Sample age effect on parameters of dynamic nuclear polarization in certain difluorobenzen isomers/MC800 asphaltene suspensions

OVALIOĞLU H.

OPEN CHEMISTRY, cilt.20, sa.1, ss.97-104, 2022 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 20 Sayı: 1
  • Basım Tarihi: 2022
  • Doi Numarası: 10.1515/chem-2021-0114
  • Dergi Adı: OPEN CHEMISTRY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, CAB Abstracts, Veterinary Science Database, Directory of Open Access Journals
  • Sayfa Sayıları: ss.97-104
  • Anahtar Kelimeler: difluorobenzene, asphaltene, dynamic nuclear polarization, Overhauser effect, ELECTRON DOUBLE-RESONANCE, MAGNETIC-FIELDS, INHIBITION, DNP
  • Bursa Uludağ Üniversitesi Adresli: Evet

Özet

Because of magnetic spin-spin interactivity between F-19 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.