A non-invasive method to directly quantify surface heterogeneity of porous materials

Nature Communications
Wei-Shan ChiangYun Liu

Abstract

It is extremely challenging to measure the variation of pore surface properties in complex porous systems even though many porous materials have widely differing pore surface properties at microscopic levels. The surface heterogeneity results in different adsorption/desorption behaviors and storage capacity of guest molecules in pores. Built upon the conventional Porod's law scattering theory applicable mainly to porous materials with relatively homogeneous matrices, here we develop a generalized Porod's scattering law method (GPSLM) to study heterogeneous porous materials and directly obtain the variation of scattering length density (SLD) of pore surfaces. As SLD is a function of the chemical formula and density of the matrix, the non-invasive GPSLM provides a way to probe surface compositional heterogeneity, and can be applied to a wide range of heterogeneous materials especially, but not limited to, porous media and colloids, using either neutron or X-ray scattering techniques.

References

May 29, 2004·Analytical Chemistry·Elaine BiddissDongqing Li
Dec 14, 2007·Journal of Colloid and Interface Science·Emilienne M ZuyderhoffChristine C Dupont-Gillain
Jan 6, 2012·Environmental Science & Technology·Yangyang Liu, Jennifer Wilcox
Feb 27, 2014·Physical Chemistry Chemical Physics : PCCP·Daniela StoeckelBernd M Smarsly
Jun 20, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Robert R SmithJerry Y Y Heng
Aug 12, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·Wei-Shan ChiangYun Liu
Sep 28, 2017·The Analyst·Danyal TurkogluRolf Zeisler

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Methods Mentioned

BETA
X-ray
AFM
small-angle
SANS
small-angle neutron scattering
Gamma-ray

Software Mentioned

GPS
GPSLM
Prompt Gamma - ray Activation Analysis ( PGAA
REFPROP

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