Temperature and concentration-dependent relaxation of ferrofluids characterized with a high-T c SQUID-based nuclear magnetic resonance spectrometer

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

doi:10.1063/1.4718032

Temperature and concentration-dependent relaxation of ferrofluids characterized with a high-T _c SQUID-based nuclear magnetic resonance spectrometer

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

^*Corresponding author for this work

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

12 Citations (Scopus)

Abstract

We investigated the relaxation of protons in magnetic fluids using a high-T _c SQUID magnetometer. It was found that the longitudinal relaxation rate, 1/T ₁, is slower than the transverse relaxation rate, 1/T ₂, for ferrofluids in the same field. This is due to the fact that the 1/T ₁ process involves returning the magnetization to the z-direction, which automatically involves the loss of magnetization in the x-y plane governed by the 1/T ₂ process. Additionally, 1/T ₁ and 1/T ₂ at high temperatures are slower than the corresponding relaxation rates at low temperatures, which is due to the enhanced Brownian motion of nanoparticles at high temperatures.

Original language	English
Article number	202405
Journal	Applied Physics Letters
Volume	100
Issue number	20
DOIs	https://doi.org/10.1063/1.4718032
Publication status	Published - 2012 May 14

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.4718032

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title = "Temperature and concentration-dependent relaxation of ferrofluids characterized with a high-T c SQUID-based nuclear magnetic resonance spectrometer",

abstract = "We investigated the relaxation of protons in magnetic fluids using a high-T c SQUID magnetometer. It was found that the longitudinal relaxation rate, 1/T 1, is slower than the transverse relaxation rate, 1/T 2, for ferrofluids in the same field. This is due to the fact that the 1/T 1 process involves returning the magnetization to the z-direction, which automatically involves the loss of magnetization in the x-y plane governed by the 1/T 2 process. Additionally, 1/T 1 and 1/T 2 at high temperatures are slower than the corresponding relaxation rates at low temperatures, which is due to the enhanced Brownian motion of nanoparticles at high temperatures.",

author = "Yang, {Hong Chang} and Liu, {Chieh Wen} and Liao, {S. H.} and Chen, {Hsin Hsien} and Chen, {M. J.} and Chen, {K. L.} and Horng, {Herng Er} and Yang, {S. Y.} and Wang, {L. M.}",

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

year = "2012",

month = may,

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doi = "10.1063/1.4718032",

language = "English",

volume = "100",

journal = "Applied Physics Letters",

issn = "0003-6951",

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T1 - Temperature and concentration-dependent relaxation of ferrofluids characterized with a high-T c SQUID-based nuclear magnetic resonance spectrometer

AU - Yang, Hong Chang

AU - Liu, Chieh Wen

AU - Liao, S. H.

AU - Chen, Hsin Hsien

AU - Chen, M. J.

AU - Chen, K. L.

AU - Horng, Herng Er

AU - Yang, S. Y.

AU - Wang, L. M.

N1 - Funding Information: This work is supported by National Science Council of Taiwan under Grant NSC100-2120 -M-002-015.

PY - 2012/5/14

Y1 - 2012/5/14

N2 - We investigated the relaxation of protons in magnetic fluids using a high-T c SQUID magnetometer. It was found that the longitudinal relaxation rate, 1/T 1, is slower than the transverse relaxation rate, 1/T 2, for ferrofluids in the same field. This is due to the fact that the 1/T 1 process involves returning the magnetization to the z-direction, which automatically involves the loss of magnetization in the x-y plane governed by the 1/T 2 process. Additionally, 1/T 1 and 1/T 2 at high temperatures are slower than the corresponding relaxation rates at low temperatures, which is due to the enhanced Brownian motion of nanoparticles at high temperatures.

AB - We investigated the relaxation of protons in magnetic fluids using a high-T c SQUID magnetometer. It was found that the longitudinal relaxation rate, 1/T 1, is slower than the transverse relaxation rate, 1/T 2, for ferrofluids in the same field. This is due to the fact that the 1/T 1 process involves returning the magnetization to the z-direction, which automatically involves the loss of magnetization in the x-y plane governed by the 1/T 2 process. Additionally, 1/T 1 and 1/T 2 at high temperatures are slower than the corresponding relaxation rates at low temperatures, which is due to the enhanced Brownian motion of nanoparticles at high temperatures.

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DO - 10.1063/1.4718032

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JF - Applied Physics Letters

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ER -

Temperature and concentration-dependent relaxation of ferrofluids characterized with a high-T _c SQUID-based nuclear magnetic resonance spectrometer

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