Small-angle scattering and morphologies of ultra-flexible microemulsions

被引:45
|
作者
Prevost, Sylvain [1 ]
Lopian, Tobias [2 ,3 ]
Pleines, Maximilian [2 ,3 ]
Diat, Olivier [2 ]
Zemb, Thomas [2 ]
机构
[1] ESRF European Synchrotron, 71 Ave Martyrs, F-38000 Grenoble, France
[2] CEA CNRS UM2 ENCSM, UMR 5257, ICSM, F-30207 Bagnols Sur Ceze, France
[3] Univ Regensburg, Inst Phys & Theoret Chem, D-93040 Regensburg, Germany
关键词
ultra-flexible microemulsions; surfactant-free microemulsions; mesoscale solubilization; small-angle scattering (SAS); ternary phase diagrams; SURFACTANT-FREE MICROEMULSIONS; WEAKLY STRUCTURED MIXTURES; METHANOL PLUS 1-OCTANOL; X-RAY-SCATTERING; NEUTRON-SCATTERING; BICONTINUOUS MICROEMULSIONS; TERNARY-SYSTEMS; BINARY-MIXTURES; WATER; ETHANOL;
D O I
10.1107/S1600576716016150
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The phase diagrams of ternary mixtures of partly miscible solvents containing a hydrotropic co-solvent exhibit a variable miscibility gap and one critical point. This work investigates the entire monophasic region far from and near to the miscibility gap in octan-1-ol/ethanol/water, for which ultra-flexible microemulsions (UFMEs) are observed by small-angle scattering techniques. SWAXS (combined small-and wide-angle X-ray scattering) allows the elucidation of these types of structure. Three distinct areas can be identified in the phase diagram, with scattering data resembling those from direct, bicontinuous and reverse local structures. These UFMEs are far more polydisperse than their surfactant-based counterparts. Water-rich and solvent-rich domains are only delimited by a small excess of hydrotrope, instead of a well defined surfactant layer of fixed area per molecule. It is shown that all scattering spectra obtained for the nanostructured compositions can be modelled by a simple unified analytical model composed of two uncorrelated contributions. The main one is the Ornstein-Zernike formula for composition fluctuations which gives information about the pseudo-phase domain size. The second is a Lorentzian that captures the structure of at least one of the coexisting pseudo-phases. No Porod law can be measured in the SAXS domain. The proposed expression gives access to two characteristic sizes as well as one inter-aggregate distance.
引用
收藏
页码:2063 / 2072
页数:10
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