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X1213655221银虫 (初入文坛)
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由图2可知，样品只有在712 cm-1和876 cm-1处有强吸收峰，这与方解石的特征峰位 (712 cm-1、876 cm-1)相吻合。通过图3可知出现的特征衍射峰位置(2θ=23.0°、29.4°、39.4°、47.5°)，与标准PDF卡(卡号：05-0586)对照，分别归属方解石的(012)、(104)、(113)、(018)晶面，进一步证实产物为单一方解石，这与其FT-IR表征结果相吻合。从图4可以看出在纯水体系中CaCO3以规则的层状结构聚集在一起，呈立方体形状，而且其粒径边长为3-6 μm，分布较为均匀。综上表明：在纯水体系中生成的碳酸钙均为单一的方解石。 从图5可见在712 cm-1、745 cm-1、和876 cm-1均有出峰，这与方解石特征衍射峰和球霰石特征衍射峰 (745 cm-1、876 cm-1)相吻合。各条谱线峰的强度不同，可能是由于不同pH值条件下形成球霰石含量不同引起的。表明不同pH值体系下所得的碳酸钙含有方解石和球霰石晶型，且球霰石的含量可能不同。 |
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hookhans
铁杆木虫 (著名写手)
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5楼2013-03-25 21:49:25
hookhans
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爱与雨下: 金币+1 2013-03-25 19:22:41
爱与雨下: 金币+1 2013-03-25 19:22:41
| 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. |
2楼2013-03-25 16:07:06
X1213655221
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3楼2013-03-25 16:49:22
hookhans
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★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★
爱与雨下: 金币+1 2013-03-25 19:22:52
X1213655221: 金币+50, 翻译EPI+1, ★★★很有帮助 2013-03-26 09:31:50
爱与雨下: 金币+1 2013-03-25 19:22:52
X1213655221: 金币+50, 翻译EPI+1, ★★★很有帮助 2013-03-26 09:31:50
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ref. only. As shown in Fig. 2, the sample shows strong absorption peaks only at 712 cm- and 876 cm-1, which is in accordance with the characteristic peaks of calcite ((712 cm-1 and 876 cm-1). Comparison with the PDF standard card (card number: 05-0586) indicates that the diffraction peaks appeared in Fig. 3 (2θ=23.0°、29.4°、39.4°、47.5°) can be assigned to (012), (104), (113) and (018) facet of the calcite. This further demonstrates the product is pure calcite, consistent with the results of the FTIR. Fig. 4 shows that CaCO3 agglomerates in regular layer structure in pure water system, homogeneously distributed as cubic shape with grain size of ca. 3-6 nm. In summary, calcium carbonate forms pure calcite in pure water system. Fig. 5 shows peaks at 712 cm-1, 745 cm-1, and 876 cm-1, which is consistent with the absorption peaks of calcite and vaterite ((745 cm-1、876 cm-1). The intensity difference of these peaks might be due to the content of the vaterite synthesized at different pH conditions. This demonstrates that the calcium carbonate synthesized at different pH conditions has both calcite and vaterite crystal forms , but the content of the latter might be different. |
4楼2013-03-25 17:59:34