Magnetic Resonance Study of Gadolinium-Grafted Nanodiamonds
Magnetic Resonance Study of Gadolinium-Grafted Nanodiamonds
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DOI：
10.1021/acs.jpcc.6b05403
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发表时间：
2016-09-08
影响因子：
3.7
通讯作者：
Vul, A. Ya.
中科院分区：
文献类型：
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作者：
Panich, A. M.;Shames, A. I.;Vul, A. Ya.
我们用EPR、C-13和H-1核磁共振研究了爆轰纳米金刚石颗粒表面接枝了顺磁性Gd离子，这些Gd离子是通过纳米金刚石悬浮液与硝酸Gd水溶液反应，与羧基氢原子进行离子交换而得到的。我们的发现提供了明确的证据，Gd3+离子以化学方式结合到纳米金刚石表面，并与金刚石纳米颗粒的电子和核自旋相互作用，导致电子和核自旋晶格弛豫的加速。提出了Gd3+离子在含氧基团封端的DND表面的定位模型。通过弛豫测量，估算出Gd离子与纳米金刚石表面的距离为0.32 nm。讨论了所研究的纳米材料在生物医学上的应用。
We report on EPR and C-13 and H-1 NMR studies of detonation nanodiamond particles with surface grafted by paramagnetic gadolinium ions obtained by ion exchange with hydrogen atoms of carboxyl groups through the reaction of aqueous nanodiamond suspension with an aqueous solution of gadolinium nitrate. Our findings give clear evidence that Gd3+ ions are chemically bound to the nanodiamond surface and interact with electron and nuclear spins of the diamond nanoparticle, which results in acceleration of electron and nuclear spin lattice relaxations. A model of positioning of Gd3+ ions on the DND surface terminated by oxygen containing groups is suggested. The distance between the Gd ion and nanodiamond surface is estimated by relaxation measurements as 0.32 nm. Biomedical applications of the studied nanomaterials are discussed.