PROGRESS IN ORGANIC COATINGS
·
2020
·
IF 4.469
Yadong Yu,Lei Chen,Ding Weng,Jiadao Wang,Chaolang Chen,Awais Mahmood
Ice accretion is detrimental for the safety of transmission lines, aircraft, and buildings, which may also result in economic loss. In this study, a thin polytetrafluoroethylene (PTFE) coating on the aluminum substrate was fabricated by electrostatic attraction self-assembly technique and proposed for large-scale deicing application. The shear-force F i c e analysis on deicing and related ice adhesion is conducted while interfacial toughness between solid-ice interfaces was also measured. Moreover, the surface morphology, wettability of the PTFE coated aluminum plate was also characterized. It was observed that the critical bonded length L c between ice and PTFE coated surface is about 2.85 cm. When the bonded length L was higher than this value, the shear-force of dislodging ice could stay constant at about 50 N for the first deicing cycle. From the second deicing cycle, the constant shear-force is increased to 70 N and kept constant for at least ten cycles. Meanwhile, the surface roughness and water contact angle kept on increasing along with the loss of PTFE nanoparticles during icing-deicing cycles. Ultimately, An ice layer with the size of 98 cm × 96 cm×1 cm (L × w×h) was developed on the surface of PTFE coated aluminum substrate for the demonstration of its fracture and falling off under ice’s weight.
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
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
·
2021
·
IF 5.551
Jie Gao,Yujun Deng,Linfa Peng,Peiyun Yi,Zhongqin Lin
The preparation of hierarchical microstructured surfaces to obtain different wettability has been studied in both academy and industry. Polytetrafluoroethylene (PTFE) is an ideal material for preparing superhydrophobic surface due to its ultra-low surface energy. However, it is still a challenge to prepare hierarchical structure on the surface of PTFE. In this paper, PTFE films with hierarchical structure were successfully prepared by micro powder hot embossing (mPHE) process. Through characterization, the maximum contact angle and minimum sliding angle can reach up to 164° and 5.3° respectively. The influence of processing parameters and particle size on forming qualities was discussed. A dimensionless indicator was proposed to successfully describe the hierarchical character and characterize the relationship between wetting states and forming quality. Finally, a series of mechanical and chemical durability tests were carried out, verifying the practical application value of the prepared PTFE films.
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
RSC Advances
·
2017
·Vol. 7
·期 53
·33450-33458
·
IF 3.108
Liu Liu,Fei Yan,Fangyuan Gai,Linghan Xiao,Lei Shang,Ming Li,Yuhui Ao
Polyetheretherketone (PEEK)/short carbon fiber (SCF)/polytetrafluoroethylene (PTFE)/graphene (GE) composites (PSPGE) with different weight fractions of GE were prepared successfully. The effect of GE on the tribological behavior of PEEK composites was investigated under different applied pressures, sliding speeds and temperatures. Characterization results revealed that the tribological performance was improved with the increase of GE loading, and 2.0 wt% GE filled PEEK/SCF/PTFE composites had the lowest friction coefficient and wear rate. The PSPGE exhibited excellent lubrication and wear resistance efficiency especially under harsh conditions. Moreover, the improved thermal conductivity of the PSPGE composites allowed friction heat to be transferred and further increased the wear resistance. Thus, this newly developed novel PSP2.0GE composite could be applied to many new fields as an advanced friction material.
