论文标题
单个冰晶生长在定向冷冻期间具有控制方向
Single ice crystal growth with controlled orientation during directional freezing
论文作者
论文摘要
冰的生长因其制造层次多孔微结构的能力而引起了极大的关注。然而，由于在原位观测过程中对冰梯度的控制有限，因此需要重新考虑冻结过程中倾斜的层状微结构的形成，这可以极大地丰富我们对多孔生物材料的建筑控制的洞察力。本文提供了对固体/液体界面形态的原位研究，其定向固化的单晶冰的c轴（光轴）垂直于聚梯度和偶然的（乙烯基醇，PVA）溶液中的c轴（光轴）。首次清楚地观察到雾化的形态和V形层状形态。层状冰冰血小板的层状间距，倾斜角度和尖端过冷的定量表征可对聚合物水性系统中固有的冰生长习惯进行更清晰的见解，并建议对多孔生物材料的未来设计和优化产生重大影响。
Ice growth has attracted great attention for its capability of fabricating hierarchically porous microstructure. However, the formation of tilted lamellar microstructure during freezing needs to be reconsidered due to the limited control of ice orientation with respect to thermal gradient during in-situ observations, which can greatly enrich our insight into architectural control of porous biomaterials. This paper provides an in-situ study of solid/liquid interface morphology evolution of directionally solidified single crystal ice with its C-axis (optical axis) perpendicular to directions of both thermal gradient and incident light in poly (vinyl alcohol, PVA) solutions. Misty morphology and V-shaped lamellar morphology were clearly observed in-situ for the first time. Quantitative characterizations on lamellar spacing, tilt angle and tip undercooling of lamellar ice platelets provide a clearer insight into the inherent ice growth habit in polymeric aqueous systems and are suggested exert significant impact on future design and optimization in porous biomaterials.
