Highly thermally conductive and electrically insulating polymer nanocomposites with boron nitride nanosheet/ionic liquid complexes

Morishita, Takuya; Takahashi, Naoko

doi:10.1039/c7ra06691k

Cited by 46 publications

(25 citation statements)

References 59 publications

(63 reference statements)

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“…The in‐plane orientation anisotropy of CNs was studied by 2D XRD (Bruker D8 Discover) and polarization effect (Zeiss cross‐polarized microscope Axio Scope A1). The thermal diffusivities were measured by Bethel TA3, which has been widely used for evaluating the in‐plane anisotropic K . K // and K ⊥ at 35 °C were calculated based on the thermal diffusivity, specific heat (tested by TA DSC‐Q20), and mass density.…”

Section: Methodsmentioning

confidence: 99%

Breathable Nanowood Biofilms as Guiding Layer for Green On‐Skin Electronics

Zhou

Wang

Huang

et al. 2019

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thermoelectric [3,4] and moisture-inducedelectric [5] effects also has gained great attention (skin and on-skin electronics (On-skinE) themselves are energy storehouse). However, several challenges are to be faced, "thin-film" On-skinE I) cannot install "bulky" heatsinks [6] or sweat transport channels, but the output power of the thermoelectric generator and moistureinduced-electric generator depends on the temperature difference (∆T) across generator [4] and the ambient humidity (AH), [5] respectively; II) also lack a routing and accumulation of sweat for biosensing technologies, [7,8] and lack a targeted delivery of drugs for precise feedback transdermal therapy technologies; [9,10] and III) need insulate between the heatgenerating unit and heat-sensitive unit.In these regards, a "routing and accumulation" of heat and sweat can "concurrently" enhance the ∆T/AH-dependent output power, enable a reliable sweatbased biosensing, and prove the ability of targeted delivery of saline-soluble drugs for precise feedback transdermal therapy. Therefore, it is in great demand for developing strong-guiding films, which can help insulate between units and guide the heat and sweat to another in-plane direction.Besides, breathability [3] and stretchability [11] are essential for the on-skin use of electronics with long-term comfort. Several strategies have been proposed to realize the "stretchability" and the strategy placing rigid electronic units on the Thin-film electronics are urged to be directly laminated onto human skin for reliable, sensitive biosensing together with feedback transdermal therapy, their self-power supply using the thermoelectric and moisture-induced-electric effects also has gained great attention (skin and on-skin electronics (On-skinE) themselves are energy storehouses). However, "thin-film" On-skinE 1) cannot install "bulky" heatsinks or sweat transport channels, but the output power of thermoelectric generator and moisture-induced-electric generator relies on the temperature difference (∆T ) across generator and the ambient humidity (AH), respectively; 2) lack a routing and accumulation of sweat for biosensing, lack targeted delivery of drugs for precise transdermal therapy; and 3) need insulation between the heat-generating unit and heat-sensitive unit. Here, two breathable nanowood biofilms are demonstrated, which can help insulate between units and guide the heat and sweat to another in-plane direction. The transparent biofilms achieve record-high transport // /transport ⊥ (//: along cellulose nanofiber alignment direction, ⊥: perpendicular direction) of heat (925%) and sweat (338%), winning applications emphasizing on ∆T/AH-dependent output power and "reliable" biosensing. The porous biofilms are competent in applications where "sensitive" biosensing (transporting // sweat up to 11.25 mm s −1 at the 1st second), "insulating" between units, and "targeted" delivery of saline-soluble drugs are of uppermost priority.

