Spin-spin relaxation of protons in ferrofluids characterized with a high-T c superconducting quantum interference device-detected magnetometer in microtesla fields

Shu Hsien Liao; Chieh Wen Liu; Hong Chang Yang; Hsin Hsien Chen; Ming Jye Chen; Kuen Lin Chen; Herng Er Horng; Li Min Wang; Shieh Yueh Yang

doi:10.1063/1.4723842

Spin-spin relaxation of protons in ferrofluids characterized with a high-T _c superconducting quantum interference device-detected magnetometer in microtesla fields

Shu Hsien Liao, Chieh Wen Liu, Hong Chang Yang^*, Hsin Hsien Chen, Ming Jye Chen, Kuen Lin Chen, Herng Er Horng, Li Min Wang, Shieh Yueh Yang

^*此作品的通信作者

研究成果: 雜誌貢獻 › 期刊論文 › 同行評審

6 引文斯高帕斯（Scopus）

摘要

In this work, the spin-spin relaxation of protons in ferrofluids is characterized using a high-T _c SQUID-based detector in microtesla fields. We found that spin-spin relaxation rate is enhanced in the presence of superparamagnetic nanoparticles. The enhanced relaxation rates are attributed to the microscopic field gradients from magnetic nanoparticles that dephase protons' spins nearby. The relaxation rates decrease when temperatures increase. Additionally, the alternating current magnetic susceptibility was inversely proportional to temperature. Those characteristics explained the enhanced Brownian motion of nanoparticles at high temperatures. Characterizing the relaxation will be helpful for assaying bio-molecules and magnetic resonance imaging in microtesla fields.

原文	英語
文章編號	232405
期刊	Applied Physics Letters
卷	100
發行號	23
DOIs	https://doi.org/10.1063/1.4723842
出版狀態	已發佈 - 2012 6月 4

ASJC Scopus subject areas

物理與天文學（雜項）

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10.1063/1.4723842

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Liao, S. H., Liu, C. W., Yang, H. C., Chen, H. H., Chen, M. J., Chen, K. L., Horng, H. E., Wang, L. M., & Yang, S. Y. (2012). Spin-spin relaxation of protons in ferrofluids characterized with a high-T _c superconducting quantum interference device-detected magnetometer in microtesla fields. Applied Physics Letters, 100(23), 文章 232405. https://doi.org/10.1063/1.4723842

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title = "Spin-spin relaxation of protons in ferrofluids characterized with a high-T c superconducting quantum interference device-detected magnetometer in microtesla fields",

abstract = "In this work, the spin-spin relaxation of protons in ferrofluids is characterized using a high-T c SQUID-based detector in microtesla fields. We found that spin-spin relaxation rate is enhanced in the presence of superparamagnetic nanoparticles. The enhanced relaxation rates are attributed to the microscopic field gradients from magnetic nanoparticles that dephase protons' spins nearby. The relaxation rates decrease when temperatures increase. Additionally, the alternating current magnetic susceptibility was inversely proportional to temperature. Those characteristics explained the enhanced Brownian motion of nanoparticles at high temperatures. Characterizing the relaxation will be helpful for assaying bio-molecules and magnetic resonance imaging in microtesla fields.",

author = "Liao, {Shu Hsien} and Liu, {Chieh Wen} and Yang, {Hong Chang} and Chen, {Hsin Hsien} and Chen, {Ming Jye} and Chen, {Kuen Lin} and Horng, {Herng Er} and Wang, {Li Min} and Yang, {Shieh Yueh}",

note = "Funding Information: This work is supported by National Science Council of Taiwan under Grant Nos. NSC100-2120-M-002-015 and NSC100-2112-M-003-011-MY2.",

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doi = "10.1063/1.4723842",

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AU - Liao, Shu Hsien

AU - Liu, Chieh Wen

AU - Yang, Hong Chang

AU - Chen, Hsin Hsien

AU - Chen, Ming Jye

AU - Chen, Kuen Lin

AU - Horng, Herng Er

AU - Wang, Li Min

AU - Yang, Shieh Yueh

N1 - Funding Information: This work is supported by National Science Council of Taiwan under Grant Nos. NSC100-2120-M-002-015 and NSC100-2112-M-003-011-MY2.

PY - 2012/6/4

Y1 - 2012/6/4

N2 - In this work, the spin-spin relaxation of protons in ferrofluids is characterized using a high-T c SQUID-based detector in microtesla fields. We found that spin-spin relaxation rate is enhanced in the presence of superparamagnetic nanoparticles. The enhanced relaxation rates are attributed to the microscopic field gradients from magnetic nanoparticles that dephase protons' spins nearby. The relaxation rates decrease when temperatures increase. Additionally, the alternating current magnetic susceptibility was inversely proportional to temperature. Those characteristics explained the enhanced Brownian motion of nanoparticles at high temperatures. Characterizing the relaxation will be helpful for assaying bio-molecules and magnetic resonance imaging in microtesla fields.

AB - In this work, the spin-spin relaxation of protons in ferrofluids is characterized using a high-T c SQUID-based detector in microtesla fields. We found that spin-spin relaxation rate is enhanced in the presence of superparamagnetic nanoparticles. The enhanced relaxation rates are attributed to the microscopic field gradients from magnetic nanoparticles that dephase protons' spins nearby. The relaxation rates decrease when temperatures increase. Additionally, the alternating current magnetic susceptibility was inversely proportional to temperature. Those characteristics explained the enhanced Brownian motion of nanoparticles at high temperatures. Characterizing the relaxation will be helpful for assaying bio-molecules and magnetic resonance imaging in microtesla fields.

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Spin-spin relaxation of protons in ferrofluids characterized with a high-T c superconducting quantum interference device-detected magnetometer in microtesla fields

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Spin-spin relaxation of protons in ferrofluids characterized with a high-T _c superconducting quantum interference device-detected magnetometer in microtesla fields