Journal ArticleDOI
Synthesis, anion exchange, and delamination of Co-Al layered double hydroxide: assembly of the exfoliated nanosheet/polyanion composite films and magneto-optical studies.
TLDR
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.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 mum 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 microm. 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.read more
Citations
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Journal ArticleDOI
Effect of carbon entrapped in Co–Al double oxides on structural restacking and electrochemical performances
Ling-Hao Su,Xiaogang Zhang +1 more
TL;DR: In this paper, the effect of carbon, created during pyrolysis of benzoate and inserted in resulting double oxides, on structural reconstruction was investigated by X-ray diffraction, scanning electron microscope, Raman spectroscopy, and IR techniques.
Journal ArticleDOI
Tunable Exfoliation of Synthetic Clays
TL;DR: The large hydration enthalpy of inorganic interlayer cations sandwiched between moderately negatively charged silicate layers endows to smectites (e.g., hectorite) remarkably rich intracrystalline reactivity compared with most other layered materials as discussed by the authors.
Journal ArticleDOI
Interplay between chemical composition and cation ordering in the magnetism of Ni/Fe layered double hydroxides.
TL;DR: The synthesis of a family of ferrimagnetic NiFe layered double hydroxides with a variable Ni(2+)/Fe(3+) in-plane composition ofLDHs clarifies the origin of the glassy behavior, also reported for other magnetic LDHs, and points out spin frustration as the most likely cause.
Journal ArticleDOI
Facile synthesis of CoAl-LDH/MnO2 hierarchical nanocomposites for high-performance supercapacitors
TL;DR: In this paper, a simple redox reaction between Co 2+ species and MnO 4 − 4 was performed to construct CoAl-LDH/MnO 2 nanocomposites.
Journal ArticleDOI
Preparation of Layered Double Hydroxides toward Precisely Designed Hierarchical Organization
TL;DR: In order to satisfy the requirements for the detailed characterization and the practical application, the preparation of layered double hydroxides (LDHs) with varied composition and particle morphology has been examined extensively.
References
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