title: Layered Double Hydroxide Nanoclusters: Aqueous, Concentrated, Stable, and Catalytically Active Colloids toward Green Chemistry.
abstract: Increasing attention has been dedicated to the development of nanomaterials rendering green and sustainable processes, which occur in benign aqueous reaction media. Herein, we demonstrate the synthesis of another family of green nanomaterials, layered double hydroxide (LDH) nanoclusters, which are concentrated (98.7 g/L in aqueous solvent), stably dispersed (transparent sol for >2 weeks), and catalytically active colloids of nano LDHs (isotropic shape with the size of 7.8 nm as determined by small-angle X-ray scattering). LDH nanoclusters are available as colloidal building blocks to give access to meso- and macroporous LDH materials. Proof-of-concept applications revealed that the LDH nanocluster works as a solid basic catalyst and is separable from solvents of catalytic reactions, confirming the nature of nanocatalysts. The present work closely investigates the unique physical and chemical features of this colloid, the formation mechanism, and the ability to act as basic nanocatalysts in benign aqueous reaction systems.
authors.affiliation: Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University , Sakai, Osaka 599-8531, Japan.
authors.forename: Yasuaki
authors.initials: Y
authors.lastname: Tokudome
authors.affiliation: Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University , Sakai, Osaka 599-8531, Japan.
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Morimoto
authors.affiliation: Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University , Sakai, Osaka 599-8531, Japan.
authors.forename: Naoki
authors.initials: N
authors.lastname: Tarutani
authors.affiliation: Centro de Química e Bioquímica, Departamento de Química e Bioquímica, Faculdade de Ciências da Universidade de Lisboa , Campo Grande, Ed. C8,1749-016 Lisboa, Portugal.|ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, United Kingdom.
authors.forename: Pedro D
authors.initials: PD
authors.lastname: Vaz
authors.affiliation: Centro de Química e Bioquímica, Departamento de Química e Bioquímica, Faculdade de Ciências da Universidade de Lisboa , Campo Grande, Ed. C8,1749-016 Lisboa, Portugal.
authors.forename: Carla D
authors.initials: CD
authors.lastname: Nunes
authors.affiliation: Université Clermont Auvergne Université Blaise Pascal , Institut de Chimie de Clermont-Ferrand, BP 10448, F-63000 Clermont-Ferrand, France.|CNRS, UMR 6296, ICCF, F-63171 Aubiere, France.
authors.forename: Vanessa
authors.initials: V
authors.lastname: Prevot
authors.affiliation: ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, United Kingdom.
authors.forename: Gavin B G
authors.initials: GB
authors.lastname: Stenning
authors.affiliation: Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University , Sakai, Osaka 599-8531, Japan.
authors.forename: Masahide
authors.initials: M
authors.lastname: Takahashi
keywords: aqueous synthesis; colloidal suspension; green chemistry; layered double hydroxides; nanocatalyst