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X1213655221银虫 (初入文坛)
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| 由不同陈化时间所得碳酸钙的FESEM图(见图10)可以得到，当陈化时间为0 h(图10a)和陈化时间为0.5 h(图10c)，形成的碳酸钙形貌不规整，处于正在生长的状态。当陈化时间为1 h，就得到形貌规整，类球状的碳酸钙。随着陈化时间延长至6 h，类球状的球霰石开始溶解，表面变得不规整。陈化时间继续延长，溶解的类球状球霰石往立方体方解石方向结晶。陈化时间到12 h，体系中碳酸钙的晶型及形貌趋于稳定，陈化24h后球霰石仍高达86.2%。综上可得，随着陈化时间的延长，样品中球霰石的含量下降，部分球霰石溶解并转化为方解石。 |
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hookhans
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2楼2013-03-25 16:07:23
hookhans
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X1213655221: 金币+50, 翻译EPI+1, ★★★很有帮助 2013-03-26 09:31:28
X1213655221: 金币+50, 翻译EPI+1, ★★★很有帮助 2013-03-26 09:31:28
| The FSEM images of the calcium carbonate aged for different times are shown in (Fig 10. It can be seen that the calcium carbonate was still in the growth state with irregular morphologies when the aging time was 0 h (image 10a) and 0.5 h(image 10c). When the aging time is 1 h, spherical like calcium carbonate with regular morphology was obtained. With the increase of the aging time to 6 h, the spherical like vaterite became to dissolve and show irregular surface. Further increase the aging time would result in the crystallization of the dissolved vaterite to cubic calcite. When the aging time reached to 12 h, the morphology of the calcium carbonate tended to be stabilized, and the content of the vaterite could be as high as 86.2%. In summary, with the increase of the aging time, the content of the vaterite in the sample decreases, and part of the vaterite became to dissolve and transfer to calcite. |
3楼2013-03-25 16:09:22
