Kumar Varoon Agrawal

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Publications associées (72)

Synthesis of high-performance polycrystalline metal-organic framework membranes at room temperature in a few minutes

Deepu Joseph Babu, Kumar Varoon Agrawal, Heng-Yu Chi, Qi Liu, Jian Hao

The development of a rapid and reproducible crystallization route for the synthesis of polycrystalline metal-organic framework (MOF) films is attractive for the scalable production of nanoporous membranes on porous supports. Prior crystallization studies h ...

Royal Society of Chemistry2020

Gas-sieving zeolitic membranes fabricated by condensation of precursor nanosheets

Yu Han, Michele Ceriotti, Kumar Varoon Agrawal, Claudia Esther Avalos, Pascal Alexander Schouwink, Mostapha Dakhchoune, Luis Francisco Villalobos Vazquez de la Parra, Rocio Semino Barbaresi

The synthesis of molecular-sieving zeolitic membranes by the assembly of building blocks, avoiding the hydrothermal treatment, is highly desired to improve reproducibility and scalability. Here we report exfoliation of the sodalite precursor RUB-15 into cr ...

2020

Crystal Engineering of Metal-Organic Framework Thin Films for Gas Separations

Deepu Joseph Babu, Kumar Varoon Agrawal, Guangwei He, Luis Francisco Villalobos Vazquez de la Parra

Metal organic frameworks or MOFs have witnessed a phenomenal rise owing to a highly tunable synthetic chemistry allowing flexibility in the selection of its constituents, namely metal nodes and linkers. Combined with their superior adsorption and diffusion ...

AMER CHEMICAL SOC2019

High-permeance polymer-functionalized single-layer graphene membranes that surpass the postcombustion carbon capture target

Mounir Driss Mensi, Emad Oveisi, Kumar Varoon Agrawal, Shiqi Huang, Guangwei He, Jing Zhao, Luis Francisco Villalobos Vazquez de la Parra

Membrane-based postcombustion carbon capture can reduce the capture penalty in comparison to absorbent-based separation. To realize this, high-performance membranes are urgently needed with a CO2 permeance exceeding 1000 gas permeation units or GPU, and a ...

2019

Hydrogen sieving from intrinsic defects of benzene-derived single-layer graphene

Mina Moradi, Kumar Varoon Agrawal, Shiqi Huang, Mostapha Dakhchoune, Jing Zhao, Majharul Haque Khan

Single-layer graphene films, crystallized by chemical vapor deposition, host a low density of vacancy defects that are attractive for the size-sieving of molecules. The size and the density of such defects are a function of the growth temperature and the c ...

2019

Crystallization of gas-selective nanoporous graphene by competitive etching and growth: a modeling study

Kumar Varoon Agrawal, Soumajit Dutta

A robust synthesis methodology for crystallizing nanoporous single-layer graphene hosting a high density of size-selective nanopores is urgently needed to realize the true potential of two-dimensional membranes for gas separation. Currently, there are no c ...

Nature Research2019

Large-scale fabrication of flexible solid-state reference electrodes

Hubert Girault, Milica Jovic, Kumar Varoon Agrawal, Luis Francisco Villalobos Vazquez de la Parra

A new approach for large-scale fabrication of miniaturized, reliable and planar solid-state reference electrodes on flexible substrates is presented. Inkjet printing technique was used for the fabrication of conductive path and silver patterns that were ch ...

2019

Towards the Ultimate Membranes: Two-dimensional Nanoporous Materials and Films

Kumar Varoon Agrawal

2018

Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes

Deepu Joseph Babu, Kumar Varoon Agrawal, Guangwei He

We report the synthesis of thin, highly intergrown, polycrystalline metal-organic framework (MOF) membranes on a wide range of unmodified porous and non-porous supports (polymer, ceramic, metal, carbon, and graphene). We developed a novel crystallization t ...

JOURNAL OF VISUALIZED EXPERIMENTS2018

Electrophoretic Nuclei Assembly for Crystallization of High Performance Membranes on Unmodified Supports

Kumar Varoon Agrawal, Shiqi Huang, Guangwei He, Mostapha Dakhchoune, Jing Zhao

Metal-organic frameworks (MOFs) films have recently emerged as highly permselective membranes yielding orders of magnitude higher gas permeance than that from the conventional membranes. However, synthesis of highly-intergrown, ultrathin MOF films on porou ...

2018

Single-layer graphene membranes by crack-free transfer for gas mixture separation

Duncan Thomas Lindsay Alexander, Emad Oveisi, Andreas Züttel, Kumar Varoon Agrawal, Shiqi Huang, Guangwei He, Mostapha Dakhchoune, Wen Luo, Jing Zhao

The single-layer graphene film, when incorporated with molecular-sized pores, is predicted to be the ultimate membrane. However, the major bottlenecks have been the crack-free transfer of large-area graphene on a porous support, and the incorporation of mo ...

Nature Publishing Group2018

Ultrahigh flux gas-selective nanoporous carbon membrane and manufacturing method thereof

Nikunj Dudani, Kumar Varoon Agrawal, Shiqi Huang, Guangwei He, Mostapha Dakhchoune

The present relates to a nanoporous carbon membrane manufacturing method comprising coating a block copolymer film with hydrophilic and hydrophobic blocks, on a sacrificial non-porous substrate so as to prepare an block copolymer film coated foil, transfer ...

2018

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