INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2015
·
IF 2.587
Zhiqiao He,Lixian Jiang,Da Wang,Jianping Qiu,Jianmeng Chen,Shuang Song
A series of fluorinated anatase TiO2 nanosheets with dominant {001} facets were synthesized to oxidize p-chlorophenol (PCP) and reduce Cr(VI) simultaneously under visible light. The {001}/{101} surface facets ratio of TiO2 was controlled by varying the initial HF concentration, and fluorine-free samples were obtained by alkaline-washing. A synergistic effect among TiO2, Cr(VI), and PCP was observed, which is ascribed to effective trapping of photogenerated electrons and holes by Cr(VI) and PCP, respectively. A maximum synergistic effect was obtained at a molar ratio of [PCP] to [Cr(VI)] of one. Using X-ray diffraction, X-ray photoelectron spectroscopy, electron paramagnetic resonance spectroscopy, field-emission scanning electron microscopy, transmission electron microscopy, and Brunauer–Emmett–Teller analyses, the optimum ratio of exposed {001} to {101} facets for TiO2 was determined to be 80:20 because of selective transfer and charge balance of photogenerated carriers. Surface fluorination facilitates the formation of oxygen vacancies and unsaturated Ti atoms, which is useful for visible light activity induction, extending the lifetime of photogenerated electron-hole pairs, and enhancing the rate of PCP oxidation and Cr(VI) reduction.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Jianing Wang,Haokai Yan,Yuxiang Zhao,Daheng Wu,Haoyong Yang,Xiaodong Yin,Runxiang Tan,Tao Zhang
Copper-based materials are very important for many application fields from marine industry to energy management and electronic devices. For most of these applications, the copper objects require long-term contact to a wet and salty environment, which leads to serious corrosion of copper. In this work, we report a thin graphdiyne layer directly grown on arbitrary shapes of copper objects at mild conditions, which could function as a protective coating for the copper substrates in artificial seawater with corrosion inhibition efficiency of ∼99.75%. To further improve the protective performance of the coating, the graphdiyne layer is fluorinated and followed by infusion with a fluorine-containing lubricant (i.e., perfluoropolyether). As a result, a slippery surface is obtained, which shows enhanced corrosion inhibition efficiency of ∼99.99% as well as excellent antibiofouling properties against microorganisms, such as protein and algae. Finally, the coatings are successfully applied in the protection of a commercial copper radiator from long-term attack of artificial seawater without disturbing its thermal conductivity. These results demonstrate the great potential of graphdiyne-based functional coatings for the protection of copper devices in aggressive environments.
研究领域:
材料科学
·
化学工程
·
海洋科学
✓ 已验证
DOI
PubMed
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 37
·22810-22817
·
IF 3.108
Zhenhua Li,Jingsong Liu,Ying Yuan,Enzhu Li,Fu Wang
In this work, fluoride-functionalized glass fiber (F-GF) was prepared, in which glass fiber (GF) was modified with γ-methacryloxy propyltrimethoxy silane (γ-MPS), and then reacted with 2,2,2-trifluoroethyl methacrylate (TFEMA). Subsequently, PTFE/glass fiber microwave composites were prepared by incorporating 5 wt% of the GF, γ-MPS modified GF (M-GF) or F-GF into PTFE. The effect of F-GF on the mechanical and dielectric properties, as well as moisture absorption and coefficient of thermal expansion of the composites were investigated. The results show that fluorine is successfully grafted onto the surface of GF through –CF3 group, and F-GF forms a dense and compact interfacial structure with PTFE. The mechanical properties of PTFE/F-GF, including tensile strength (38.53 MPa) and elongation (226.82%), are obviously higher than those of PTFE/M-GF (34.73 MPa and 179.50%, respectively) and PTFE/GF (34.82 MPa and 174.33%, respectively). In addition, the PTFE/F-GF composite shows improved density (2.174 g cm−3), dielectric constant (2.18), and decreased dielectric loss (0.0009), moisture absorption (0.008%) and temperature coefficient of dielectric constant (−18.6 ppm per °C). The conclusions demonstrate that the method of surface fluorination of glass fibers offers promising application in PTFE based microwave materials.
