期刊
CRYSTAL GROWTH & DESIGN
卷 16, 期 9, 页码 5403-5411出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.cgd.6b00894
关键词
-
资金
- UK Engineering and Physical Sciences (EPSRC) [EP/H005374/1]
- EPSRC [EP/N002423/1]
- Engineering and Physical Sciences Research Council [EP/N002423/1, EP/H005374/1, 1506180, EP/K039202/1] Funding Source: researchfish
- EPSRC [EP/H005374/1, EP/K039202/1, EP/N002423/1] Funding Source: UKRI
Many crystallization processes of great significance in nature and technology occur in small volumes rather than in bulk solution. This article describes an investigation into the effects of nanoscale confinement on the crystallization of the inorganic compound potassium ferrocyanide, K4Fe(CN)(6) (KFC). Selected for study due to its high solubility, rich polymorphism, and interesting physical properties,K4Fe(CN)(6) was precipitated within controlled pore glasses (CPG) with pore diameters of 8, 48, and 362 nm. Remarkable effects were seen, such that although anhydrous potassium ferrocyanide was never observed on precipitation in bulk aqueous solution, it was the first phase to crystallize within the CPGs and was present for at least 1 day in all three pore sizes. Slow transformation to the metastable tetragonal polymorph of the trihydrate K4Fe(CN)(6)center dot 3H(2)O (KFCT) then occurred, where this polymorph was stable for a month in 8 nm pores. Finally, conversion to the thermodynamically stable monoclinic polymorph of KFCT was observed, where this phase was always found after a few minutes in bulk solution. As far as we are aware these retardation effects by up to S orders of magnitude in the 8 nm pores are far greater than any seen previously in inorganic systems and provide strong evidence for the universal effects of confinement on crystallization.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据