Prospect for characterizing interacting soft colloidal structures using spin-echo small angle neutron scattering

Chen, Wei -Ren; Herwig, Kenneth W.; Li, Xin; Liu, Emily; Liu, Yun; Pynn, Roger; Robertson, J. Lee; Shew, Chwen -Yang; Smith, Gregory Scott

doi:10.1063/1.3559451

Title: Prospect for characterizing interacting soft colloidal structures using spin-echo small angle neutron scattering

Journal Article · Wed Mar 02 00:00:00 EST 2011 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.3559451· OSTI ID:1037626

Chen, Wei -Ren ^[1]; Herwig, Kenneth W. ^[1]; Li, Xin ^[2]; Liu, Emily ^[3]; Liu, Yun ^[4]; Pynn, Roger ^[5]; Robertson, J. Lee ^[1]; Shew, Chwen -Yang ^[6]; Smith, Gregory Scott ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Rensselaer Polytechnic Inst., Troy, NY (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Rensselaer Polytechnic Inst., Troy, NY (United States)
National Institute of Standards and Technology, Gaithersburg, MD (United States); Univ. of Delaware, Newark, DE (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Indiana Univ., Bloomington, IN (United States)
City University of New York, Staten Island, NY (United States)

Spin-echo small angle neutron scattering (SESANS) presents a new experimental tool for structural investigation. Regarding the material study using neutron scattering it is of particular novel: Due to the action of spin echo encoding, SESANS registers the spatial correlations function in real space, which is distinct from the measurables of conventional elastic neutron scattering techniques. To make viable the use of SESANS in structural characterization, particularly for the interacting colloidal suspensions, we have conducted a theoretical study focusing on understanding the essential features of the SESANS correlation functions obtained from different model systems consisting of particles with uniform density profile (J. Chem. Phys. 132, 174509 (2010)). Within the same framework, we continue to explore the prospect of using SESANS to investigate the structural characteristics of colloid systems consisting of particle with non-uniform intraparticle mass distribution. As an example, a Gaussian model of interacting soft colloids is put forward in our mean-field calculations to investigate the manifestation of structural softness in SESANS measurement. Furthermore, the exploration shows a characteristically different SESANS correlation function for interacting soft colloids, in comparison to that of the referential uniform hard sphere system, due to the Abel transform imbedded in the mathematical formalism bridging the SESANS spectra and the spatial autocorrelation.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: AC05-00OR22725

OSTI ID:: 1037626

Journal Information:: Journal of Chemical Physics, Vol. 134, Issue 9; ISSN 0021-9606

Publisher:: American Institute of Physics (AIP)

Country of Publication:: United States

Language:: English

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