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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Properties of nanoparticles prepared from NdFeB-based compound for magnetic hyperthermia application

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Author(s):
Perigo, E. A. [1] ; Silva, S. C. [2] ; de Sousa, E. M. B. [3] ; Freitas, A. A. [3] ; Cohen, R. [4] ; Nagamine, L. C. C. M. [4] ; Takiishi, H. [2] ; Landgraf, F. J. G. [1, 5]
Total Authors: 8
Affiliation:
[1] Inst Technol Res, Ctr Proc & Prod Technol, BR-05508901 Sao Paulo - Brazil
[2] Nucl & Energy Res Inst, Ctr Mat Sci & Technol, BR-05508000 Sao Paulo - Brazil
[3] Ctr Dev Nucl Technol, Nanotechnol Serv, BR-31270970 Belo Horizonte, MG - Brazil
[4] Univ Sao Paulo, Inst Phys, BR-05315970 Sao Paulo - Brazil
[5] Univ Sao Paulo, Polytech Sch, BR-05508030 Sao Paulo - Brazil
Total Affiliations: 5
Document type: Journal article
Source: Nanotechnology; v. 23, n. 17 MAY 4 2012.
Web of Science Citations: 10
Abstract

Nanoparticles were prepared from a NdFeB-based alloy using the hydrogen decrepitation process together with high-energy ball milling and tested as heating agent for magnetic hyperthermia. In the milling time range evaluated (up to 10 h), the magnetic moment per mass at H = 1.59 MA m(-1) is superior than 70 A m(2) kg(-1); however, the intrinsic coercivity might be inferior than 20 kA m(-1). The material presents both ferromagnetic and superparamagnetic particles constituted by a mixture of phases due to the incomplete disproportionation reaction of Nd2Fe14BHx during milling. Solutions prepared with deionized water and magnetic particles exposed to an AC magnetic field (H-max similar to 3.7 kA m(-1) and f = 228 kHz) exhibited 26 K <= Delta T-max <= 44 K with a maximum estimated specific absorption rate (SAR) of 225 W kg(-1). For the pure magnetic material milled for the longest period of time (10 h), the SAR was estimated as similar to 2500 W kg(-1). In vitro tests indicated that the powders have acceptable cytotoxicity over a wide range of concentration (0.1-100 mu g ml(-1)) due to the coating applied during milling. (AU)

FAPESP's process: 10/08018-8 - Reprocessing of commercial REFeB (RE = Nd or Pr) sintered magnets for preparation of bonded magnets and semi-hard magnetic compounds using hydrogen
Grantee:Élio Alberto Périgo
Support type: Scholarships in Brazil - Post-Doctorate