Using small angle scattering and contrast matching to understand molecular packing in low molecular weight gels

Draper, E. R. et al. (2020) Using small angle scattering and contrast matching to understand molecular packing in low molecular weight gels. Matter, 2(3), pp. 764-778. (doi: 10.1016/j.matt.2019.12.028)

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Abstract

It is difficult to determine exactly the molecular packing in the aggregates in low molecular weight gels. Attempts to understand the packing have been made using X-ray diffraction, but there are complications with drying and questions as to whether the crystal structures represent the packing in the gel phase. Here, we exploit contrast matching in small-angle neutron scattering experiments. By preparing selectively deuterated analogs of the same molecule, the scattering from that section of the molecule decreases compared with the hydrogenated molecule. We examine packing in the pre-gelled solutions at high pH and in the gels at low pH. The data from the final gels show a lack of specific order in the aggregates that form the gel matrix. The packing in these systems is not well ordered in the gel state and so implies that it is likely that current models and cartoons are not correct.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Dietrich, Bart and Draper, Emily and McAulay, Dr Kate and Adams, Dave
Authors: Draper, E. R., Dietrich, B., McAulay, K., Brasnett, C., Abdizadeh, H., Patmanidis, I., Marrink, S. J., Su, H., Cui, H., Schweins, R., Seddon, A., and Adams, D. J.
College/School:College of Science and Engineering > School of Chemistry
Journal Name:Matter
Publisher:Elsevier (Cell Press)
ISSN:2590-2393
ISSN (Online):2590-2385
Published Online:29 January 2020
Copyright Holders:Copyright © 2020 The Authors
First Published:First published in Matter 2(3):764-778
Publisher Policy:Reproduced under a Creative Commons license

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
EP/L021978/1
300895Aligning Self-Assembled Materials for Wearable ElectronicsEmily DraperLeverhulme Trust (LEVERHUL)ECF-2017-223Chemistry