研究领域:
材料科学
·
复合材料
✓ 已验证
DOI
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 2
·1009-1017
·
IF 3.9
Xizhi Zhang,Xiaozhong Chen,Wenchao Min,Guowei Liang,Wei Zhang,Shuheng Yao,Ximing Zhong
Using porous materials for sound absorption is an effective approach to alleviating noise pollution, although their hydrophilic properties potentially cause concerns regarding public safety and health risks. This work provides a facile strategy for establishing a multifunctional ceramic system by using sponges as the sintering template, adjusting the pore structure of ceramic foams by varying the ceramic slurry weights and fluorinating the sintered ceramic foams via hydrolysis and condensation processes to provide low surface energy. The obtained porous ceramic foams demonstrate sound-absorbing, waterproof, and antibacterial properties. The results reveal that the increase in ceramic slurry weight decreases the pore size and porosity due to the formation of more compact structures, and the decrease in porosity compromises the sound absorption performance. In the middle-range sound frequency, the maximum sound absorption coefficient reached 0.92. In addition, the fluorination of the rough ceramic surfaces endows the ceramic foams with waterproof properties, which enables them to float on water and display the silver mirror phenomenon. In addition, due to the waterproof property reducing the contact area between the ceramic surface and the bacterial suspension, as well as the lipophilic fluorine chain disrupting the bacterial structures, these ceramic foams exhibited antibacterial rates above 95%. In addition, the mechanisms underlying the sound-absorbing, waterproof, and antibacterial properties of these porous ceramic foams are elucidated. Therefore, this work provides a facile approach to developing a multifunctional ceramic system. Their practical features make these ceramic foams more significant in the field of noise reduction.
研究领域:
材料科学
·
声学工程
·
生物医学
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Lingyu Liu,Qixuan Li,Luxin Sun,Aqib Riaz,Jianxin Li,Yingge Wang,Ingo Pinnau,Xiaohua Ma
One major challenge of helium recovery from natural gas by membranes is the development of materials offers both high He permeability and He/CH 4 selectivity. Here, ultrahigh performance He separation membranes were achieved by directly fluorination of a carbon molecular sieve (CMS) membrane that derived from pyrolyzing a polyimide at 550 °C. The FCMS550-60, fluorinated for 60 s, showed an unprecedented combination of high He permeability of 3432 Barrer and ultrahigh He/CH 4 selectivity of 5329 that is located far beyond any He/CH 4 trade-off lines. Additionally, it also exhibited outstanding mixed-gas separation properties with a He permeability of 1765 Barrer and He/CH 4 selectivity of 4114 at 20 bar. The largely enhanced He/CH 4 selectivity resulted exclusively from a boost in diffusion selectivity, which is originated from the formation of C–F bonds inside the micropores of the CMS membrane that remarkably enhanced the sieving ability of the FCMS membrane. This work provides a broad prospect for the application of FCMS membranes for He recovery from natural gas and other resources.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER TESTING
·
2023
·
IF 5.1
Changhua Yang,Hengtong Zhang,Renqiang Yang,Pengfei Ma,Yuansen Liu,Min Nie
Interventional catheter is the essential assembly part of interventional therapy. Confronted with complex channels, the catheter suffers from weak mechanical property, high catheter-tissue friction and inferior biocompatibility. Herein, the robust mechanical, lubricated and biocompatible molybdenum disulfide (MoS 2 )/polypropylene (PPR) catheter was fabricated via flow-directed preferential alignment and fluorination treatment. By rotating the mandrel and die, a dual-directional flow field was constructed and the two-dimensional MoS 2 plates aligned preferentially with the planar surface perpendicular to the radial direction of the catheter. Benefiting from the preferential alignment of MoS 2 plates, the tensile strength of the rotationally-extruded MoS 2 /PPR catheter increased by 25.1% compared to the pristine PPR catheter. Furthermore, the direct fluorination treatment was applied to endow the optimized tribology performance and biocompatibility. As a result, the MoS 2 /PPR catheter with excellent comprehensive performance was prepared by bulk morphology and surface manipulation strategy, which was suitable for industrial scale preparation.
