Emergence of strong nonlinear viscoelastic response of semifluorinated alkane monolayers

Viscoelasticity of monolayers of fluorocarbon/hydrocarbon tetrablock amphiphiles di(FnHm) ((CnF2n+1CH2)(Cm-2H2m-3)CH-CH(CnF2n+1CH2)(Cm-2H2m-3)) was characterized by interfacial dilational rheology under periodic oscillation of the moving barriers at the air/water interface. Because the frequency dis...

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Hauptverfasser: Mielke, Salomé (VerfasserIn) , Habe, Taichi (VerfasserIn) , Veschgini, Mariam (VerfasserIn) , Liu, Xianhe (VerfasserIn) , Yoshikawa, Kenichi (VerfasserIn) , Krafft, Marie Pierre (VerfasserIn) , Tanaka, Motomu (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: January 23, 2018
In: Langmuir
Year: 2018, Jahrgang: 34, Heft: 7, Pages: 2489-2496
ISSN:1520-5827
DOI:10.1021/acs.langmuir.7b03997
Online-Zugang:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1021/acs.langmuir.7b03997
Volltext
Verfasserangaben:Salomé Mielke, Taichi Habe, Mariam Veschgini, Xianhe Liu, Kenichi Yoshikawa, Marie Pierre Krafft, and Motomu Tanaka

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520 |a Viscoelasticity of monolayers of fluorocarbon/hydrocarbon tetrablock amphiphiles di(FnHm) ((CnF2n+1CH2)(Cm-2H2m-3)CH-CH(CnF2n+1CH2)(Cm-2H2m-3)) was characterized by interfacial dilational rheology under periodic oscillation of the moving barriers at the air/water interface. Because the frequency dispersion of the response function indicated that di(FnHm) form two-dimensional gels at the interface, the viscosity and elasticity of di(FnHm) were first analyzed with the classical Kelvin-Voigt model. However, the global shape of stress response functions clearly indicated the emergence of a nonlinearity even at very low surface pressures (π ≈ 5 mN/m) and small strain amplitudes (u0 = 1%). The Fourier-transformed response function of higher harmonics exhibited a clear increase in the intensity only from odd modes, corresponding to the nonlinear elastic component under reflection because of mirror symmetry. The emergence of strong nonlinear viscoelasticity of di(FnHm) at low surface pressures and strain amplitudes is highly unique compared to the nonlinear viscoelasticity of other surfactant systems reported previously, suggesting a large potential of such fluorocarbon/hydrocarbon molecules to modulate the mechanics of interfaces using the self-assembled domains of small molecules. 
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