title: Synthesis mechanism study of layered double hydroxides based on nanoseparation.
abstract: Colloidal layered double hydroxides (LDH) nanosheets were sorted by their lateral sizes using a density gradient ultracentrifuge separation technique. Composition investigations on these size-sorted nanosheets indicated that larger sheets had higher Mg:Al ratio than the smaller ones. Experiments using different Mg:Al feed ratios confirmed that high Mg:Al ratio induced fast sheet growth speed. Tracking the source of the Mg:Al spatial distribution difference in one batch of synthesis at the nucleation process revealed the coprecipitation-redissolution of Mg(2+). Thus the discriminative separation of these nanosheets led to a new insight into the structure-composition relationship of LDH nanomaterials and more understanding on their formation mechanism.
authors.affiliation: State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
authors.forename: Zheng
authors.initials: Z
authors.lastname: Chang
authors.forename: Caiying
authors.initials: C
authors.lastname: Wu
authors.forename: Sha
authors.initials: S
authors.lastname: Song
authors.forename: Yun
authors.initials: Y
authors.lastname: Kuang
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Lei
authors.forename: Liren
authors.initials: L
authors.lastname: Wang
authors.forename: Xiaoming
authors.initials: X
authors.lastname: Sun