Thermally conductive composites based on hexagonal boron nitride nanosheets for thermal management: Fundamentals to applications

Wu, Wentong; Zheng, Ming‐Sheng; Lu, Kaibo; Liu, Feng; Song, Yanhui; Liu, Maochang; Dang, Zhi‐Min

doi:10.1016/j.compositesa.2023.107533

Cited by 45 publications

(13 citation statements)

References 200 publications

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“…Until now, the primary approach to enhancing the stability of sensors has involved encapsulating the sensing layer with packaging materials such as poly(dimethylsiloxane) and Ecoflex. − Despite significant advancements, the enhancement in comprehensive properties, including mechanical stretchability and sensing performance, remains suboptimal due to the mismatched Young’s modulus between the flexible substrate and encapsulation layer. , Additionally, most of the above-mentioned polymer packaging materials suffer from a low intrinsic thermal conductivity, making it difficult to meet the high thermal dissipation demands of flexible electronics. Over the past decade, substantial effort has been devoted to enhancing the thermal conductivity of polymers by incorporating highly thermally conductive and electric insulating fillers. − Among these fillers, boron nitride nanosheets (BNNSs) with wide band gap (∼5.9 eV), high aspect ratio, and distinguished theoretical thermal conductivity have emerged as leading candidates for fabricating thermally dissipative composites. − Particularly, the high orientation and strong van der Waals interactions between the polymer and BNNS are beneficial to constructing effective thermally conductive pathways and reducing phonon scattering among the interacting units, hence greatly enhancing the thermal conductivity at low filler percolation thresholds. − In this regard, the strategic design of both electrical and thermal conduction channels based on electrospinning polymer/MXene films and polymer/BNNS composites is expected to enhance the sensing performance and realize rapid heat dissipation in flexible strain sensors.…”

Section: Introductionmentioning

confidence: 99%

Sandwich-Like Flexible Breathable Strain Sensor with Tunable Thermal Regulation Capability for Human Motion Monitoring

Pan,

Wang,

et al. 2024

ACS Appl. Mater. Interfaces

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High-performance flexible strain sensors with synergistic and outstanding thermal regulation function are poised to make a significant impact on next-generation multifunctional sensors. However, it has long been intractable to optimize the sensing performance and high thermal conductivity simultaneously. Herein, a novel flexible sandwich-like strain sensor with advanced thermal regulation capability was prepared by assembling electrospun thermoplastic polyurethane (TPU) fibrous membrane, MXene layer, and TPU/boron nitride nanosheet (BNNS) composite films. The as-prepared sensor demonstrates a wide strain working range (∼100% strain), an ultrahigh gauge factor (2080.9), and a satisfactory reliability. Meanwhile, benefiting from the uniform dispersion and promising orientation of BNNSs in TPU composites, the sensor possesses a high thermal conductivity of 1.5 W•m −1 •K −1 , guaranteeing wearer comfort. Additionally, the unique structure endows the sensor with high stretchability, breathability, biocompatibility, and tunable electromagnetic interference shielding performances. Furthermore, an integrated wireless motion monitoring device based on this sensor is rationally designed. It exhibits a fast response time, a wide recognition range, and the ability to maintain skin temperature during prolonged physical activity. These encouraging findings provide a new and feasible approach to designing high-performance and versatile flexible strain sensors with broad applications in advanced wearable technology.

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Section: Introductionmentioning

confidence: 99%

Sandwich-Like Flexible Breathable Strain Sensor with Tunable Thermal Regulation Capability for Human Motion Monitoring

Pan,

Wang,

et al. 2024

ACS Appl. Mater. Interfaces

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“…However, the traditional approach of maximizing filler content and mixing them randomly in polymers presents limitations in enhancing TC efficiency. More seriously, this method significantly compromises both the mechanical performance and economic viability. − …”

Section: Introductionmentioning

confidence: 99%

3D Printing Interconnected Segregated Composites To Simultaneously Enhance Thermal Conductivity and Mechanical Properties

Fang,

Zhang,

Zou

et al. 2024

ACS Appl. Polym. Mater.

