Dynamics and Structure of a Bitumen Emulsion as Studied by 1H NMR Diffusometry

被引：2
|
作者：
Filippov, Andrei [1 ]
Soenen, Hilde [2 ]
Blom, Johan [3 ]
Antzutkin, Oleg N. [1 ]
机构：
[1] Lulea Univ Technol, Dept Civil & Environm Engn, Chem Interfaces, SE-97187 Lulea, Sweden
[2] Nynas NV, B-2020 Antwerp, Belgium
[3] Univ Antwerp, Fac Appl Engn, EMIB Res Grp, B-2020 Antwerp, Belgium
来源：
ACS OMEGA | 2023年 / 8卷 / 39期
基金：
瑞典研究理事会;
关键词：
NMR SELF-DIFFUSION; IN-WATER EMULSIONS; PFG NMR; RESTRICTED DIFFUSION; STIMULATED ECHO; OIL EMULSION; GRADIENT; STABILITY; MOLECULES; DROPLETS;
D O I：
10.1021/acsomega.3c05492
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Self-diffusion in a bitumen emulsion was studied by H-1 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 similar to 0.11 mu m. 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-1 NMR spectroscopy and diffusometry of the bitumen emulsion doped with paramagnetic MnSO4(aq) as well as with an additional H-1 NMR study of the emulsion structure, in which emulsion stability was compromised by freezing at 253 K.
引用
收藏
页码：36534 / 36542
页数：9
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