Filippov Andrei, Soenen Hilde, Blom Johan, Antzutkin Oleg N
Chemistry of Interfaces, Department of Civil and Environmental Engineering, Luleå University of Technology, Luleå SE-97187, Sweden.
Nynas N.V., 171 Groenenborgerlaan, Antwerp 2020, Belgium.
ACS Omega. 2023 Sep 21;8(39):36534-36542. doi: 10.1021/acsomega.3c05492. eCollection 2023 Oct 3.
Self-diffusion in a bitumen emulsion was studied by H NMR. The emulsion forms two phases: continuous and dispersed. The continuous aqueous phase contains mainly water, with the energy of activation of the diffusion process equal to that of bulk water, while its diffusivity is smaller than that of bulk water by a factor of 2. The dispersed phase consists of bitumen droplets containing confined water, whose dynamics is characterized by a fully restricted diffusion regime in cavities with sizes of ∼0.11 μm. Therefore, the studied bitumen emulsion can be described by a model of a complex multiple emulsion of the water/oil/water (WOW) type. The suggested model does agree well with data from H NMR spectroscopy and diffusometry of the bitumen emulsion doped with paramagnetic MnSO(aq) as well as with an additional H NMR study of the emulsion structure, in which emulsion stability was compromised by freezing at 253 K.
通过核磁共振氢谱（¹H NMR）研究了沥青乳液中的自扩散。该乳液形成两个相：连续相和分散相。连续水相中主要含有水，扩散过程的活化能与纯水的活化能相当，但其扩散率比纯水小2倍。分散相由含有受限水的沥青液滴组成，其动力学特征是在尺寸约为0.11μm的空腔中处于完全受限的扩散状态。因此，所研究的沥青乳液可以用水/油/水（WOW）型复杂多重乳液模型来描述。所提出的模型与掺有顺磁性硫酸锰（aq）的沥青乳液的核磁共振氢谱光谱和扩散测定数据以及对乳液结构的另一项核磁共振氢谱研究结果非常吻合，在该研究中，乳液在253K下冷冻导致稳定性受损。
