The paper presents results demonstrating, using a series of crude oil samples, the negative impact of resin glass transition effects on the accurate determination of the solid-state component of the NMR signal attributed to crystalline paraffins. To address this issue, a modified NMR-based method for quantifying paraffins and asphaltenes is proposed. The approach involves separating the crystallization temperature of paraffins from the glass transition temperature of resins by plasticizing the resins through the preliminary addition of a specific amount of solvent or precipitant to the crude oil.

The effect of the hydrothermal treatment temperature of a colloidal solution of LaF₃ nanoparticles in an autoclave (60–140 ^◦C) on the particle size, the size of the coherent scattering region, and the concentration of paramagnetic centers has been studied. The samples were characterized using X-ray diffraction, transmission electron microscopy and magnetic resonance methods. The optimal hydrothermal treatment temperature has been determined to obtain particles with the largest size, best crystallinity, and minimum paramagnetic center content for practical applications. Theoretical estimates of the ¹⁹F nuclear magnetic relaxation times for synthesized LaF₃ samples are presented, which are in good agreement with experimental data. The work may be useful in understanding the effect of hydrothermal treatment on the structure and magnetic interactions in nanoscale fluorides.