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arXiv 1502.06214cond-mat.mes-hallquant-ph
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长自旋弛豫时间超极化纳米金刚石

Hyperpolarized Nanodiamond with Long Spin Relaxation Times

Ewa Rej, Torsten Gaebel, Thomas Boele, David E. J. Waddington, David J. Reilly

摘要:

在磁共振(MR)中使用超极化剂,如13C标记的化合物,可以实现强大的新成像和检测模式,这些模式源于10,000倍的信号增强。超极化技术未来的一个主要挑战是固有的短自旋弛豫时间,对于13 C液态化合物通常< 60秒,这限制了信号保持增强的时间。在这里,我们证明了合成纳米金刚石(ND)中的1.1%天然丰度13C自旋可以在低温和室温下超极化,而不使用有毒的自由基,并且由于它们的固态环境,表现出超过1小时的弛豫时间。结合已经建立的应用程序的ND在生命科学中作为廉价的荧光标记物和非细胞毒性基板的基因和药物输送,这些结果扩展到超极化MR领域的纳米级金刚石的治疗诊断能力。

英文摘要:

The use of hyperpolarized agents in magnetic resonance (MR), such as 13C-labeled compounds, enables powerful new imaging and detection modalities that stem from a 10,000-fold boost in signal. A major challenge for the future of the hyperpolarizaton technique is the inherently short spin relaxation times, typically < 60 seconds for 13C liquid-state compounds, which limit the time that the signal remains boosted. Here, we demonstrate that 1.1% natural abundance 13C spins in synthetic nanodiamond (ND) can be hyperpolarized at cryogenic and room temperature without the use of toxic free- radicals, and, owing to their solid-state environment, exhibit relaxation times exceeding 1 hour. Combined with the already established applications of NDs in the life-sciences as inexpensive fluorescent markers and non-cytotoxic substrates for gene and drug delivery, these results extend the theranostic capabilities of nanoscale diamonds into the domain of hyperpolarized MR.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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