Study of magnetite nanoparticles embedded in lyotropic liquid crystals

被引：7

作者：

Arantes, F. R. ^{[1
]}

Figueiredo Neto, A. M. ^{[1
]}

Cornejo, D. R. ^{[1
]}

机构：

[1] Univ Sao Paulo, Inst Fis, BR-05508090 Sao Paulo, Brazil

来源：

12TH INTERNATIONAL CONFERENCE ON MAGNETIC FLUIDS ICMF12 | 2010年 / 9卷

关键词：

ferrofluids; ferrolyotropic; ferronematics; superparamagnetism; PHASE;

D O I：

10.1016/j.phpro.2010.11.002

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A study about the magnetic behaviour of magnetite nanoparticles diluted in lyotropic liquid crystals was carried out. It was corroborated that micellar phases of the liquid crystal suppressed the superparamagnetism of the nanoparticles by rising the blocking temperature beyond the room temperature. Phase transitions in the lyotropic mixtures can be determined from M vs. T curves of the ferrolyotropic. When the liquid crystal is in the nematic discotic phase, the magnetization and the susceptibility of the mixture mimics the behaviour of the orientational order parameter of the phase. (C) 2010 Published by Elsevier Ltd

引用

页码：2 / 5

页数：4

共 9 条

[1] Arantes F.R., 2010, THESIS U SAO PAULO
[2] Lyotropic ferronematics: Magnetic orientational transition in the discotic phase
Berejnov, V
Bacri, JC
Cabuil, V
Perzynski, R
Raikher, Y
[J]. EUROPHYSICS LETTERS, 1998, 41 (05): : 507 - 512
[3] THEORY OF MAGNETIC SUSPENSIONS IN LIQUID CRYSTALS
BROCHARD, F
GENNES, PGD
[J]. JOURNAL DE PHYSIQUE, 1970, 31 (07): : 691 - &
[4] OBSERVATION OF MACROSCOPIC COLLECTIVE BEHAVIOR AND NEW TEXTURE IN MAGNETICALLY DOPED LIQUID-CRYSTALS
CHEN, SH
AMER, NM
[J]. PHYSICAL REVIEW LETTERS, 1983, 51 (25) : 2298 - 2301
[5] ORIENTATIONAL ORDER PARAMETER AND SHAPE ANISOTROPY OF THE MICELLES IN A LYOTROPIC NEMATIC PHASE
GALERNE, Y
NETO, AMF
LIEBERT, L
[J]. PHYSICAL REVIEW A, 1985, 31 (06): : 4047 - 4048
[6] Nature of ferronematic alignment in a magnetic field
Morozov, KI
[J]. PHYSICAL REVIEW E, 2002, 66 (01) : 1 - 011704
[7] DETERMINATION OF THE MINIMUM CONCENTRATION OF FERROFLUID REQUIRED TO ORIENT NEMATIC LIQUID-CRYSTALS
NETO, AMF
SABA, MMF
[J]. PHYSICAL REVIEW A, 1986, 34 (04): : 3483 - 3485
[8] NETO AMF, 1985, J PHYS LETT-PARIS, V46, pL499, DOI 10.1051/jphyslet:019850046011049900
[9] Magnetic and magnetorheological characterization of a polymer liquid crystal ferronematic
Santiago-Quinones, Darlene I.
Acevedo, Aldo
Rinaldi, Carlos
[J]. JOURNAL OF APPLIED PHYSICS, 2009, 105 (07)

← 1 →