Park Dae-Hwan, Jang Myung Wook, Shul Yong-Gun, Choy Jin-Ho
Center for Intelligent NanoBio Materials (CINBM), Department of Bioinspired Science, Ewha Womans University, Seoul 120-750, Korea.
J Nanosci Nanotechnol. 2011 Jan;11(1):382-5. doi: 10.1166/jnn.2011.3239.
Sepiocite, a synthetic sepiolite-like nanoclay, was derived from hydrotalcite-like Mg2Al(CO3)0.5-layered double hydroxide (LDH) under phase transformation at 270 +/- 3 degrees C. The crystal structure of sepiocite is conceptually very similar to that of sepiolite derived from montmorillonite clay because sepiocite is formed through the alternation of the blocks and tunnels along the crystallographic c-axis, with a partial dehydroxylation of the octahedral Mg-(OH)-Al configuration into tetrahedral ones. Three important findings regarding sepiocite were arrived at: (i) its high specific surface area of 128.25 m2/g with an average particle size of 200 nm, which is approimately equal to 3.5 times larger than the specific surface area of the pristine LDH (34.21 m2/g); (ii) its non-swelling property; and (iii) its strongly reduced anion-exchange capacity.
海泡石cite是一种合成的海泡石状纳米粘土，它是由类水滑石的Mg2Al(CO3)0.5层状双氢氧化物（LDH）在270±3℃的相变条件下衍生而来。海泡石cite的晶体结构在概念上与由蒙脱石粘土衍生的海泡石非常相似，因为海泡石cite是通过沿晶体学c轴的块体和通道交替形成的，八面体Mg-(OH)-Al构型部分脱羟基形成四面体构型。关于海泡石cite有三个重要发现：（i）其高比表面积为128.25 m2/g，平均粒径为200 nm，大约是原始LDH比表面积（34.21 m2/g）的3.5倍；（ii）其不膨胀特性；（iii）其显著降低的阴离子交换容量。
