Nanoplatelets of Sodium Hectorite Showing Aspect Ratios of ≈20000 and Superior Purity
Titelangaben
Stöter, Matthias ; Kunz, Daniel A. ; Schmidt, Marko ; Hirsemann, Dunja ; Kalo, Hussein ; Putz, Bernd ; Senker, Jürgen ; Breu, Josef: Nanoplatelets of Sodium Hectorite Showing Aspect Ratios of ≈20000 and Superior Purity. In: Langmuir.
Bd. 29
(Januar 2013)
Heft 4
.
- S. 1280-1285.
ISSN 1520-5827
DOI: https://doi.org/10.1021/la304453h
Abstract
Applying a combination of melt synthesis followed by long-term annealing a fluorohectorite is obtained which is unique in respect to homogeneity, purity and particle size. Counter intuitively, the hectorite undergoes a disorder to order transition upon swelling to the level of the bilayer hydrate. Alkylammonium exchanged samples show at any chain length only a single basal spacing corroborating a nicely homogenous layer charge density. Its intracrystalline reactivity improves greatly upon annealing making it capable to spontaneously and completely disintegrate into single clay lamellae of 1 nm. Realizing exceptional aspect ratios of around 20000 upon delamination, this synthetic clay will offer unprecedented potential as functional filler in highly transparent nanocomposites with superior gas barrier and mechanical properties.
auf ERef Bayreuth