Vitrification of extremely simple molecules by constrainment in nano-spaces; heat capacity and dielectric relaxation measurements

通过纳米空间的约束实现极其简单的分子的玻璃化；

• 批准号: 24740286
• 负责人: TATSUMI Soichi
• 金额: $ 2.91万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2012
• 资助国家: 日本
• 起止时间: 2012-04-01 至 2014-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-24740286/
• 关键词: 化学物理; ガラス転移; 誘電緩和; 液液転移; 過冷却液体; 単純系; 細孔凝縮法; 断熱型熱量計

The universality of supercooling liquid was examined by exploring the thermal property of the cyclohexane, carbon tetrachloride, and neopentane, such as having small inter-molecular interactions. Though, it is known that the glass transition temperature (Tg) of the ordinary liquid is in between 1/2 and 2/3 of each melting temperature, Tg of examined samples were all less than predicted temperature.The lowering of the Tg enabled these substances to reveal hump of heat capacities in the vicinity of 130 K, which might be related to the structuring of the liquid from high-temperature liquid phase to stable low-temperature liquid phase. In particular, cyclohexane showed 1st order phase transition at 154 K with sharp heat capacity jump and it became the first example to examine liquid-liquid transition by heat capacity measurements in a single molecular liquid.

通过对环己烷、四氯化碳和新戊烷分子间相互作用较小等热性质的研究，验证了过冷液的普适性。虽然已知普通液体的玻璃化转变温度(Tg)在每个熔化温度的1/2~2/3之间，但受检样品的玻璃化转变温度都低于预期温度，Tg的降低使这些物质在130K附近显示出热容的驼峰，这可能与液体从高温液态向稳定的低温液态结构有关。特别是，环己烷在154K时发生了一级相变，热容跃变剧烈，成为第一个用单分子液体的热容测量来研究液-液相变的例子。

项目成果

細孔中に閉じ込められたシクロヘキサンの新奇な相転移挙動

环己烷限制在孔隙中的新型相变行为

• 发表时间: 2013
• 作者: 辰巳創一;上原拓;小國正晴
• 通讯作者: 小國正晴

MCM-41細孔中の四塩化炭素のガラス転移

MCM-41孔中四氯化碳的玻璃化转变

• 发表时间: 2013
• 作者: 辰巳創一;小國正晴
• 通讯作者: 小國正晴

シリカ細孔内シクロヘキサンの液−液転移の発見

环己烷在二氧化硅孔隙中液-液转变的发现

• 发表时间: 2013
• 作者: 上原拓;辰巳創一;小國正晴;上原 拓，辰巳 創一，小國 正晴
• 通讯作者: 上原 拓，辰巳 創一，小國 正晴

Confinement enhanced phase transition of cyclohexane in measoporous silica

介孔二氧化硅中环己烷的约束增强相变

• 发表时间: 2013
• 作者: S. Tatsumi;T. Uehara;M. Oguni
• 通讯作者: M. Oguni

Thermodynamic study of simple molecular glasses: universal features in their heat capacity and the size of the cooperatively rearranging regions.

• DOI: 10.1103/physrevlett.109.045701
• 发表时间: 2012-07
• 期刊: Physical review letters
• 影响因子: 8.6
• 作者: S. Tatsumi;S. Aso;O. Yamamuro