A high pressure cell for supercritical CO2 on-line chemical reactions studied with x-ray techniques

[en] A versatile high pressure X-ray sample cell has been developed for conducting in situ time-resolved X-ray scattering experiments in the pressure and temperature regime required (pressures up to 210 bars and temperatures up to 120 °C) for chemical reactions in supercritical fluids. The large exit opening angle of the cell allows simultaneous performance of SAXS-WAXS experiments. Diamond windows are used in order to benefit from the combination of maximum strength, minimal X-ray absorption and chemical inertia. The sample cell can also be utilised for X-ray spectroscopy experiments over a wide range of photon energies. Results of the online synthesis of a block copolymer, poly(methyl methacrylate-block-poly(benzyl methacrylate), by Reversible Addition-Fragmentation Chain Transfer (RAFT) in a supercritical CO2 dispersion polymerisation will be discussed. The contribution of the density fluctuations, as function of temperature, to the X-ray scattering signal has been quantified in order to allow appropriate background subtractions

Disciplines :

Physics

Author, co-author :

Hermida-Merino, Daniel

Portale, Giuseppe

Fields, Peter

Wilson, Richard

Basset, Simon

Jennings, James

Dellar, Martin

Gommes, Cédric ; Université de Liège - ULiège > Département de chimie appliquée > Département de chimie appliquée

Howdle, Steven

Bras, Wim

Vrolijk, Benno

Language :

English

Title :

A high pressure cell for supercritical CO2 on-line chemical reactions studied with x-ray techniques

Publication date :

2014

Journal title :

Review of Scientific Instruments

ISSN :

0034-6748

eISSN :

1089-7623

Publisher :

American Institute of Physics, New York, United States - New York

Volume :

Pages :

093905

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

http://scitation.aip.org/content/aip/journal/rsi/85/9/10.1063/1.4895717

Available on ORBi :

since 17 November 2014

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