title: Controlled synthesis and investigation of the mechanism of formation of hollow hemispherical protrusions on laurate anion-intercalated Zn/Al layered double hydroxide hybrid films.
abstract: Films of laurate (La) anion-intercalated zinc-aluminum layered double hydroxides (ZnAl-La-LDHs) with hollow hemispherical protrusions on the surface of the hybrid film have been conveniently prepared by an ion-exchange reaction of a nitrate-containing LDH film previously grown in situ on a porous anodic alumina/aluminum (PAO/Al) substrate. No template is required to form the hemispherical protrusions, thus avoiding a complicated template removal process. The dimensions, morphology, and resistance to bursting of the hollow hemispherical protrusions can be easily tuned by varying the experimental conditions such as sodium laurate concentration, reaction time, and reaction temperature. The evolution of the hollow protrusions was investigated by scanning electron microscopy (SEM), and a "bubble template-reconfiguration assembly" mechanism, in which air bubbles on the film surface act as a template, has been proposed to explain their formation. When the ion-exchange reaction was carried out on a film that had been treated by ultrasound to eliminate surface air bubbles, no hemispherical protrusions were formed, which is consistent with the proposed mechanism.
authors: State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
authors: Caili
authors: C
authors: Yue
authors: Hongyun
authors: H
authors: Chen
authors: Sailong
authors: S
authors: Xu
authors: Fazhi
authors: F
authors: Zhang
mesh_terms: D000536:Aluminum Hydroxide / Q000737:chemistry*; D006878:Hydroxides / Q000737:chemistry*; D007848:Laurates / Q000737:chemistry*; D008567:Membranes, Artificial; D008855:Microscopy, Electron, Scanning / Q000379:methods; D016062:Porosity; D017967:Zinc Compounds / Q000737:chemistry*
chemical_list: D006878:Hydroxides; D007848:Laurates; D008567:Membranes, Artificial; D017967:Zinc Compounds; D000536:Aluminum Hydroxide; C052745:zinc hydroxide