JOURNAL OF MATERIALS SCIENCE
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2021
·Vol. 56
·期 23
·13259-13270
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IF 4.22
Ma Chunyan,Wei Chun,Bai Junwei,Deng Jianguo
As a kind of inorganic filler, boron carbide powder-toughened polymer matrix has been widely studied. However, the layered boron carbide scaffold composites with large area orientation are rarely reported. A series of hierarchically aligned scaffolds of boron carbide and polyvinyl alcohol (B 4 C/PVA) with different B 4 C mass fractions are prepared by a bidirectional freeze-casting method. These ordered, lamellar B 4 C/PVA scaffolds allow paraffin wax to penetrate rapidly to form composite phase change materials (CPCMs). The molten paraffin trapped in this structure remains stable and has a little amount of leakage because of capillary effect. And the leakage rate is 1.1 wt% and 1.6 wt% after 25 cycles at the temperature interval of 25–80 °C and 25–90 °C, respectively. The highest retention of latent heat is up to 90% for specimen of 1%-a. And the thermal conductivity of CPCMs is 0.33 W m −1 K −1 for 8%-e. Graphical abstract Hierarchically aligned B 4 C/PVA scaffolds fabricated by
bidirectional freeze casting can improve structure stability of PCMs
and hamper the leakage of paraffin.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2022
·Vol. 33
·期 10
·3279-3285
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IF 3.348
Jiaji Cheng,Yuqi Liu,Moyun Kang,Shaoshuai Niu,Yapeng Wang,Yu Guan,Feng Zhang
Due to the energy crisis and environmental pollution, the research on energy-efficient building has increasingly attracted attention. The phase change materials (PCMs) play a vital role in increasing the energy utilization efficiency. In order to protect the PCMs from leakage during phase change process, the melamine sponge (MS) and modified melamine sponge (MMS) are considered as the frameworks. The leakage rate of MS and MMS sample were compared. The thermal and fire behavior was investigated by small room model, infrared thermal imager and cone calorimeter. The results show that the leakage rate of MS is much higher than that of MMS. On the condition of the same percentage of PCMs, MMS sample has better temperature control performance. The MS sample releases heat much faster and more than MMS sample. While MMS plays a role in inhibiting ignition.
研究领域:
建筑材料
·
能源工程
✓ 已验证
DOI
高影响因子
POLYMER
·
2020
·
IF 4.231
Ze Ding,Wenbin Yang,Fangfang He,Zhuoni Jiang,Ren He,Jinghui Fan,Kai Zhang
A novel elastic shape-stabilized phase change materials (SSPCMs) were obtained by reducing and vulcanizing a graphene oxide (GO) modified phase change latex (PCL), which is composed of ethylene propylene diene monomer (EPDM) and paraffin. GO as Pickering emulsifier assisted in fabricating EPDM/paraffin PCL. The zeta potential showed that the PCL was stable. Meanwhile, optical microscope and particle size test indicated that the average particle size was 3–5 μm. Scanning electron microscopy (SEM) showed that the SSPCMs were composed of reduced GO (RGO)-coated phase change composite microspheres (PCCMs). The intact RGO coating was beneficial to prevent the leakage of paraffin. According to the leakage rate test, the leakage rate of SSPCMs were decreased. When the GO content was 0.5%, the leakage rate of SSPCMs was 0.3%. The mechanical properties test showed that the tensile strength and elongation at break were up to 2.26 MPa and 1663.53%, respectively. The comprehensive properties of the prepared SSPCM make it have great potential in the field of building temperature control.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Hao Deng,Yunmiao Yang,Xiaohong Tang,Yongsheng Li,Fangfang He,Quanping Zhang,Zhong Huang,Zhijian Yang,Wenbin Yang
A kind of silicone rubber (SR)/paraffin (Pa)@silicon dioxide (SiO2)@polydopamine (PDA) phase-change composite was prepared in this work. The double-shelled Pa@SiO2@PDA phase-change microcapsules were constructed by oxidative self-polymerization of dopamine (DA) in Tris-HCl buffer solution. The effect of the DA content on the properties of Pa@SiO2@PDA microcapsules and SR/Pa@SiO2@PDA composites was researched. Due to the protective effect of SiO2, PDA layer, and SR matrix, the SR/Pa@SiO2@PDA composites have good leak-proofing performance, and the leakage rate of SR/Pa@SiO2@PDA-2 is as low as 0.45%. Phase-change enthalpies of the Pa@SiO2@PDA microcapsules and SR/Pa@SiO2@PDA composites are reduced slightly with increasing DA content. Meanwhile, the composites displayed improved mechanical strength. The tensile strength of SR/Pa@SiO2@PDA-2 can be up to 0.560 MPa, which is 1.85 times higher than the tensile strength of pure SR/Pa@SiO2 because the interface compatibility between Pa@SiO2 microcapsules and SR is improved through hydrogen bonding between the abundant groups on the PDA surface and the matrix. Moreover, the rough surface of the PDA-modified microcapsules also enhances the interface interaction through physical “interlocking”. The new kind of SR/Pa@SiO2@PDA composite can be used for thermal management.
