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Small Angle Neutron Scattering (SANS) Studies on the Structural Evolution of Pyromellitamide Self-Assembled Gels

Jamieson, Scott A ; Tong, Katie W. K ; Hamilton, William A ; He, Lilin ; James, Michael ; Thordarson, Pall

Langmuir, 2014-11-25, Vol.30 (46), p.13987-13993 [Peer Reviewed Journal]

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  • Title:
    Small Angle Neutron Scattering (SANS) Studies on the Structural Evolution of Pyromellitamide Self-Assembled Gels
  • Author: Jamieson, Scott A ; Tong, Katie W. K ; Hamilton, William A ; He, Lilin ; James, Michael ; Thordarson, Pall
  • Subjects: Amides - chemistry ; Scattering, Small Angle ; Neutron Diffraction ; Gels ; Models, Chemical ; Benzoates - chemistry ; Index Medicus ; INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
  • Is Part Of: Langmuir, 2014-11-25, Vol.30 (46), p.13987-13993
  • Description: 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.
  • Publisher: United States: American Chemical Society
  • Language: English
  • Identifier: ISSN: 0743-7463
    EISSN: 1520-5827
    DOI: 10.1021/la502546n
    PMID: 25361640
  • Source: © ProQuest LLC All rights reserved

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