Field-induced columnar transition of biocompatible magnetic colloids: an aging study by magnetotransmissivity

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dc.creatorElói, Marcos Tiago de Amaral e
dc.creatorSantos Júnior, Juracy Leandro dos
dc.creatorMorais, Paulo César de
dc.creatorBakuzis, Andris Figueiroa
dc.date.accessioned2018-06-14T11:27:23Z
dc.date.available2018-06-14T11:27:23Z
dc.date.issued2010
dc.description.abstractThe 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.pt_BR
dc.identifier.citationELOI, 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.pt_BR
dc.identifier.doi10.1103/PhysRevE.82.021407
dc.identifier.issne- 1550-2376
dc.identifier.urihttp://repositorio.bc.ufg.br/handle/ri/15250
dc.language.isoengpt_BR
dc.publisher.countryEstados unidospt_BR
dc.publisher.departmentInstituto de Física - IF (RG)pt_BR
dc.rightsAcesso Abertopt_BR
dc.titleField-induced columnar transition of biocompatible magnetic colloids: an aging study by magnetotransmissivitypt_BR
dc.typeArtigopt_BR

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