玻璃形成剂乙醇在介孔硅中的多晶型
Polymorphism of the glass former ethanol confined in mesoporous silicon
摘要：
限制在平行排列的通道中的乙醇的X射线衍射图案约为。10 nm直径和50微米长度的中孔硅已被记录为填充分数，温度和不同的冷却和加热速率的函数。的吸附等温线，记录在液体状态下，表明三个单层厚，强烈吸附的壁层和毛细孔中心的分子冷凝馏分。虽然强烈吸附的膜保持在一个非晶态的整个温度范围内的调查，毛细管凝聚的分子再现散装固体乙醇的多态性，即形成结晶或玻璃状的状态作为冷却速率的函数。然而，在中孔中实现玻璃化所需的临界速率比本体状态小至少两个数量级。这一发现可以追溯到纯粹的几何约束和淬火无序效应，限制在介孔硅的特点。
英文摘要：
X-ray diffraction patterns of ethanol confined in parallel-aligned channels of approx. 10 nm diameter and 50 micrometer length in mesoporous silicon have been recorded as a function of filling fraction, temperature and for varying cooling and heating rates. A sorption isotherm, recorded in the liquid state, indicates a three monolayer thick, strongly adsorbed wall layer and a capillary condensed fraction of molecules in the pore center. Though the strongly adsorbed film remains in an amorphous state for the entire temperature range investigated, the capillary condensed molecules reproduce the polymorphism of bulk solid ethanol, that is the formation of either crystalline or glass-like states as a function of cooling rate. The critical rate necessary to achieve a vitrification in the mesopores is, however, at least two orders of magnitude smaller than in the bulk state. This finding can be traced both to pure geometrical constraints and quenched disorder effects, characteristic of confinement in mesoporous silicon.
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