Delamination of Layered Double Hydroxide in Ionic Liquids under Ambient Conditions

Abstract

Liquid phase delamination of layered materials into single-or few-layer nanosheets leads to stable nanoscale dispersions of 2D materials. The delamination of layered double hydroxide (LDH) to double hydroxide nanosheets was studied in two ionic liquids (ILs): ethylammonium nitrate (EAN) and 1-butyl-3-methylimidazolium thiocyanate (BMIMSCN). The as-prepared lamellar structure of LDH disappeared upon dispersing it in ILs due to delamination into 2D nanosheets confirmed by X-ray scattering and diffraction techniques and further evaluated by height profile assessment of the nanoparticles by atomic force microscopy. The results showed that both the thickness and lateral size of the dispersed particles decreased in the IL-based samples, indicating that cleavage of the LDH materials can be observed in addition to delamination. The findings prove the concept of delamination of layered materials by ILs under ambient conditions�an excellent way to prepare 2D double hydroxide nanosheet dispersions in one step using nonvolatile green solvents.

Efficient Dispersion of Organic Fluorophores by Size Matching with a Difunctionalized Spacer Interleaved into Layered Double Hydroxide

“…However, these surfactants suffer from relatively low thermal stability, which leads to their degradation and to subsequent delamination of the LDH layers at high temperatures. While many applications are based on this delamination, ,, in the field of intercalation of dyes in LDH, this phenomenon must be absolutely avoided in order to guarantee confinement of the molecules and avoid their migration and mutual aggregation. Thermally resistant spacers are able to prevent such potential delamination and are therefore of great interest in addressing this issue.…”

Efficient dispersion of organic fluorophores by size matching with a new di-functionalized spacer interleaved into layered double hydoxide

“…However, these surfactants suffer from a relatively low thermal stability, which leads to their degradation and to the subsequent delamination of the LDH layers at high temperatures. While many applications are based on this delamination [40,52,53], in the field of the intercalation of dyes in LDH this phenomenon must be absolutely avoided in order to guarantee the confinement of the molecules and avoid their migration and mutual aggregation. Thermally resistant spacers are able to prevent such potential delamination and are therefore of great interest in addressing this issue.…”