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Additive Induced Formation of Ultrathin Sodium Chloride Needle Crystals.
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2017-12-08 , DOI: 10.1021/acs.cgd.7b01170 Eleanor R Townsend 1 , Willem J P van Enckevort 1 , Paul Tinnemans 1 , Melian A R Blijlevens 1 , Jan A M Meijer 2 , Elias Vlieg 1
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2017-12-08 , DOI: 10.1021/acs.cgd.7b01170 Eleanor R Townsend 1 , Willem J P van Enckevort 1 , Paul Tinnemans 1 , Melian A R Blijlevens 1 , Jan A M Meijer 2 , Elias Vlieg 1
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A multitude of ultrathin crystal needles are formed during the evaporation of saturated aqueous NaCl solution droplets in the presence of amide containing additives. The needles are as small as 300 nm wide and 100-1000 μm in length. Heating experiments, X-ray diffraction, and energy dispersive X-ray spectroscopy showed that the needles are cubic sodium chloride crystals with the needle length direction pointing toward [100]. This shape, not expected for the 43̅m point group symmetry of NaCl, has been explained using a model, based on tip formation by initial morphological instability followed by time dependent adsorption of additive molecules blocking the growth of the needle side faces. The latter also suppresses side branch formation, which normally occurs for dendrite growth.
中文翻译：
超薄氯化钠针晶体的添加剂诱导形成。
在含有酰胺的添加剂存在下，在饱和氯化钠水溶液小滴蒸发过程中，形成了许多超薄晶体针。针头小至300 nm宽，长度为100-1000μm。加热实验，X射线衍射和能量色散X射线光谱显示，针头是立方氯化钠晶体，针头长度方向指向[100]。已经使用模型解释了这种形状，这对于NaCl的43μm点组对称性是无法预料的，该模型基于通过初始形态不稳定性，随时间而定的吸附性吸附添加剂分子（阻碍了针侧面的生长）而形成的针尖。后者还抑制了侧枝的形成，这通常发生在枝晶生长中。
更新日期：2018-01-08
中文翻译：
超薄氯化钠针晶体的添加剂诱导形成。
在含有酰胺的添加剂存在下，在饱和氯化钠水溶液小滴蒸发过程中，形成了许多超薄晶体针。针头小至300 nm宽，长度为100-1000μm。加热实验，X射线衍射和能量色散X射线光谱显示，针头是立方氯化钠晶体，针头长度方向指向[100]。已经使用模型解释了这种形状，这对于NaCl的43μm点组对称性是无法预料的，该模型基于通过初始形态不稳定性，随时间而定的吸附性吸附添加剂分子（阻碍了针侧面的生长）而形成的针尖。后者还抑制了侧枝的形成，这通常发生在枝晶生长中。
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