Synthesis of layered double hydroxide nanosheets by coprecipitation using a T-type microchannel reactor

Pang, Xiujiang; Sun, Mengxing; Ma, Xiuming; Hou, Wanguo

doi:10.1016/j.jssc.2013.11.013

Cited by 28 publications

(28 citation statements)

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“…MgAl-NO 3 LDH was synthesized by coprecipitation using a Ttype microreactor. 26 The concentration of mixed salt solution (Mg 2+ + Al 3+ ) was 0.3 mol L À1 and Mg/Al molar ratio was 2 by dissolving 0.750 g (2 Â 10 À3 mol) Al(NO 3 ) 3 $9H 2 O and 1.026 g (4 Â 10 À3 mol) Mg(NO 3 ) 2 $6H 2 O in 20 mL water. The alkali solution was diluted NH 3 $H 2 O solution ($7 wt%).…”

Section: Preparation Of Mgal Ldh Nanosheetsmentioning

confidence: 99%

“…More interestingly, the obtained LDH was consisted of 1-2 brucite-like layers. 26 This method is simple, environmentally friendly and can realize the large-scale preparation. Moreover, we also explored its further application in fabricating LDH-based materials, such as drug delivery 27,28 and hydrophobic protective coatings, 29 which exhibited its advantage of controllable surface modication.…”

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confidence: 99%

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Growth behavior of water dispersed MgAl layered double hydroxide nanosheets

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Section: Preparation Of Mgal Ldh Nanosheetsmentioning

confidence: 99%

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Growth behavior of water dispersed MgAl layered double hydroxide nanosheets

et al. 2017

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“…Plate-like particles of a similar size to those obtained in this work, approx. 20-30 nm, where obtained in another microreactor synthesis of hydrotalcites [13]. Microreactors do allow to obtain small particles with a narrow distribution of particle sizes.…”

Section: Comparison With Other Flow Synthesis Methodsmentioning

confidence: 99%

“…We hypothesised that achieving reproducible outcome in the co-precipitation step is critically important for attaining a narrow distribution of properties of the final LDHs in the two-step synthesis method. Although there are several reports of LDH synthesis under continuous flow conditions using micro-scale [11][12][13] and meso-scale reactors [14][15][16][17][18], there are no studies detailing systematic characterizations of morphological properties and thermal stability of the produced materials. In most of the earlier studies the produced materials are characterized by broad particle size distribution.…”

Section: Introductionmentioning

confidence: 99%

Continuous synthesis of doped layered double hydroxides in a meso-scale flow reactor

Yaseneva

Finn

et al. 2019

Chemical Engineering Journal

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Layered double hydroxides is a class of low cost structured nanomaterials with many potential applications in environmental catalysis and sustainable technologies. Their large scale use is hindered by the challenge of reproducible synthesis at scale. Here we report a general, readily scalable process for the reproducible synthesis of transition metal doped hydrotalcites using a two-step process: co-precipitation in a mm-scale (meso-scale) continuous flow reactor, followed by aging. We have shown that co-precipitation in flow at a residence time close to the micromixing time affords good control of particle formation. Reproducible synthesis allowed us, for the first time, to investigate the formation of the pore morphology of hydrotalcites and their thermal stability as a function of metal doping. The obtained samples exhibited surface areas (80-150 m 2 g-1) higher than those typically attained in batch syntheses, with very low standard deviation between the samples, a high degree of crystallinity and small crystallite sizes, in the range of 9.5-11.9 nm, depending on composition. A systematic characterization allowed us to elucidate the mechanism of the pore morphology formation: the crystallites were found to agglomerate into disk-like platelets, whereas the pore structure of the hydrotalcites is formed by agglomeration of the platelets.

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“…TEM image of a well-dispersed LDH prepared using microreactor under continuous process. Reproduced with permission from reference[92].…”

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Preparation of Layered Double Hydroxides toward Precisely Designed Hierarchical Organization

2019

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Layered double hydroxides (LDHs) are a class of materials with useful properties associated with their anion exchange abilities for a wide range of materials’ applications including adsorbent, catalyst and its support, ceramic precursor, and drug carrier. In order to satisfy the requirements for the detailed characterization and the practical application, the preparation of LDHs with varied composition and particle morphology has been examined extensively. The versatility of the preparation methods led LDHs with varied composition and micro/macroscopic morphology, which makes the application of LDHs more realistic. In the present review article, synthetic methods of LDHs are overviewed in order to highlight the present status of the LDHs for practical application.

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Synthesis of layered double hydroxide nanosheets by coprecipitation using a T-type microchannel reactor

Cited by 28 publications

References 47 publications

Growth behavior of water dispersed MgAl layered double hydroxide nanosheets

Growth behavior of water dispersed MgAl layered double hydroxide nanosheets

Continuous synthesis of doped layered double hydroxides in a meso-scale flow reactor

Preparation of Layered Double Hydroxides toward Precisely Designed Hierarchical Organization

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