Calorimetric study on two biphenyl liquid crystals
文献类型：期刊论文
| 作者 | Zou, GL; Tan, ZC; Di, YY; Lan, XZ; Sun, LX; Zhang, T |
| 刊名 | thermochimica acta
 |
| 出版日期 | 2004-12-01 |
| 卷号 | 423期号:1-2页码:83-88 |
| 关键词 | adiabatic calorimetry heat capacity liquid crystal 3BmFF 3BmFFXF3 DSC phase transition |
| 产权排序 | 1;1 |
| 英文摘要 | the molar heat capacities of the two biphenyl liquid crystals, 3bmff and 3bmffxf3, with a purity of 99.7 mol% have been precisely measured by a fully automated precision adiabatic calorimeter in the temperature range between t = 80 and 350 k. nematic phase-liquid phase transitions were found between t = 297 k and 300 k with a peak temperature of t-peak = (298.071 +/- 0.089) k for 3bmff, and between t = 316 and 319 k with a peak temperature of t-peak = (315.543 +/- 0.043) k for 3bmffxf3. the molar enthalpy (delta(trs)h(m)) and entropy (delta(trs)s(m)) corresponding to these phase transitions have been determined by means of the analysis of the heat capacity curves, which are (15.261 +/- 0.023) u mol(-1) and (51.202 +/- 0.076) j k-1 mol(-1) for 3bmff, (31.624 +/- 0.066) kj mol(-1) and (100.249 +/- 0.212) j k-1 mol(-1) for 3bmffxf3, respectively. the real melting points (ti) and the ideal melting points (to) with no impurities of the two compounds have been obtained from the fractional melting method to be (298.056 +/- 0.018) k and (298.165 +/- 0.038) k for 3bmff, (315.585 +/- 0.043) k and (315.661 +/- 0.044) k for 3bmffxf3, respectively. in addition, the transitions of these two biphenyl liquid crystals from nematic phase to liquid phase have further been investigated by differential scanning calorimeter (dsc) technique; the repeatability and reliability for these phase transitions were verified. (c) 2004 elsevier b.v. all rights reserved. |
| WOS标题词 | science & technology ; physical sciences |
| 类目[WOS] | chemistry, analytical ; chemistry, physical |
| 研究领域[WOS] | chemistry |
| 关键词[WOS] | acid |
| 收录类别 | SCI |
| 原文出处 | true |
| 语种 | 英语 |
| WOS记录号 | WOS:000224511200011 |
| 公开日期 | 2010-11-30 |
| 源URL | [http://159.226.238.44/handle/321008/81441]  |
| 专题 | 大连化学物理研究所_中国科学院大连化学物理研究所 |
| 作者单位 | Chinese Acad Sci, Dalian Inst Chem Phys, Thermochem Lab, Dalian 116023, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zou, GL,Tan, ZC,Di, YY,et al. Calorimetric study on two biphenyl liquid crystals[J]. thermochimica acta,2004,423(1-2):83-88. |
| APA | Zou, GL,Tan, ZC,Di, YY,Lan, XZ,Sun, LX,&Zhang, T.(2004).Calorimetric study on two biphenyl liquid crystals.thermochimica acta,423(1-2),83-88. |
| MLA | Zou, GL,et al."Calorimetric study on two biphenyl liquid crystals".thermochimica acta 423.1-2(2004):83-88. |
入库方式： OAI收割
来源：大连化学物理研究所
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