研究领域:
材料科学
·
热管理工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED THERMAL ENGINEERING
·
2025
·
IF 6.9
Junxiu Piao,Zongyao Zhang,Tianyi Li,Xu Han,Sheng Bi
Phase change materials (PCMs) hold considerable promise for battery thermal management. However, their widespread application is hindered by leakage risk and low thermal conductivity. This study synthesized a novel MXene-modified microencapsulated PCM (MPCM/MXene) via in-situ polymerization, where MXene nanosheets act as bridges connecting multiple microcapsules to enhance thermal conductivity. Morphological analysis confirmed the embedded nature of MXene as an inter-microcapsule bridge. The results of thermal properties showed a substantial improvement in heat transfer performance, with the MPCM/MXene achieving a thermal conductivity of 0.13 W·m −1 ·K −1 , 120 % higher than that of pristine microencapsulated PCM. Thermal cycling tests demonstrated a 50.5 % reduction in leakage rate for MPCM/MXene after 100 cycles, confirming that the MXene bridging network significantly boosts thermal conductivity. This “bridging” structure effectively reduces internal thermal stress within the microcapsules and enhances their mechanical strength. Furthermore, MPCM/MXene exhibits excellent energy storage capability, evidenced by its enthalpy value of 97.1 J/g. Battery thermal management tests underscored the superior cooling performance of MPCM/MXene, effectively controlling the peak temperature of the battery module below 40 °C. Therefore, the developed MPCM/MXene exhibits outstanding thermal performance and demonstrates broad application prospects for battery thermal management systems (BTMS).
研究领域:
材料科学
·
纳米技术
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储能
·
热工学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Guanjun Liu,Fan Yang,Wenbo Liu,Weicheng Jiao,Xiaodong He,Rongguo Wang
High gas barrier polyethylene (PE) composites containing non-oxidized graphene flakes (GFs) were fabricated through solution blending. GFs were synthesized through ultrasonic-assisted electrochemical exfoliation of graphite. Then, GFs were functionalized via directly inducing PE molecular crystallization along their surface under proper temperature and PE/GFs ratio. The composites with only 0.5 wt% GFs gave a helium leak rate of 6.29 × 10 −8 Pa m 3 /s at 0.6 MPa, outperforming pure PE with a decrease of 83.4%. In addition, the interface interaction between PE and GFs is very weak, and the cohesive energy is only 0.1448 J m −2 . Therefore, at high GFs concentrations (>0.5 wt%), the continuous weak interfaces between the GFs interconnected networks and PE will reduce the effective diffusion path to a certain extent, leading to the reduction of gas barrier efficiency. In general, this method offers great promise for barrier materials that can be utilized in lightweight high-pressure gas storage vessels.
研究领域:
材料科学
·
化学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2024
·
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
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Hanlong Wang,Shifeng Zhu,Jiaoyue Sheng,Feihong Gao,Lei Yang,Xili Hu,Francisco Fernández-Martínez,Longhui Lin,Chaoyu You,Dongming Xing
Lead halide perovskite has demonstrated remarkable potential in the wearable field due to its exceptional photoelectric conversion capability. However, its lead toxicity issue has consistently been subject to criticism, significantly impeding its practical application. To address this challenge, an innovative approach called lead-rivet was proposed for the in-situ growth of perovskite crystalline structures. Through the formation of S-Pb bonds, each Pb 2+ ion was firmly immobilized on the surface of the silica matrix, enabling in situ growth of perovskite nanocrystals via ion coordination between Cs + and halide species. The robust S-Pb bonding effectively restricted the mobility of lead ions and stabilized the perovskite structure without relying on surface ligands, thereby not only preventing toxicity leakage but also providing a favorable interface for depositing protective shells. The obtained perovskites exhibit intense and narrow-band fluorescence with full-width at half-maximum less than 23 nm and show excellent stability to high temperature (above 202 °C) and high humidity (water immersion over 27 days), thus making it possible to be used in varies textile technologies including melt spinning and wet spinning. The lead leakage rate of particles is only 4.15 % demonstrating excellent toxicity inhibition performance. The prepared fibers maintained good extensibility and flexibility which could be used for 3D-printing and textiles weaving. Most importantly, the detected Pb 2+ leaching was negligible as low as to 0.732 ppb which meet the standard of World Health Organization (WHO) for drinking water (<10 ppb), and the cell survival rate remained 99.196 % for PLA fluorescent filament after 24 h cultivation which showing excellent safety to human body and environment. This study establishes a controllable and highly adaptable synthesis method, thereby providing a promising avenue for the safe utilization of perovskite materials.
研究领域:
材料科学
·
纳米技术
·
环境科学
·
纺织工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）