Recent advances in the synthesis of layered double hydroxides nanosheets

Abstract

Layered double hydroxide (LDH) with characteristic two-dimensional structure and positive layer charge has attracted attention in a wide range of applications in recent years. Although LDH with a layer-by-layer structure has high applicability as a catalyst, adsorbent, drug reservoir, and so on, it has been suggested that the single-layered LDH nanosheets not only enhance the performance but also expand the application in electrocatalyst, batteries, and supercapacitors due to the increased active sites in nanosheets. In this review, we introduced state of the art in the synthesis of LDH nanosheets in terms of synthesis approaches, mechanisms, and properties of thus obtained LDH nanosheets. The synthesis approaches are primarily categorized into two parts, namely, top-down synthesis to delaminate bulk LDH and bottom-up synthesis to obtain single-layer LDH in limited space. In the first section, the exfoliation of LDH, which was realized by weakening the layer-by-layer stacking and by increasing the basal distance, was summarized mainly based on the swelling mechanism. In the second section, the bottom-up syntheses of LDH nanosheets through controlled crystal growth in confined space or restricted synthetic conditions are introduced.

Blood Compatibility of Drug–Inorganic Hybrid in Human Blood: Red Blood Cell Hitchhiking and Soft Protein Corona

“…The zeta potential of MTX-LDH in a neutral aqueous condition was −17.0 ± 0.4 mV (Figure 5a), while LDH without the MTX moiety had a positive value of 31.4 ± 0.6 mV (Figure S5). The surface charge of LDH is known to be positive due to the substitution of Al 3+ for Mg 2+ in the layer [67][68][69]. The negative zeta potential of MTX-LDH was accountable for the surface adsorption of negatively charged MTX moieties.…”

MOF-Mediated Construction of NiCoMn-LDH Nanoflakes Assembled Co(OH)F Nanorods for Improved Supercapacitive Performance

“…As a typical pseudocapacitive material, transition metal hydroxides (TMHs) have become a popular electrode material in pursuing high supercapacitive performance due to their high redox activity, adjustable composition, low cost, and environmental friendliness [12]. However, TMHs have poor conductivity and stability as well as a severe aggregation tendency [13][14][15], resulting in a more unsatisfying capacitive performance than expected. In recent years, many efforts such as morphological engineering, elemental doping, heterojunction assembly, and similar approaches have been made in realizing the potential of TMHs [16][17][18].…”

Mixed Matrix Organo-Silica-Hydrotalcite Membrane for CO₂ Separation. Part 1: Synthesis and Analytical Description

“…The preferred approach involves converting them into a delaminated state, which offers an enlarged surface area for more effective interactions [ 11 ]. Delaminated HTlcs have a broad range of applications including their use as catalysts [ 12 ], enhanced drug delivery [ 13 ], biosensors, and adsorbents [ 14 ]. Its use as a pure material membrane has not shown convincing results due to the resulting porosity that facilitates only Knudsen diffusion [ 15 , 16 ].…”