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Instruments / Technical Area	Publication Details	Published	Actions
B07-C-Versatile Soft X-ray beamline: Ambient Pressure XPS and NEXAFS	Formation mechanism and porosity development in porous boron nitride Anouk L'Hermitte , Daniel M. Dawson , Pilar Ferrer , Kanak Roy , Georg Held , Tian Tian , Sharon E. Ashbrook , Camille Petit The Journal Of Physical Chemistry C 24 DOI: 10.1021/acs.jpcc.1c08565 Diamond Proposal Number(s): [26588] Show Abstract ▼ Abstract: Porous boron nitride (BN) has proven promising as a novel class of inorganic materials in the field of separations and particularly adsorption. Owing to its high surface area and thermal stability, porous BN has been researched for CO2 capture and water cleaning, for instance. However, research remains at the laboratory scale due to a lack of understanding of the formation mechanism of porous BN, which is largely a “black box” and prevents scale up. Partial reaction pathways have been unveiled, but they omit critical steps in the formation, including the porosity development, which is key to adsorption. To unlock the potential of porous BN at a larger scale, we have investigated its formation from the perspective of both chemical formation and porosity development. We have characterized reaction intermediates obtained at different temperatures with a range of analytical and spectroscopic tools. Using these analyses, we propose a mechanism highlighting the key stages of BN formation, including intermediates and gaseous species formed in the process. We identified the crucial formation of nonporous carbon nitride to form porous BN with release of porogens, such as CO2. This work paves the way for the use of porous BN at an industrial level for gas and liquid separations.	Dec 2021
I11-High Resolution Powder Diffraction	Role of crystal size on swing-effect and adsorption induced structure transition of ZIF-8 Tian Tian , Michael Wharmby , José B. Parra , Conchi O. Ania , David Fairen-jimenez Dalton Transactions DOI: 10.1039/C6DT00565A Diamond Proposal Number(s): [9750] Show Abstract ▼ Abstract: The flexibility and structure transition behaviour of ZIF-8 in a series of samples with different particle size has been studied using a combination of high-resolution N2 gas adsorption isotherms and, for the first time, a broad in situ PXRD and Rietveld analysis. During the stepped adsorption process, large particles showed a narrow adsorption/desorption pressure range with a shorter equilibrium time due to lower kinetic hindrance, deriving from higher amount of active sites. In situ PXRD showed that both the rotation of imidazole ring and a bend in the methyl group led to the gate opening of ZIF-8	Feb 2016

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