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Existence of two-dimensional physical gels even at zero surface pressure at the air/water interface: rheology of self-assembled domains of small molecules

Films of mesoscopic domains self-assembled from fluorocarbon/hydrocarbon diblock copolymers (FnHm) at the air/water interface were found to display highly elastic behavior. We determined the interfacial viscoelasticity of domain-patterned FnHm Langmuir monolayers by applying periodic shear stresses....

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Bibliographic Details
Main Authors: Veschgini, Mariam (Author) , Habe, Taichi (Author) , Mielke, Salomé (Author) , Inoue, Shigeto (Author) , Tanaka, Motomu (Author)
Format: Article (Journal)
Language:English
Published: 14 August 2017
In: Angewandte Chemie. International edition
Year: 2017, Volume: 56, Issue: 41, Pages: 12603-12607
ISSN:1521-3773
DOI:10.1002/anie.201707009
Online Access:Verlag, Volltext: http://dx.doi.org/10.1002/anie.201707009
Verlag, Volltext: https://onlinelibrary.wiley.com/doi/abs/10.1002/anie.201707009
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Author Notes:Mariam Veschgini, Taichi Habe, Salomé Mielke, Shigeto Inoue, Xianhe Liu, Marie Pierre Krafft, Motomu Tanaka
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Summary:Films of mesoscopic domains self-assembled from fluorocarbon/hydrocarbon diblock copolymers (FnHm) at the air/water interface were found to display highly elastic behavior. We determined the interfacial viscoelasticity of domain-patterned FnHm Langmuir monolayers by applying periodic shear stresses. Remarkably, we found the formation of two-dimensional gels even at zero surface pressure. These monolayers are predominantly elastic, which is unprecedented for surfactants, exhibiting gelation only at high surface pressures. Systematic variation of the hydrocarbon (n=8; m=14, 16, 18, 20) and fluorocarbon (n=8, 10, 12; m=16) block lengths demonstrated that subtle changes in the block length ratio significantly alter the mechanics of two-dimensional gels across one order of magnitude. These findings open perspectives for the fabrication of two-dimensional gels with tuneable viscoelasticity via self-assembly of mesoscale, low-molecular-weight materials.
Item Description:Gesehen am 20.09.2018
Physical Description:Online Resource
ISSN:1521-3773
DOI:10.1002/anie.201707009

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