COMPOSITES PART B-ENGINEERING
·
2016
·
IF 3.85
Chen Pan,Kaichang Kou,Qian Jia,Yu Zhang,Guanglei Wu,Tiezheng Ji
To achieve polymer-based composites for electronic packaging with low dielectric constant, low dielectric loss tangent and high thermal conductivity , silane coupling agent KH550 modified hexagonal boron nitride (hBN) platelets were introduced into PTFE matrix via a cold pressing and sintering method. The effect of surface treatment on the morphology, thermal conductivity and dielectric properties of the composites was investigated. The results revealed that after surface treatment, the interfacial adhension between hBN platelets and PTFE matrix was improved and the in-plane orientation degree of hBN platelets in PTFE matrix decreased, which effectively improvd the thermal conductivity of the composites. The thermal conductivity of hBN-KH550/PTFE composite with 30 vol% filler content is 0.722 W/mK, which is 2.7 folds of pure PTFE. Moreover, the enhanced interfacial adhension and reduced surface hydrophilicity of hBN platelets significantly decreased the interfacial polarization , resulting in not only lower dielectric constant and dielectric loss tangent but also weaker frequency-dependence.
研究领域:
材料科学
·
复合材料
·
电子封装
·
热管理
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Xiao Zhu,Shasha Feng,Shuaifei Zhao,Feng Zhang,Chong Xu,Min Hu,Zhaoxiang Zhong,Weihong Xing
Polytetrafluoroethylene (PTFE) nanofiber membranes have been widely used in various air purification applications attributed to their excellent thermal and chemical stabilities. However, in oily fume purification, oil aerosols can easily permeate through the oleophilic membrane, which may lead to pore blocking, and increased filtration resistance and energy consumption, finally reducing the filtration efficiency and lifespan of the membrane. Herein, we report a hierarchical SiO 2 @PTFE nanofiber membrane by coaxial electrospinning of SiO 2 nanoparticle dispersion as the shell spinning solution and PTFE emulsion as the core spinning solution, followed by in-situ surface grafting of 1H,1H,2H,2H-perfluorooctyltrimethoxysilane. The prepared amphiphobic membrane has both superhydrophobicity and oleophobicity with the water and oil contact angles of 173° and 134°, respectively. It possesses uniform pore structures , high gas permeability (697 m 3 m −2 h −1 kPa −1 ), excellent oily fume filtration efficiency (˃99%), as well as a low pressure drop (2.5 kPa) during 60-min filtration. Furthermore, our perfluorinated amphiphobic SiO 2 @PTFE nanofiber membrane exhibits good reusable and stable properties. This work opens a versatile approach to design efficient functionalized membranes in the field of oily fume purification.
研究领域:
材料科学
·
环境工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Chuan-hua Yang,Yujie Cui,Zhengxi Chen,Yiluo Hu,Xuejun Pan,Siping Ji,Feng-zhi Jiang
Peroxymonosulfate (PMS)-based advanced oxidation processes (PMS-AOPs) currently face issues regarding transition-metal ion valence conversion and practical application in water treatment. To address them, we synthesized a CoOOH catalyst with a unique three-dimensional porous flower-like morphology for PMS activation to degrade 17α-ethinylestradiol (EE2) in wastewater. By adding PMS to CoOOH in small amounts, 95.68 % of EE2 (3 mg/L) was degraded within 9 min. The catalytic efficiency of CoOOH was considerably higher than those of a material synthesized via the conventional precipitation method and commercial Co 3 O 4 . CoOOH also exhibited a wide pH adaptability range, good cyclic stability, and a low cobalt ion leaching concentration. It demonstrated excellent PMS activation performance, chemical stability, and safety. Mechanistic studies revealed that numerous surface hydroxyl groups and abundant oxygen vacancies in CoOOH facilitated efficient electron transfer, rapidly achieved the Co 3+ /Co 2+ redox cycle, and generated a large amount of highly oxidative nonradical ( 1 O 2 ) and radical (•O 2 − ) species, thereby efficiently degrading organic pollutants. Finally, by combining PMS-AOPs with membrane separation, a CoOOH/PTFE membrane–PMS system was fabricated for continuous EE2 degradation in lake water; it could operate continuously for 24 h in treating 1.25 L of Dianchi Lake water (Kunming, Yunnan) containing 3-mg/L EE2 while maintaining an EE2 removal rate of 92.35 %. The synthesized CoOOH/PTFE catalytic membrane facilitated transition-metal ion redox cycling and efficient organic-pollutant degradation as well as enabled convenient catalyst recovery, thereby reducing secondary pollution in the degradation process. Overall, this research provides a feasible strategy for the practical application of PMS-AOPs.
