Influence of Perfluorohexane-Enriched Atmosphere on Viscoelasticity and Structural Order of Self-Assembled Semifluorinated Alkanes at the Air-Water Interface.

Influence of Perfluorohexane-Enriched Atmosphere on Viscoelasticity and Structural Order of Self-Assembled Semifluorinated Alkanes at the Air-Water Interface.
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富全氟己烷气氛对空气-水界面自组装半氟化烷烃粘弹性和结构有序的影响

DOI:
10.1002/cphc.201900316
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发表时间:
2019
期刊:
Chemphyschem : a European journal of chemical physics and physical chemistry
影响因子:
--
通讯作者:
M. Tanaka
M. Tanaka
中科院分区:
--
文献类型:
--
作者:
S. Mielke;W. Abuillan;M. Veschgini;X. Liu;O. Konovalov;M.P. Krafft;M. Tanaka

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摘要:半氟化烷烃FnHm在空气-水界面自组装成纳米尺寸的表面胶束。在这项研究中,我们结合膨胀流变学和掠入射小角X射线散射(GISAXS)研究了富含全氟己烷(PFH)的大气如何影响单层FnHm的界面粘弹性和结构有序。单层主要表现出弹性,这可归因于表面域的强偶极排斥。大气中富含 PFH 会导致压缩性增加和弹性模量降低,但不会将 FnH 分子的结构排序改变为高度相关的纳米域,这表明 PFH 分子吸附到域之间的自由空间。 FnHm 域在 PFH 气体存在下保持结构完整性的能力有望用于制造用于超声成像的稳定微泡。
Abstract: Semifluorinated alkanesFnHmself‐assemble into nanometer‐sized surface micelles at the air‐water interface. In this study, we investigated how an atmosphere enriched with perfluorohexane (PFH) influences the interfacial viscoelasticity and structural order of a monolayer ofFnHmby the combination of dilational rheology and grazing‐incidence small‐angle X‐ray scattering (GISAXS). The monolayers behaved predominantly elastic which can be attributed to the strong dipole repulsions of the surface domains. Enrichment of the atmosphere with PFH lead to an increase of the compressibility and a decrease of the elastic modulus without altering the structural ordering of theFnHmmolecules into highly correlated nanodomains, suggesting the adsorption of PFH molecules to the free spaces between the domains. The capability ofFnHmdomains to retain the structural integrity in the presence of PFH gas is promising for the fabrication of stable microbubbles for sonographic imaging.
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