研究领域:
材料科学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2023
·
IF 17.6
Changjun Yang,Yamei Wang,Yan Wang,Zehui Zhao,Liwen Zhang,Huawei Chen
Liquid-solid based triboelectric nanogenerator (TENG) can be widely utilized for droplet energy harvesting , in which the hydrophobicity of triboelectric layer is crucial for output enhancement. However, poor mechanical properties of hydrophobic triboelectric layers prepared in classic methods greatly limit the TENG’s application. Here, a stretchable hydrophobic triboelectric nanogenerator (SH-TENG) with excellent output, and durability is devised by strongly bonding PTFE micro particles on a flexible substrate even under extreme stretching or abrasion. By synergistic enhancement of the PTFE particles on both contact-separation and charge-transfer between droplet and triboelectric layer, the transfer charge density of SH-TENG is increased to ∼4.74 × 10 −3 C/m 2 ·L, along with the open circuit voltage (V OC ) and short circuit current (I SC ) over 7 times and 6 times higher than TENG without PTFE modified, respectively. Moreover, under a stretching rate of 500%, the SH-TENG shows less 20% decline of its output performance to guarantee applications in flexible electronics. A miniature watch can be sufficiently powered by the SH-TENGs with total area of 0.016 m 2 under the simulated raindrop flow rate of 50 mL/min. With such outstanding performance and environmental adaptability, the SH-TENG can be integrated with various objects to collect droplet energy and supply electronic devices.
研究领域:
材料科学
·
能源技术
·
纳米科技
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2022
·
IF 6.76
Binbin Zhang,Mengying Qiao,Weichen Xu,Baorong Hou
Water-repellent and interfacial non-wetting superhydrophobicity has great potential to address corrosion/icing-induced material-deterioration problems. Herein, an all-organic superhydrophobic coating was constructed using facile and substrate-independent spray-coating method based on PTFE and PDMS . FE-SEM, EDS, and XPS techniques were used to analyze the surface topographies and chemical compositions. The coating exhibits superior anti-fouling and self-cleaning properties against various liquid and solid contaminants due to the synergic effect of low surface energy and hierarchical structures. The EIS and potentiodynamic polarization results show improved charge transfer resistance ( R ct ), positive shifted corrosion potential ( E corr ), and decreased corrosion current density ( I corr ), implying significantly enhanced anti-corrosion performance with 99.83 % inhibition efficiency. Besides, the delay rate of ice-freezing time of the coating is 232 % at −5°C, 137 % at −10 °C and 204 % at −15 °C compared with uncoated Q235 substrate respectively. The ice adhesion strength of the coating accounts for only 6.55 % at −5°C, 7.03 % at −10 °C and 9.35 % at −15 °C than that of the bare Q235 carbon steel, demonstrating ultra-low ice adhesion force and anti-icing capabilities. The hygroscopic and deliquesce behaviors of NaCl salt particles reveal an intriguing salt-deliquescence self-coalescence phenomenon and prospective anti-corrosion mechanism for superhydrophobic materials in high-humidity marine atmospheric environments.
研究领域:
材料科学
·
表面工程
·
腐蚀与防护
✓ 已验证
DOI
高影响因子
TRIBOLOGY LETTERS
·
2019
·Vol. 67
·期 3
·1-11
·
IF 2.235
Chang Qiuying,Zhang Hao,Gao Rongqin
Nanocomposite lubricant additive consisting of Magnesium silicate hydroxide and amorphous carbon (MSH@C) was prepared. Amorphous carbon in the nanocomposite of MSH@C was obtained by hydrothermal decomposition of polytetrafluoroethylene (PTFE) under subcritical water condition. The MSH@C was characterized by Scanning electron microscope, X-ray diffractometer, Fourier transform infrared spectrometer, Raman spectrometer, and X-ray photoelectron spectrometer. The analysis results show that addition of PTFE in the process of synthesizing MSH can inhibit the tubular crystallization of MSH@C powder. Tribological experiments show that the doping of amorphous carbon materials can significantly enhance the friction reduction and wear resistance of nanocomposite powders as lubricant additive, and is superior to MSH and fully formulated commercial lubricant 5W30. The tribofilm on the worn balls including amorphous carbon originated from MSH@C nanoparticles accounts for the significant tribological properties.
