Ordering and potential appearance of a phase transition in low-tenperature liquid confined within meso-pores

中孔内低温液体中相变的有序性和潜在出现

• 批准号: 25610119
• 负责人: OGUNI Masaharu
• 金额: $ 2.5万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Challenging Exploratory Research
• 财政年份: 2013
• 资助国家: 日本
• 起止时间: 2013-04-01 至 2014-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-25610119/
• 关键词: 液体; 相転移; 熱容量

Low-temperature thermal properties of liquid cyclohexane and benzene were studied by adiabatic calorimetry. Three features were found to be pointed out. The first is that the glass transition temperature and therefore the elementary process causing the transition reveal no big change with the pore diameter. The second is, the heat capacity curve displays a gentle peak and the peak temperature decreases with increasing the diameter, indicating that the peak in bulk liquid would appear below the glass transition temperature. This is understood as caused by the spatial restriction in the number of the permitted molecular configurations of the aggregates. The third is, in the case of cyclohexane, a phase transition appears in the pores with diameter around 2.1 nm. This implies that a special structure inherent to the liquid elementary one would be stabilized within the pores with including the inter-atomic interactions between the molecules and pore wall.

用绝热量热法研究了液体环己烷和苯的低温热性质。发现指出了三个特征。首先，玻璃化转变温度以及导致玻璃化转变的基本过程随孔径变化不大。第二，热容曲线呈现平缓的峰值，峰值温度随直径的增大而降低，表明大体积液体的热容峰值将出现在玻璃化转变温度以下。这被认为是由于聚集体允许的分子构型数量的空间限制造成的。在环己烷的情况下，直径在2.1 nm左右的孔内发生了相变。这意味着，液体基本体固有的特殊结构将通过包括分子与孔壁之间的原子间相互作用而稳定在孔内。

项目成果

シリカ細孔内シクロヘキサンの液~液相転移の発見

二氧化硅孔隙中环己烷液-液相变的发现

• 发表时间: 2013
• 作者: 上原拓;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