Spin-Spin and spin-lattice relaxation of protons in ferrofluids characterized with a high-Tc SQUID-based NMR spectrometer in microtesla fields

Hong-Chang Yang, S. H. Liao, Chieh Wen Liu, Hsin Hsien Chen, Herng-Er Horng, K. L. Chen, M. J. Chen, Chieh I. Liu, L. M. Wang

研究成果: 雜誌貢獻期刊論文同行評審

1 引文 斯高帕斯(Scopus)

摘要

In this work, the relaxation rates of ferrofluids are characterized using a high-Tc SQUID-based nuclear magnetic resonance spectrometer in different field strengths and temperatures. It was found that the longitudinal relaxation rate, 1/T1 , of ferrofluids measured in a high field strength is significantly higher than that measured in a low field strength. We attribute this to the magnetic-field gradients from the magnetization of magnetic nanoparticles that accelerate the T1-relaxation more in a high strength of magnetic fields than they are in a low strength of magnetic fields. Furthermore, T1 and T2 decrease when temperature increases, where T2 is the transverse relaxation time. This is due to the improved field-homogeneity seen by protons' spins at high temperatures, attributed to the enhanced Brownian motion of magnetic nanoparticles. Characterizing the relaxation rates will be helpful for further use of ferrofluids as contrast agents in low-field MR imagings.

原文英語
文章編號6399572
期刊IEEE Transactions on Applied Superconductivity
23
發行號3
DOIs
出版狀態已發佈 - 2013

ASJC Scopus subject areas

  • 電子、光磁材料
  • 凝聚態物理學
  • 電氣與電子工程

指紋

深入研究「Spin-Spin and spin-lattice relaxation of protons in ferrofluids characterized with a high-Tc SQUID-based NMR spectrometer in microtesla fields」主題。共同形成了獨特的指紋。

引用此