Nuclear Magnetic Resonance and Overhauser effect type dynamic nuclear polarization (DNP) experiments were performed to study suspensions of asphaltene in the fluorocarbons at a low magnetic field of 1.53 mT at room temperature. Asphaltene was extracted from MC800 liquid asphalt, which was Heavy Iran origin. Each sample of the solvent medium was produced at three different concentrations of asphaltene. These samples were kept for a period of seven years until DNP parameters were discovered through new DNP tests. The influence of sample age on parameters of DNP was studied and then the findings were analyzed. It was found that the  nuclear-electron coupling parameter was smaller. In low magnetic fields the nuclear-electron coupling parameter. varies from +0.5 (pure dipolar) to -1.0 (pure scalar), and new  obtained values are between these limits. New  values in our study are positive and this shows that the dipolar part of intermolecular spin-spin interactions is dominant.

中文翻译：

---

碳氟化合物样品年龄对 MC800 沥青质动态核极化参数的影响

进行了核磁共振和奥弗豪塞效应型动态核极化 (DNP) 实验，以研究在室温下在 1.53 mT 的低磁场下沥青质在碳氟化合物中的悬浮液。沥青质是从重伊朗产的 MC800 液态沥青中提取的。每个溶剂介质样品都是在三种不同浓度的沥青质下生产的。这些样品保存了七年，直到通过新的 DNP 测试发现 DNP 参数。研究了样本年龄对DNP参数的影响，然后对结果进行了分析。发现核-电子耦合参数更小。在低磁场中，核电子耦合参数。 从 +0.5（纯偶极）到 -1.0（纯标量）变化，新获得的  值介于这些限制之间。