Field-induced flocculation on biocompatible magnetic colloids

被引：9

作者：

Cintra, E. R. ^{[1
]}

Santos, J. L., Jr. ^{[1
]}

Socolovsky, L. M. ^{[1
]}

Buske, N. ^{[2
]}

Bakuzis, A. F. ^{[1
]}

机构：

[1] Univ Fed Goias, Inst Fis, BR-74001970 Goiania, Go, Brazil

[2] MagneticFluids, D-12346 Berlin, Germany

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2008年 / 320卷 / 14期

关键词：

magnetic liquid; fine particle system; magneto-optical effect;

D O I：

10.1016/j.jmmm.2008.02.087

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Field dependence of the optical transmission of a polyaspartic-coated magnetite magnetic fluid dispersed in water was investigated at different particle volume fractions. The particle size distribution of the sample was obtained from the analysis of the transmission electron microscopy pictures. The transmissivity decreased increasing the magnetic field until a critical field is achieved. Above this value, the opposite effect was observed. Indeed, the critical field decreases the higher the particle volume fraction being in qualitative similarity with phase separation behavior. However, the origin of the effect is attributed to the precipitation of field-induced nanoparticle chains. These phenomena might be useful on obtaining one-dimensional nanoparticle arrangements. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：E351 / E353

页数：3

共 20 条

[11]

LANDAU LD, 1960, ELECTRODYNAMICS CONT, P74105

[12] Toward the emergence of nanoneurosurgery: Part III - Nanomedicine: Targeted nanotherapy, nanosurgery, and progress toward the realization of nanoneurosurgery [J].

Leary, Scott P. ;

Liu, Charles Y. ;

Apuzzo, Michael L. J. .

NEUROSURGERY, 2006, 58 (06) :1009-1025

[13] Evidence of phase separation in magnetic colloids using magnetic resonance [J].

Neto, KS ;

Bakuzis, AF ;

Gonçalves, GRR ;

Pelegrini, F ;

Morais, PC .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2005, 289 :129-132

[14]

ROSENSWEIG RE, 1997, FERROHYDRODYNAMICS, P74105

[15] ORIGIN OF MAGNETIC BIREFRINGENCE AND DICHROISM IN MAGNETIC FLUIDS [J].

SCHOLTEN, PC .

IEEE TRANSACTIONS ON MAGNETICS, 1980, 16 (02) :221-225

[16] Beating the superparamagnetic limit with exchange bias [J].

Skumryev, V ;

Stoyanov, S ;

Zhang, Y ;

Hadjipanayis, G ;

Givord, D ;

Nogués, J .

NATURE, 2003, 423 (6942) :850-853

[17] Agglomerate formation in moderately concentrated ferrofluids from static magneto-optical measurements [J].

Socoliuc, V ;

Rasa, M ;

Sofonea, V ;

Bica, D ;

Osvath, L ;

Luca, D .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1999, 191 (1-2) :241-248

[18] MAGNETOOPTICAL EFFECTS OF MAGNETIC FLUID [J].

TAKETOMI, S ;

UKITA, M ;

MIZUKAMI, M ;

MIYAJIMA, H ;

CHIKAZUMI, S .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1987, 56 (09) :3362-3374

[19] Origin of field-dependent optical transmission of magnetic fluid films [J].

Yang, SY ;

Chiu, YP ;

Jeang, BY ;

Horng, HE ;

Hong, CY ;

Yang, HC .

APPLIED PHYSICS LETTERS, 2001, 79 (15) :2372-2374

[20] Condensation phase transitions in bidisperse colloids [J].

Zubarev, AY ;

Iskakova, LY .

PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS, 2005, 349 (1-2) :1-10

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