Nonclassical Crystallization of Dipicolinic Acid in Microemulsions
Nonclassical Crystallization of Dipicolinic Acid in Microemulsions
复制标题
微乳液中吡啶二羧酸的非经典结晶
DOI：
10.1021/cg501147j
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发表时间：
2015
影响因子：
3.8
通讯作者：
Chen C
中科院分区：
文献类型：
--
作者：
Chen C
Dipicolinic acid (DPA) was crystallized in microemulsions to investigate the effect of three-dimensional nanoconfinement on the crystallization process. The microemulsions were acidified with 2 M HCl to prevent the formation of DPA metal salts, which occurs because of a pH shift toward neutrality arising from the nanoconfinement. Transmission electron microscopy (TEM) analysis showed that 30–100 nm square-plate nanoaggregates crystallized from these acidified microemulsions. Higher-resolution TEM images revealed that the nanoaggregates consisted of smaller 3–10 nm nanocrystals. The fast-Fourier transforms of images obtained from these nanocrystals were similar to the diffraction pattern arising from the whole nanoaggregate, confirming that the nanocrystals exhibited ordered packing and resembled mesocrystals. The crystallization of the nanoaggregates is aided by the suppression of Ostwald ripening of the nanocrystals in the nanometer-sized microemulsion droplets and adsorption of the surfactant onto the nanocrystals.
