Morphological Investigation of Hybrid Langmuir−Blodgett Films of Arachidic Acid with a Hydrotalcite/Dendrimer Nanocomposite

Abstract

A hydrotalcite clay/dendrimer nanocomposite prepared by the ionic exchange process was adsorbed from suspension of the nanocomposite on a Langmuir monolayer of arachidic acid at the air/water interface, followed by compressing and transferring onto an arachidic acid monolayer Langmuir-Blodgett (LB) film on mica. For comparison, the hydrotalcite-adsorbed hybrid film was also prepared. The morphology of hydrotalcite and the nanocomposite studied by transmission electron microscopy indicated the layered structures with respectively 1.2 +/- 0.3 and 3.2 +/- 0.5 nm repeating distances. The hybrid Langmuir films displayed the occupied surface area of 0.24 nm2 for both hydrotalcite and the nanocomposite. The formation of hybrid Langmuir films was confirmed by Brewster angle microscopy. Atomic force microscopic images of hybrid LB films revealed the formation of plateau domains with the height difference of 6 nm for hydrotalcite and 12 nm for the nanocomposite and the presence of dendrimers adsorbed on the clay surface of the nanocomposite.

Synergistic stabilization of shale by a mixture of polyamidoamine dendrimers modified bentonite with various generations in water-based drilling fluid

“…Thus a highly flattened conformation in the interlayer space was formed. Similar phenomenon was also found by previous investigations (Costa and Imae, 2004;Reis et al, 2010;Decker et al, 2011;Larraza et al, 2011;Zhu et al, 2011). In the case of G5, because of hard and less flexible structure, it was difficult to be intercalated into the interlayer space due to the steric hindrance (Niu et al, 2011).…”

Hierarchical structures of dendritic polymers

“…This hybridization results in an increase of the interlayer spacing and flattening of the intercalated dendrimer molecules. The flattening of the dendrimer is also found for LB films of this hybrid 69, 70…”

Dendrimers and hyper-branched polymers interacting with clays: fruitful associations for functional materials

“…31 These nanocomposites were then adsorbed on a Langmuir monolayer of arachidic acid at the air/water interface. 32 In a related example, the PAMAM dendrimers were used to protect silver nanoparticles, and this assembly was interacted with hydrotalcite. XRD data indicated the diffusion of the dendrimer-protected Ag nanoparticles into the hydrotalcite structure.…”