版塊導航: 正在加載中...

登錄注冊

應《網絡安全法》要求，自2017年10月1日起，未進行實名認證將不得使用互聯網跟帖服務。為保障您的帳號能夠正常使用，請盡快對帳號進行手機號驗證，感謝您的理解與支持！

24小時熱門版塊排行榜

返回列表

本帖產生 1 個翻譯EPI ，點擊這里進行查看

yhc0316

銀蟲 (初入文壇)

應助: 0 (幼兒園)
金幣: 513.5
帖子: 28
在線: 6.8小時
蟲號: 2725822
注冊: 2013-10-15
專業(yè): 有機分析

[求助] 求幫忙翻譯，謝謝！！

X-ray diffraction and DSC analysis
To gain an insight into the PFC behaviour of FLA-Cn solids, powder wide-angle X-ray diffraction (PXD) and differential scanning calorimetry (DSC) experiments were conducted on the ground and pristine solids. The PXD patterns of pristine FLA-C3 and FLA-C5 solids show sharp and intense reflections, indicative of their well-ordered microcrystalline structures (Fig. 6a). In contrast, the ground samples display broad and featureless diffractograms reflecting notable amorphous features. This
indicates that grinding has induced the phase transition of FLACn solids between crystalline and amorphous states, which should be responsible for the PFC behaviour of FLA-Cn solids. The formation of amorphous state upon grinding was also confirmed by DSC experiments. As shown in Fig. 6b, no additional thermal transitions could be detected for all pristine solids before the isotropic melt transition (Tm); however, there is clearly one exothermic transition peak at the lower-temperature region for ground FLA-C3 and FLA-C5 solids. This broad exothermic peak (Tc) is ascribed to the cold-crystallization of amorphized FLA-Cn solids upon heating. Amorphized FLA-C3 and FLA-C5 solids have high Tc values, which result in their stable PFC behaviour at room temperature. It is known that the Tc is obviously lower than the Tm of a compound, and the ground FLA-C12 solid could cold-crystallize at or below room temperature since its isotropic melt point is only about 65 C. Thus, the amorphized FLA-C12 solid induced by grinding is in a thermodynamically and dynamically unstable morphology. This is reason why ground FLA-C12 solid exhibits spontaneously recovering fluorescence properties at room temperature.

回復此樓

» 猜你喜歡

本人考085602 化學工程專碩已經有23人回復
求調劑院校信息已經有4人回復
085600材料與化工306 已經有4人回復
286求調劑已經有10人回復
328求調劑，英語六級551，有科研經歷已經有9人回復
一志愿北京化工大學070300 學碩336求調劑已經有4人回復
286分人工智能專業(yè)請求調劑愿意跨考！已經有8人回復
資源與環(huán)境調劑申請(333分) 已經有5人回復
280求調劑已經有12人回復
269專碩求調劑已經有5人回復

1樓 2014-10-21 09:42:56

已閱回復此樓關注TA 給TA發(fā)消息送TA紅花 TA的回帖

ssssllllnnnn

至尊木蟲 (知名作家)

Translator and Proofreader

翻譯EPI: 1690
應助: 452 (碩士)
金幣: 31580.9
紅花: 100
帖子: 7681
在線: 19966.6小時
蟲號: 3328089
注冊: 2014-07-17
專業(yè): 腫瘤發(fā)生

【答案】應助回帖

★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★
真強必勝: 金幣+2, 謝謝 2014-10-21 14:26:10
yhc0316: 金幣+40, 翻譯EPI+1 2014-10-21 18:22:14

X射線衍射和DSC分析
為深入了解FLA-Cn固體的PFC性能，用粉末廣角X射線衍射（PXD）和差示掃描量熱（DSC）對研磨和原始固體進行了實驗。FLA-C3和FLA-C5固體的PXD圖譜呈尖銳和強烈的反射，表明他們?yōu)橹刃蚓坏奈⒕ЫY構（圖6a）。與此相反，研磨樣品呈寬和無特征的衍射圖譜，顯示其非晶狀態(tài)特征。這表明研磨引起了FLACn固體晶態(tài)和非晶態(tài)之間轉換，這應該是FLA-Cn固體PFC性能的原因。研磨時引起非晶狀態(tài)形成也由DSC實驗證實。如圖6b所示，原始固體在等向性熔體轉變（Tm）前沒有熱轉變; 而研磨FLA-C3和FLA-C5固體在較低溫度區(qū)域有一清楚的放熱轉變峰。這種廣泛的放熱峰（TC）是由于非晶FLA-Cn固體在加熱時發(fā)生的冷結晶所致。非晶化FLA-C3和FLA-C5固體具有高Tc值，導致其在室溫下具有穩(wěn)定的PFC性能�；衔锏腡c值明顯低于Tm值，研磨FLA-C12固體在室溫或低于室溫時可冷結晶，因為它的等向性熔點約僅為65℃。因此，研磨誘導的FLA-C12固體非晶化在熱力學和動態(tài)學上是一種不穩(wěn)定形態(tài)。這就是為什么研磨FLA-C12固體在室溫下具有自發(fā)恢復熒光的性能。

贊一下

回復此樓

2樓2014-10-21 10:50:21

已閱回復此樓關注TA 給TA發(fā)消息送TA紅花 TA的回帖

相關版塊跳轉我要訂閱樓主 yhc0316 的主題更新