我组郭宇星在J Mol Liq上发表论文
Distinct changes of Debye relaxation in primary and secondary monoalcohols by carbon nano-dots | |
作者： | Yuxing Guo a, Xiao Jin a, Zhenhui Kang b, ∗∗, Li-Min Wang a, ∗ |
单位： | a State Key Lab of Metastable Materials Science and Technology, and College of Materials Science and Engineering, Yanshan University, Qinhuangdao, Hebei, 066004, China b College of Nano Science & Technology, Soochow University, Soochow, Jiangshu, 215123, China |
摘要： | The origin of the dielectric Debye relaxation in monoalcohols has kept interests for decades. In this work, we explored the Debye relaxation in a primary alcohol, 2-ethyl-1-hexanol, and a secondary one, 4-methyl-3-heptanol,by doping with carbon nano-dots. Dielectric and infrared spectra of the pure and doped samples were measured.We found that doping in 2-ethyl-1-hexanol decreases slightly the Debye relaxation strength together with a subtle decrease in the relaxation time, while, strikingly, the Debye relaxation strength in 4-methyl-3-heptanol is enhanced significantly, accompanied by increased relaxation time. Differently, the relaxation strength of thestructural α-relaxation is both enhanced in the two monoalcohols. The infrared measurements reveal an evidentincrease in the fraction of associated hydrogen bonds for the doped 4-methyl-3-heptanol when compared to thepure sample. In contrast, only trivial difference is exhibited for the case of 2-ethyl-1-hexanol and its doped one.The remarkable effects of the carbon nano-dots on the Debye relaxation in the tested 4-methyl-3-heptanol sample could suggest the preferential transition from H-bond rings to chains. |
影响因子： | 5.065 |
分区情况： | 2区 |
链接： | https://www.sciencedirect.com/science/article/pii/S0167732219310864?via%3Dihub |