CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Yongxin Qian,Yang Tao,Wang Li,You Li,Tian Xu,Jinian Hao,Qinghui Jiang,Yubo Luo,Junyou Yang
Electronic packaging materials with efficient heat dissipation and anti-electromagnetic-interference performance are highly desirable to realize the long-term stable operation of highly integrated electronic devices. Such combined functions of heat dissipation and anti-electromagnetic-interference are achieved here by filling 3D CNF@C-Ni network skeleton in epoxy resins (EP). The CNF@C-Ni is a carbon nanofibers network skeleton embedded with micron flower-like C-Ni particles and has been obtained by carbonizing nickel metal–organic frameworks (Ni-MOF) embellished bacterial cellulose. The 3D CNF@C-Ni network skeleton provides a highly efficient heat transfer channel for EP, rendering a high thermal conductivity of 0.5 W·m −1 K −1 at room temperature for the 5 wt% CNF@C-Ni filled EP, ~2.8 times higher than that of pristine EP. In addition, the flower-like C-Ni particles realize an optimization in the impedance matching of CNF@C-Ni/EP, enabling a high electromagnetic wave absorption performance in the wave-transparent epoxy resins. In particular, a lowest reflection loss value of −49.77 dB at 13.44 GHz with a maximum effective bandwidth of 5.44 GHz (from 12.08 to 17.52 GHz) has been achieved in the 5 wt% CNF@C-Ni filled epoxy resins with a thickness of 2.2 mm. Such a new dual-functionated epoxy resin with combined high electromagnetic wave absorption and thermal management performance shows great potential in manufacturing of highly integrated electronic devices.
研究领域:
材料科学
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电子工程
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复合材料
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Hongjun Wang,Jiafu Wang,Wentong Li,Zhe Li,Xiaoyu Zhang,Weitao Zheng,Tan Su,Jiaqi Zhang
The utilization of conductive hydrogels , particularly in the domain of wearable technology, has garnered substantial attention. However, the limited mechanical properties, low sensitivity, and lack of multifunctionality in conventional conductive hydrogels constrain their potential applications. Thus, the endeavor to develop conductive hydrogels with exceptional comprehensive performance remains a formidable challenge. In this investigation, chitosan quaternary ammonium salts and the conductive polymer poly (3,4-ethylenedioxythiophene)-poly (styrenesulfonate) were employed as precursor materials, incorporating carboxylated cellulose nanofibers , to synthesize a novel double-crosslinked network hydrogel. The resulting hydrogel specimen exhibited noteworthy tensile strength (2.13 MPa), significantly enhanced elongation (547%), favorable strain sensitivity (Gauge Factor ranging from 0.91 to 9.78), and electrical self-healing capabilities. Additionally, it demonstrated accurate detection of subtle human movements and conversion of raw data into binary data. This research provides valuable insights into the advancement of conductive hydrogels for wearable soft electronics.
研究领域:
材料科学
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生物医学工程
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柔性电子学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Xiuli Xie,Xiaotong Wang,Yang Zhang,Long Fang,Jiangshan Feng,Shaohong Liu,Dingshan Yu,Fangming Zhu,Xudong Chen
Herein, we develop a new intelligent moisture-sensitive hybrid aerogel by evenly embedding a proton-conductive covalent organic framework (COF-2SO3H) into a carboxylated cellulose nanofiber network (CNF-C) for water harvesting and spontaneous sustained electricity production from ambient humidity and human respiration. Our strategy first exploits the “suspending agent” role of CNF-C to stably disperse COF materials in water for forming uniform hierarchical hybrid structures. By utilizing the synergy of COF-2SO3H and CNF-C together with their inherent structure merits and surface group effects, the hybrid aerogel displays increased water uptake and ion conductivity. Upon asymmetric moisturization, it can create a self-maintained moisture gradient to engender a concentration difference for mobile Na+ and H+, resulting in efficient charge separation and diffusion. Thus, the hybrid aerogel-based coin-type generator achieves a continuous output voltage of ∼0.55 V for at least 5 h in ambient environments in contrast to that using pure CNF-C and carbon-based generators with transient voltage response. Intriguingly, the wearable generator with an aerogel in a mask is more sensitive to human respiration and achieves repeatable and reliable self-charge for persistent electricity along with an increased output voltage of up to 1.0 V and much faster self-charge (only 3 min), both of which surpass most reported moisture-enabled generators.
研究领域:
材料科学
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能源
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环境科学
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纳米技术
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生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 35
·e55889
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IF 2.7
Xiaohong Wang,Bin Yang,Yue Zhang,Yuqing Yang,Huijie Lu,Hao Wang,Ziyi Wang,Jiasheng Qian,Ru Xia,Ning Jia,Yuchao Ke
Phase-change materials (PCMs) have become a hot spot in the development of modern thermal management materials because of their absorbing and releasing heat while keeping the temperature constant during phase change process. However, their relatively low thermal conductivity (TC) considerably restricts their further application. In this work, graphene nanosheets (GNS) were initially nickel-plated to increase the contact area between adjacent GNS (in the form of Ni@GNS) by constructing a “point-surface” structure. Then, the prepared Ni@GNS was coated with polydopamine (PDA) to prepare PDA-Ni@GNS, which helped to effectively reduce the interface thermal resistance (ITR) between the filler and the matrix, and also made the prepared filler more easily dispersed in the polymer matrix. By constructing well-defined three-dimensional (3D) thermally conductive pathways in the matrix, the PCMs exhibited excellent TC and effectively prevented the leakage of polyethylene glycol (PEG) even at low filler loading. The results of thermogravimetry (TG), differential scanning calorimeter (DSC), and cyclic DSC tests jointly showed that the PDA-Ni@GNS/CNF-C/SA/PEG PCMs displayed excellent thermal storage properties, high latent heat as well as good cyclic thermal stability. The present study provides a facile way of preparing PEG-based PCMs, which are applicable in thermal management area.
研究领域:
材料科学
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热能工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）