Please use this identifier to cite or link to this item:
|標題:||Organo-clay hybrids based on dendritic molecules: preparation and characterization||作者:||Juang, T.Y.
|關鍵字:||layered silicate nanocomposites;double hydroxides;building-blocks;dendrimers;intercalation;montmorillonite;dendrons;behavior;macromolecules;nanoparticles||Project:||Nanotechnology||期刊/報告no：:||Nanotechnology, Volume 18, Issue 20.||摘要:||
Three generations of dendrons ( G1, G2 and G3) with phenyl end-groups were intercalated into montmorillonite ( MMT) layered silicates in dimethylformamide/water cosolvent. These dendrons synthesized via the convergent route were different in size and shape with molecular weights ranging from 930 to 5975 g mol(-1). X-ray diffraction ( XRD) and high resolution transmission electron microscopy ( HRTEM) indicate that the respective intercalations of MMT with G1, G2 and G3 dendrons exhibited organized characteristics, and the interlayer spacings were 38, 77 and 115 angstrom for G1/MMT, G2/MMT and G3/MMT, respectively. Furthermore, the modified dendron/ MMT hybrids could be well dispersed into organic solvents, such as DMF, due to the presence of hydrophobic dendritic molecules. Our results indicate that organic/inorganic hybrids resulting from the association of dendrons and inorganic layered silicate can be obtained not only by ionic exchange reaction, but possibly by a direct organized route as well. Moreover, the preparation of dendron/MMT hybrids was investigated at different dendron/MMT molar ratios regarding the changes of interlayer distance. When the molar ratio is within the range of 0.25-1.0 cationic exchange capacity ( CEC) equivalents, the d spacings increase from 19 to 38 angstrom for G1/MMT, 15 to 77 angstrom for G2/MMT and 14 to 115 angstrom for G3/MMT, revealing a conformation change of the intercalating dendrons.
|Appears in Collections:||材料科學與工程學系|
Show full item record
TAIR Related Article
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.