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Aggregation of sodium dodecyl sulfonate studied by NMR self-diffusion

机译：NMR自扩散研究十二烷基磺酸钠的聚集

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SURFACTANT-POLYMER flooding has received much attention recently because it is an efficientpetroleum recovery process. The optimum efficiency is due to its ability to improve the characteristics of the interface between the solid surface of the micropores of cores, the ground water, and oil included in the oil reservoirs. Surfactant moleculesaggregate in water solution can allow ultra low interfacial tension (IFT) between oil and water to be achieved so that oil production is favorable. Nuclear magnetic resonance (NMR) measurement provides information about Brownian movement of various kindsof molecules in solution of multicomponent, from which aggregation process can be deduced. It is of great significance for the study of the formation of ultra low IFT to improve the technology of petroleum recovery and lower the production cost, The traditional NMR measurement of the self-diffusion coefficient is the PGSE (pulse gradient spin echo) method. However, this method has the following disadvantages: (i) the magnetization is transverse throughout so that spin relaxation depends on T_2; ( ii )J-modulation effects may appear in the spectrum when spin coupling is present; ( ii! ) eddy currents induced by the first gradient pulse cause the effects of the two pulses to be unequal, and ( iV ) eddy currents induced by the second gradient pulse mayinterfere with data collection. In order to overcome these disadvantages cited above, pulse sequences based on stimulated echo (SET) advanced by Hahn are flourishing and have found wide application.
机译：表面活性剂-聚合物驱最近因其是高效的石油采收过程而备受关注。最佳效率是由于其能够改善岩心微孔的固体表面，地下水和储油罐中所含油之间的界面特性的能力。水溶液中聚集的表面活性剂分子可实现油与水之间的超低界面张力（IFT），从而有利于产油。核磁共振（NMR）测量提供有关多组分溶液中各种分子的布朗运动的信息，从中可以推断出聚集过程。对于研究超低IFT的形成对提高石油采收率技术，降低生产成本具有重要意义。传统的NMR自扩散系数的测量方法是PGSE（脉冲梯度自旋回波）方法。但是，该方法具有以下缺点：（i）磁化在整个过程中都是横向的，因此自旋弛豫取决于T_2; （ii）自旋耦合存在时，J调制效应可能会出现在光谱中;由第一个梯度脉冲感应的（ii！）涡流导致两个脉冲的影响不相等，并且由第二个梯度脉冲感应的（iV）涡流可能会干扰数据收集。为了克服以上提到的这些缺点，基于由哈恩提出的受激回波（SET）的脉冲序列正在蓬勃发展，并且已经得到广泛应用。

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