Thermal conductivity of bulk boron nitride nanotube sheets and their epoxy‐impregnated composites

Jakubinek, Michael B.; Niven, John; Johnson, Michel B.; Ashrafi, Behnam; Kh, Kim; Simard, Benoît; White, Mary Anne

doi:10.1002/pssa.201533010

Cited by 39 publications

(33 citation statements)

References 30 publications

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“…to oxidize amorphous boron to B 2 O 3 27,37,[70][71][72] . The optimal oxidation temperature was chosen based on the TGA results in Figure 2e-g, and the exposure time was fixed to 6 h to remove amorphous boron.…”

Section: Resultsmentioning

confidence: 99%

Single- and double-walled boron nitride nanotubes: Controlled synthesis and application for water purification

Cho

Kim

Hwang

et al. 2020

Sci Rep

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Research interest in boron nitride nanotubes (Bnnts) has increased after the recent success of largescale Bnnt syntheses using high-temperature-pressure laser ablation or high-temperature plasma methods. Nonetheless, there are limits to the application and commercialization of these materials because of the difficulties associated with their fine structural control. Herein, the growth kinetics of Bnnts were systemically studied for this purpose. the growth pressure of the nitrogen feed gas was varied while the growth temperature remained constant, which was confirmed by black body radiation measurements and calculations based on a heat loss model. Changing from the diffusion-limited regime to the supply-limited regime of growth kinetics based on the optimized BNNT synthesis condition afforded the control of the number of BNNT walls. The total amount of BNNTs possessing single and double walls was over 70%, and the BNNT surface area increased to 278.2 m 2 /g corresponding to small wall numbers and diameters. taking advantage of the large surface area and high-temperature durability of the material, BNNTs utilized as a recyclable adsorbent for water purification. The efficiency of the BNNTs for capturing methylene blue particles in water was approximately 94%, even after three repetition cycles, showing the potential of the material for application in the filter industry.

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Section: Resultsmentioning

confidence: 99%

Single- and double-walled boron nitride nanotubes: Controlled synthesis and application for water purification

Cho

Kim

Hwang

et al. 2020

Sci Rep

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show abstract

“…Material degradation of BNNT materials has been observed as a function of beam current, due to elevated temperature in the target. Bulk BNNT material has low effective thermal conductivity of roughly 1 W/m 2 -K [20], and significant thermal oxidation has been observed for BNNT targets in the range of 800-900 • C [21]. A new target prototype is currently being designed that aims to reduce peak temperature in the BNNT by utilizing a grazing angle for the beam with only a thin layer of BNNT.…”

Section: Discussionmentioning

confidence: 99%

Boron Nitride Nanotube Cyclotron Targets for Recoil Escape Production of Carbon-11

et al. 2019

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Boron nitride nanotubes (BNNTs) were investigated as a target media for cyclotron production of 11 C for incident beam energy at or below 11 MeV. Both the 11 B(p,n) 11 C and 14 N(p,α) 11 C nuclear reactions were utilized. A sweep gas of nitrogen or helium was used to collect recoil escape atoms with a desired form of 11 CO 2 . Three prototype targets were tested using an RDS-111 cyclotron. Target geometry and density were shown to impact the saturation yield of 11 C and percent of yield recovered as carbon dioxide. Physical damage to the BNNT target media was observed at beam currents above 5 µA. Additional studies are needed to identify operating conditions suitable for commercial application of the method.

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“…Zhi et al successfully achieved more than 20-fold thermal conductivity improvement in BNNT-PMMA polymeric composite, while holding excellent electrical insulating properties [ 15 ]. Jakubinek et al performed the first direct measurement of thermal conductivity for pure BNNT-sheets [ 62 ]. A value of 1.5 Wm −1 K −1 was recorded for filtration-produced BNNT buckypaper, and it was 0.75 Wm −1 K −1 for low-density as-synthesized sheets.…”

Section: Bnnt Synthesis Methodsmentioning

confidence: 99%

Boron nitride nanotubes: synthesis and applications

et al. 2018

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Boron nitride nanotube (BNNT) has similar tubular nanostructure as carbon nanotube (CNT) in which boron and nitrogen atoms arranged in a hexagonal network. Owing to the unique atomic structure, BNNT has numerous excellent intrinsic properties such as superior mechanical strength , high thermal conductivity, electrically insulating behavior, piezoelectric property, neutron shielding capability, and oxidation resistance. Since BNNT was first synthesized in 1995, developing efficient BNNT production route has been a significant issue due to low yield and poor quality in comparison with CNT, thus limiting its practical uses. However, many great successes in BNNT synthesis have been achieved in recent years, enabling access to this material and paving the way for the development of promising applications. In this article, we discussed current progress in the production of boron nitride nanotube, focusing on the most common and effective methods that have been well established so far. In addition, we presented various applications of BNNT including polymer composite reinforcement, thermal management packages, piezo actuators, and neutron shielding nanomaterial.

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Thermal conductivity of bulk boron nitride nanotube sheets and their epoxy‐impregnated composites

Cited by 39 publications

References 30 publications

Single- and double-walled boron nitride nanotubes: Controlled synthesis and application for water purification

Single- and double-walled boron nitride nanotubes: Controlled synthesis and application for water purification

Boron Nitride Nanotube Cyclotron Targets for Recoil Escape Production of Carbon-11

Boron nitride nanotubes: synthesis and applications

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