Magnetic Orientation of Polymer Fibers in Suspension

Kimura, Tsunehisa; Yamato, Masafumi; Koshimizu, Wataru; Koike, and Minako; Kawai, Tadakazu

doi:10.1021/la990761j

Cited by 132 publications

(127 citation statements)

References 18 publications

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“…Then, 0.75 g of short CFs (K223HG, Mitsubishi Plastics, Inc. courtesy of Toyoda Gosei Co., Ltd.) was added and dispersed. The nominal anisotropic magnetic susceptibility, determined using the method proposed previously [7,8], was 0.75 T) that produced a magnetic field with radial distribution. The sol containing the CFs was allowed to cool down to room temperature to enable solidification.…”

Section: Methodsmentioning

confidence: 99%

“…Among them, carbon nanotubes (CNTs) and carbon fibers (CFs) have a large diamagnetic anisotropy owing to their graphene structures; the anisotropy causes a magnetic alignment. This nature of the materials is utilized to fabricate composites in which short CNTs [1][2][3][4] or CFs [5][6][7][8] are aligned in such a manner as to maximally utilize their excellent mechanical, thermal, and electronic properties [9].…”

Section: Introductionmentioning

confidence: 99%

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Fabrication of a short carbon fiber/gel composite that responds to a magnetic field

Kimura¹,

Umehara²,

Kimura³

2010

Carbon

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A short carbon fiber (CF)/agarose gel composite in which short CFs were radially embedded in the gel matrix was fabricated. The composite was subjected to strong magnetic fields up to 8 T, to observe its deformation. The composite deformed so that the carbon fibers were aligned parallel to the magnetic field. The deformation was analyzed quantitatively in terms of the magnetic and elastic energies of the composite.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fabrication of a short carbon fiber/gel composite that responds to a magnetic field

Kimura¹,

Umehara²,

Kimura³

2010

Carbon

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“…If  is far larger than a certain rate   (the intrinsic rate of magnetic response of a particle exposed to the static field of the intensity B) then the easy magnetization axis,  1 , cannot follow the rotation of the field. This condition is called "Rapid Rotation Regime (RRR)", defined as ||>>1/2, where  is expressed as  = 6 0 / a B 2 in the case that the particle shape is spherical (T. Kimura et al, 2000) where  a and  are magnetic anisotropy and the viscosity of the surrounding medium.…”

Section: Theoretical Background Of Preparation Of a 3d-momamentioning

confidence: 99%

Three-Dimensional Magnetically-Oriented Microcrystal Array: A Large Sample for Neutron Diffraction Analysis

Kimura¹,

Kimura²,

Matsumoto³

et al. 2012

Neutron Diffraction

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“…where 0 is the initial angle between the direction of the magnetic field and the magnetic easy axis of the crystal and S is the relaxation time for the crystal alignment under the static magnetic field 20) (hereafter, denotes the 'alignment time').…”

Section: Crystal Alignment Under Magnetic Fieldmentioning

confidence: 99%

Analysis of Uniaxial Alignment Behavior of Nonmagnetic Materials under Static Magnetic Field with Sample Rotation

et al. 2008

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A high magnetic field is a useful tool to control the crystal alignment of nonmagnetic materials such as metals, ceramics and polymers. However, the uniaxial alignment of hexagonal crystals with a magnetic susceptibility of c < a cannot be achieved under a static magnetic field, because the c-axis could lie along any arbitrary direction in the plane perpendicular to the direction of the magnetic field. For the uniaxial alignment of these materials, the imposition of a rotating magnetic field during a slip casting process has been proposed.In this study, both theoretical analysis and model experiment have been conducted for the elucidation of the crystal alignment phenomena under a rotating magnetic field and for the quantitative clarification of the optimum operating parameters such as magnetic field strength and viscosity of the medium surrounding the crystals. It has been found that the alignment time decreased with the magnetic field strength and/or with an increase in the viscosity of the surrounding medium. This relation is in contrary to the case of the crystal alignment under the static magnetic field. The result of the model experiment agrees well with that obtained by the theoretical analysis.

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Magnetic Orientation of Polymer Fibers in Suspension

Cited by 132 publications

References 18 publications

Fabrication of a short carbon fiber/gel composite that responds to a magnetic field

Fabrication of a short carbon fiber/gel composite that responds to a magnetic field

Three-Dimensional Magnetically-Oriented Microcrystal Array: A Large Sample for Neutron Diffraction Analysis

Analysis of Uniaxial Alignment Behavior of Nonmagnetic Materials under Static Magnetic Field with Sample Rotation

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