Synthesis of hydrophobic MIL-53(Al) nanoparticles in low molecular weight alcohols: systematic investigation of solvent effects

Warfsmann, Jan; Tokay, Begüm; Champness, Neil R.

doi:10.1039/c8ce00913a

Cited by 32 publications

(18 citation statements)

References 65 publications

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“…The extensive mesoporosity and mechanical strength of Cladophora cellulose were expected to result in aerogels with low thermal conductivity and good mechanical properties (e.g., superelasticity, high compressive modulus), respectively [ 34 ]. Similarly, the thermal stability and hydrophobicity of Al-MIL-53 were expected to give the aerogels good fire retardancy and moisture resistance, respectively [ 40 – 42 ]. In addition, the easy synthesis of Al-MIL-53 and the abundance of CNFs offer advantages for large-scale preparation of the hybrid aerogels in a cost-effective manner.…”

Section: Resultsmentioning

confidence: 99%

Elastic Aerogels of Cellulose Nanofibers@Metal–Organic Frameworks for Thermal Insulation and Fire Retardancy

Zhou

Apostolopoulou‐Kalkavoura

Costa

et al. 2019

Nano-Micro Lett.

140

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HIGHLIGHTS • The study reveals the great potential of metal-organic framework (MOF)-based nanocomposites in thermal insulation and fire retardancy applications. • A nanoengineering approach was developed to process MOFs into freestanding, mechanically strong, and elastic aerogels, which may boost the fundamental research and practical applications of MOFs in these areas. ABSTRACT Metal-organic frameworks (MOFs) with high microporosity and relatively high thermal stability are potential thermal insulation and flame-retardant materials. However, the difficulties in processing and shaping MOFs have largely hampered their applications in these areas. This study outlines the fabrication of hybrid CNF@MOF aerogels by a stepwise assembly approach involving the coating and cross-linking of cellulose nanofibers (CNFs) with continuous nanolayers of MOFs. The cross-linking gives the aerogels high mechanical strength but superelasticity (80% maximum recoverable strain, high specific compression modulus of ~ 200 MPa cm 3 g −1 , and specific stress of ~ 100 MPa cm 3 g −1).

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Section: Resultsmentioning

confidence: 99%

Elastic Aerogels of Cellulose Nanofibers@Metal–Organic Frameworks for Thermal Insulation and Fire Retardancy

Zhou

Apostolopoulou‐Kalkavoura

Costa

et al. 2019

Nano-Micro Lett.

140

View full text Add to dashboard Cite

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“…Furthermore, the influence of the solvents is investigated for the model Knoevenagel reaction. As we all know, one of the fundamental challenges and ultimate goals for organic reactions is to perform the reaction under solvent‐free condition or in environmentally friendly solvents . H 2 O and ethanol are the two typical green polar protic solvents, which have high polarity.…”

Section: Resultsmentioning

confidence: 99%

Ultrasonication‐assisted Synthesis of α, β‐Unsaturated Compounds Catalyzed by Amino‐functionalized FDU‐12 Catalyst

Yang

Zhang

et al. 2019

ChemistrySelect

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Amino-group functionalized FDU-12 material (FDU-12-NH 2 ) was utilized as an efficient and recyclable catalyst for the Knoevenagel condensation to afford α, β-unsaturated compounds. The catalysts were characterized by nitrogen adsorption, X-ray diffraction, Fourier transform infrared spectrophotometer, scanning electron microscopy, transmission electron microscopy and thermogravimetric analysis, which showed that FDU-12-NH 2 was successfully prepared using the post-synthesis-grafting method. Compared with the magnetic stirring method, the ultrasound-assisted method could improve the Knoevenagel reaction significantly in this work. In addition, the catalyst exhibited the highest catalytic activity in the mixed solvent of ethanol and water with volume ratio of 3 : 1 due to the solvent effect. Various substrates could convert to their desired products with high yields in short time; what's more, it could be used for four times without significant decrease of the activity. This work reveals that FDU-12-NH 2 is a promising heterogeneous catalyst for the synthesis of α, β-unsaturated compounds.

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“…Developing green chemical methods is one of the most important purposes of organic synthesis at present. One of the fundamental challenges and ultimate goals for organic reactions is to perform the reaction under solvent‐free condition or in environmentally friendly solvents . Here, in order to investigate the influence of the solvents, the model reaction of benzaldehyde with malononitrile was carried out through magnetic stirring method in various solvents and also under solvent‐free condition at room temperature.…”

Section: Resultsmentioning

confidence: 99%

Sodium Tungstate Supported on a Three‐dimensional and Networked SBA‐15 for Knoevenagel Reaction

2019

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Sodium tungstate (ST) supported on a three-dimensional and networked SBA-15 (3D-SBA-15) was utilized as a novel efficient catalyst for the Knoevenagel condensation of aldehydes with active methylene compounds such as malononitrile and ethyl cyanoacetate to afford substituted olefins through the conventional magnetic stirring or under ultrasound irradiation. ST/3D-SBA-15 catalyst was prepared using an incipient wetness impregnation method and confirmed by series of characterizations such as Fourier-transform infrared spectra (FT-IR), scanning electron microscope (SEM), X-ray diffraction (XRD), N 2 adsorption-desorption and inductively coupled plasma-optical emission spectroscopy. The reaction proceeded smoothly under the both stirring and ultrasound-assisted conditions at room temperature. The 30ST/3D-SBA-15 catalyst with 30 wt% loading of Na 2 WO 4 showed the highest catalytic performance with excellent yield within short time, and improvements were observed by carrying out the reactions under ultrasound irradiation. In addition, the solvent effect was significant in this work, and the optimum solvent was ethanol and water with volume ratio of 1 : 1.

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Synthesis of hydrophobic MIL-53(Al) nanoparticles in low molecular weight alcohols: systematic investigation of solvent effects

Abstract: Employing methanol as a reaction solvent when preparing MIL-53(Al) leads to a highly porous MOF without the requirement of an energy-consuming activation process.

Cited by 32 publications

References 65 publications

Elastic Aerogels of Cellulose Nanofibers@Metal–Organic Frameworks for Thermal Insulation and Fire Retardancy

Elastic Aerogels of Cellulose Nanofibers@Metal–Organic Frameworks for Thermal Insulation and Fire Retardancy

Ultrasonication‐assisted Synthesis of α, β‐Unsaturated Compounds Catalyzed by Amino‐functionalized FDU‐12 Catalyst

Sodium Tungstate Supported on a Three‐dimensional and Networked SBA‐15 for Knoevenagel Reaction

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