title: Sepiocite, sepiolite-like nanoclay derived from hydrotalcite-like layered double hydroxide.
abstract: 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.
authors: Center for Intelligent NanoBio Materials (CINBM), Department of Bioinspired Science, Ewha Womans University, Seoul 120-750, Korea.
authors: Dae-Hwan
authors: DH
authors: Park
authors: Myung Wook
authors: MW
authors: Jang
authors: Yong-Gun
authors: YG
authors: Shul
authors: Jin-Ho
authors: JH
authors: Choy
mesh_terms: D000536:Aluminum Hydroxide / Q000737:chemistry*; D001546:Bentonite; D006878:Hydroxides / Q000737:chemistry*; D008276:Magnesium Hydroxide / Q000737:chemistry*; D017633:Magnesium Silicates / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D010316:Particle Size; D033362:Powder Diffraction
chemical_list: D006878:Hydroxides; D017633:Magnesium Silicates; D001546:Bentonite; C010467:hydrotalcite; D000536:Aluminum Hydroxide; C001671:magnesium trisilicate; D008276:Magnesium Hydroxide