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Luminescent probe synthesis for oxygen visualization technique: Application to the effect of surfactant structure on oxygen mass transfer
Chemical Engineering Science ( IF 4.1 ) Pub Date : 2022-07-19 , DOI: 10.1016/j.ces.2022.117921
Gaëlle Lebrun , Bilal El Mokdad , Claude Le Men , Véronique Pimienta , Christophe Coudret , Clément Roux , Gilles Hébrard , Nicolas Dietrich

Planar Laser Induced Fluorescence with Inhibition (PLIF-I) is a powerful technique for studying the local gas/liquid oxygen mass transfer from a single rising bubble. However, to track oxygen in the liquid phase, it is necessary to use an oxygen sensitive luminescent probe, which needs to be unreactive toward the liquid phase. This article presents the synthesis of a fluorophore, [Ru(dpp-diSO3)3]Na4, to be used in liquid phases containing anionic molecules. To avoid electrostatic interactions, the fluorophore and the component present in the liquid phase need to have the same charge. Thanks to the use of this new luminescent probe in PLIF-I application, the influence of the chain length of anionic surfactants (dodecyl sulfate sodium salt and tetradecyl sulfate sodium salt) on oxygen mass transfer has been studied at different concentrations (1.3 × 10-3-2.5 × 10-7 mol.L-1). Results show that, for a given bulk concentration, the longer the hydrophobic chain, the greater the decrease in velocity and mass transfer coefficient. These results are compared with those of a previous paper dealing with length of cationic and nonionic surfactants and a correlation is proposed, taking account of the intrinsic properties of surfactants and their concentration in the liquid phase.



中文翻译:

用于氧可视化技术的发光探针合成:应用于表面活性剂结构对氧传质的影响

平面激光诱导荧光抑制 (PLIF-I) 是一种强大的技术,用于研究单个上升气泡的局部气/液氧传质。然而,为了追踪液相中的氧,需要使用氧敏感的发光探针,该探针需要对液相不反应。本文介绍了荧光团 [Ru(dpp-diSO 3 ) 3 ]Na 4的合成, 用于含有阴离子分子的液相。为了避免静电相互作用,荧光团和液相中存在的成分需要具有相同的电荷。由于在 PLIF-I 应用中使用了这种新型发光探针,研究了不同浓度(1.3 × 10 - 3 -2.5 × 10 -7 mol.L -1)。结果表明,对于给定的体积浓度,疏水链越长,速度和传质系数的下降幅度越大。这些结果与之前处理阳离子和非离子表面活性剂长度的论文的结果进行了比较,并提出了相关性,同时考虑了表面活性剂的固有性质及其在液相中的浓度。

更新日期:2022-07-21
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