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
Efficient approach for preparing gold nanoparticles in layered double hydroxide: synthesis, structure, and properties
TL;DR: A simple and efficient method of preparing gold nanoparticles (AuNPs) using the eco-compatible inorganic material layered double hydroxide (LDH) under mild conditions is reported in this paper.
Journal ArticleDOI
Short-time hydrothermal synthesis and delamination of ion exchangeable Mg/Ga layered double hydroxides
TL;DR: In this article, the synthesis of magnesium-gallium layered double hydroxides (Mg/Ga LDHs) was studied under static and agitated conditions, and the reaction time was comparatively decreased from 24 to 2h by means of agitation during hydrothermal synthesis.
Journal ArticleDOI
Allylbenzene isomerisation over as-synthesized MgAl and NiAl containing LDHs: Basicity-activity relationships
TL;DR: Aramendia et al. as discussed by the authors showed that MgAl4-HT and NiAl4−HT exhibited a maximum conversion of 99% and 95% respectively at 160°C using DMF as solvent in 6h.
Journal ArticleDOI
Intercalation of ethylene glycol into yttrium hydroxide layered materials.
Yuanzhou Xi,Robert J. Davis +1 more
TL;DR: Characterization of the material by FT-IR spectroscopy, thermogravimetric analysis, and the catalytic transesterification of tributyrin with methanol was consistent with direct bonding of ethylene glycolate anions to the yttrium hydroxide layers, forming Y-O-C bonds.
Journal ArticleDOI
Delaminated layered double hydroxides as catalysts for the Meerwein–Ponndorf–Verley reaction
TL;DR: In this paper, the authors used delamination and ion-exchange in combination to obtain delaminated solids from layered double hydroxides (LDHs) for the Meerwein-Ponndorf-Verley (MPV) reaction.
References
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