Ripening of Nonaqueous Emulsions of n-Decane in Dimethyl Sulfoxide Observed by Time-Resolved Spin-Echo Small-Angle Neutron Scattering (SESANS).

IF 3.7 2区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Langmuir Pub Date : 2025-05-19 DOI:10.1021/acs.langmuir.4c05364

E Wouter Grünewald,Robert M Dalgliesh,Steven R Parnell,Wim G Bouwman,Gregory N Smith

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Abstract

Since macroemulsions are only kinetically stable, characterizing their behavior as they change over time is relevant to their application. Time-of-flight spin-echo small-angle neutron scattering (SESANS) enables time-resolved measurement of the bulk evolution of concentrated, opaque emulsions without perturbing the system. Here, we present time-of-flight SESANS measurements of an n-decane-in-DMSO emulsion stabilized by Pluronic P-123, where changes in the system as it ripened were resolved. The radius of emulsion droplets were shown to grow over time with a rate of 25 μm3 h-1, suggesting that Ostwald ripening is the dominant aging process. Furthermore, SANS measurements revealed the presence of a stable population of swollen surfactant micelles, providing an additional mechanism for mass transfer between particles. Since time-of-flight SESANS can be used to obtain information about particle sizes, ripening rates, and associated processes, it is uniquely suited for studying the behavior of dense colloidal systems over time.

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用时间分辨自旋回波小角中子散射（SESANS）观察二甲基亚砜中正癸烷非水乳液的成熟过程。

由于大乳剂仅具有动力学稳定性，表征它们随时间变化的行为与它们的应用有关。飞行时间自旋回波小角中子散射（SESANS）可以在不干扰系统的情况下，对浓缩、不透明乳剂的体积演化进行时间分辨测量。在这里，我们展示了Pluronic P-123稳定的dmso中正癸烷乳液的飞行时间SESANS测量，其中系统成熟时的变化被解决了。随着时间的推移，乳化液滴半径以25 μm3 h-1的速率增大，表明奥斯特瓦尔德成熟是主要的老化过程。此外，SANS测量显示存在稳定的膨胀表面活性剂胶束，为颗粒之间的传质提供了额外的机制。由于飞行时间SESANS可用于获取有关颗粒大小，成熟速率和相关过程的信息，因此它非常适合研究致密胶体系统随时间的行为。

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来源期刊

Langmuir 化学-材料科学：综合

CiteScore

6.50

自引率

10.30%

发文量

1464

审稿时长

2.1 months

期刊介绍： Langmuir is an interdisciplinary journal publishing articles in the following subject categories: Colloids: surfactants and self-assembly, dispersions, emulsions, foams Interfaces: adsorption, reactions, films, forces Biological Interfaces: biocolloids, biomolecular and biomimetic materials Materials: nano- and mesostructured materials, polymers, gels, liquid crystals Electrochemistry: interfacial charge transfer, charge transport, electrocatalysis, electrokinetic phenomena, bioelectrochemistry Devices and Applications: sensors, fluidics, patterning, catalysis, photonic crystals However, when high-impact, original work is submitted that does not fit within the above categories, decisions to accept or decline such papers will be based on one criteria: What Would Irving Do? Langmuir ranks #2 in citations out of 136 journals in the category of Physical Chemistry with 113,157 total citations. The journal received an Impact Factor of 4.384*. This journal is also indexed in the categories of Materials Science (ranked #1) and Multidisciplinary Chemistry (ranked #5).