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|Title:||Small angle neutron scattering (SANS) studies on the structural evolution of pyromellitamide self-assembled gels|
|Citation:||Langmuir, 2014; 30(46):13987-13993|
|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|
|Appears in Collections:||Chemistry publications|
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