CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Weiye Chen,Lei Chen,Liangyu Li,Chuanshuai Dong,Lizhi Zhang
Phase change energy storage technology has broad applications in many engineering fields, such as building energy conservation, aerospace, and thermal management of electric equipment. However, the inorganic phase change materials suffer a lot from supercooling, phase separation, and low thermal conductivity. Therefore, this paper aims at developing a novel electrically-triggered phase change composite by making use of its supercooling characteristics, achieving a controllable release of latent heat as it is wanted. Polished by radial and axial grinding respectively, both surface-triggered electrodes (STE) with a uniform rough structure and point-triggered electrodes (PTE) with the gradient rough structure were prepared to investigate the effect of surface structure on the electrical crystallization. The 100-cycle test results indicated the newly-prepared electrode achieved a stable electrically-triggering ability. The oxidation rate of electrodes was significantly affected by interface characteristics of the gas–liquid-solid interfaces. What’s more, the effect of voltage and supercooling degree on the crystallization behaviours, like induction time, morphology, and growth of the dendrite, and heat transfer process, were comprehensively investigated. With the increase of the supercooling degree, the dendrite shape gradually changed from acicular crystal to flocculent crystal, and the induction time decreased rapidly. To improve the thermal conductivity, a novel phase change composite using sodium acetate trihydrate/carboxymethyl cellulose/expanded graphite (SAT/CMC/EG) was developed. Considering both thermal conductivity and electrical nucleation, the optimized mass ratio of SAT: CMC: EG was 100:1:8. These research findings would provide valuable guidance in the intelligently-controllable energy storage technology.
研究领域:
材料科学
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能源存储技术
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Wenyuan Yu,Yanxuan Zhao,Jianping Ge
Anticounterfeiting materials based on the photonic crystal (PC) have attracted great interest due to their unique visual effects originating from the changeable structural colors under various external stimuli. However, there still are challenges to improving the anticounterfeiting performance by enhancing the complexity and diversity of the color changes. Here, we fabricated an electrically triggered anticounterfeiting tag by encapsulating the responsive PC with the surface-modified and patterned ITO electrode. The degree of Au deposition or chemical etching in different regions of the ITO was precisely controlled to achieve multi-level differentiated electrical responses, which made the invisible pattern of the tag at 0 V be “revealed in multicolor form” or “gradually revealed” under increasing voltages. The tag possessed two working modes, more diversified visual effects, good usability, and reversibility, which let it become a potentially useful material for anti-counterfeiting applications in the future.
研究领域:
材料科学
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光学工程
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DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2019
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IF 8.456
Liming Qin,Ying Chu,Xin Zhou,Qinmin Pan
Self-healability is a crucial feature for developing artificial superhydrophobic surfaces. Although self-healing of microscopic defects has been reported, the restoration of severely damaged superhydrophobic surfaces remains a technological challenge. Here, we report a robust superhydrophobic surface possessing ultrafast recoverability after catastrophic damage. The surface is fabricated via integrating its hierarchical texture comprised of Super P (a conductive carbon black) and TiO2 nanoparticles into a poly(dimethylsiloxane) network cross-linked by dynamic pyrogallol-Fe coordination. In the presence of an electrical trigger, the surface restores its macroscopic configuration, hierarchical texture, mechanical properties, and wettability within 1 min after being cut or plasma etching. The restoration is attributed to the reconstruction of the multiscale structures through dynamic coordination. Application of the self-healable surface is demonstrated by a fast de-icing process. The present investigation offers a novel insight into the durability and reliability of artificial superhydrophobic surfaces against catastrophic damage, which has potential application in the fields including self-cleaning, anti-icing, advanced electronics, and so on.
