Ovalioglu, Hüseyin. “Sample Age Effect on Parameters of Dynamic Nuclear Polarization in Certain Difluorobenzen Isomers/MC800 Asphaltene Suspensions.” Open Chemistry 20, no. 1 (February 22, 2022): 97–104.
Because of magnetic spin–spin interactivity between 19F nucleus of the solvent and delocalized electrons on the MC800 asphaltene, the Overhauser dynamic nuclear polarization (DNP) method is able to give a substantial boost in the signal acquired from studies focused on nuclear magnetic resonance (NMR). The suspensions of asphaltene in diﬂuorobenzene isomers were studied using Overhauser eﬀect type DNP and NMR investigations at room temperature in a small magnetic ﬁeld of 1.53 mT. The used asphaltene was obtained from MC800 liquid asphalt from Heavy Iran. Each sample of the solvent medium was produced at three diﬀerent concentrations of asphaltene. These samples were stored in the refrigerator for 7 years, until DNP parameters were found by new DNP tests. As a result, the inﬂuence of sample age on parameters of DNP was studied, and then the ﬁndings were analyzed.