Role of crystal nucleation and growth conditions on the soft-templated preparation of HKUST-1 MOFs with hierarchical porosity involving gemini surfactants

Ghosh, Rajesh; Sunny, Blesson; Babu, M. Sudheer; Thirumurugan, A.

doi:10.1016/j.micromeso.2022.111758

Cited by 4 publications

(3 citation statements)

References 37 publications

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“…58 Soft templates, which include block copolymers, flexible organic compounds and surfactants, function as structure-directing agents. 59,60 The soft template method results in micelles with diverse morphologies depending on the concentration of soft templates. The micelle structures enable inorganic materials to exhibit distribution trends driven by van der Waals forces, hydrogen bonds and electrostatic interactions between surfactant molecules and nanomaterials.…”

Section: Preparation Of Mnomentioning

confidence: 99%

Advances in the application of manganese dioxide and its composites for theranostics

Hao

Zhao

et al. 2023

Inorg. Chem. Front.

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Section: Preparation Of Mnomentioning

confidence: 99%

Advances in the application of manganese dioxide and its composites for theranostics

Hao

Zhao

et al. 2023

Inorg. Chem. Front.

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“…Our interest lies in the exploration of gemini surfactants, a unique class of dicationic surfactants as soft templates in the synthesis of HP MOFs. 43,44 In this work, we have used G 14−6−14 , a gemini surfactant, with hydrophilic quaternary ammonium-based dual-head groups, each containing a 14-C alkyl chain as the hydrophobic tail and a 6-C alkyl chain as the linker between the two-head groups (Figure S1 in the Supporting Information). We used the mixed solvent system containing water and ethanol to prepare UiO-66(NH 2 )-based HP-MOFs under both surfactant-assisted and surfactant-free synthetic conditions.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Among them, there exist few examples, where the soft templates based on amphiphilic, lengthy surfactants and block copolymers that are stabilized in various forms of meso-aggregates, that have been used as porogens to introduce mesopores in UiO-MOF family with varying levels of pore characteristics and hierarchical porosity. − (Table S2). Our interest lies in the exploration of gemini surfactants, a unique class of dicationic surfactants as soft templates in the synthesis of HP MOFs. , In this work, we have used G 14–6–14 , a gemini surfactant, with hydrophilic quaternary ammonium-based dual-head groups, each containing a 14-C alkyl chain as the hydrophobic tail and a 6-C alkyl chain as the linker between the two-head groups (Figure S1 in the Supporting Information). We used the mixed solvent system containing water and ethanol to prepare UiO-66(NH 2 )-based HP-MOFs under both surfactant-assisted and surfactant-free synthetic conditions.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Catalytic Activity through the Variation of Hierarchical Porosity in a Zr-Based Metal–Organic Framework

Sunny,

Alagarsamy

2024

Chem. Mater.

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Herein, we present a study that demonstrates variation of the hierarchical porosity (HP) of metal−organic frameworks (MOFs) obtained by changes in the synthetic conditions, has significant effects on the accessibility of bulkier molecules toward the active sites in the HP MOFs and helps in overcoming the mass-transfer limitation. Two materials of UiO-66-NH 2 , HP-MOF-1 and HP-MOF-3, with narrow size distribution of mesopores around 5 nm and with higher relative meso-to microporous volumes have been obtained by surfactant-assisted synthesis using the gemini surfactant, G 14−6−14 , in water−ethanol mixed solvent compositions. A different pattern of HP has been observed for HP-MOF-2 and HP-MOF-4, with much broader mesoporous size distributions in the 10 to 25 nm range and lower relative meso-to microporous volumes that are obtained from similar but in the surfactant-/template-free synthetic conditions. Involvement of both the lamellar and vesicular mixed assembly of G 14−6−14 as a mesoporous template is demonstrated in the formation of HP-MOF-1 and HP-MOF-3. The broader pore-size distributions and higher external surface areas found in our HP-MOF-2 and HP-MOF-4, are attributed to the intercrystallite voids, which occur due to the aggregation of MOF nanoparticles in the template-free conditions. Dye-uptake studies in our MOF samples, involving bulky molecules of different shapes, sizes and charges, provided useful insights into the active-site accessibility and also about the mode of uptake. The HP-MOF-1 and HP-MOF-3 achieve faster kinetics and higher catalytic conversions of bulky fatty acids into corresponding methyl esters (biodiesels) compared to HP-MOF-2 and HP-MOF-4 and their microporous counterpart on account of the increased accessibility to the active sites and better mass transfer kinetics in the hierarchically connected micropores and mesopores.

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Application ofMOFs on Removal of Emerging Water Contaminants

Viet,

Ha,

Tri

2023

Metal Organic Frameworks for Wastewater Contaminant Removal

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Role of crystal nucleation and growth conditions on the soft-templated preparation of HKUST-1 MOFs with hierarchical porosity involving gemini surfactants

Cited by 4 publications

References 37 publications

Advances in the application of manganese dioxide and its composites for theranostics

Advances in the application of manganese dioxide and its composites for theranostics

Enhanced Catalytic Activity through the Variation of Hierarchical Porosity in a Zr-Based Metal–Organic Framework

Application ofMOFs on Removal of Emerging Water Contaminants

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