Dahl Margarethe, Gommes Cedric J, Haverkamp René, Wood Kathleen, Prévost Sylvain, Schröer Pierre, Omasta Tomáš, Stank Tim Julian, Hellweg Thomas, Wellert Stefan
Department of Chemistry, Technische Universität Berlin Straße des 17. Juni 124 10623 Berlin Germany
Department of Chemical Engineering, University of Liège B6 A 3 Allée du 6 Août B-4000 Liège Belgium.
RSC Adv. 2024 Sep 4;14(39):28272-28284. doi: 10.1039/d4ra04090b.
We use small-angle neutron scattering (SANS) to investigate the structure and phase behavior of a complex fluid within meso- and macroporous matrices. Specifically, bicontinuous microemulsions of the temperature-dependent ternary system CE-water--octane are investigated in controlled pore glass (CPG) membranes with nominal pore diameters of 10 nm, 20 nm, 50 nm, and 100 nm. The scattering data were analyzed using the Teubner-Strey model and a multiphase generalization of clipped Gaussian-field models. The analysis indicates changes in the phase structure of the bicontinuous microemulsion in the membranes with the smallest pores. This is attributed to a shift in the ternary phase diagram toward a three-phase structure at lower surfactant concentrations. This effect is likely related to a larger internal surface area in the membranes with smaller pores, which enhances surfactant adsorption onto the pore walls.
我们使用小角中子散射（SANS）来研究介孔和大孔基质内复合流体的结构和相行为。具体而言，研究了温度依赖性三元体系CE-水-辛烷的双连续微乳液在标称孔径为10纳米、20纳米、50纳米和100纳米的可控孔径玻璃（CPG）膜中的情况。使用Teubner-Strey模型和截断高斯场模型的多相推广对散射数据进行了分析。分析表明，在孔径最小的膜中，双连续微乳液的相结构发生了变化。这归因于三元相图在较低表面活性剂浓度下向三相结构的转变。这种效应可能与孔径较小的膜中较大的内表面积有关，这增强了表面活性剂在孔壁上的吸附。
