Aligning vapor-grown carbon fibers in polydimethylsiloxane using dc electric or magnetic field

Takahashi, Tatsuhiro; Murayama, Taichi; Higuchi, Ayumu; Asanuma, Hiroshi; Yonetake, Koichiro

doi:10.1016/j.carbon.2005.10.055

Cited by 80 publications

(38 citation statements)

References 19 publications

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“…The alignment process of Ni particles in the prepolymer was in-situ observed by a transmission optical microscope (TOM, Leica DM4000M, Germany). Additionally, the cured samples were placed into liquid nitrogen and then fractured along the alignment direction; the broken surfaces were observed by a scanning electron microscope (SEM, Hitachi S-4800, Japan [25] found in the vapor-grown carbon fiber/silicone oil systems the fiber alignment and the subsequent network formation was almost proportional to the matrix viscosity, because the high viscosity can effectively impede the fiber rotation and movement under dc electric field. In the present work, the rheological behavior of the Ni/RTV mixture was measured and shown in Figure 4.…”

Section: Methodsmentioning

confidence: 99%

Mechanical properties of silicone composites reinforced with micron- and nano-sized magnetic particles

Song¹,

Peng²,

Yue³

et al. 2013

Express Polym. Lett.

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Abstract. Silicone composites filled with different-sized nickel particles were prepared. By applying a permanent magnet, both the micron-and nano-sized particles were found to distribute along the magnetic field direction, resulting in chain-like microstructures, which improved the key mechanical properties of the resultant samples effectively, compared to the samples with randomly-distributed particles. The composites were also tested under various magnetic field strengths. The samples with aligned particles showed larger improvements in shear storage modulus than those with random particles.

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Section: Methodsmentioning

confidence: 99%

Mechanical properties of silicone composites reinforced with micron- and nano-sized magnetic particles

Song¹,

Peng²,

Yue³

et al. 2013

Express Polym. Lett.

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“…Thus, alignment of short carbon fiber is of great importance, e.g., carbon nanotubes (CNTs) have the same anisotropic properties and have been widely investigated in composite study [8,9]. There have been different processes documented in literature in order to align short fibers (or CNTs), e.g., magnetic field [10][11][12][13], gas flow [14,15], shear flow [2,[16][17][18], mechanical shear press [2,19,20], mechanical stretch [21], and electrical field [22][23][24][25][26][27][28]. While mechanical methods of alignment allow production of large size samples, it is still costly and has specific requirements for sample preparation [22].…”

Section: Introductionmentioning

confidence: 99%

Pearl-Chain Formation of Discontinuous Carbon Fiber under an Electrical Field

Daniel

Yang

et al. 2017

JMMP

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Abstract:The purpose of this paper is to develop a theoretical derivation on aligning discontinuous carbon fiber with an applied electric field, and prove the theory with experiment. A principle with regard to the occurrence of carbon fiber alignment is presented after an introduction of the electromechanical quantities of dielectrics. Based on this principle, an estimation of the polarizability tensor is employed to calculate the required electric field to achieve fiber alignment in liquid solution (e.g., water, resin, etc.). Individual carbon fiber is modeled as a polarizable dielectric cylinder in liquid resin and its motion under direct current (DC) electrical field is decomposed into a polarization effect and rotation effect. A value of 20.12 V/mm is required to align short carbon fibers (0.15 mm) long in liquid resin and is experimentally validated. Finally, an expression to include weight percentage as a means of controlling pearl-chain formation is derived to change the composite's electrical conductivity.

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“…VDP and selfassembly alter the interactions between fillers by controlling their electrical or chemical properties, whereas the honeycomb-like technique uses polymer balls as a matrix to facilitate the physical separation of domains between the polymer and inorganic boron nitride (BN) fillers prior to thermal treatment. 10) Electric fields, 12) shear forces 13) and magnetic fields 14) have been applied as external torque sources for the anisotropic orientation of nanofillers.…”

Section: Introductionmentioning

confidence: 99%

Texture-controlled hybrid materials fabricated using nanosecond technology

Cho

Nakayama

Huynh

et al. 2016

J. Ceram. Soc. Japan

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The controlled assembly of micro-and nano-ceramic fillers in polymer nanocomposites provides robust properties such as wetting, adhesion, thermal conductivity, electrical insulation and optical activity, and enable the extended application of these hybrid materials as thermal interfacing materials in microelectronics and for energy conversion. However, the required properties can only be obtained either by homogeneous mixing or by anisotropic orientation of a large amount (>50 vol.%) of expensive fillers, which is economically inefficient. Here we propose a strategy for tuning the orientation and assembly of ceramic boron nitride nanofillers in a polymer nanocomposite using a small amount (<5 vol.%) of filler to enhance thermal conduction. The texture of the BN fillers is tuned by application of a nanosecond pulse electric field and a superconductor magnetic field (10 T); the three-dimensional structure of the products was analyzed using 3-D X-ray CT scanning. The enhanced anisotropic orientation and thermal properties of the products were assessed as a function of the structural variation of the boron nitride fillers in the polymer.

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Aligning vapor-grown carbon fibers in polydimethylsiloxane using dc electric or magnetic field

Cited by 80 publications

References 19 publications

Mechanical properties of silicone composites reinforced with micron- and nano-sized magnetic particles

Mechanical properties of silicone composites reinforced with micron- and nano-sized magnetic particles

Pearl-Chain Formation of Discontinuous Carbon Fiber under an Electrical Field

Texture-controlled hybrid materials fabricated using nanosecond technology

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