研究领域:
材料科学
·
生物医学工程
·
介入治疗
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Xing Xing,Yurong Zhao,Congbin Xu,Yali He,Chen Yang,Kang Xiao,Jianzhong Zheng,Baolin Deng
Membrane distillation, an emerging desalination technology, shows much promise for treating industrial wastewater with high salinity. One major challenge that impedes its implementation for industrial applications is the wetting of hydrophobic membranes such as polyvinylidene fluoride (PVDF), resulting in a sharp decline in salt rejection. Wetting occurs when the feed solution contains surfactants, such as sodium dodecyl sulfate (SDS). It has been demonstrated that growing rough structures on the membrane surface followed by fluorination helps the membrane maintain its hydrophobicity. In this study, an omniphobic membrane was successfully prepared by first growing a layer of dense nano-ZnO needles on the surface of a pristine PVDF membrane, followed by a typical fluorination treatment. The modified membrane, with its surface similar to a nano sea urchin in appearance, exhibited a superior antiwetting property, having a high contact angle about 160° against a 50 g/L NaCl solution containing 0.3 mM SDS. The modified membrane showed a fairly good wetting resistance against 0.3 mM SDS, having a nearly 100% salt rejection in treating 50 g/L NaCl, whereas the pristine PVDF membrane could be easily wetted. The modified PVDF membrane shows promise in treating high-salinity wastewaters containing surface-active substances.
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
Nano Energy
·
2024
·
IF 16.8
Han Wu,Xuguang Liu,Wen Li,Shenglin Kang,Boyu Zhu,Lijun Yang,Ruijin Liao,Zhenlian An,Jiyu Wang
Triboelectric polymer with high charge density and stable output performance is the cornerstone to promote the urgent commercialization of triboelectric nanogenerators (TENGs) for various applications. In this work, the facilitated surface manipulation strategy based on direct fluorination technique is applied for triboelectric polymers to boost their performance. The Polydimethylsiloxane film as experimental samples is treated with different fluorination temperatures and times, whose characterization results demonstrated significant changes in both physical and chemical properties. The F atoms substitution in the fluorination process yields strong electron-withdrawing groups on the molecular, and a μm level fluorinated layer is formed with nanostructured surface . In the atmosphere environment, the fluorinated sample-based contact separation TENG attains a maximum charge density of about 150 μC/m 2 , an enhancement of 385% compared to the original sample. Meanwhile, the TENG features favorable output stability with output charge retention of about 87% in a high humidity environment and realizes sustainable operation in the long term. The enhanced charge density is attributed to the fluorinated molecular with negative electrostatic potential and lower energy level of the lowest unoccupied molecular orbital , while a rougher and denser physical structure with favorable humidity resistance allows to maintain the charge stability. Finally, the manipulation strategy for elevating the electrification performance of triboelectric polymers is summarized in terms of both elemental composition and physical structure. This work represents a feasible approach to manipulate the triboelectric polymer on surface that can be large-scale preparation and utilization, which is dedicated to guiding high performance TENGs employment towards commercialization and practical application in the near future.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
·
2025
·
IF 3.1
Kaixuan Sun,Haoxuan Sun,Xianghan Du,Zixuan Zhao,Geng Chen,Fangcheng Lv,Xiang Yu
Poly(m-phenylene isophthalamide) (PMIA) is renowned for its superior insulating and mechanical properties, holding immense promise in ultra-high voltage transmission systems. To further enhance the mechanical robustness of nanofiber-based paper, microfibers have been employed as reinforcement fillers. However, interfacial issues have emerged as a challenge, compromising the insulation properties. In this work, we present the realization of synergistically enhanced breakdown strength and mechanical properties in the PMIA micro-nano composite paper, achieved by interface fluorination treatment. With an optimized fluorination time of 60 s, the composite structure becomes more compact, greatly enhancing its overall integrity. The fluorine-rich interface provides potential electron traps and hydrogen bond sites, which play a crucial role in enhancing both electrical insulation and mechanical properties. The breakdown strength is increased by 19.5%, achieving a high value of 295.6 kV/mm. Concurrently, Young’s modulus and tensile strength are enhanced to 4.04 GPa and 24.38 MPa with increases of 32.9% and 14.8%, respectively. However, it is noteworthy that excessive plasma fluorination can induce surface structural damage to microfibers, impeding the adhesion of nanofibers. It leads to a deterioration in both electrical and mechanical properties. Moreover, the optimized paper shows exceptional flexibility, foldability, and colorability, opening new avenues for their utilization in demanding electrical environments.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2013
·
IF 2.112
Jinyou Lin,Feng Tian,Bin Ding,Jianyong Yu,Jie Wang,Aikifa Raza
In this work, we report the facile synthesis of robust amphiphobic nanofibrous membranes via the (fluoroalkyl)silane surface modification of electrospun poly(meta-phenylene isophthalamide) (PMIA) nanofibrous membranes. The fluorinated PMIA nanofibrous membranes showed a nonwettable property for water and oil, exhibiting an amphiphobicity. The results indicated that the FAS molecules were successfully coated on the PMIA electrospun fibers in the form of a monolayer, which did not cause the severe changes of fiber morphology. The electrospun PMIA nanofibrous membranes have a good tensile strength, in particular the aligned PMIA nanofibrous membrane can enable the tensile strength to be increased doubly compared with the randomly oriented PMIA nanofibrous membrane, up to 78.56 ± 2.06 MPa. The fluorinated PMIA nanofibrous membrane may have a good thermostability due to its inherent properties, exhibiting a potential application in reinforced nanomaterials, automobile air filters, template of structure coatings, etc., requiring high strength and high thermal resistance.