研究领域:
材料科学
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表面工程
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产品关联
DOI
PubMed
高影响因子
ACS Applied Electronic Materials
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2024
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IF 4.3
Chuanchuan Dai,Yinghao Qi,Jiaqi Gao,Zhaoxin Li,Yu Wu,Xuhuang Chen
The investigation of cyclic stability holds paramount significance in the realm of conductive polymer composites (CPCs), specifically in applications related to overcurrent protection, self-heating, and sensors. This study employs a melt-blending methodology to synthesize CPCs comprising high-density polyethylene (HDPE) and tungsten carbide (WC), with a focus on identifying the key factors influencing cyclic stability. A comparative analysis is conducted between two triggering mechanisms: external thermal activation and electric heating. The CPCs demonstrate a pronounced positive temperature coefficient (PTC) and exceptional cyclic stability when subjected to external thermal triggering. Subsequent to the electrical triggering of the composite material, the resistance change rate exhibits an increase with a rising impact voltage. Moreover, the rate of resistance variation correlates positively with a reduction in the WC content. Utilizing the dielectrophoresis theory model, this study scrutinizes alterations in the conductive network under an electric field, revealing agglomeration tendencies among particles of the CPCs. Significantly, the introduction of self-cross-linking agents proves effective in mitigating this phenomenon. Consequently, beyond ensuring external thermal cyclic stability, as well as that under electric field conditions, this emerges as a pivotal consideration in the realm of CPCs.
研究领域:
材料科学
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电气工程
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 8
·期 1
·303-309
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IF 6.641
Shuai Yang,Yang He,Yanju Liu,Jinsong Leng
In this paper, a series of shape-memory poly(arylene ether ketone)s (PAKEs) with various flexible groups (i.e., carbolic bonds, ether, and ketone linkages) and entangled crystalline polymeric structures were synthesized by combining different bisphenol monomer (bisphenol A monomer and methyl hydroquinone monomer) proportions with a 4,4′-difluorobenzophenone monomer. The flexible parts and the entangled parts acted as a reversible phase and permanent phase, respectively. The prepared PAEK films exhibited excellent heat-triggered shape-memory behaviors with tunable glass transition temperatures (Tg) from 116 °C to 140.5 °C including an extremely high fixity ratio (over 98%), high recovery ratio (over 92%), and fast recovery rate (within 7.0 s). As increasing the content of the methyl hydroquinone monomer in the structural unit, the recovery ratio showed a downward trend, whereas the recovery time increased gradually. In addition, the electric-triggered shape-memory effect of the PAEK films was achieved via the introduction of carbon nanotubes (CNTs). Upon applying a voltage of 25 V, the recovery ratios of the composite films containing 10 wt% and 15 wt% CNTs were all over 80% (of 83.0% and 87.6%, respectively), indicating a great electric-triggered shape-memory behavior. The recovery ratio increased and the triggered voltage decreased as increasing the content of CNTs. The heat and electric dual-triggered shape-memory PAEK composites could be important smart materials possessing wide application prospects.
研究领域:
材料科学
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高分子化学
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2025
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IF 2.8
Shuai Yang,Xiaoyun Yang,Zijian Song,Yingchun Li
Herein, we report light/electric synergistic-triggered shape memory poly(aryl ether ketone) (PAEK) composite actuators with enhanced shape memory behaviors that are able to fulfill the shape deformation process for various application opportunities. Composite actuators exhibit great shape memory behaviors with a high shape recovery ratio (95.1%–99.2%) and fixity ratio (over 96%). Besides, we construct light/electric synergistic-triggered shape memory behaviors, which are achieved through the prior softening of molecular chains by irradiating firstly, and then triggered by applied voltage. The shape recovery ratio of these light/electric synergistic-triggered shape memory effect (SME) reaches up to 89.6%, which is higher than the electric-triggered SME of 75.1%, indicating enhanced shape memory behaviors. As a comparison, we construct light/electric synchronous-triggered shape memory behaviors, and the recovery ratio is 85.8%. Due to the enhanced shape memory behaviors, these light/electric synergistic-triggered shape memory composite actuators fulfill the shape deformation process for various application opportunities.
研究领域:
材料科学
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聚合物复合材料
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智能材料
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执行器
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形状记忆合金/聚合物
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）