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Title: Unusual hydrocarbon chain packing mode and modification of crystallite growth habit in the self-assembled nanocomposites zinc-aluminum-hydroxide oleate and elaidate (cis-and trans-[Zn2Al(OH)6(CH3(CH2)7CH=CH(CH2)7COO-)] and magnesium analogues.

We report a novel packing mode specific to the cis unsaturated hydrocarbon chain in the title compound, a self-assembled layered double hydroxide-surfactant hybrid nanomaterial, and its influence on crystallite morphology and structure. The kink imposed by the cis double bond in oleate leads to partial overlap between chains on adjacent layers, with incomplete space filling, in contrast to the more usual (and more efficient) mono- and bilayer packings exhibited by the trans analogues. Incorporation of surfactant into the growing crystallite leads to a reversal of the usual LDH growth habit and results in crystallite shapes featuring ribbonlike sheets. The thermal decomposition behavior of the as-prepared organic/inorganic nanocomposites in air and N{sub 2} is described.
Authors:
 [1] ;  [2] ;  [2] ; ;  [3] ;
  1. (Sandia National Laboratories, Carlsbad, NM)
  2. (University of North Texas, Denton, TX)
  3. (University of New Mexico, Albuquerque, NM)
Publication Date:
OSTI Identifier:
950685
Report Number(s):
SAND2004-2181J
TRN: US200910%%251
DOE Contract Number:
AC04-94AL85000
Resource Type:
Journal Article
Resource Relation:
Journal Name: Proposed for publication in Chemistry of Materials.
Research Org:
Sandia National Laboratories
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 77 NANOSCIENCE AND NANOTECHNOLOGY; ZINC COMPOUNDS; ALUMINIUM COMPOUNDS; MAGNESIUM COMPOUNDS; CRYSTAL STRUCTURE; ESTERS; ALUMINIUM HYDROXIDES; NANOSTRUCTURES; CRYSTAL GROWTH; PYROLYSIS; COMPOSITE MATERIALS