| Titre : | Mg – al layered double hydroxides intercalated with polyetheramidoacids and exhibiting a pH - responsive releasing property (2012) |
| Auteurs : | Chih-Wei Chiu, Auteur ; Yi-Lin Liao, Auteur ; Jiang-Jen Lin, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Industrial & engineering chemistry research (Vol. 51 N° 1, Janvier 2012) |
| Article en page(s) : | pp. 581–586 |
| Note générale : | Chimie industrielle |
| Langues : | Anglais |
| Tags : | Hydroxides pH |
| Résumé : | Mg–Al layered double hydroxides (LDH) are prepared by coprecipitation of Mg(NO3)2 and Al(NO3)3 and subsequently incorporated with poly(oxypropylene)-bis-amidocarboxylic acid (POP). When characterized by X-ray diffraction, the interlayer spacing of the synthesized POP/LDH hybrids were found to be spatially expanded, with basal spacing ranging from 33–94 Å, proportionately correlated to the POP molecular weight of 400–4000 g/mol. With increasing POP molecular weight incorporation, a critical d-spacing is reached when the POP/LDH hybrids become hydrophobic. The organo-LDH units possessed an amphiphilic property and ability of dispersing in water, ethanol, and toluene. Furthermore, the hybrid was actually stable under basic conditions but structurally disintegrating at pH 2 through the release of POP organics into aqueous solution. The understanding of the mechanism involving basal spacing shrinkage and structure disintegration allows the future development of utilizing the POP-modified clay as pH-sensitive and self-destructive materials. |
| DEWEY : | 660 |
| ISSN : | 0888-5885 |
| En ligne : | http://pubs.acs.org/doi/abs/10.1021/ie201535n |
