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https://hdl.handle.net/2440/124880
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Type: | Journal article |
Title: | Small angle neutron scattering (SANS) studies on the structural evolution of pyromellitamide self-assembled gels |
Author: | Jamieson, S. Tong, K. Hamilton, W. He, L. James, M. Thordarson, P. |
Citation: | Langmuir: the ACS journal of surfaces and colloids, 2014; 30(46):13987-13993 |
Publisher: | ACS Publishing |
Issue Date: | 2014 |
ISSN: | 0743-7463 1520-5827 |
Statement of Responsibility: | Scott A. Jamieson, Katie W. K. Tong, William A. Hamilton, Lilin He, Michael James and Pall Thordarson |
Abstract: | The kinetics of aggregation of two pyromellitamide gelators, tetrabutyl- (C4) and tetrahexyl-pyromellitamide (C6), in deuterated cyclohexane has been investigated by small angle neutron scattering (SANS) for up to 6 days. The purpose of this study was to improve our understanding of how self-assembled gels are formed. Short-term (< 3 h) time scales revealed multiple phases with the data for the tetrabutylpyromellitamide C4, indicating one-dimensional stacking and aggregation corresponding to a multifiber braided cluster arrangement that is about 35 Å in diameter. The corresponding tetrahexylpyromellitamide C6 data suggest that the C6 also forms one-dimensional stacks but that these aggregate to a thicker multifiber braided cluster that has a diameter of about 62 Å. Over a longer period of time, the radius, persistence length, and contour length all continue to increase in 6 days after cooling. These data suggest that structural changes in self-assembled gels occur over a period exceeding several days and that fairly subtle changes in the structure (e.g., tail-length) can influence the packing of molecules in self-assembled gels on the single-to-few fiber bundle stage. |
Keywords: | Amides Benzoates Gels Neutron Diffraction Models, Chemical Scattering, Small Angle |
Rights: | © 2014 American Chemical Society |
DOI: | 10.1021/la502546n |
Grant ID: | http://purl.org/au-research/grants/arc/DP130101512 http://purl.org/au-research/grants/arc/FT120100101 |
Published version: | http://dx.doi.org/10.1021/la502546n |
Appears in Collections: | Aurora harvest 8 Chemistry publications |
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