研究领域:
环境科学
·
化学工程
·
催化
·
水处理技术
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Yandi Rao,Aoqi Li,Yuxin Zhang,Fuxi Wang,Tianhu Zhang,Yiping Sheng,Tifeng Jiao
A composite electrochemical oxidation system combined with Electro-Fenton and persulfate (PS) was proposed to degrade metronidazole. The CoFe 2 O 4 -PTFE (CFOP) electrode was used in parallel with the acetylene black-PTFE electrode (ABP) as the dual-cathode of Electro-Fenton. Then the Electro-Fenton was coupled with PS to degrade metronidazole in wastewater synergistically. The self-produce of H 2 O 2 , in-situ circulation of Co(II)/ Co(III) and Fe(III)/ Fe(II), and activation of persulfate were simultaneously conducted. After 120 min, the removal rate of metronidazole reached 90.6% by ABP/CFOP/PS system. The influence of operation parameters (dosage of PS, initial pH, current density, temperature) on the removal of metronidazole was analyzed. The catalyst exhibited good stability and recyclability for five consecutive cycles. The radical quenching and EPR tests reveal that both OH and SO 4 − · are identified responsible for the degradation of metronidazole. The possible decomposition pathway of metronidazole was proposed by HPLC-MS analysis. The toxicity analysis indicates that heterogeneous Electro-Fenton could reduce the toxicity of metronidazole.
研究领域:
环境科学
·
废水处理技术
✓ 已验证
产品关联
DOI
高影响因子
DESALINATION
·
2022
·
IF 11.211
Songchen Xie,Ngie Hing Wong,Jaka Sunarso,Qiang Guo,Chunguang Hou,Zhiguang Pang,Yuelian Peng
Mineral scaling is one of the major challenges for membrane distillation in concentrating high-salinity brine. This work first investigated the characteristic of CaSO 4 scaling, then explored different cleaning reagents to evaluate their efficiencies and mechanisms. By analyzing the SEM and EDX mapping images, the CaSO 4 scaling process could be divided into surface and pore scaling stages. Three cleaning solutions, i.e., commercial detergent (20 %), EDTA-4Na (0.05 M), and MgCl 2 (0.8 M), were chosen for their high CaSO 4 solubility (0.7 g CaSO 4 per 100 g H 2 O). At the surface scaling stage, three cleaning solutions exhibited excellent removal of CaSO 4 scaling with approximately similar 96 % cleaning efficiencies. However, at the pore scaling stage, only the commercial detergent showed high efficiency (89 %). Such high cleaning efficiency was mainly attributed to the detergent's high total dissolved solids (salinity), low pH, and high diffusion rate (5.46 μm cm −1 min −1 ) across the membrane. Moreover, periodic cleaning at the surface scaling stage with the commercial detergent followed by drying throughout a 43.5 h continuous concentration test on an actual RO brine could restore the PTFE membrane performance completely, giving 90 % of the total water recovery . This work provides new insights into the cleaning mechanism for gypsum scaling in a hydrophobic porous membrane.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Yeming Huang,Jingxuan Zhang,Renhong Wang,Bing Gao,Ruyi Miao,Sirun Zhang,Dunju Wang
Improving the energy release efficiency of aluminium powders in weaponry is essential. In this study, uniform core-shell Al@(PFDTES/GAP) was prepared by hydrolyzing PFDTES and co-reacting it with GAP on aluminum powder. It showed better thermal reaction, combustion and energy release. The thermal properties of Al@(PFDTES/GAP) exhibit a significant aluminum-fluorine exothermic phenomenon in DSC, with a 4.9 % increase in exothermic heat in the combustion test compared to raw-Al. For the samples blended with PTFE, Al@(PFDTES/GAP)/PTFE demonstrated excellent performance in terms of increased heat release (increased by 28.0 %) in DSC, higher heat release (increased by 10.2 %) in the heat of combustion test, larger combustion flame area and faster combustion speed (the time reduced by 20.0 %) in the air, compared with that of raw-Al/PTFE. In conclusion, this method is simple and effective to enhance the energy release of aluminium powder, which is of great significance for improving the energy of weapons and equipment.
