Synergetic improvement of dielectric properties and thermal conductivity in Zn@ZnO/carbon fiber reinforced silicone rubber dielectric elastomers

Wang, Fang; Zhou, Wenying; He, Yingfei; Lv, Yajuan; Wang, Ying; Wang, Zijun

doi:10.1016/j.compositesa.2024.108129

Cited by 19 publications

(2 citation statements)

References 42 publications

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“…TEM images ( Figure 3 e,f) confirmed the three-dimensional porous structure of the SrV 4 O 9 @rGO composite. The porous nanostructure increases the contact area between the active material and the electrolyte and effectively reduces the ion diffusion distance, thus improving ion transport efficiency [ 28 , 29 , 30 , 31 , 32 ]. In addition, the porous nanostructure provides sufficient buffering space for volume expansion during cycling processes, effectively enhancing cycling stability [ 33 , 34 , 35 , 36 , 37 , 38 ].…”

Section: Resultsmentioning

confidence: 99%

Reduced Graphene Oxide-Supported SrV4O9 Microflowers with Enhanced Electrochemical Performance for Sodium-Ion Batteries

Li,

Zhang

et al. 2024

Molecules

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Sodium-ion batteries (SIBs) have received considerable attention in recent years. Anode material is one of the key factors that determine SIBs’ electrochemical performance. Current commercial hard carbon anode shows poor rate performance, which greatly limits applications of SIBs. In this study, a novel vanadium-based material, SrV4O9, was proposed as an anode for SIBs, and its Na+ storage properties were studied for the first time. To enhance the electrical conductivity of SrV4O9 material, a microflower structure was designed and reduced graphene oxide (rGO) was introduced as a host to support SrV4O9 microflowers. The microflower structure effectively reduced electron diffusion distance, thus enhancing the electrical conductivity of the SrV4O9 material. The rGO showed excellent flexibility and electrical conductivity, which effectively improved the cycling life and rate performance of the SrV4O9 composite material. As a result, the SrV4O9@rGO composite showed excellent electrochemical performance (a stable capacity of 273.4 mAh g−1 after 200 cycles at 0.2 A g−1 and a high capacity of 120.4 mAh g−1 at 10.0 A g−1), indicating that SrV4O9@rGO composite can be an ideal anode material for SIBs.

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Section: Resultsmentioning

confidence: 99%

Reduced Graphene Oxide-Supported SrV4O9 Microflowers with Enhanced Electrochemical Performance for Sodium-Ion Batteries

Li,

Zhang

et al. 2024

Molecules

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“…Previous studies on TIMs have revealed the crucial functions of interface and well-designed orientation, in which the former minimizes the interfacial thermal resistance (ITR) and the latter provides channels for phonon transport. , The efficient establishment of phonon transfer channels will ultimately improve the κ of thermally conductive composites. Boron nitride nanosheets (BNNSs), sometimes known as “white graphene,” have garnered a lot of interest because of their comparable honeycomb structure to graphene, exceptional mechanical strength, and remarkable thermal conducticity and chemical durability .…”

Section: Introductionmentioning

confidence: 99%

Heterostructured Alumina/Boron Nitride Nanosheets for Thermal Management of Poly(dimethylsiloxane)

Zheng,

Wu,

Zhan

et al. 2024

ACS Appl. Nano Mater.

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The development of heterostructures offers an effective method for influencing thermal transport mechanisms. This work presents the preparation of heterostructured, thermally conductive alumina nanosphere@boron nitride nanosheet (f-A@B) fillers that resemble "sesame crackers" using the in situ approach. Benefited from the synergistic effect of zero-dimensional (0D) alumina/two-dimensional (2D) boron nitride nanosheet (BNNS) heterostructures in which alumina and BNNS are boned at the interface, the f-A@B/poly(dimethylsiloxane) (PDMS) nanocomposites presented excellent heat dissipation efficiency. The in situ method of uniformly connecting alumina to the BNNS interlaminar is essential for supplying a heat conduction channel. At a mass fraction of 30 wt % f-A@B, the f-A@B/PDMS nanocomposite presents the optimal thermal conductivity (κ) of 3.72 W m −1 K −1 , a 1279% increase over pure PDMS. The modified Hashin−Shtrikman (MHS) model verifies and explains the experimental results, suggesting that the reduced filler-to-filler interfacial thermal resistance accounts for the construction of the f-A@B heterostructure. Meanwhile, the as-prepared composites also exhibit exceptional volume resistivity up to 2.2 × 10 13 Ω cm, which is 4 orders of magnitude greater than the critical resistance for electrical insulation (10 9 Ω cm). The composites with superior thermal conductive and electrical insulating properties may open up future opportunities in electrical packaging and thermal management.

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Surface functionalization of naturally occurring silicate minerals infused hydrocarbon polymer matrix for ultra‐low dielectric performance at high frequency domain

Islam,

Deb,

Hasan

et al. 2024

Polymer Composites

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The expanding realm of high‐frequency electronics necessitates materials with exceptional attributes: notably, a low dielectric constant (Dk) to minimize signal propagation delays, high thermal conductivity for effective heat dissipation, higher breakdown strength, and robust mechanical properties to withstand demanding operational environments. While cycloolefin copolymers (COC) excel in electrical insulation, chemical resistance, and mechanical durability, their intrinsic slightly higher dielectric constant compared to other polymers, along with challenges such as poor dispersibility and low compatibility with nanoparticles, hinder their full potential in this domain. Considering these drawbacks, this study fabricated a series of COC/mica composites by integrating natural mica particles into the COC matrix via a CTAB‐assisted surface modification of mica to enhance dispersibility and mitigating particle aggregation through in‐situ mixing and hot‐press methods. The resultant composites demonstrate an outstanding ultra‐low Dk of 1.44, marking a significant decrease of over 36% compared to pristine COC with a Dk of 2.26, along with exceptionally low dielectric loss (δ) of 0.00013 at the frequency of 10 GHz, high dielectric breakdown strength ~49.40 kV/mm and enhanced thermal conductivity up to 0.88 W/(m K) at 40% mica loading. Additionally, the composites heightened mechanical performances like tensile strength 69 MPa at 6.5% elongation at break, impact strength up to ~17.9 kJ × m−2, and exceptional water resistance with absorption below 0.097%. These exceptional ultra‐low dielectric performance with above mentioned properties can meet the stringent requirements of modern high‐frequency electronics packaging for next generation electronics development.Highlights Surface modification by CTAB enhanced homogeneous dispersibility of composites. Achieved ultra‐low dielectric constant and loss compared to pure COC. Thermal conductivity improved significantly with incorporation of mica. Unlocking high‐frequency applications potential with ultralow Dk performance.

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Synergetic improvement of dielectric properties and thermal conductivity in Zn@ZnO/carbon fiber reinforced silicone rubber dielectric elastomers

Cited by 19 publications

References 42 publications

Reduced Graphene Oxide-Supported SrV4O9 Microflowers with Enhanced Electrochemical Performance for Sodium-Ion Batteries

Reduced Graphene Oxide-Supported SrV4O9 Microflowers with Enhanced Electrochemical Performance for Sodium-Ion Batteries

Heterostructured Alumina/Boron Nitride Nanosheets for Thermal Management of Poly(dimethylsiloxane)

Surface functionalization of naturally occurring silicate minerals infused hydrocarbon polymer matrix for ultra‐low dielectric performance at high frequency domain

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