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Estudio de resonancia magnética de mesa sobre el ángulo de contacto de la interfaz sólido-líquido
resonancia magnética de mesa can be used to obtain images of water-glass-oil interface and water-glass-benzene interface that are difficult to obtain by ordinary optical methods, and the contact angle of the interface can be studied by resonancia magnética de mesa tecnología.
The measurement of the contact angle of transparent liquids generally uses optical methods to obtain data. Sin embargo, optical methods cannot measure the three-phase contact angles formed by two immiscible transparent liquids and solids. MRI can compensate for the defects of optical methods through NMR. Imaging can study the contact angle of the interface.
Solid-liquid contact angle
The concept of contact angle originates from the gas-liquid-solid three-phase interface, and the angle between the gas-liquid and solid-liquid interface is called the contact angle. When the gas in the definition is changed to another incompatible liquid, a liquid-solid-liquid contact angle is formed.
Schematic diagram of general contact angle definition
The following figure shows the contact angle formed by solid particles on the oil-water interface. Its size determines the type and stability of the emulsion that may be formed, which plays an important role in oil and gas production and transportation.
Three different contact angles formed by solid particles on the water-oil interface
Measuring the contact angle of solid-liquid interface with Benchtop MRI technology
The spin echo pulse sequence and inversion recovery pulse sequence of NMR technology can realize proton density imaging, T1-weighted imaging, Imágenes potenciadas en T2, etc.. of small-volume liquid samples. Different types of NMR signals can be distinguished by imaging, so that two hydrogen-containing liquids can be separated on the image gray level and a clear image of the contact angle can be obtained.