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
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 16
·A4175
·
IF 3.12
Lubin Sun,Fangxia Zhao,Yuxin Da,Zhenzhong Zhang,Peng Wang
Submicron spherical zinc powders with high surface area, activity and low cost were prepared by DC arc plasma evaporation method. Based on the characterization of morphology, particle size and composition of ultrafine zinc powder, the effects of addition amount of PTFE and compounding of PTFE with PAAs and CMCs, electrolyte addition amount, compound mass ratio of flake and spherical zinc powder on the discharge performance of zinc electrode had been systematically studied. The results showed that ultrafine zinc powder was polycrystalline, spherical and its purity reached 99.96wt%. Under 0.2C, the discharge capacity reached 577.5mAh when addition of PTFE was 10wt.%. When 2.5wt.% PTFE was compound with 6.5wt.%(PAAs: CMCs = 2:1), the discharge capacity improved which reached 613.4 mAh. The discharge capacity was 580.3mAh when the electrolyte content was 38wt.%. When the mass ratio of special flake zinc powder to spherical zinc powder was 3:7, the discharge capacity reached 664.1 mAh, it was 13.5% higher than 584.9 mAh of pure spherical zinc powder and 22.6% higher than 541.5 mAh of pure flake zinc powder. Under 1.8C, compared with alkaline manganese battery prepared using flake zinc powders, the mass specific capacity increased by 57.12% and the volume specific capacity increased by 187.79%.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 26
·17834-17841
·
IF 3.9
Ruihao Wang,Lanting Yang,Zhenwei Zhang,Wenkui Song,Dunju Wang,Changping Guo
Composite explosives with fast reaction rate, high energy release efficiency, and remarkable combustion performance can be obtained by the interaction between homogeneous energetic materials and heterogeneous energetic materials and have broad application prospects. However, ordinary physical mixtures can easily cause separation between the components in the preparation process, which is not conducive to reflecting the advantages of composite materials. In this study, high-energy composite structured explosives with RDX modified by polydopamine as the core and PTFE/Al as the shell were prepared using a simple ultrasonic method. The study of morphology, thermal decomposition, heat release, and combustion performance demonstrated that the quasi-core/shell structured samples have higher exothermic energy, faster combustion rate, more stable combustion characteristics, and lower mechanical sensitivity than the physical mixture.
研究领域:
材料科学
·
燃烧与爆炸学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 41
·e54523
·
IF 3
Guiyou Jiang,Song Wu,Wei Yan,Tian Tian,Yang Li,Youwei Liao,Yan Yang
This paper presents a viable coating design for the production of waterborne coatings using PUA, Silicone-modified-PUA, Al-SiO 2 , and PTFE as key ingredients. The coatings are prepared through an air compression spraying technique followed by a photocuring procedure. The resulting PUA/Silicone-modified-PUA/Al-SiO 2 /PTFE coating exhibits exceptional properties including high hardness, low surface tension, and a low coefficient of friction. Experimental findings reveal noteworthy characteristics of the coating. It possesses a gloss level of 4–6°, a hardness of 492.69 N/mm, an elasticity modulus of 11469.94 MPa, a surface roughness of 0.87 μm, a dynamic coefficient of friction of 0.125 μN, and a surface tension of 0.4967 mN/m. To assess its performance, the coating underwent rigorous tests such as the CS-5 Wool Touchpad Shinning Friction test with a 200 g load over 250,000 cycles. It exhibited minimal changes in gloss (≤2°) and color difference (∆E ≤ 0.75). Additionally, the CS-10 abrasive head Optical Surface Taber Abrasion Resistance test was conducted using a 500 g load for 10 cycles, resulting in a Class 1 rating, and after 100 cycles, it achieved a Class 3 rating. This demonstrates its remarkable resistance to tribological environments, enduring tapping, touching, and scraping by fingers over extended periods.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
Metals
·
2019
·Vol. 9
·期 2
·170
·
IF 2.259
Limei Ren,Tengchao Wang,Zhaoxiang Chen,Yunyu Li,Lihe Qian
A self-lubricating plasma electrolytic oxidation–polytetrafluoroethylene (PEO–PTFE) composite coating was successfully fabricated on the surface of commercially pure titanium by a multiple-step method of plasma electrolytic oxidation, dipping and sintering treatment. The microstructure and tribological properties of the PEO–PTFE composite coating were investigated and compared with the PEO TiO2coating and the PTFE coating on titanium. Results show that most of the micro-pores of the PEO TiO2coating were filled by PTFE and the surface roughness of PEO–PTFE composite coating was lower than that of the PEO TiO2coating. Furthermore, the PEO–PTFE composite coating shows excellent tribological properties with low friction coefficient and low wear rate. This study provides an insight for guiding the design of self-lubricating and wear-resistant PEO composite coatings.
