Use este identificador para citar ou linkar para este item: http://repositorio.bc.ufg.br/handle/ri/15250
Tipo do documento: Artigo
Título: Field-induced columnar transition of biocompatible magnetic colloids: an aging study by magnetotransmissivity
Autor: Elói, Marcos Tiago de Amaral e
Santos Júnior, Juracy Leandro dos
Morais, Paulo César de
Bakuzis, Andris Figueiroa
Abstract: The field dependence of the optical transmission of tartrate-coated and polyaspartate-coated magnetite-based aqueous colloids was studied. The colloidal stock samples were diluted to prepare a series of samples containing different particle volume fractions ranging from 0.17% up to 1.52% and measured at distinct times after preparation 1, 30, 120, 240, and 1460 days . We show that the magneto-transmissivity behavior is mainly described by the rotation of linear chains, at the low-field range, whereas the analysis of the data provided the measurement of the average chain length. Results also reveal that the optical transmissivity has a minimum at a particular critical field, whose origin is related to the onset of columns of chains built from isolated particle chains, i.e., due to a columnar phase transition. We found the critical field reducing as the particle volume fraction increases and as the sample’s aging time increases. To investigate the origin of this phenomenon we used phase condensation models and Mie’s theory applied to a chain of spheres and to an infinite cylinder. Possible implications for magnetophotonic colloidal-based devices and biomedical applications were discussed.
País: Estados unidos
Unidade acadêmica: Instituto de Física - IF (RG)
Citação: ELOI, M. T. A.; SANTOS JR., J. L.; MORAIS, P. C.; BAKUZIS, A. F. Field-induced columnar transition of biocompatible magnetic colloids: an aging study by magnetotransmissivity. Physical Review. E, Melville, v. 82, n. 2, e021407, 2010.
Tipo de acesso: Acesso Aberto
Identificador do documento: 10.1103/PhysRevE.82.021407
Identificador do documento: 10.1103/PhysRevE.82.021407
URI: http://repositorio.bc.ufg.br/handle/ri/15250
Data de publicação: 2010
Aparece nas coleções:IF - Artigos publicados em periódicos

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