Epoxy resin-based nanocomposite films with highly oriented BN nanosheets prepared using a nanosecond-pulse electric field

Cho, Hong‐Baek; Tu, Nguyen Chung; Fujihara, Takeshi; Endo, Shin; Suzuki, Tsuneo; Tanaka, Satoshi; Jiang, Weihua; Suematsu, Hisayuki; Niihara, Koichi; Nakayama, Tadachika

doi:10.1016/j.matlet.2011.05.005

Cited by 34 publications

(13 citation statements)

References 18 publications

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“…19 The nanosheets align themselves parallel to the electric field to minimize the electrostatic energy and overcome the free energy of the system. 21 Therefore, the use of microscopic molds is useful to induce the localization of BN nanosheets inside the protrusions of the molds perpendicular to the film plane and prevent the nanosheets from tilt orientation, which is typically observed during field-induced orientation of dielectric fillers in a polymer matrix. The perpendicular orientation of this type of nanosheet is represented by an increase of the XRD peak intensity; however, excessive localization of BN nanosheets is considered to affect the tilt orientation of BN nanosheets that were originally aligned perpendicular to the film plane, which results in a decreased XRD intensity ratio.…”

Section: Discussionmentioning

confidence: 99%

“…The perpendicular orientation of this type of nanosheet is represented by an increase of the XRD peak intensity; however, excessive localization of BN nanosheets is considered to affect the tilt orientation of BN nanosheets that were originally aligned perpendicular to the film plane, which results in a decreased XRD intensity ratio. 21 Therefore, the use of microscopic molds is useful to induce the localization of BN nanosheets inside the protrusions of the molds perpendicular to the film plane and prevent the nanosheets from tilt orientation, which is typically observed during field-induced orientation of dielectric fillers in a polymer matrix. This would help to maintain the highest XRD intensity ratio of BN nanosheets in the composite film.…”

Section: Discussionmentioning

confidence: 99%

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Field‐Induced Orientation of Hexagonal Boron Nitride Nanosheets Using Microscopic Mold for Thermal Interface Materials

et al. 2011

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The orientation of hexagonal boron nitride (BN) nanosheets was controlled in polymer‐based nanocomposite film using microscopic molds while applying a dc electric field. The hexagonal BN nanosheets were dispersed by sonication in a prepolymer mixture of polysiloxane followed by high speed mixing. The homogeneous suspension was cast on a microscopic mold with different patterns, which was attached to a positive electrode during application of an electric field before it became cross‐linked. Analysis revealed that filament‐like linear assemblies of BN nanosheets (LABNs) were fabricated in polysiloxane/BN nanosheet composite films, and the LABNs were aligned perpendicular to the film plane with high anisotropy. The anisotropy of BN nanosheets and dimensions of LABNs were directly related with the thermal properties of the composite, and could be changed according to the type of microscopic mold used. LABN formation and the heat conduction mechanisms induced by the type of microscopic mold and the intensity of the applied electric fields are discussed.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Field‐Induced Orientation of Hexagonal Boron Nitride Nanosheets Using Microscopic Mold for Thermal Interface Materials

et al. 2011

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“…The experimental conditions are DC electric field of 100 V and nanosecond electric field of 3 kV in voltage, 50 Hz of repetition rate, 70 ns of pulse width. The technology of pulse generation and its application into fabrication of polymer-nanocomposites are described elsewhere [22]. Finally, the prepared composites were dried for 30 min at 80 • C to complete the curing.…”

Section: Methodsmentioning

confidence: 99%

Internal structure control of the TiO₂ nanotubes and polysiloxane nanocomposites by nanosecond pulsed electric field

Lee

Cho

Nakayama

et al. 2014

Journal of Asian Ceramic Societies

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A facile technique has been introduced for incorporating TiO 2 nanotubes (TNTs) in amorphous polysiloxane-based nanocomposite films and for linear and dense assembling of these TNTs (LATNTs) under application of nanosecond pulse electric field. The use of a nanosecond electrical pulse enables the application of high electric power without causing dielectric breakdown, which occurs when DC/AC electric field is used, and the formation of LATNTs which anchor the resulting composite film planes. The properties of the nanocomposites were investigated using X-ray micro CT scanning, digital micrographs, UV-vis spectroscopy and electrical resistivity measurements. More than 5.5-fold UV-vis transmittance improvement was obtained by the polymer composite containing LATNTs (TNT 5.0 wt%). Such a composite exhibited a decreased electric resistivity of 3.08 × 10 7 m compared to the case for randomly distributed TNTs (3.25 × 10 8 m).

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“…However, the intensity of the electric field that can be applied to the composite system is limited by electrical breakdown and burnout of the material caused by application of an electric field intensity higher than the breakdown voltage. 15) We recently reported that a nanosecond pulse electric field does not cause electrical breakdown, yet orients insulating BN nanosheets: 15), 16) electrical breakdown caused by application of 1 kV DC did not occur when up to a 40 kV nanosecond pulse electric field was applied. The anisotropic orientation of the BN nanosheets was demonstrated by activating the diamagnetic susceptibility of the c-axis of the BN using a high (10 T) magnetic field.…”

Section: Introductionmentioning

confidence: 98%

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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Epoxy resin-based nanocomposite films with highly oriented BN nanosheets prepared using a nanosecond-pulse electric field

Cited by 34 publications

References 18 publications

Field‐Induced Orientation of Hexagonal Boron Nitride Nanosheets Using Microscopic Mold for Thermal Interface Materials

Field‐Induced Orientation of Hexagonal Boron Nitride Nanosheets Using Microscopic Mold for Thermal Interface Materials

Internal structure control of the TiO₂ nanotubes and polysiloxane nanocomposites by nanosecond pulsed electric field

Texture-controlled hybrid materials fabricated using nanosecond technology

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Epoxy resin-based nanocomposite films with highly oriented BN nanosheets prepared using a nanosecond-pulse electric field

Cited by 34 publications

References 18 publications

Field‐Induced Orientation of Hexagonal Boron Nitride Nanosheets Using Microscopic Mold for Thermal Interface Materials

Field‐Induced Orientation of Hexagonal Boron Nitride Nanosheets Using Microscopic Mold for Thermal Interface Materials

Internal structure control of the TiO2 nanotubes and polysiloxane nanocomposites by nanosecond pulsed electric field

Texture-controlled hybrid materials fabricated using nanosecond technology

Contact Info

Product

Resources

About

Internal structure control of the TiO₂ nanotubes and polysiloxane nanocomposites by nanosecond pulsed electric field