Synthesis, anion exchange, and delamination of Co-Al layered double hydroxide: Assembly of the exfoliated nanosheet/polyanion composite films and magneto-optical studies

Zhaoping Liu, Renzhi Ma, Minoru Osada, Nobuo Iyi, Yasuo Ebina, Kazunori Takada, Takayoshi Sasaki

Research output: Contribution to journalArticle

901 Citations (Scopus)

Abstract

This paper describes a systematic study on the synthesis, anion exchange, and delamination of Co-Al layered double hydroxide (LDH), with the aim of achieving fabrication and clarifying the properties of LDH nanosheet/polyanion composite films. Co-Al-CO3 LDH hexagonal platelets of 4 μm in lateral size were synthesized by the urea method under optimized reaction conditions. The as-prepared CO3 2--LDH was converted to Cl-LDH by treating with a NaCl-HCl mixed solution, retaining its high crystallinity and hexagonal platelike morphology. LDHs intercalated with a variety of anions (such as NO3 -, ClO4 -, acetate, lactate, dodecyl sulfate, and oleate) were further prepared from Cl--LDH via an anion-exchange process employing corresponding salts. Exchanged products in various anion forms were found to show different delamination behaviors in formamide. Among them, best results were observed for NO3 --LDH in terms of the exfoliating degree and the quality of the exfoliated nanosheets. The delamination gave a pink transparent suspension containing well-defined nanosheets with lateral sizes of up to 2 μm. The resulting nanosheets were assembled layer-by-layer with an anionic polymer, poly(sodium styrene 4-sulfonate) (PSS), onto quartz glass substrates to produce composite films. Magnetic circular dichroism (MCD) measurements revealed that the assembled multilayer films exhibited an interesting magneto-optical response.

Original languageEnglish
Pages (from-to)4872-4880
Number of pages9
JournalJournal of the American Chemical Society
Volume128
Issue number14
DOIs
Publication statusPublished - 2006 Apr 12
Externally publishedYes

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Nanosheets
Composite films
Delamination
Anions
Ion exchange
Negative ions
Multilayer films
Dichroism
Platelets
Urea
Quartz
Styrene
Sodium
Salts
Fabrication
Glass
Circular Dichroism
hydroxide ion
polyanions
Polymers

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Synthesis, anion exchange, and delamination of Co-Al layered double hydroxide : Assembly of the exfoliated nanosheet/polyanion composite films and magneto-optical studies. / Liu, Zhaoping; Ma, Renzhi; Osada, Minoru; Iyi, Nobuo; Ebina, Yasuo; Takada, Kazunori; Sasaki, Takayoshi.

In: Journal of the American Chemical Society, Vol. 128, No. 14, 12.04.2006, p. 4872-4880.

Research output: Contribution to journalArticle

Liu, Zhaoping ; Ma, Renzhi ; Osada, Minoru ; Iyi, Nobuo ; Ebina, Yasuo ; Takada, Kazunori ; Sasaki, Takayoshi. / Synthesis, anion exchange, and delamination of Co-Al layered double hydroxide : Assembly of the exfoliated nanosheet/polyanion composite films and magneto-optical studies. In: Journal of the American Chemical Society. 2006 ; Vol. 128, No. 14. pp. 4872-4880.
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abstract = "This paper describes a systematic study on the synthesis, anion exchange, and delamination of Co-Al layered double hydroxide (LDH), with the aim of achieving fabrication and clarifying the properties of LDH nanosheet/polyanion composite films. Co-Al-CO3 LDH hexagonal platelets of 4 μm in lateral size were synthesized by the urea method under optimized reaction conditions. The as-prepared CO3 2--LDH was converted to Cl-LDH by treating with a NaCl-HCl mixed solution, retaining its high crystallinity and hexagonal platelike morphology. LDHs intercalated with a variety of anions (such as NO3 -, ClO4 -, acetate, lactate, dodecyl sulfate, and oleate) were further prepared from Cl--LDH via an anion-exchange process employing corresponding salts. Exchanged products in various anion forms were found to show different delamination behaviors in formamide. Among them, best results were observed for NO3 --LDH in terms of the exfoliating degree and the quality of the exfoliated nanosheets. The delamination gave a pink transparent suspension containing well-defined nanosheets with lateral sizes of up to 2 μm. The resulting nanosheets were assembled layer-by-layer with an anionic polymer, poly(sodium styrene 4-sulfonate) (PSS), onto quartz glass substrates to produce composite films. Magnetic circular dichroism (MCD) measurements revealed that the assembled multilayer films exhibited an interesting magneto-optical response.",
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