Publications de Jian Hao | EPFL Graph Search

Anisotropic node distortions in amorphous MOFs: Low-valent Zr sites as catalytic hotspots

Berend Smit, Wendy Lee Queen, Emad Oveisi, Kumar Varoon Agrawal, Jian Hao, Till Marian Schertenleib, Beatriz Bueno Mouriño, Timo Markus Oskar Felder, Vikram Vinayak Karve, Andres Adolfo Ortega Guerrero

We introduce a new approach to defect engineering in Zr-based metal-organic frameworks (Zr-MOFs), aiming to reduce Zr site valency while preserving high node connectivity. Using a rapid heat treatment (RHT) in humid air, oxygen vacancies (O-vacancies) were ...

Elsevier BV2025

Direct synthesis of nanocrystalline single-layer porous graphene for hydrogen sieving

Kumar Varoon Agrawal, Jian Hao, Luc Sébastien Bondaz

Porous single -layer graphene is promising as the selective layer for membrane-based gas separation thanks to the atomic thickness of the pore which can yield high permselective flux. Direct synthesis of porous graphene by chemical vapor deposition (CVD) i ...

Pergamon-Elsevier Science Ltd2024

Scalable Room-Temperature Synthesis of a Hydrogen-Sieving Zeolitic Membrane on a Polymeric Support

Kumar Varoon Agrawal, Jian Hao, Xuekui Duan, Mostapha Dakhchoune

Thescalable synthesis of high-temperature H-2-sieving membranesfor energy-efficient carbon capture can potentiallyenable the implementation of precombustion carbon capture at a rapidpace. ...

AMER CHEMICAL SOC2023

Unit-cell-thick zeolitic imidazolate framework films for membrane application

Kumar Varoon Agrawal, Heng-Yu Chi, Jian Hao, Shuqing Song, Luis Francisco Villalobos Vazquez de la Parra, Shaoxian Li, Qi Liu, Deepu Joseph Babu, Yu Han

Zeolitic imidazolate frameworks (ZIFs) are a subset of metal-organic frameworks with more than 200 characterized crystalline and amorphous networks made of divalent transition metal centres (for example, Zn2+ and Co2+) linked by imidazolate linkers. ZIF th ...

NATURE PORTFOLIO2023

Selective Photonic Gasification of Strained Oxygen Clusters on Graphene for Tuning Pore Size in the Å Regime

Oleg Yazyev, Kumar Varoon Agrawal, Jian Hao, Luc Sébastien Bondaz, Shaoxian Li, Kristians Cernevics

Controlling the size of single-digit pores, such as those in graphene, with an & Aring; resolution has been challenging due to the limited understanding of pore evolution at the atomic scale. The controlled oxidation of graphene has led to & Aring;-scale p ...

AMER CHEMICAL SOC2023

Mechanistic Study on Thermally Induced Lattice Stiffening of ZIF-8

Wendy Lee Queen, Kumar Varoon Agrawal, Pascal Alexander Schouwink, Jian Hao, Mehrdad Asgari, Deepu Joseph Babu, Qi Liu

The flexibility of the ZIF-8 aperture, which inhibits a molecular cutoff of 3.4 angstrom, can be reduced by rapid heat treatment to obtain CO2-selective membranes. However, the early stages of the structural, morphological, and chemical changes responsible ...

2021

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

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

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

Metal Soap Membranes for Gas Separation

Kumar Varoon Agrawal, Jian Hao, Davide Campi, Deepu Joseph Babu, Qi Liu

Metal soaps or metal alkanoates are metal-organic complexes held together with metal cations and the functional groups of hydrocarbon chains. They can be synthesized at a high yield by simply mixing the metal and organic sources, forming crystalline framew ...

2020