Surface modification of layered double hydroxides and incorporation of hydrophobic organic compounds

A critical assessment of the methods for intercalating anionic surfactants in layered double hydroxides

“…A weak peak at 1637 cm -1 is assigned to the H 2 O bending vibration of interlayer water, while a strong peak at 1359 cm-1 is assigned to the vibration of the carbonate species (Bouranda et al, 2008). The characteristic vibration bands of the sulphonate group are 1186, 1130, 1039, 1011 and 832 cm -1 (Bouranda et al, 2008;Anbarasan et al, 2005;Wang et al, 2005). The above-mentioned bands are present in all LDH-DBS intercalates, whatever the preparation method used.…”

“…Generally, organic sulphate and sulphonate groups exhibit frequencies at 1200-1180 cm -1 (Clearfield et al, 1991; and 1420-1370 cm -1 (Bouranda et al, 2008;Anbarasan et al, 2005;Wang et al, 2005). The former band is evidently absent in the LDH-laurate spectrum.…”

“…In addition, the encapsulation of the drug within the interlayer isolates it from the immediate environment, and improves its long-term stability and storage. Pesticides and genes have been protected, carried and delivered by intercalated LDHs and the active compounds have been released controllably to target sites (Choy et al, 1999;Wang et al, 2005).…”

Hierarchical layered double hydroxide nanocomposites: structure, synthesis and applications

“…89,[104][105][106][107][108] Hydrophobic modification of LDH is applied in drug delivery of hydrophobic pesticides and dyes, 106,107 as well as in biofuel production. 105,108 It is worth noting that some of the organic modifiers are not only anchored on the surface of the LDH matrix, but also intercalated in the LDH gallery space, and the ionic affinity of the molecules may allow partial exchange of anions between LDH layers.…”

Hybrid Inorganic/Organic Composites of Layered Double Hydroxides Intercalated with Organic Acid Anions for the Uptake of Hazardous Substances from Aqueous Solution

“…DS•Mg-Al LDH with a Mg/Al molar ratio of 2 had the lowest sorption affinity, although it contained the highest amount of DS, and adsorption is thought to occur on edge/external surface area. Wang et al (2005) examined the surface modification of Mg-Al LDH and incorporation of hydrophobic organic compounds. Surface properties of Mg-Al LDHs intercalated with DS and dodecylbenzenesulfonate were modified from hydrophilic to hydrophobic.…”