ATR-FTIR spectroscopic imaging with variable angles of incidence of crude oil deposits formed by flocculant flow

IF 4.3 2区化学 Q1 SPECTROSCOPY Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy Pub Date : 2024-10-20 DOI:10.1016/j.saa.2024.125310

Anton S. Shalygin

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Abstract

Attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopic imaging is a method for spatially resolved analysis of materials that combines the capabilities of ATR-FTIR spectroscopy with the use of a focal plane array detector. This paper presents the methodological aspects of adapting the ATR accessory with variable single reflection angle to the FTIR spectroscopic imaging method. The use of a variable reflection angle allows the image to be studied at different sample depths. Using examples of BMIMPF₆ ionic liquid and crude oil droplets placed on the working surface of an internal reflection element, the characteristics of image acquisition as the angle of reflection is varied are discussed. The possibility of obtaining crude oil deposits directly on the working surface of the internal reflection element under the influence of a flocculant flow (n-heptane, acetone) and their study by ATR-FTIR spectroscopic image was demonstrated. Crude oil deposits were obtained under different formation conditions (flow rates of flocculant) and their spectroscopic images were also obtained at different single reflection angles. This information gives an indication of the composition of the deposit’s functional groups not only at spatial resolution but also at depth.

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以不同入射角对絮凝剂流动形成的原油沉积物进行 ATR-FTIR 光谱成像。

衰减全反射傅立叶变换红外（ATR-FTIR）光谱成像是一种对材料进行空间分辨分析的方法，它将 ATR-FTIR 光谱的功能与焦平面阵列探测器的使用相结合。本文介绍了将具有可变单反射角的 ATR 附件与傅立叶变换红外光谱成像方法相适应的方法学方面。使用可变反射角可以研究不同样品深度下的图像。以置于内反射元件工作面上的 BMIMPF6 离子液体和原油液滴为例，讨论了随着反射角度的变化而获取图像的特点。演示了在絮凝剂（正庚烷、丙酮）流动的影响下，直接在内部反射元件的工作面上获得原油沉积物，并通过 ATR-FTIR 光谱图像对其进行研究的可能性。在不同的形成条件（絮凝剂流速）下获得了原油沉积物，并在不同的单一反射角度下获得了它们的光谱图像。这些信息不仅在空间分辨率上，而且在深度上都显示了沉积物的官能团组成。

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来源期刊

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 物理-光谱学

CiteScore

8.40

自引率

11.40%

发文量

1364

审稿时长

40 days

期刊介绍： Spectrochimica Acta, Part A: Molecular and Biomolecular Spectroscopy (SAA) is an interdisciplinary journal which spans from basic to applied aspects of optical spectroscopy in chemistry, medicine, biology, and materials science. The journal publishes original scientific papers that feature high-quality spectroscopic data and analysis. From the broad range of optical spectroscopies, the emphasis is on electronic, vibrational or rotational spectra of molecules, rather than on spectroscopy based on magnetic moments. Criteria for publication in SAA are novelty, uniqueness, and outstanding quality. Routine applications of spectroscopic techniques and computational methods are not appropriate. Topics of particular interest of Spectrochimica Acta Part A include, but are not limited to: Spectroscopy and dynamics of bioanalytical, biomedical, environmental, and atmospheric sciences, Novel experimental techniques or instrumentation for molecular spectroscopy, Novel theoretical and computational methods, Novel applications in photochemistry and photobiology, Novel interpretational approaches as well as advances in data analysis based on electronic or vibrational spectroscopy.