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

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

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.

Original language	English
Article number	232405
Journal	Applied Physics Letters
Volume	100
Issue number	23
DOIs	https://doi.org/10.1063/1.4723842
Publication status	Published - 2012 Jun 4

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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@article{aa54bd3f41b8485d851e7a015001471b,

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 Hong-Chang Yang and Chen, {Hsin Hsien} and Chen, {Ming Jye} and Chen, {Kuen Lin} and Herng-Er Horng and Wang, {Li Min} and Shieh-Yueh Yang",

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.",

year = "2012",

month = jun,

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doi = "10.1063/1.4723842",

language = "English",

volume = "100",

journal = "Applied Physics Letters",

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T1 - Spin-spin relaxation of protons in ferrofluids characterized with a high-T c superconducting quantum interference device-detected magnetometer in microtesla fields

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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DO - 10.1063/1.4723842

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VL - 100

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JF - Applied Physics Letters

IS - 23

M1 - 232405

ER -

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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