Crystallization and magnetic properties of 3D micrometer-scale simple-cubic maghemite superlattices

Chih Jung Chen; Ray Kuang Chiang; Yeau Ren Jeng

doi:10.1021/jp205635k

Crystallization and magnetic properties of 3D micrometer-scale simple-cubic maghemite superlattices

Chih Jung Chen, Ray Kuang Chiang, Yeau Ren Jeng

Department of Biomedical Engineering

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

27 Citations (Scopus)

Abstract

A reproducible method is proposed for the crystallization of three-dimensional (3D), micrometer-scale, simple-cubic superlattices (SCSLs) via the evaporation of a dispersion of 14.7 nm maghemite nanocubes in hexane. It is shown that the formation of the maghemite SCSLs is critically dependent on the presence of excess oleic acid (OA) in the nanocube dispersion. Specifically, the dynamic light-scattering results show that, given a relative concentration of approximately 15-20 vol %, the OA acts as a mild destabilization agent and prompts the homogeneous nucleation and growth of maghemite SCSLs. The magnetic properties of the SCSLs are investigated and compared with those of isolated maghemite nanocubes diluted in paraffin. It is shown that the coercivity force (Hc) and remanence ratio (M_r/M_s) of the 3D SCSLs at a temperature of 5 K are significantly lower than those of the isolated nanocubes at the same temperature. The magnetostatic energy-to-anisotropy energy (E _ms/E_K) ratio of the SCSLs is around 0.47. Thus, it is inferred that the reduction in the Hc and M_r/M_s properties of the SCSLs is the result primarily of assembling effects.

Original language	English
Pages (from-to)	18142-18148
Number of pages	7
Journal	Journal of Physical Chemistry C
Volume	115
Issue number	37
DOIs	https://doi.org/10.1021/jp205635k
Publication status	Published - 2011 Sept 22

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
General Energy
Physical and Theoretical Chemistry
Surfaces, Coatings and Films

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10.1021/jp205635k

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abstract = "A reproducible method is proposed for the crystallization of three-dimensional (3D), micrometer-scale, simple-cubic superlattices (SCSLs) via the evaporation of a dispersion of 14.7 nm maghemite nanocubes in hexane. It is shown that the formation of the maghemite SCSLs is critically dependent on the presence of excess oleic acid (OA) in the nanocube dispersion. Specifically, the dynamic light-scattering results show that, given a relative concentration of approximately 15-20 vol %, the OA acts as a mild destabilization agent and prompts the homogeneous nucleation and growth of maghemite SCSLs. The magnetic properties of the SCSLs are investigated and compared with those of isolated maghemite nanocubes diluted in paraffin. It is shown that the coercivity force (Hc) and remanence ratio (Mr/Ms) of the 3D SCSLs at a temperature of 5 K are significantly lower than those of the isolated nanocubes at the same temperature. The magnetostatic energy-to-anisotropy energy (E ms/EK) ratio of the SCSLs is around 0.47. Thus, it is inferred that the reduction in the Hc and Mr/Ms properties of the SCSLs is the result primarily of assembling effects.",

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AB - A reproducible method is proposed for the crystallization of three-dimensional (3D), micrometer-scale, simple-cubic superlattices (SCSLs) via the evaporation of a dispersion of 14.7 nm maghemite nanocubes in hexane. It is shown that the formation of the maghemite SCSLs is critically dependent on the presence of excess oleic acid (OA) in the nanocube dispersion. Specifically, the dynamic light-scattering results show that, given a relative concentration of approximately 15-20 vol %, the OA acts as a mild destabilization agent and prompts the homogeneous nucleation and growth of maghemite SCSLs. The magnetic properties of the SCSLs are investigated and compared with those of isolated maghemite nanocubes diluted in paraffin. It is shown that the coercivity force (Hc) and remanence ratio (Mr/Ms) of the 3D SCSLs at a temperature of 5 K are significantly lower than those of the isolated nanocubes at the same temperature. The magnetostatic energy-to-anisotropy energy (E ms/EK) ratio of the SCSLs is around 0.47. Thus, it is inferred that the reduction in the Hc and Mr/Ms properties of the SCSLs is the result primarily of assembling effects.

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Crystallization and magnetic properties of 3D micrometer-scale simple-cubic maghemite superlattices

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