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Infrasorb: Optical detection of the heat of adsorption for high throughput adsorption screening of porous solids

: Wollmann, P.; Leistner, M.; Grählert, W.; Throl, O.; Dreisbach, F.; Kaskel, S.


Microporous and mesoporous materials 149 (2012), No.1, pp.86-94
ISSN: 1387-1811
Journal Article
Fraunhofer IWS ()
adsorption; high-throughput screening; infrared detection; porous materials; surface area

The demand for fast screening methods in modern materials chemistry led to the development of a room temperature operated high-throughput tool for adsorption screening. Within five minutes a porosity screening of a large sample pool can be realized. Using a variety of different porous materials (activated carbons, porous polymers, metal-organic frameworks, zeolites) and the test gas n-butane, the reliability of the new instrument is shown. Furthermore, possible applications in the determination of n-butane capacities and BET surface areas are given as well as the application in synthesis or product control. The presented data exhibit high quality factors for the correlation of integrated signal intensity (heat of adsorption) and specific surface areas (above 0.97). As an example for the applicability of other gases that can be used with this tool, screening measurements using cyclohexane as test gas are also presented. The developed automated screening tool is an important step to overcome the bottle-neck between high-throughput syntheses technologies developed in the last decades and measurement of adsorption properties.