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Effectively thermal conduction pathways are essential for achieving high thermal conductivity (TC) in polymer-based composites. While constructing a segregated structure can yield high TC with low filler loadings, traditional processing methods often have inherent drawbacks, typically involving a complex preparation process and reduced mechanical performance. In this study, a free-form was constructed based on the full advantages of 3D printing. The composite with a dense segregated structure was prepared by 3D printing a scaffold followed by filling with a thermally conductive filler and then hot pressing. Furthermore, boron nitride (BN) was chosen as the electrical insulating and thermally conductive filler model, while graphene (GR) served as the electrical and thermally conductive filler model. Benefiting from the interconnected thermal conductivity network, the 3D-printed composites with GR exhibit a high thermal conductivity of 3.82 W/mK, representing 2.81 times that of composites with randomly blended fillers. Concurrently, these composites also demonstrated robust mechanical properties, achieving tensile strengths of up to 20.3 and 40.6 MPa, respectively, signifying substantial improvements of 1.83 and 3.98 times over their randomly blended counterparts. Therefore, this strategy provides the way for the easy, effective, and universal preparation of thermally conductive composites suitable for various insulated or electrical electronic devices.

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“…Termed “white graphene”, boron nitride nanosheets (BNNSs) are 2D materials obtained through the exfoliation of hexagonal boron nitride (h-BN). These nanosheets share thermal and mechanical strength traits akin to graphene but stand out due to their distinctive properties of electrical insulation (band gap ∼6 eV) and chemical inertness. − Particularly, the thermal conductivity of ultrathin BNNS can reach up to 400–2000 W/m K. The versatility and exceptional thermal properties of BNNS position them as highly suitable candidates for incorporation as thermal conductivity fillers in polymeric composites. − However, achieving large-scale production of high-quality BNNS and maintaining their stable dispersion in various matrices, especially in polymeric composites, are identified as key challenges. BNNS can be synthesized using various methods, including the wet chemical method, ball milling, and liquid-phase exfoliation. − Among these techniques, the liquid-phase exfoliation (LPE) method stands out as a favorable approach for BNNS production due to its simplicity, cost-effectiveness, and high efficiency.…”

Section: Introductionmentioning

confidence: 99%

Eco-Friendly Production of Boron Nitride Nanosheets via Deep Eutectic Solvents and Their Application in Enhancing Thermal Conductivity of PVDF Composites

Sang,

Ban,

Shi

et al. 2024

Langmuir

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Boron nitride nanosheets (BNNS) are expected to be ideal fillers because of their high thermal conductivity and excellent electrical insulation. However, it is still an open challenge to produce BNNS on a large scale using ecofriendly solvents. Here, first, we demonstrate an effective liquid exfoliation method for producing BNNS via utilizing deep eutectic solvents (DES) composed of D,L-menthol and various acids with the assistance of ultrasonication. The results show that the BNNSs with sizes of 1− 2 μm in width and 6−8 nm in thickness were successfully exfoliated with a DES formulation of D,L-menthol and decanoic acid. Second, the obtained BNNSs were used for fabricating 1,6hexanediol diacrylate@polydopamine functionalized BNNS (HDDA@BNNSs-PDA) core−shell microspheres via a Pickering emulsion method. Furthermore, these microspheres were incorporated into a polyvinylidene fluoride (PVDF) matrix to construct 3D thermally conductive networks, leading to a substantial enhancement in the thermal conductivity of the resulting composites. Impressively, the composites with only 25 wt % of BNNS loading reach a high thermal conductivity of 3.20 W/m K, which is a 1500% increase over the pure polymer matrix. This work not only provides a significant way for producing BNNSs ecofriendly but also demonstrates a tactic for constructing 3D thermally conductive networks.

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Thermally conductive composites based on hexagonal boron nitride nanosheets for thermal management: Fundamentals to applications

Cited by 45 publications

References 200 publications

Sandwich-Like Flexible Breathable Strain Sensor with Tunable Thermal Regulation Capability for Human Motion Monitoring

Sandwich-Like Flexible Breathable Strain Sensor with Tunable Thermal Regulation Capability for Human Motion Monitoring

3D Printing Interconnected Segregated Composites To Simultaneously Enhance Thermal Conductivity and Mechanical Properties

Eco-Friendly Production of Boron Nitride Nanosheets via Deep Eutectic Solvents and Their Application in Enhancing Thermal Conductivity of PVDF Composites

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