✓ 已验证
DOI
高影响因子
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
·
2017
·
IF 2.63
Hansong Zhang,Hua Yan,Zhide Hu,Jianjian Yang,Fanghao Niu
Polytetrafluoroethylene (PTFE) micropowders were employed in this work to fabricate PTFE-oil organogel, then carbonyl iron particles were dispersed in this thixotropic organogel to prepare magnetorheological fluids without any other additives. By performing a comparative investigation of MRFs’ performances, enhanced magnetorheological response, suspension stability and tribological performance were obtained contrast to pure silicon oil based MRFs. The experimental results revealed a changeable viscosity of organogel, considerable increases in thixotropy also can be observed with the increase of PTFE content. Sedimentation tests demonstrated a much better suspension stability of MRFs based on organogel, suggesting that the internal network microstructures formed by hydrogen bonds between PTFE microparticles and oil molecular chains are likely to impose the gaps among magnetic particles thus hinder the particle aggregation and sedimentation. Moreover, a critical PTFE volume fraction about 4.7 vol% was recognized in this study, lower content organogels tended to display enhanced yield stresses contrast to pure silicon oil based MRFs while high content organogels showed slightly lower ones. It may suggest a compromise between nonmagnetic particle adsorption and the reinforcement effect of network microstructures. The adsorption is likely to decrease the saturation magnetization of carbonyl iron particles and to hinder the formation of field-induced chains, however, the reinforcement effect tends to strengthen these magnetic chains. Besides, the tribological tests confirmed the lubricant effects of PTFE-oil organogel by acquiring rather sharp decreases in friction coefficients of organogel based MRFs especially in the presence of magnetic field.
研究领域:
材料科学
·
流变学
·
智能材料
·
摩擦学
·
胶体与界面科学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Yu Liu,Gan Yuan,Fei Xie,Yang An,Jianwen Sun,Ning Zhao,Yongbo Deng,Longnan Li,Subhash C. Singh,Chi-Vinh Ngo,Wei Li,Chunlei Guo
Water, sanitation, and hygiene (WASH) investments have become crucial not only to prevent and recover from pandemics and local outbreaks but also to prevent the spread of antimicrobial resistance . However, over 2 billion people worldwide still have access to even poor sanitation, which devastates public health and social and economic development. In addition, inadequate sanitation can cause contamination to drinking water sources where exist insufficient protection, exacerbating clean water scarcity. Here, we introduce a femtosecond laser processing technology combined with silicone oil coating to prepare a slippery surface that can repel feces, named the fecalphobic surface. Compared to a flat surface, the fecalphobic surface requires only a quarter amount of water (on average) or even no water to remove sticky viscoelastic solid-like fecal simulants. Besides, various liquids will slide off this surface. Moreover, the simulant slides off the fecalphobic surface much faster than off an untreated one, approximately 3–26 times faster depending on their weight. The mechanism of the fast sliding of fecal simulants is explained. Moreover, the fecalphobic surface is installed on a latrine prototype that integrates an automatic trap door and a urine-feces separator for improved sanitation solution.
研究领域:
生物医学工程
·
公共卫生
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）