Selective and controlled synthesis of α- and β-cobalt hydroxides in highly developed hexagonal platelets

Zhaoping Liu, Renzhi Ma, Minoru Osada, Kazunori Takada, Takayoshi Sasaki

Research output: Contribution to journalArticle

382 Citations (Scopus)

Abstract

We report on the controlled synthesis of single-crystal platelets of α- and β-Co(OH)2 via homogeneous precipitation using hexamethylenetetramine as a hydrolysis agent. The α- and β-Co(OH)2 hexagonal platelets of several micrometers in width and about 15 nm in thickness were reproducibly yielded in rather dilute CoCl2 solutions in the presence and absence of NaCl at 90 °C, respectively. The phase and size control of the products were achieved by varying both CoCl2 and NaCl concentrations. Polarized optical microscope observations revealed clear liquid crystallinity of colloidal suspensions of these high aspect-ratio platelets. The as-prepared α-Co(OH)2 containing interlayer chloride ions was intercalated with various inorganic or organic anions, keeping its high crystallinity and hexagonal platelike morphology.

Original languageEnglish
Pages (from-to)13869-13874
Number of pages6
JournalJournal of the American Chemical Society
Volume127
Issue number40
DOIs
Publication statusPublished - 2005 Oct 12
Externally publishedYes

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Platelets
Cobalt
Blood Platelets
Methenamine
Anions
Chlorides
Aspect ratio
Hydrolysis
Suspensions
Microscopes
Negative ions
Single crystals
Ions
Liquids
cobalt hydroxide

ASJC Scopus subject areas

  • Chemistry(all)

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Selective and controlled synthesis of α- and β-cobalt hydroxides in highly developed hexagonal platelets. / Liu, Zhaoping; Ma, Renzhi; Osada, Minoru; Takada, Kazunori; Sasaki, Takayoshi.

In: Journal of the American Chemical Society, Vol. 127, No. 40, 12.10.2005, p. 13869-13874.

Research output: Contribution to journalArticle

Liu, Zhaoping ; Ma, Renzhi ; Osada, Minoru ; Takada, Kazunori ; Sasaki, Takayoshi. / Selective and controlled synthesis of α- and β-cobalt hydroxides in highly developed hexagonal platelets. In: Journal of the American Chemical Society. 2005 ; Vol. 127, No. 40. pp. 13869-13874.
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