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Characterization of Dipeptide-based Sorbent Materials using Combined Thermodynamic and Inelastic Neutron Scattering Techniques

Published online by Cambridge University Press:  01 July 2015

Daniele Paradiso
Affiliation:
Department of Chemistry, University of Tennessee, Knoxville, TN, United States.
Enrico Perelli Cippo
Affiliation:
CNR - IFP, Milano, Italy.
Giuseppe Gorini
Affiliation:
Department of Physics, Milano-Bicocca University, Milano, Italy.
Giorgio Rossi
Affiliation:
Department of Physics, Università degli Studi di Milano, Milano, Italy.
J. Z. Larese
Affiliation:
Department of Chemistry, University of Tennessee, Knoxville, TN, United States.
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Abstract

Using a combination of x-ray diffraction, volumetric adsorption and inelastic neutron scattering (INS) the adsorption properties of methane within the channels of L-Isoleucyl-L-Valine (IV) and L-Valyl-L-Alanine (VA) dipeptides have been investigated. These biomaterials have quasi one-dimensional channels of tunable diameters in the range of 3-6 Å and offer possibilities for selective adsorption, as well as, water and gas transport properties. High-resolution volumetric methane adsorption measurements performed near 100K for IV find that this biomaterial exhibits an adsorption capacity of ∼100 m2/g. High-resolution Inelastic Neutron Scattering (INS) measurements were performed at the Spallation Neutron Source using the BASIS spectrometer with ∼ 3.5 μeV resolution. The data clearly indicate that at least two spectral features at energy transfers near 100 and 200 μeV are present, which suggests a lowering of the hindering potential for methane reorientation primarily about the three-fold axis within the IV channels. Such features play a key role in understanding details concerning the potential energy surface. These thermodynamic and INS studies suggest that the flexibility and dynamical motion within the dipeptide channels may play a significant role in the adsorption properties.

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Copyright
Copyright © Materials Research Society 2015 

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