Surface Topography-Metrology and Properties
·
2022
·Vol. 10
·期 4
·045020
·
IF 2.185
Bo Lin,Wan-Yi Chen,Kwok-Ho Lam,Na Shi,Bo Shi,Ying Yang,Yu-Ma Yang,Fu-An He,Li-Wang Jiang
A fluorine-free strategy was developed for the hydrophobic modification of the melamine (MA) sponge, in which both the stearic acid-modified Fe3O4 nanoparticles (SA-Fe3O4) and the graphite oxide were immobilized on the MA sponge with the use of 3-aminopropyltriethoxysilane by a drop-coating method to prepare the SA-Fe3O4/GO/MA sponge for oil-water separation. The structure of the SA-Fe3O4/GO/MA sponge was investigated by FITR, WAXD, SEM, two-dimensional EDS mapping, TGA, and VSM. The contact angles of the SA-Fe3O4/GO/MA sponge prepared with different amounts of SA-Fe3O4 and GO were in the range of 140.2° − 145.0°, which confirmed the successful hydrophobic surface modification for the MA sponge. The demonstrations exhibited that the SA-Fe3O4/GO/MA sponge could separate the oil from the oil-water mixture by both direct absorption and gravity-driven filtration. Additionally, the SA-Fe3O4/GO/MA sponge possessed not only high absorption capacities for peanut oil, n-hexane, soybean oil, and diesel oil, but also good abilities of being able to recollect magnetically and reuse. The proposed preparation strategy and overall performance of SA-Fe3O4/GO/MA sponge were promising for the oil-water separation in the future.
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Xin Liu,Jihui Wang,Wenbin Hu
The hollow Fe 3 O 4 microspheres were firstly synthesized by solvothermal method. And then Fe 3 O 4 /MBT nanocomposite inhibitor was obtained by loading 2-mercaptobenzothiazole (MBT) inhibitor under negative vacuum impregnation treatment and characterized using transmission electron microscopy , X-ray diffraction, Fourier transform infrared spectroscopy , nitrogen adsorption-desorption isotherms and vibrating sample magnetometer . The release behavior of MBT and inhibition behavior of Fe 3 O 4 /MBT nanocomposite under different magnetic field (MF) strength were evaluated by UV–vis spectroscopy, electrochemical techniques and immersion tests. The results show that the synthesized superparamagnetic Fe 3 O 4 /MBT nanocomposite shows high MBT loading capacity of 55.4 %. Under the application of MF, the release behavior of MBT from Fe 3 O 4 /MBT is dominated by Fickian diffusion and diffusion among magnetic nanoparticles , and the release rate and inhibition efficiency are less than that of without MF under the same release time. The nanocomposite has a good inhibition effect for carbon steel in NaCl solution with maximum inhibition efficiency of 95.7 %, and also possesses excellent recycling stability with loading capacity of 45.1 % and inhibition efficiency of 78.8 % after five cycles.
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DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2019
·
IF 6.864
Yanfei Li,Yuanyuan Fu,Shouhui Chen,Zhenzhong Huang,Li Wang,Yonghai Song
A rapid and simple way to prepare porous Fe 2 O 3 /Fe 3 O 4 @carbon octahedron arrayed on three-dimensional graphene foam (Fe 2 O 3 /Fe 3 O 4 @C/G) nanocomposites was developed. Firstly, Fe-metal organic frameworks (MOFs)/graphene oxide (GO) precursor was fabricated by growing octahedral Fe-MOFs on the surface of GO and then the as-prepared Fe-MOFs/GO was rapidly transformed into porous Fe 2 O 3 /Fe 3 O 4 @C/G by combusting the mixture of precursors and triethylamine (TEA) in air. In the combustion process, GO was reduced and connected each other into N-doped G foam, and Fe-MOFs were transformed into porous Fe 2 O 3 /Fe 3 O 4 @C octahedron and arrayed on G foam. The porous structure, porous carbon and G foam relieved the volume expansion of Fe 2 O 3 /Fe 3 O 4 nanoparticles , and enhanced electrical conductivity of nanocomposites. The as-prepared Fe 2 O 3 /Fe 3 O 4 @C/G showed a high discharge capacity (1210 mAh g −1 , 200 cycles) and long cycle life (5 A g −1 , 400 cycles) when was applied to lithium-ion batteries. This work to prepare Fe 2 O 3 /Fe 3 O 4 @C/G nanocomposites through the combustion of TEA and Fe-MOFs/GO could save energy, achieve rapid preparation and shorten the reaction time. It might provide an original way for fabrication of transition metal oxides@C derived from MOFs and a constructive view into the preparation of composite materials.
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高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2015
·Vol. 15
·期 6
·4608-4618
·
IF 1.556
Cui Qinmin,Zhu Shudi,Yan Yingjie,Ye Quanlin,Ziener Ulrich,Cao Zhihai
In the present study, superparamagnetic Fe3O4/poly(N-isopropyl acrylamide) nanocomposites were synthesized by one-step inverse miniemulsion copolymerization of N-isopropyl acrylamide and N,N'-methylene diacrylamide. The loading of Fe3O4 nanoparticles
in the nanocomposites was 27 wt%, and the saturation moment of the nanocomposites was 12.4 emu · g−1. Fe3O4 nanoparticles were prepared through a coprecipitation method. The amount of stabilizer (poly(acrylic acid)) significantly influenced the
size and size distribution of the Fe3O4 nanoparticles, and, therefore, their magnetic properties. Superparamagnetism of the Fe3O4 nanoparticles was preserved in the nanocomposites. The effects of synthetic parameters on the particle properties, namely
surfactant loading, concentration of ferrofluid, type of lipophobe and initiator, and amount of cross-linker were investigated. Nanocomposites of Fe3O4/poly(N-isopropyl acrylamide) displayed a guava-like morphology, which they could retain after being redispersed
in polar solvents.
