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X1213655221銀蟲 (初入文壇)
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[求助]
專業(yè)英語翻譯
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由圖2可知，樣品只有在712 cm-1和876 cm-1處有強吸收峰，這與方解石的特征峰位 (712 cm-1、876 cm-1)相吻合。通過圖3可知出現(xiàn)的特征衍射峰位置(2θ=23.0°、29.4°、39.4°、47.5°)，與標(biāo)準(zhǔn)PDF卡(卡號：05-0586)對照，分別歸屬方解石的(012)、(104)、(113)、(018)晶面，進一步證實產(chǎn)物為單一方解石，這與其FT-IR表征結(jié)果相吻合。從圖4可以看出在純水體系中CaCO3以規(guī)則的層狀結(jié)構(gòu)聚集在一起，呈立方體形狀，而且其粒徑邊長為3-6 μm，分布較為均勻。綜上表明：在純水體系中生成的碳酸鈣均為單一的方解石。 從圖5可見在712 cm-1、745 cm-1、和876 cm-1均有出峰，這與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。各條譜線峰的強度不同，可能是由于不同pH值條件下形成球霰石含量不同引起的。表明不同pH值體系下所得的碳酸鈣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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X1213655221
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3樓2013-03-25 16:49:22
hookhans
鐵桿木蟲 (著名寫手)
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【答案】應(yīng)助回帖
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愛與雨下: 金幣+1 2013-03-25 19:22:41
愛與雨下: 金幣+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樓2013-03-25 16:07:06
hookhans
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★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★
愛與雨下: 金幣+1 2013-03-25 19:22:52
X1213655221: 金幣+50, 翻譯EPI+1, ★★★很有幫助 2013-03-26 09:31:50
愛與雨下: 金幣+1 2013-03-25 19:22:52
X1213655221: 金幣+50, 翻譯EPI+1, ★★★很有幫助 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樓2013-03-25 17:59:34
hookhans
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5樓2013-03-25 21:49:25
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