对不同掺杂量的人工烟水晶 Y 棒和未掺杂水晶 Y 棒 c 面、±x 面作 HF 酸腐蚀,然后进行扫描电镜蚀象形貌观察。观察到 c 面腐蚀后出现的三方锥体和对应的蚀坑与水晶中三方偏方面体单形方位一致。±x 面蚀坑形貌特征进一步表明...对不同掺杂量的人工烟水晶 Y 棒和未掺杂水晶 Y 棒 c 面、±x 面作 HF 酸腐蚀,然后进行扫描电镜蚀象形貌观察。观察到 c 面腐蚀后出现的三方锥体和对应的蚀坑与水晶中三方偏方面体单形方位一致。±x 面蚀坑形貌特征进一步表明了该单形在烟水晶生长中的显露。指出了在±x 这两个面族上蚀坑形貌的方位与晶体内部结构中 Si—O_4四面体在 x 轴方向褶叠螺旋环的旋向一致,使晶体表面形貌与晶体内部结构由表及里有机地联系起来。展开更多
Plenty of flue gas desulfurization(FGD) gypsum generated from coal-fired power plants for sulfur dioxide sequestration caused many environmental issues. Preparing calcium sulfate whisker(CSW) from FGD gypsum by hydrot...Plenty of flue gas desulfurization(FGD) gypsum generated from coal-fired power plants for sulfur dioxide sequestration caused many environmental issues. Preparing calcium sulfate whisker(CSW) from FGD gypsum by hydrothermal synthesis is considered to be a promising approach to solve this troublesome problem and utilize calcium sulfate in a high-value-added way. The effects of particle size of FGD gypsum, slurry concentration,and additives on CSW were investigated in this work. The results indicated that fine particle size of FGD gypsum and moderately high slurry concentration were beneficial for crystal nucleation and growth. Three additives of magnesium chloride, citric acid, and sodium dodecyl benzene sulfonate(SDBS) were employed in this study. It was found that mean length and aspect ratio of CSW were both decreased by the usage of magnesium chloride,while a small quantity of citric acid or SDBS could improve the CSW morphology. When multi-additives of citric acid-SDBS were employed, the mean length and aspect ratio increased more than 20%. Moreover, surface morphology of CSW went better, and the particle size and crystal shape became more uniform.展开更多
文摘对不同掺杂量的人工烟水晶 Y 棒和未掺杂水晶 Y 棒 c 面、±x 面作 HF 酸腐蚀,然后进行扫描电镜蚀象形貌观察。观察到 c 面腐蚀后出现的三方锥体和对应的蚀坑与水晶中三方偏方面体单形方位一致。±x 面蚀坑形貌特征进一步表明了该单形在烟水晶生长中的显露。指出了在±x 这两个面族上蚀坑形貌的方位与晶体内部结构中 Si—O_4四面体在 x 轴方向褶叠螺旋环的旋向一致,使晶体表面形貌与晶体内部结构由表及里有机地联系起来。
基金Supported by National Science Foundation of China(51374059,51304042)the Fundamental Research Funds for the Central Universities of China(N130402020)
文摘Plenty of flue gas desulfurization(FGD) gypsum generated from coal-fired power plants for sulfur dioxide sequestration caused many environmental issues. Preparing calcium sulfate whisker(CSW) from FGD gypsum by hydrothermal synthesis is considered to be a promising approach to solve this troublesome problem and utilize calcium sulfate in a high-value-added way. The effects of particle size of FGD gypsum, slurry concentration,and additives on CSW were investigated in this work. The results indicated that fine particle size of FGD gypsum and moderately high slurry concentration were beneficial for crystal nucleation and growth. Three additives of magnesium chloride, citric acid, and sodium dodecyl benzene sulfonate(SDBS) were employed in this study. It was found that mean length and aspect ratio of CSW were both decreased by the usage of magnesium chloride,while a small quantity of citric acid or SDBS could improve the CSW morphology. When multi-additives of citric acid-SDBS were employed, the mean length and aspect ratio increased more than 20%. Moreover, surface morphology of CSW went better, and the particle size and crystal shape became more uniform.