研究领域:
材料科学
·
表面化学
✓ 已验证
DOI
高影响因子
Friction
·
2022
·Vol. 10
·期 11
·1824-1837
·
IF 4.924
Liu Shutian,Dong Conglin,Yuan Chengqing,Bai Xiuqin
Natural materials tend to exhibit excellent performance in the engineering field because of their structure and special functions. A natural red willow, called natural porous wood material (NPWM), was found, and wear tests were conducted to determine its potential as an oil-impregnated material by utilizing its special porous structure. Fluorination treatment was adopted to improve the NPWM properties for absorbing and storing lubricating oil. The different contributions of soaking and fluorination-soaking treatments on the tribological properties of NPWMs and their respective mechanism of effect were revealed. The results showed that the fluorination-soaking treatment helped absorb and store sufficient lubricating oil in the NPWM porous structure; therefore, more lubricating oil would be squeezed out and function as a tribol-film between contacting surfaces during the friction process, thus ultimately contributing to stable and smooth wear responses even under prolong friction. However, the formation of an oil-in-water emulsion, caused by the buoyancy effect, destroyed the oil films on the worn NPWM surface in a water environment, resulting in higher coefficients of friction (COFs) under water conditions than under dry friction, even after the fluorination-soaking treatment. The knowledge gained herein could not only verify the potential of NPWM as an excellent oil-impregnated material in the engineering field but also provide a new methodology for the design of artificial porous materials with stable and smooth friction processes.
研究领域:
材料科学
·
生物学
·
摩擦学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2024
·
IF 5.2
Xiaocao Cao,Yaowei Hao,Jiafan Zheng,Haodong Wang,Zhiguang Lin,Yafang Zhao,Jiayi Liu,Ming Zhang,Zhongrong Shen
Ruddlesden–Popper (R-P) perovskite oxides have attracted much attention as highly active and stable bifunctional materials for the oxygen evolution reaction (OER)/oxygen reduction reaction (ORR) in alkaline solutions due to the nonuse of precious metal elements. Herein, a triple (H+, O2–, and electron) conductive R-P perovskite oxide, La1.2Sr0.8Ni0.6Fe0.4O4+δ, was prepared, and the valence state of transition metal cations and highly oxidized oxygen (O–/O22–) in the structure was tuned by a low-temperature fluorine substitution treatment. The homogeneous distribution of the fluorine elements across the particles of the R-P perovskite oxide after its fluorination was confirmed by high-resolution transmission electron microscopy (HRTEM) images. By regulation of the amount of highly oxidative state oxygen species and the valence state of transition metal cations in the R-P perovskite structure, the material exhibits a significant enhancement for both the OER and ORR electrocatalytic activities. The fluoridated La1.2Sr0.8Ni0.6Fe0.4O4+δFy (LSNF-OF) achieves a low OER overpotential of 308.1 mV in a 1 M KOH electrolyte at a current density of 10 mA cm–2. This is superior to both commercial Co3O4 and the pristine sample without fluorination. The LSNF-OF electrode in an aqueous Zn-air battery (ZAB) exhibits a peak power density of 19.15 W g–1 at a current density of 24 mA g–1. The low-temperature trace fluorination can enhance the electrocatalytic efficiency of perovskite oxides. This technique can be applied to various types of metal oxides.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）