)、 振动样品磁强计(VSM)、 扫描电子显微镜(SEM)、 透射电子显微镜(TEM)和X射线衍射仪(XRD)等对样品进行了表征. 结果表明, 所制备的磁载钛硅分子筛颗粒呈球形, 分布均匀, 颗粒直径约为100~150 nm, 具有明显核/壳结构和超顺磁特征. 磁载钛硅分子筛在环己酮氨肟化反应中表现出良好的催化活性, 环己酮转化率达到98%, 产物选择性在97%以上. 相似文献
5.
采用蒸发诱导自组装法制备了高度有序的TiO2介孔薄膜. 利用X射线衍射(XRD)、扫描电子显微镜(SEM)和透射电子显微镜(TEM)等分析手段对其进行了表征. 结果表明, 所得样品的孔径约为5 nm, 孔道规则, 且骨架为纯锐钛矿结构. 紫外-可见光谱(UV-Vis)的表征结果表明, 制备的TiO2介孔薄膜对波长小于380 nm的紫外线有很强的吸收. 对TiO2介孔薄膜的I-V(电流-电压)特性进行了表征, 发现加光后其I-V曲线由暗态时的肖特基特性转变为欧姆特性, 表明TiO2介孔薄膜对紫外光有很敏感的光电响应. 相似文献
6.
7.
8.
9.
10.
11.
Room temperature ionic liquids have attracted much research attention for the preparation of nanoparticles owing to their nonvolatile nature, thermally stable properties and inflammability. In this contribution, we have made an effort to fabricate the late transition metal — Ru, Rh, Ir, Ni, Pd, Pt, Ag, and Au — nanostructures by thermal decomposition of the corresponding organometallic precursors in the presence of various surfactants in ionic liquid [Omim][PF6]. Silver nanowires can be specifically generated by heating the mixture of (hfac)Ag(PMe3) and 1‐hexadecylamine with the mole ratio of 1:10 in [Omim][PF6] at 140 °C for 3 h. Characterization of these metal nanostructures were carried out by transmission electron microscope (TEM), scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), and X‐ray powder diffraction analysis. 相似文献
12.
Zhang L Ai Z Jia F Liu L Hu X Yu JC 《Chemistry (Weinheim an der Bergstrasse, Germany)》2006,12(15):4185-4190
Various nanostructured films of copper and silver tellurides were hydrothermally grown on the corresponding metal substrates through reactions between metal foils and tellurium powder in different media. Interesting morphologies including nanowires, nanorods, nanobelts, nanosheets, and hierarchical dendrites were obtained. The nanostructured films were characterized by using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and high-resolution TEM (HRTEM). A growth mechanism was proposed based on the characterization results. This study provides a low-temperature, solution-phase approach to grow low-dimensional, nanostructured metal tellurides with controllable morphologies. 相似文献
13.
H. Hassander 《Polymer Testing》1985,5(1):27-36
The possibility of using a scanning electron microscope (SEM) for studying the morphology of mechanical polymer blends was investigated. Compounds of SBS/EPDM, and both filled and unfilled NBR/EPDM were tested. OsO4-stained thin-sections were also examined in a transmission electron microscope (TEM) and the results were compared.It seemed to be quite possible to use atomic number contrast detection in combination with OsO4 staining for visualizing the morphology of the blends in SEM. Domains as small as 0·1 μm were clearly seen. This was done by means of a Robinson backscattered electron detector. Sample preparation was easy, 2 mm thick rubber plates were cut on dry ice to obtain a smooth surface. After staining, the samples were coated with a thin conductive carbon layer.The inner structures of SBS and the carbon black particles were not resolved in SEM but were easily seen in TEM. 相似文献
14.
Flexible thin films of metal–carbon nanotube (CNT) with densely populated CNT morphology were fabricated by electrodeposition from an optimized copper bath. The substrate used for the present work is polyethylene film that was pre-deposited with electroless copper as a seed layer before CNT deposition. Optimum concentration of CNT was incorporated into copper bath and the electrodeposition was done at quiescent and agitation conditions. The bonding between the seed layer and the electrodeposited copper was good as revealed from adhesion test. Electrical as well as physical-mechanical property of the film was improved by CNT incorporation within the metal matrix. The topography and the texture of the metal–CNT deposit showed a well-refined structure as per scanning electron microscope (SEM), field emission scanning electron microscope (FE-SEM), and scanning probe microscope (SPM) analysis. The stability of the film was tested by cyclic voltammetric and stripping analysis under various applied conditions. Raman spectra and Fourier transfer infrared spectroscopic (FT-IR) analysis revealed the presence of CNT and the functionality of CNT within the copper matrix. Transmission electron microscope (TEM) analysis showed nucleation of copper on the surface of CNT walls. 相似文献
15.
16.
Ruby Chauhan Ashavani Kumar Ram Pal Chaudhary 《Journal of Sol-Gel Science and Technology》2012,63(3):546-553
Ag-doped ZnO nanoparticles (Zn1?xAgxO; where x = 0.00–0.05) were synthesized by chemical precipitation method. The synthesized products were characterized by X-ray diffraction, scanning electron microscope (SEM), transmission electron microscope (TEM) and UV–Vis spectrometer. The SEM and TEM micrographs revealed the agglomerated spherical-like morphology and the measurements show that the size of crystallites is in the range of 10–40 nm. Optical measurements indicated a red shift in the absorption band edge after Ag doping. The band gap values of as prepared undoped and doped with silver samples were found to decrease with increase in temperature from 300 to 800 °C. Photocatalytic activities of ZnO and Ag doped ZnO were evaluated by irradiating the sample solution to ultraviolet light by taking methylene blue as organic dye. The experiment demonstrated that the photo-degradation efficiency of 1 mol% Ag-doped ZnO was significantly higher than that of undoped and 2–5 mol% Ag doped ZnO under ultraviolet light irradiation. 相似文献
17.
18.
为了改善纳米二氧化钛的光催化活性,通过水热法制备了氮钨共掺杂二氧化钛纳米棒。通过扫描电镜(SEM),X射线衍射(XRD),透射电镜(TEM),X射线光电子能谱(XPS)和紫外可见光吸收光谱(UV-VIS)法等对产物进行了相关表征。结果显示,与未掺杂的二氧化钛相比,氮钨共掺杂的二氧化钛纳米棒在可见光区域显示出了较强的光催化活性。因为氮钨阳离子的掺入拓宽了可见光的吸收区域。 相似文献
19.
Mesoporous semimetal bismuth film and magnetic metal nickel and cobalt thin films have been electrodeposited from hexagonal or lamellar structured lyotropic liquid crystalline phases with polyoxyethylene surfactant. The liquid crystalline templates are characterized by low-angle X-ray diffraction (XRD) and polarized-light optical microscopy (POM). The metal films are characterized by low-angle and wide-angle XRD, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The magnetic measurements on the mesoporous nickel and cobalt films are shown to have higher coercivity (Hc) than the nonporous polycrystalline films. 相似文献
20.
利用多孔氧化铝作模板采用熔融法成功制备了一种定向有序排列的有机小分子 (NPB)纳米管 ,并用场发射扫描电镜 (FESEM)、X射线能量损失谱 (EDX)、透射电子显微镜 (TEM)和荧光显微镜对其进行了表征 .发现该纳米管具有整齐的形貌和规整的尺寸 .进一步的研究表明 ,多孔氧化铝模板的亲油亲水处理对能否成功地大量获得纳米管起到非常重要的作用 .值得注意的是 ,在对不同尺寸纳米管材荧光光谱的测定中 ,可明确观察到材料光学性质的尺寸依赖性 . 相似文献