研究领域:
材料科学
·
摩擦学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 53
·期 7
·5204-5215
·
IF 2.599
Teng Xiangguo,Yu Cong,Wu Xiufen,Dong Yichao,Gao Peng,Hu Huili,Zhu Yongming,Dai Jicui
How to solve the crossover of vanadium ions through ion exchange membrane is a key issue in vanadium redox flow battery (VRB), especially for ultra-thin membranes used for VRB to obtain a lower cell resistance. Herein, an ultra-thin (~ 30 μm) PTFE/SPEEK [polytetrafluoroethylene/sulfonated poly(ether ether ketone), P/S] membrane is successfully prepared and modified by using layer-by-layer (LBL) self-assembly technique with polycation poly(diallyldimethylammonium chloride) (PDDA) and polyanion poly(sodium styrene sulfonate) (PSS). P/S membranes are alternatively immersed in positively and negatively charged polyelectrolyte to form 2 to 8 bilayers onto its surface. Consequently, a series of P/S-[PDDA/PSS]
n
( n is the number of multilayers) membranes are fabricated. Both the physicochemical properties and VRB performances of the P/S-[PDDA/PSS]
n
membranes are then investigated in detail. Results show that the ion selectivity of the P/S-[PDDA/PSS]
n
membranes is much higher than that of pristine P/S membrane, especially for P/S-[PDDA/PSS] 6 membrane. As a result, the VRB with the P/S-[PDDA/PSS] 6 membrane exhibits the highest coulombic efficiency (CE) of 96.5% at 80 mA cm −2 , the highest voltage efficiency of 94.7% at 40 mA cm −2 and the highest energy efficiency of 87.7% at both 40 and 50 mA cm −2 , respectively. In addition, 80 times charge–discharge test proves that the P/S-[PDDA/PSS] 6 membrane possesses high stability and no obvious CE decay after running. All the results show that the LBL technique is an effective way to prepare ultra-thin membrane with high ion selectivity for VRB application.
研究领域:
电化学
·
能源材料
·
膜科学
·
储能技术
·
高分子材料
·
电化学工程
✓ 已验证
DOI
高影响因子
DESALINATION
·
2025
·
IF 9.8
Fuxin Qiu,Fan Liu,Rui Tian,Xutong Han,Kaikai Chen,Qinglin Huang
Polytetrafluoroethylene (PTFE) nanofiltration (NF) membrane has gained increasing attention due to its comprehensive outstanding performance. However, the inherent low surface energy of PTFE makes it difficult to construct a functional NF layer on its surface. In this study, we have presented a novel three-layer of PTFE composite NF membrane with the electrospun PTFE nanofiber membrane as the substrate. During which, the cross-linked polyvinyl alcohol (PVA) was utilized to ensure the high adhesion strength between the polyamide (PA) selective layer and the substrate of PTFE nanofiber membrane. Furthermore, we have further optimized the physical and chemical structure of the composite NF membrane by adjusting the structure and thickness of the PA selective layer and the PVA-GA (glutaraldehyde) layer. When the TMC (1,3,5-benzenetricarbonyl trichloride) and PIP (piperazine) concentration were 2 % and 6 %, the PVA concentration was 2 %, the obtained composite membrane achieved a high multivalent salts rejection rate (99.2 % for Na 2 SO 4 ) and permeation flux (14.41 L∙m −2 ∙h −1 ∙bar −1 ). Additionally, the obtained PTFE composite NF membranes demonstrated durability against solvents and long-term reliability after ultrasonic treatment, acid/alkali treatment, sustained operation for 48 h, and cyclic experiments. These findings offer a practical method for the industry's utilization of PTFE NF substrates in the separation of salt solutions.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 12
·5439-5446
·
IF 2.7
Kangjia Ding,Lijuan Wei,Yangfeng Guo,Tingting Zhang,Dongfang Wang,Yiyang Xu,Qian Li
