Article
Engineering, Manufacturing
Jianwei Li, Aifeng Wang, Jianbin Qin, Hongming Zhang, Zhonglei Ma, Guangcheng Zhang
Summary: A composite copper and nickel-plated polymethacrylimide foam was prepared through electroless plating method, showing high surface electrical conductivity and electromagnetic interface shielding effectiveness. The metallized foam-based antennas demonstrated remarkable radiation performances and significant weight reduction compared to traditional metal-based antennas, facilitating lightweight design of portable telecommunication devices.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2021)
Article
Engineering, Multidisciplinary
Shijun Song, Chao Xiong, Junhui Yin, Zhaoshu Yang, Chao Han, Sa Zhang
Summary: In this study, two new sandwich structures, PMI foam-reinforced CSHS (PRCSHS) and aluminum foam-reinforced CSHS (AFRCSHS), were formed by using PMI foam and aluminum foam as reinforcement materials for filling the cells of carbon fiber-reinforced composite square honeycomb sandwiches (CSHSs). The impact resistance and residual fiexural performance of the composites were compared through low-velocity impact (LVI) and three-point bending (3 PB) experiments. The PRCSHS and AFRCSHS showed significantly improved properties, including increased impact load and energy absorption, as well as enhanced residual fiexural load and energy absorption.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Depeng Kong, Dongsheng Wang, Jian Chen, Jiaqing Zhang, Xu He, Bingqing Li, Xiaoqin He, Huan Liu
Summary: Foam extinguishing agents are considered to be important for suppressing fires, and foam stability plays a key role in determining fire-fighting efficiency. This study focuses on the foam stability of mixed foam extinguishing agents, especially under thermal conditions. The effects of mixed types and ratios on foaming ability, drainage, coarsening, and insulation characteristics are systematically studied. The results provide helpful guidance for achieving high effective utilization of different foam extinguishing agents.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Polymer Science
Youjie Sheng, Yunchuan Peng, Shanwen Zhang, Ying Guo, Li Ma, Qiuhong Wang, Hanling Zhang
Summary: The study explores the influence of silica nanoparticles on the thermal stability of gel foams based on a mixture of fluorocarbon and hydrocarbon surfactants. Results indicate that NP concentration significantly affects the molecular interactions, surface tension, conductivity, and viscosity of the dispersions. Addition of NPs reduces the foaming ability of the solution and slows down coarsening, drainage, and decay of the gel foams under thermal action, ultimately enhancing their thermal stability.
Article
Materials Science, Multidisciplinary
ZhengLiang Zhu, WeiWang Chen, YuTong Dong, XiaoMeng Zhou
Summary: In this study, flame-retardant PMI foams were prepared by grafting with N-PBSi and using TBA as the foaming agent. The as-prepared foams showed improved compact structure and enhanced mechanical properties. The introduction of N-PBSi also resulted in better char forming performance of the foams, especially in the air, leading to improved flame retardancy.
MATERIALS RESEARCH EXPRESS
(2023)
Article
Nanoscience & Nanotechnology
Laiming Jiang, Hao Chen, Yushun Zeng, Zhi Tan, Jiagang Wu, Jie Xing, Jianguo Zhu
Summary: This study developed lead-free ceramics based on (K,Na)NbO3 for high-frequency ultrasonic transducers used in multifunctional acoustic tweezers. The ceramics exhibited good piezoelectric performance and temperature stability, and the fabricated piezocomposites showed higher electromechanical coupling properties. The lead-free high-frequency transducers enabled precise and selective manipulation of microparticles.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Engineering, Chemical
Youjie Sheng, Yang Li, Canbin Yan, Yunchuan Peng, Li Ma, Qiuhong Wang
Summary: Foams stabilized by nanoparticles and surfactants have great research potential in environmentally friendly firefighting foams. This study investigates the effect of nanoparticles on the thermal stability of firefighting foams by preparing foam dispersions containing silica nanoparticles, hydrocarbon surfactant (CAD-40), and fluorocarbon surfactant (FS-50). The results show that the concentration of nanoparticles affects the molecular interactions, foaming ability, and thermal stability of the dispersions. Hydrophobic aggregates generated by the adsorption of surfactants on nanoparticle surfaces enhance the foam's thermal stability.
