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介绍了聚氨酯塑胶跑道最新技术进展,对塑胶跑道的新型环保配方、低成本塑胶跑道、纳米改性塑胶跑道、晶须材料和EPDM材料等进行了综述. 相似文献
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氧化铝纳米阵列模板的制备和研究 总被引:2,自引:0,他引:2
分别以硫酸和磷酸为电解液,用阳极氧化法在不同工艺下,制备纯度为99.999%,不同晶粒组织的纯铝箔基体上的氧化铝纳米阵列模板,得到5种孔径的纳米孔:10nm,20nm,30nm,60nm,100nm;用透射电镜和X射线衍射进行表征和结构分析,观察到了:阻挡层、趋于六边形的单元结构薄层和不同孔径、密度的纳米孔阵列,其结构为无定形,对这种自组织结构作了初步的生长过程分析. 相似文献
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Enhanced photoluminescence (PL) at room temperature from thermally annealed a-Si:H/SiO2 multilayers is observed through the step-by-step thermal post-treatment. The correlation between the PL and the crystallization process is studied using temperature-dependent PL, Raman, cross section high-resolution transmission electron microscopy (XHRTEM) and x-ray diffraction (XRD) techniques. An intensified PL band around 820 nm is discovered from the sample annealed near the crystallization onset temperature, which is composed of two peaks centred at 773 nm and 863 nm, respectively. It is found that the PL band centred at 863 nm is related to the pseudo nanocrystal (p-nc-Si) silicon, and the PL band centred at 773 nm is attributed to Si = O bonds stabilized in the p-nc-Si surface. 相似文献
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In this paper, we establish a one-dimensional random nanocrystalline chain model, we derive a new formula of ac electron-phonon-field conductance for electron tunnelling transfer in one-dimensional nanometre systems. By calculating the ac conductivity, the relationship between the electric field, temperature and conductivity is analysed, and the effect of crystalline grain size and distortion of interfacial atoms on the ac conductance is discussed. A characteristic of negative differential dependence of resistance and temperature in the low-temperature region for a nanometre system is found. The ac conductivity increases linearly with rising frequency of the electric field, and it tends to increase as the crystalline grain size increases and to decrease as the distorted degree of interfacial atoms increases. 相似文献
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张茂润 《安徽理工大学学报(自然科学版)》2000,20(1):44-46,57
采用化学沉淀法制备了Fe3O4微粒,用溶剂置换等方法进行了干燥,获得了平均粒径Dv为50~70 nm,饱和磁化强度为(75~80)kA/m的超细Fe3O4粉体.考察了工艺条件和干燥条件对Fe3O4粉体性能的影响. 相似文献