Polytetrafluoroethylene (PTFE) is widely used for wastewater treatment and desalination in industry. However, the hydrophobicity of PTFE hampers water penetration and increases energy consumption in water purification. In this investigation, organic/inorganic hybridization was employed to attain enduring hydrophilicity on PTFE films. Initially, we utilized benzoin dianion/DMSO to generate unsaturated bonds. Then, acidic potassium permanganate was applied to transform these carbon–carbon unsaturated bonds into hydrophilic functional groups. The results demonstrated a decrease in water contact angles from 119 ± 1° for pristine PTFE films to 28 ± 2.5° after processing. Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy confirmed the presence of introduced hydrophilic groups, including carbonyl (CO) and carboxyl (–COOH) groups, on the surface of the PTFE, and the hydrophilicity of the PTFE films was further improved by the inclusion of a manganese compound. Moreover, the robustness of the modification has been demonstrated under a range of challenging conditions. PTFE with a robust organic/inorganic hybrid coating holds promise for applications in wastewater treatment, offering an economic solution for the hydrophilic modification of PTFE used in water purification.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER ENGINEERING
·
2023
·Vol. 43
·期 3
·231-242
·
IF 2
Jiazhu Li,Yanqing Liu,Liwei Qu,Xian Cao,Xianning Li
In this study, polypyrrole was prepared by in situ chemical oxidation polymerization and deposited on the surface of the PTFE membrane. The surface morphology of the membrane shown that the membrane fouling degree of the modified membrane was much lower than that of the original membrane. Besides, the contact angle value decreased from 107.20° to 72.62°, and its hydrophilicity was significantly enhanced. It took humic acid (HA) as a typical representative membrane foulants, and static and dynamic HA adsorption experiments were carried out on the membranes before and after modification. In the static adsorption experiment of HA, the adsorption capacity of an original membrane was 1.28 times that of a modified membrane. In the dynamic antifouling experiment of HA, the rejection of the modified membrane to HA was 62.99%, while that of the original membrane was only 39.82%. In addition, the experimental results showed that the modified membrane had a higher flux recovery rate, which was 1.18 times that of the original membrane. This study proves that the modified membrane has an extraordinary antifouling effect.
研究领域:
材料科学
·
环境工程
·
膜技术
✓ 已验证
DOI
高影响因子
CORROSION SCIENCE
·
2022
·
IF 7.72
Kaixin Xu,Wen Sun,Lida Wang,Zhengqing Yang,Bohang Li,Yunsheng Ma,Liqiu Zhao,Chenghe Zhang,Shiheng Ma,Haoxue Han,Guichang Liu
To improve the corrosion protection properties of polytetrafluoroethylene (PTFE) in highly corrosive H 2 SO 4 solutions, Janus PTFE coatings (PDA/PEI@PTFE) were constructed. The modified side is achieved by co-deposition of polydopamine (PDA) and polyethyleneimine (PEI) on the sodium naphthalene etched side of PTFE. It not only has a 5-fold increase in interfacial adhesion with substrates via chemical bonds, but also exhibits improved barrier properties due to the coverage of dense PDA/PEI film, with corresponding corrosion resistance increase by ~2–3 orders of magnitude. Meanwhile, the untreated side is hydrophobic pristine PTFE and has good self-cleaning properties and excellent resistance in concentrated H 2 SO 4 solutions.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
DOI
高影响因子
COMPOSITE INTERFACES
·
2018
·
IF 1.048
Bin Zhang,Jian Han
Inspired by the highly ordered structure and excellent mechanical performance of nacre, surface functionalization of graphene (GE) has been prepared, polytetrafluoroethylene (PTFE)/glass fabric (GF) composites modified by introducing the GE and in vertical immersion method. The results show the negatively charged poly(sodium-p-styrenesulfonate) coat on the GE and prevent aggregation, and thus form stable dispersions. The tensile strength and toughness of PTFE/GF composites achieve the maximal value of 25.1 MPa and 20.2 MJ/m3, respectively, as well as the surface resistivity achieve the minimum value of 1000 Ω cm. With the incorporation of GE, the mechanical properties and electrical conductivity of PTFE/GF composites improve significantly. Moreover, modified GE further increases the properties of PTFE/GF composites. Modified GE shows better dispersion effect than pure GE.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）