Synthesis of two-dimensional layered double hydroxides: a systematic overview

Chen, Zongkun; Fan, Qiqi; Huang, Minghua; Cölfen, Helmut

doi:10.1039/d2ce00511e

Cited by 16 publications

(6 citation statements)

References 139 publications

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“…[33] In an inert atmosphere, the oxidation reaction is attenuated, resulting in a purer LDH product. [34] Figure 4 shows the prepared LDH and their nanocomposites with different structures. [35]…”

Section: Ldh Preparationmentioning

confidence: 99%

“…Changes in the gas composition directly affect the degree of oxidation and the crystal structure of LDH, while the adjustment of the gas pressure affects the solubility of the gas in solution, and hence the growth rate and morphology of LDH crystals [33] . In an inert atmosphere, the oxidation reaction is attenuated, resulting in a purer LDH product [34] . Figure 4 shows the prepared LDH and their nanocomposites with different structures [35]…”

Section: Ldh Preparationmentioning

confidence: 99%

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Advances of Layered Double Hydroxide‐Based Materials for Tumor Imaging and Therapy

Ma,

Chen,

Qiao

2024

The Chemical Record

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Layered double hydroxides (LDH) are a class of functional anionic clays that typically consist of orthorhombic arrays of metal hydroxides with anions sandwiched between the layers. Due to their unique properties, including high chemical stability, good biocompatibility, controlled drug loading, and enhanced drug bioavailability, LDHs have many potential applications in the medical field. Especially in the fields of bioimaging and tumor therapy. This paper reviews the research progress of LDHs and their nanocomposites in the field of tumor imaging and therapy. First, the structure and advantages of LDH are discussed. Then, several commonly used methods for the preparation of LDH are presented, including co‐precipitation, hydrothermal and ion exchange methods. Subsequently, recent advances in layered hydroxides and their nanocomposites for cancer imaging and therapy are highlighted. Finally, based on current research, we summaries the prospects and challenges of layered hydroxides and nanocomposites for cancer diagnosis and therapy.

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Section: Ldh Preparationmentioning

confidence: 99%

Section: Ldh Preparationmentioning

confidence: 99%

Advances of Layered Double Hydroxide‐Based Materials for Tumor Imaging and Therapy

Ma,

Chen,

Qiao

2024

The Chemical Record

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“…Chen et al 115 provided a systematic review of the synthesis methods of 2D LDH materials, focusing on the characteristics possessed by different synthesis methods. A comprehensive review of the properties and synthesis methods of LDHs, carbon nanomaterials and composite nanomaterials is presented by Khorshidi et al 116 Kim et al 117 reviewed the standard synthesis methods for LDHs, analyzed the design and improvement of typical exemplary LDHs and LDH composites, and focused on the performance of LDH-based sensors for key biomarkers and contaminants, including glucose and metal ions.…”

Section: Introductionmentioning

confidence: 99%

Progress of layered double hydroxide-based materials for supercapacitors

Ren

Sridhar³

et al. 2023

Mater. Chem. Front.

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“…Attempts to upscale the production of LDHs included incrementing the concentration of the reactants [ 38 – 39 ], the use of large-scale reactors [ 40 – 41 ], byway co-precipitation, and mechanochemical approaches [ 27 ]. Although these methods can produce materials on a large scale, they are very limited in providing materials with controlled morphology, size, or crystallinity [ 42 ]. This issue can be partially solved using continuous flow techniques [ 43 – 44 ].…”

Section: Introductionmentioning

confidence: 99%

Upscaling the urea method synthesis of CoAl layered double hydroxides

Jaramillo-Hernández,

Oestreicher,

Mizrahi

et al. 2023

Beilstein J. Nanotechnol.

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Research on two-dimensional materials is one of the most relevant fields in materials science. Layered double hydroxides (LDHs), a versatile class of anionic clays, exhibit great potential in photocatalysis, energy storage and conversion, and environmental applications. However, its implementation in real-life devices requires the development of efficient and reproducible large-scale synthesis processes. Unfortunately, reliable methods that allow for the production of large quantities of two-dimensional LDHs with well-defined morphologies and high crystallinity are very scarce. In this work, we carry out a scale-up of the urea-based CoAl-LDH synthesis method. We thoroughly study the effects of the mass scale-up (25-fold: up to 375 mM) and the volumetric scale-up (20-fold: up to 2 L). For this, we use a combination of several structural (XRD, TGA, and N2 and CO2 isotherms), microscopic (SEM, TEM, and AFM), magnetic (SQUID), and spectroscopic techniques (ATR-FTIR, UV–vis, XPS, ICP-MS, and XANES-EXAFS). In the case of the volumetric scale-up, a reduction of 45% in the lateral dimensions of the crystals (from 3.7 to 2.0 µm) is observed as the reaction volume increases. This fact is related to modified heating processes affecting the alkalinization rates and, concomitantly, the precipitation, even under recrystallization at high temperatures. In contrast, for the tenfold mass scale-up, similar morphological features were observed and assigned to changes in nucleation and growth. However, at higher concentrations, simonkolleite-like Co-based layered hydroxide impurities are formed, indicating a phase competition during the precipitation related to the thermodynamic stability of the growing phases. Overall, this work demonstrates that it is possible to upscale the synthesis of high-quality hexagonal CoAl-LDH in a reproducible manner. It highlights the most critical synthesis aspects that must be controlled and provides various fingerprints to trace the quality of these materials. These results will contribute to bringing the use of these 2D layered materials closer to reality in different applications of interest.

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Synthesis of two-dimensional layered double hydroxides: a systematic overview

Abstract: Two-dimensional (2D) layered double hydroxides (LDH) are classic materials in fundamental research and practical application. 2D LDH have unique structural features, such as high aspect ratio, high specific surface area,...

Cited by 16 publications

References 139 publications

Advances of Layered Double Hydroxide‐Based Materials for Tumor Imaging and Therapy

Advances of Layered Double Hydroxide‐Based Materials for Tumor Imaging and Therapy

Progress of layered double hydroxide-based materials for supercapacitors

Upscaling the urea method synthesis of CoAl layered double hydroxides

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