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纳米晶氧化锡的水热合成与表征 总被引:11,自引:0,他引:11
以水热法合成了高比表面积的纳米晶SnO_2粉体,运用FT-IR,XRD,BET,TEM 等手段对粉体的晶化过程进行了分析表征。FT-IR显示120 ℃水热得到的粉体即实 现水合锡化合物的晶化。XRD分析表明所得粉体均匀数纳米,且随水热温度的提高 ,晶粒长大。水热粉体均具有很高的比表面积。TEM显示粉体呈单分散状态。将水 热粉体进行热处理,粉体则长大较快,比表面积降低,分散性能出现反常改善。 相似文献
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ATO纳米粉体的燃烧合成研究 总被引:7,自引:1,他引:7
锑掺杂氧化锡(Antimony鄄dopedtinoxideATO)是一种新型多功能材料,具有耐高温、耐腐蚀、机械稳定性好的特点而被广泛应用。作为新型导电填料,可用于材料的抗静电,其效果优于传统的碳黑、金属粉体,表面活性剂等,性价比高于最近提出的碳纳米管导电材料。用于电致变色材料可以替代 相似文献
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Crystalline tin oxide nanoparticles were synthesized by the direct precipitation from the starting material granulated tin. TG-DTA of the precursor showed a heavy weight loss at about 130℃ accompanied by an endothermic peak, two exothermic peaks above 200℃ accompanied by small weight loss indicated the decomposition and the oxidation of residual NO3- ion and PEG. XRD showed that obtained particles agreed well with the determination result of bulk SnO2. The broadened XRD patterns became sharper as the calcining temperature turned to higher, it was indicated that the growth of the particle was exhibited. The surface area of the particles calcined at 300℃ was 161.1m2·g-1 and declined as the calcining temperature turned to higher. TEM showed an heavier agglomeration at higher temperature. 相似文献
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α-Fe2O3纳米微粒的制备及其Mössbuer谱研究 总被引:2,自引:0,他引:2
α-Fe2O3 nanoparticle with diameter of 10 nm was prepared by high energy ball milling directly from coarse α-Fe2O3 powders. It was found that the Mossbauer spectrum of the α-Fe2O3 nanoparticle at room temperature showed magnetic splitting sexlet lines broadened asymmetrically toward the central peaks .The asymmetric broadening of the spectral peaks could be attributed to the collective magnetic excitations. The anisotropic constant of the α-Fe2O3 nanoparticle exhibited a very high value (K=8.9×103J•m-3). 相似文献
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高度分散的Pt/TiO2的制备及光催化活性 总被引:1,自引:0,他引:1
用柠檬酸作为空穴捕获剂和分散剂, 在温和条件下用光催化还原法将3 nm金属铂沉积在7 nm的锐钛矿相及介孔二氧化钛纳米晶表面. TEM观察显示铂的负载量为w=1.0%时, 多数二氧化钛纳米晶表面沉积了岛状的铂团簇, XPS和电子衍射结果表明铂以游离态存在. 负载w=1.0%~2.0%铂的TiO2在苯酚光氧化反应中活性显著提高. Pt/TiO2在氨气中经550 ℃氮化, 可制得氮掺杂的Pt/TiO2可见光光催化剂, 氮化过程中铂团簇没有烧结和显著长大. 相似文献
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, 本文研究了Y-TZP陶瓷中ZrO2晶粒大小对ZrO2相组成和应力诱导下可相变的四方相含量以及材料力学性能的影响。发现在样品中四方ZrO2的含量并非随晶粒尺寸减小而单调地增加。实验结果是当ZrO2晶粒大小在一最佳晶粒尺寸范围内时,样品中四方ZrO2的含量和在应力诱导下可相交的四方相含量都最高,同时材料的强度与断裂韧性也最佳。对于相同组分的Y-TZP样品来说,断裂韧性与应力诱导下可相变的四方相含量之间有线性关系。本文研究了ZrO2相变的热力学关系和四方ZrO2相变对断裂韧性所起作用的关系式,并以此对上述实验结果作了合理的讨论。本文的实验结果与理论分析可很好地相互映证。 相似文献
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