Structural Characterization and Delamination of Lactate-Intercalated Zn,Al-Layered Double Hydroxides

Abstract

Al molar ratios of 2:1, 3:1, and 4:1) and lactate (Lc) as counteranion were synthesized by coprecipitation using 0:1 and 3:1 lactic acid:Al molar ratios to prepare the starting solutions. Their physicochemical properties were studied by element chemical analysis, powder X-ray diffraction, infrared spectroscopy, and thermal analyses. Powder X-ray diffraction showed a pattern characteristic of a hydrotalcite-like structure. FT-IR spectroscopy confirmed the retention of the lactate anions in the interlayer without further contamination. Thermal analyses showed four stages of weight loss and five of heat change when recorded under oxidizing conditions. Dispersion of the dried samples in decarbonated water by ultrasound-assisted treatment at room temperature led to delamination of all wet fractions. Upon solvent evaporation, dried fractions restacked with a higher crystallinity and an increase in basal spacing.

Synthesis and characterisation of exfoliated layered double hydroxide (LDH) / sugar nanocomposites

“…The FTIR spectra are in good agreement with previous reports on LDHs ( Lee et al, 2005;Jauberite et al, 2006). The absorption bands below 1000 cm -1 are associated with M-O (Mg-O, Al-O) stretching modes in the brucite-like layer.…”

Study of structural transformations and phases formation upon calcination of Zn–Ni–Al hydrotalcite nanosheets

“…The increase of calcination temperature led to dramatic changes in the sample background spectrum (figure 3, spectrum c, d, e, f). The OH and CO 2− 3 vibration bands have drastically decreased in intensity, which was probably due to the removal of interlayer water and CO 2 (Jaubertie et al 2006). Figure 4 shows TEM images of as-synthesized Zn-Ni-Al hydrotalcite.…”

Structural characterization and related properties of the stearate anions intercalated Ni–Al hydrotalcite-like compound prepared by the microwave crystallization

“…The c parameter (namely three times the distance between the brucite-like layers) equals three times the value of d (003) or six times the value of d (006) if the peaks are sharp enough [42,43]. However, as the peaks are somewhat broad, the lattice parameter c can be calculated by averaging the (0 0 3) and (0 0 6) positions, according to the following equation [44][45][46][47]:…”