Article
Chemistry, Physical
Youjie Sheng, Yunchuan Peng, Shanwen Zhang, Ying Guo, Li Ma, Hanling Zhang
Summary: This study prepared mixed dispersions of SiO2 nanoparticles with different specific surface areas, nonionic surfactants, and fluorocarbon surfactants in water, and investigated their molecular interactions and the impact on foam stability. The results showed that the addition of nanoparticles can enhance the thermal stability of foam and contribute to the development of environmentally friendly firefighting foams.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Engineering, Multidisciplinary
Haitao Zhang, Xupeng Fan, Weijun Chen, Yubo Wang, Changwei Liu, Baojun Cui, Gang Li, Junjun Song, Daoxiang Zhao, Daming Wang, Liwei Zhao, Xiao Zhang, Huikang Xu, Chunhai Chen
Summary: The study successfully fabricated thermoplastic PI foams with excellent thermal-insulating properties and temperature resistance by linking flexible blocks into rigid polymeric structures through a simple aqueous strategy to construct hydrogen-bonding networks.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Chemistry, Physical
Yanru Chen, Kai Pang, Xiaoting Liu, Kaiwen Li, Jiahao Lu, Shengying Cai, Yingjun Liu, Zhen Xu, Chao Gao
Summary: The rapid development of high-power and high-frequency devices in electronics creates a need for advanced thermal interface materials (TIMs) with high thermal conductivity and structural stability. Previous attempts using silicone-based TIMs with highly thermally conductive fillers have struggled with structural stability in extreme conditions. In this study, we fabricated a flexible TIM called graphene foam roll (GFR) using hydroplastic foaming and interface strengthening methods. By impregnating graphene oxide (GO) into the GFR, we achieved enhanced interface bonding and superior structural integrity. The GFR-TIM exhibited both exceptional structural stability, maintaining mechanical stability after 10,000 cycles at 60% compressive strain, and high temperature resistance up to 500 degrees C, which has not been reported before. Additionally, the GFR-TIM demonstrated higher thermal conductivity (approximately 17.42 W/mK) compared to most commercial TIMs (5-10 W/mK). It can serve as an efficient heat-dissipation component for CPUs and has superior cooling efficiency compared to commercial TIMs. This work presents an advanced graphene-based TIM with excellent environmental adaptability and anti-fatigue properties, expanding its applications in extreme environments such as hypersonic vehicles, high-throughput satellites, and high-power radar systems.
Article
Chemistry, Physical
Ping Ping, Bingqing Li, Jian Chen, Xu He, Dongsheng Wang, Jiaqing Zhang, Depeng Kong
Summary: This study examines the effect of temperature on the stability and film thinning behavior of aqueous film forming foam (AFFF). The results show that temperature significantly influences the foam stability and foam film stability. The foam lifetime decreases exponentially with increasing temperature, indicating decreased stability at higher temperatures. Additionally, a predictive model of film thickness under different temperatures is proposed and verified, considering the effect of temperature on foam fluid viscosity. The changing film surface adsorption, film surface elasticity, and film viscosity under higher temperature are found to cause the exponential decrease in film lifetime.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Engineering, Mechanical
Xintao Huo, Zhongcheng Jiang, Quantian Luo, Qing Li, Guangyong Sun
Summary: This paper reports the systematic experimental characterization of the elastic, plastic, and fracture properties of PMI foam materials under complex loading conditions. The study found that the plastic and fracture parameters are greatly affected by the foam density. Furthermore, the fracture behavior of the PMI foam was investigated and a homogenized finite element model was developed and validated with experiments.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Chemistry, Physical
Youjie Sheng, Shanwen Zhang, Die Hu, Li Ma, Yang Li
Summary: In this study, mixed foam dispersions were prepared using hydrophilic silica nanoparticles, siloxane surfactant, and hydrocarbon surfactant. The interaction between surfactant molecules and nanoparticles, as well as the foamability of the dispersions, were analyzed. The thermal stability of the foam was evaluated through foam drainage, coarsening, and volume decay under thermal radiation. The presence of nanoparticles enhanced foam stability and delayed foam coarsening, drainage, and volume decay under thermal radiation. This research provides theoretical guidance for the development of fluorine-free firefighting foams.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Chemistry, Physical
Weitao Li, Hui Zeng
Summary: Through experiments and simulations, it was found that the betaine surfactant EDSB can stabilize CO2 foam and has better performance at high temperatures, mainly because of its tight molecular arrangement at the C/W interface, forming a more stable foam film.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Thermodynamics
Xiaokun Chen, Wencong Yu, Li Ma, Shasha Zhou, Xixi Liu
Summary: Phenolic foam (PF) exhibits excellent fire resistance and thermal insulation properties. Increasing density improves cell hole sealing and compressive strength, but decreases insulation effect. Chemical structure is not affected by density, but physical properties are influenced by density variations.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
