Preparation of a well-ordered layered nanocomposite from zinc–aluminum–chloride layered double hydroxide and hydrogenophosphate by ion exchange

LDHs Instability in Esterification Reactions and Their Conversion to Catalytically Active Layered Carboxylates

“…ratio found in the layered structure. For instance, LDHs containing chloride ions presented a basal distance of 7.7 Å , which is similar to the distance reported for other LDH systems containing chloride [16]. Also, the basal distance did not change with changes in the Zn/Al ratio, indicating that chloride ions are the only species responsible to keep the layers separated from each other.…”

Study on the release behavior and mechanism by monitoring the morphology changes of the large-sized drug-LDH nanohybrids

“…The XRD patterns of residual solids ( Figure 6a) show that all the (003) peaks move to higher 2h angle compared with the pristine intercalates (Figure 1a). The d 003 of 0.83 nm for three MA-IBU-H-i-R samples and 0.88 nm for MA-IBU-C-R are observed probably owing to the fewer numbers of accessible sites around the edge of the larger intercalates and therefore needing more negatively HPO 2À 4 than the smaller one, [29][30][31] confirming the intercalation of phosphate anions in the interlayer region during the release process combining with FTIR data (Figure 6b). From Figures 6a, b, it can be found that there are a few residual IBU anions within the interlayer regions (Figure 6a inset), consistent with the incomplete drug release of the hybrids at equilibrium ( Table 1).…”

Direct Control of Drug Release Behavior from Layered Double Hydroxides through Particle Interactions

“…The complete release of Ibp from all the samples is evidenced from the absence of characteristic absorption peaks for Ibp anion. The absorption band at around 1080 cm −1 is due to the stretching vibration of phosphate anion 46. The SEM images shown in Figure 9 indicate that in overall, more fractions of smaller aggregates are present in samples after release study, which could be due to the partial breakdown of aggregates by stirring during the release test.…”