Sepiocite, sepiolite-like nanoclay derived from hydrotalcite-like layered double hydroxide

Dae Hwan Park, Myung Wook Jang, Yong Gun Shul, Jin Ho Choy

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


Sepiocite, a synthetic sepiolite-like nanoclay, was derived from hydrotalcite-like Mg 2Al(CO 3) 0.5-layered double hydroxide (LDH) under phase transformation at 270±3 °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 m 2/g with an average particle size of 200 nm, which is ≈3.5 times larger than the specific surface area of the pristine LDH (34.21 m 2/g); (ii) its non-swelling property; and (iii) its strongly reduced anion-exchange capacity. Copyright

Original languageEnglish
Pages (from-to)382-385
Number of pages4
JournalJournal of Nanoscience and Nanotechnology
Issue number1
Publication statusPublished - 2011 Jan

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics


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