Synthesis of β-SiC/SiO2 core-shell nanowires with the assistance of cerium oxide

The β-SiC/SiO2 core-shell nanowires with the "stem-and-node" structure were synthesized in the presence of cerium oxide by the carbothermal reduction of the starch-SiO2 hybrids gel.The samples were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),high-resolution transmission electron microscopy(HRTEM) and energy-dispersed X-ray(EDX).The results showed that the nanowires consisted of a 20-35 nm diameter crystalline β-SiC core wrapped with a 2-5 n...     

污染底泥处理及资源化利用研究进展

水体底泥污染是世界范围内的一个主要环境问题,底泥污染治理是城市河道水体污染综合治理的主要内容.文章分析了底泥中的主要污染物,阐述了原位、异位等无害化处理技术,同时考虑到底泥富含有用成分,对国内外各种底泥资源化利用途径进行探讨和总结.     

浅谈建筑析霜

本文简要分析了建筑析霜的产生原因，并结合笔者的实际工作经验提出了相应的防治措施。     

动态真空条件下快速合成β-SiC的研究

以淀粉(经85℃糊化)为碳源,正硅酸乙酯(TEOS)为硅源,通过溶胶-凝胶法制备了淀粉-SiO2混合凝胶,将混合干凝胶在动态真空条件下进行碳热还原制备碳化硅(SiC).用TGA、XRD、SEM及N2低温物理吸附等手段对淀粉-SiO2混合凝胶和碳热还原产物进行表征.结果表明,在950℃动态真空条件下即可合成出晶粒尺寸约为50nm,结晶度较高的β-SiC.