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Section: Methodsmentioning

confidence: 99%

Breathable Nanowood Biofilms as Guiding Layer for Green On‐Skin Electronics

Zhou

Wang

Huang

et al. 2019

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“…On the other hand, despite being a structural isomorph of graphene consisting of boron and nitrogen atoms in an analogous honeycomb structure, hexagonal boron nitride (hBN) is electrically insulating, which makes it an appealing dielectric for electronic applications . In addition, hBN has excellent mechanical robustness and high thermal conductivity, which has been utilized to enhance heat transport in composite materials and nanofluids …”

Section: Introductionmentioning

confidence: 99%

Ion‐Conductive, Viscosity‐Tunable Hexagonal Boron Nitride Nanosheet Inks

Moraes

Hyun

Seo

et al. 2019

Adv Funct Materials

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Liquid-phase exfoliation of layered solids holds promise for the scalable production of 2D nanosheets. When combined with suitable solvents and stabilizing polymers, the rheology of the resulting nanosheet dispersions can be tuned for a variety of additive manufacturing methods. While significant progress is made in the development of electrically conductive nanosheet inks, minimal effort is applied to ion-conductive nanosheet inks despite their central role in energy storage applications. Here, the formulation of viscosity-tunable hexagonal boron nitride (hBN) inks compatible with a wide range of printing methods that span the spectrum from low-viscosity inkjet printing to high-viscosity blade coating is demonstrated. The inks are prepared by liquid-phase exfoliation with ethyl cellulose as the polymer dispersant and stabilizer. Thermal annealing of the printed structures volatilizes the polymer, resulting in a porous microstructure and the formation of a nanoscale carbonaceous coating on the hBN nanosheets, which promotes high wettability to battery electrolytes. The final result is a printed hBN nanosheet film that possesses high ionic conductivity, chemical and thermal stability, and electrically insulating character, which are ideal characteristics for printable battery components such as separators. Indeed, lithium-ion battery cells based on printed hBN separators reveal enhanced electrochemical performance that exceeds commercial polymer separators.

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“…However, grafting is hard to control in industrial practice. Herein an ionic liquid, 1‐ethyl‐3‐methylimidazolium tetrafluoroborate, is introduced into PMMA/silica nanocomposites by blending considering its good compatibility with PMMA and silica . This simple method yields nanocomposites exhibiting improved reinforcement and thermal stability.…”

Section: Introductionmentioning

confidence: 99%

“…Herein an ionic liquid, 1-ethyl-3-methylimidazolium tetrafluoroborate, is introduced into PMMA/silica nanocomposites by blending considering its good compatibility with PMMA and silica. 8,10,31,32 This simple method yields nanocomposites exhibiting improved reinforcement and thermal stability. In order to understand the underling mechanisms, the morphology and rheological and thermal behaviors of the nanocomposites are comprehensively investigated.…”

Section: Introductionmentioning

confidence: 99%

Influence of ionic liquid on glass transition, dynamic rheology, and thermal stability of poly(methyl methacrylate)/silica nanocomposites

Zheng

et al. 2019

J of Applied Polymer Sci

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The nanofiller dispersion greatly influences the properties of nanocomposites. Herein an ionic liquid, 1‐ethyl‐3‐methylimidazolium tetrafluoroborate, is introduced in poly(methyl methacrylate) (PMMA) nanocomposites for mediating dispersion of silica filler. As elucidated by rheology, the ionic liquid is able to improve the degree of retardation of chains diffusion induced by silica although it eliminates the elevation of glass transition. Simultaneously, the ionic liquid incorporated can improve thermal and thermal‐oxidative stability of PMMA due to trapping of radicals and blocking oxygen penetration. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 48007.

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Highly thermally conductive and electrically insulating polymer nanocomposites with boron nitride nanosheet/ionic liquid complexes

Cited by 46 publications

References 59 publications

Breathable Nanowood Biofilms as Guiding Layer for Green On‐Skin Electronics

Breathable Nanowood Biofilms as Guiding Layer for Green On‐Skin Electronics

Ion‐Conductive, Viscosity‐Tunable Hexagonal Boron Nitride Nanosheet Inks

Influence of ionic liquid on glass transition, dynamic rheology, and thermal stability of poly(methyl methacrylate)/silica nanocomposites

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