Journal of Energy Storage
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2024
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IF 8.9
Xudong Xu,Shuai Yin,Xinyu Zhai,Zide Wu,Jinlong Wang,Jiangfeng Ma,Xiaotian Peng,Hao Peng
Nano-encapsulated phase change materials (NEPCMs) with appropriate phase change temperature range and excellent anti-permeability have significant application value in the field of thermal regulation dressings. In this study, NEPCMs were synthesized using the microemulsion polymerization method, with eutectic fatty acids (LA-SA) as the core material and poly(methyl methacrylate) (PMMA) as the shell material. Subsequently, using the electrostatic adsorption method, chitosan (CS) was successfully coated onto the outer surface of NEPCMs, resulting in the preparation of a novel bilayer shell nano-encapsulated phase change materials (BS-NEPCMs) for thermal regulation dressings. The impact of core/shell ratio, CS acid solution concentration and cross-linking agent content on capsule properties was investigated. It was found that BS-NEPCMs exhibited excellent cyclical stability and thermal stability. In particular, the CS shell layer provided excellent interfacial impermeability effects for the capsules, achieving an anti-permeability efficiency of 96.21 %. This not only helps address the problem of high leakage rates in single wall capsules, but also ensures that the capsules maintain high phase change enthalpies of 99.32 J/g and 96.38 J/g, respectively. The dressings based on BS-NEPCMs demonstrated good thermal regulation at 33–42 °C with maximum phase change enthalpies of 39.53 J/g and 34.08 J/g, respectively. Swelling and rheological analysis showed that the dressing exhibits a gel state, with a swelling ratio of 343 %, an elastic modulus of 15 kPa and a viscous modulus of 4 kPa. This study indicated that BS-NEPCMs hold significant promise for various applications in energy storage and body thermal regulation fields.
研究领域:
材料科学
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纳米技术
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热管理
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生物医学工程
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产品关联
DOI
高影响因子
ACS Applied Polymer Materials
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2024
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IF 4.4
Jiao Ai,Si-Rong Cheng,Ming-Hua Wu,Guo-Cheng Zhu,Jia Xu,Huan-Xia Zhang
This article reports an innovative method for using flexible, extremely sensitive double-layer composite fibers in thermal response sensors. A double-layer fiber sensor with dual corresponding effects is prepared by assembling poly(methyl methacrylate) (PMMA) and graphene layers using dry spinning. The sensor achieves sensitive thermal deformation ability by utilizing the bimetallic sheet principle and the difference in thermal expansion performance between the two materials. The sensor can respond to light stimuli by doping the graphene layer with TiO2 and TiN. The reduced graphene oxide (rGO)/PMMA double-layer fiber thermal response sensor prepared by the chemical reduction of graphene has a fast response ability. When the relative temperature changes from 20 to 50 °C, the sensor response time averages within 2 s, and the bidirectional curvature change rate of the fiber material can reach a maximum of 300%. The sensor exhibits real-time, sensitive electrical performance changes under the stimulation of moisture or light temperature, demonstrating excellent stability and recyclability. Weaving double-layer fibers into two-dimensional (2D) fabrics and monitoring environmental temperature through changes in sensor deformation and electrical properties lays a solid theoretical foundation in thermal sensing and intelligent fabrics.
研究领域:
材料科学
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纺织工程
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传感技术
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纳米技术
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可穿戴技术
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
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2024
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IF 5.1
Wenkang Liu,Yiwei Li,Changren Zhou,Tao Yu
ABSTRACT The treatment of vertebral compression fractures of the spinal necessitates the use of injectable bone repair materials with the adaptive modulus of elasticity. Currently, newly developed injectable self-curing materials for minimally invasive surgery are primarily categorized into calcium phosphate and calcium silicate systems, both of which exhibit excellent biocompatibility. However, calcium phosphate bone cement lacks adequate mechanical properties and the stress does not match between bone and material. Calcium silicate cement has a long curing time, low mechanical strength, and high alkalinity. These deficiencies render them inadequate for meeting clinical requirements. Therefore, we incorporated inorganic disodium phosphate, organic polyvinyl alcohol, and solid component cerium oxide into the matrix phase of tricalcium silicate bone cement to establish a ternary self-curing hydration reinforcement system and produced an organic-inorganic composite injectable bone cement. Even though the composite bone cement has a longer setting time, it exhibited high compressive strength (61.9Mpa) and fracture strain (7.88%), demonstrating excellent mechanical properties. Furthermore, it also demonstrates good injectable properties (86%), anti-collapse properties, good biological activity, and outstanding antibacterial properties. The composite bone cement has great potential to develop a new injectable self-curing material to replace PMMA bone cement in clinical vertebral compression fractures.
研究领域:
材料科学
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骨科手术
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生物材料
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生物医学工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Jingshun Wang,Yongquan Zhang,Zengxu Chen,Shuo Fan,Qihui Zhang,Yue Zhang,Tiandong Zhang,Changhai Zhang,Qingguo Chi
Polymer electrolytes have become widely popular on account of their low expenses, reduced weight, simple processing, and excellent safety features. However, polymer electrolytes have yet to find use in commercial batteries because of their limited mechanical durability and poor ionic conductivity . In this paper, an ultra-stable cycles and interfaces blending polymer electrolyte (BPE) suitable for all solid-state Li metal batteries was prepared by blending three polymers: polymethyl methacrylate (PMMA), polyvinylidene fluoride hexafluoropropylene (PVDF-HFP), and polyethylene oxide (PEO). Microstructure characterization showed numerous amorphous areas with strong interfacial strength of the BPE. The BPE3 exhibited a maximum of 15.65 MPa in tensile strength. BPE2 have excellent electrochemical performance, such as wide electrochemical windows (up to 4.7 V vs Li/Li + ), high lithium ion transference numbers (up to 0.75), high ion conductivity (up to 1.87 × 10 -4 S cm −1 at 60 °C), and excellent interface stability. By assembling all state-solid LiFePO 4 /BPE2/Li batteries for electrochemical testing, BPE2 exhibit high electrochemical characteristics. BPE2 discharge specific capacity is as high as 154.7 mAh g −1 at 1C. The BPE2 underwent 200 cycles at 0.5C and 400 cycles at 1C, with capacity retention rates of 95.7 % and 96.6 %, respectively. BPE is a promising electrolyte candidate for flexible lithium metal batteries.
研究领域:
材料科学
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电化学
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电池技术
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聚合物科学
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DOI
高影响因子
危险品化学品经营许可证（带存储）