Effects of Varying Sufactant Chain Lenghts on the Magnetic, Optical and Hyperthermia Properties of Ferrofluids

Corneliu Rablau; Prem Vaishnava; Rajesh Regmi; Chandran Sudakar; Correy Black; Gavin Lawes; Ratna Naik; Melissa Lavoie; David Kahn

Effects of Varying Sufactant Chain Lenghts on the Magnetic, Optical and Hyperthermia Properties of Ferrofluids

Corneliu Rablau, Prem Vaishnava, Rajesh Regmi, Chandran Sudakar, Correy Black, Gavin Lawes, Ratna Naik, Melissa Lavoie, David Kahn

Kettering University

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Abstract

We report studies of the structural, magnetic, magneto-thermal and magneto-optic properties of dextran, oleic acid, lauric acid and myristic acid surfacted Fe3O4 nanoparticles of hydrodynamic sizes ranging from 32 nm to 92 nm. All the samples showed saturation magnetization of ̃50 emu/g, significantly smaller than the bulk value for Fe3O4, together with superparamagnetic behavior. The ac magnetization measurements on the dextran coated nanoparticles showed frequency dependent blocking temperature, consistent with superparamgnetic blocking. The ferrofluid heating rates in a 250 Gauss, 100 kHz ac magnetic field varied with the chain lengths of the surfactants, with higher heating rates for longer chains. DC-magnetic-field-induced light scattering patterns produced by two orthogonal He-Ne laser beams passing through the ferrofluid sample revealed different optical signatures for different surfactants.

Original language	American English
State	Published - Mar 16 2009
Event	2009 APS March Meeting - Duration: Mar 16 2009 → …

Conference

Conference	2009 APS March Meeting
Period	3/16/09 → …

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Physics

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Effects of Varying Sufactant Chain Lenghts on the Magnetic OpticFinal published version, 102 KBLicense: CC BY

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title = "Effects of Varying Sufactant Chain Lenghts on the Magnetic, Optical and Hyperthermia Properties of Ferrofluids",

abstract = " We report studies of the structural, magnetic, magneto-thermal and magneto-optic properties of dextran, oleic acid, lauric acid and myristic acid surfacted Fe3O4 nanoparticles of hydrodynamic sizes ranging from 32 nm to 92 nm. All the samples showed saturation magnetization of{\~ }50 emu/g, significantly smaller than the bulk value for Fe3O4, together with superparamagnetic behavior. The ac magnetization measurements on the dextran coated nanoparticles showed frequency dependent blocking temperature, consistent with superparamgnetic blocking. The ferrofluid heating rates in a 250 Gauss, 100 kHz ac magnetic field varied with the chain lengths of the surfactants, with higher heating rates for longer chains. DC-magnetic-field-induced light scattering patterns produced by two orthogonal He-Ne laser beams passing through the ferrofluid sample revealed different optical signatures for different surfactants.",

author = "Corneliu Rablau and Prem Vaishnava and Rajesh Regmi and Chandran Sudakar and Correy Black and Gavin Lawes and Ratna Naik and Melissa Lavoie and David Kahn",

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T1 - Effects of Varying Sufactant Chain Lenghts on the Magnetic, Optical and Hyperthermia Properties of Ferrofluids

AU - Rablau, Corneliu

AU - Vaishnava, Prem

AU - Regmi, Rajesh

AU - Sudakar, Chandran

AU - Black, Correy

AU - Lawes, Gavin

AU - Naik, Ratna

AU - Lavoie, Melissa

AU - Kahn, David

PY - 2009/3/16

Y1 - 2009/3/16

N2 - We report studies of the structural, magnetic, magneto-thermal and magneto-optic properties of dextran, oleic acid, lauric acid and myristic acid surfacted Fe3O4 nanoparticles of hydrodynamic sizes ranging from 32 nm to 92 nm. All the samples showed saturation magnetization of ̃50 emu/g, significantly smaller than the bulk value for Fe3O4, together with superparamagnetic behavior. The ac magnetization measurements on the dextran coated nanoparticles showed frequency dependent blocking temperature, consistent with superparamgnetic blocking. The ferrofluid heating rates in a 250 Gauss, 100 kHz ac magnetic field varied with the chain lengths of the surfactants, with higher heating rates for longer chains. DC-magnetic-field-induced light scattering patterns produced by two orthogonal He-Ne laser beams passing through the ferrofluid sample revealed different optical signatures for different surfactants.

AB - We report studies of the structural, magnetic, magneto-thermal and magneto-optic properties of dextran, oleic acid, lauric acid and myristic acid surfacted Fe3O4 nanoparticles of hydrodynamic sizes ranging from 32 nm to 92 nm. All the samples showed saturation magnetization of ̃50 emu/g, significantly smaller than the bulk value for Fe3O4, together with superparamagnetic behavior. The ac magnetization measurements on the dextran coated nanoparticles showed frequency dependent blocking temperature, consistent with superparamgnetic blocking. The ferrofluid heating rates in a 250 Gauss, 100 kHz ac magnetic field varied with the chain lengths of the surfactants, with higher heating rates for longer chains. DC-magnetic-field-induced light scattering patterns produced by two orthogonal He-Ne laser beams passing through the ferrofluid sample revealed different optical signatures for different surfactants.

UR - https://digitalcommons.kettering.edu/physics_conference/18

M3 - Presentation

T2 - 2009 APS March Meeting

Y2 - 16 March 2009

ER -

Effects of Varying Sufactant Chain Lenghts on the Magnetic, Optical and Hyperthermia Properties of Ferrofluids

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