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DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Shaoxi Zhang,Xiangnan Chen,Zhiyong Zhang,Xiaolong Song,Guangjun Gou
Nowadays, the practical application of electromagnetic absorbing materials required lightweight, high efficiency and especially broadband. Wherein, graphene-based electromagnetic absorbing materials had received extensive attention. The conventional design was to introduce magnetic particles onto graphene, but often lead to narrow bandwidth, hard to regulate, due to the lack of intrinsic coupling between magnetic particles and dielectric graphene. In principle, defect engineering could induce intrinsic ferromagnetism into graphene while increasing dielectric polarization loss, could be an effective means of expanding and regulating electromagnetic absorbing bands. Thus, in this paper, Cu/Fe 3 O 4 heterogeneous nanospheres was constructed onsite defect-rich graphene to realize broadband electromagnetic absorbing modulation. The optimal RL value of Cu/Fe 3 O 4 /GE could reach −45.5 dB with obvious multi-band absorption, which was mainly attributed to the synergistic enhancement of defect-induced polarization loss, multiple interfacial polarization loss, as well as collaborative multipath magnetic loss. This work provides reference way for lightweight multi-band electromagnetic absorbing materials design.
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DOI
高影响因子
Polymer Chemistry
·
2014
·Vol. 5
·期 14
·4332-4338
·
IF 5.368
Feng Wang,Liyan Huang,Jun Li,Lina Lin,Zhengping Liu,Zhaoxia Dong
Well-defined superparamagnetic and conductive Fe3O4/polyaniline (PANI) hollow spheres were fabricated using positively charged polystyrene (PS) spheres as templates. The negatively charged Fe3O4 particles, which were decorated by citric acid, can be attached onto the surface of the PS spheres via electrostatic interaction. Subsequently, the PANI layer was coated onto the PS/Fe3O4 templates by in situ chemical oxidative polymerization. Finally, removal of the PS core by dissolving with tetrahydrofuran provided the electromagnetic hollow spheres. Morphologies and compositions of Fe3O4/PANI hollow spheres were investigated by using SEM, TEM, FTIR and XRD. Magnetic analysis demonstrates that the synthesized composite spheres possess the characteristic of superparamagnetism and the saturation magnetization value is 26.2 emu g−1. Batch adsorption shows that the Fe3O4/PANI hollow spheres exhibit high uptake property of Pb2+ in aqueous solution. The adsorption kinetics follows the mechanism of pseudo-second-order kinetics and the sorption agrees well with the Langmuir isotherm.
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DOI
高影响因子
ECS Journal of Solid State Science and Technology
·
2020
·Vol. 9
·期 12
·123007
·
IF 2.142
Guodong Zhang,Jiaqi Chen,Yao Liu
Iron-based soft magnetic composites (SMCs) were prepared by two-step ball milling with sodium silicate and ferroferric oxide. The presence of the precoated silicate layer has increased the resistivity of the powder surface, which also improved the agglomeration of ferroferric oxide. The addition of magnetic ferroferric oxide improves the dilution effect. Combining the advantages of both sodium silicate and ferroferric oxide, the prepared soft magnetic composite material has excellent performance. After annealing at 400 °C, the core loss is 214.5 W Kg−1 (1 T, 1000 Hz), and the saturation magnetic induction is 1.33 T.
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DOI
高影响因子
Corrosion Communications
·
2022
·
IF 0
Jinke Wang,Shanghao Wu,Lingwei Ma,Bing Zhao,Haowen Xu,Xiaolun Ding,Dawei Zhang
This work synthesized novel Fe 3 O 4 nanoparticles loaded with 2-mercaptobenzothiazole corrosion inhibitors (Fe 3 O 4 -MBT NPs), which possessed not only photothermal conversion property but also corrosion inhibition ability. The loading percentage of MBT inhibitors in the Fe 3 O 4 -MBT NPs was 9.69 wt.%. The obtained Fe 3 O 4 -MBT NPs were incorporated into a shape memory epoxy coating to achieve passive protection and self-healing property. The passive protection property of intact Fe 3 O 4 -MBT/epoxy coating was assessed using electrochemical impedance spectroscopy (EIS) measurement during immersion in 3.5 wt.% NaCl solution. The low-frequency impedance modulus at 0.01 Hz of the composite coating containing 3 wt.% Fe 3 O 4 -MBT NPs was approximately 5 times higher than that of the blank epoxy coating after 240 h of immersion, indicating the superior barrier property of the composite coating. As for the self-healing property, the scratch width on the coating surface could narrow from 80 µm to ∼5 µm after near-infrared (NIR) light irradiation for 30 s, which was ascribed to the excellent photothermal conversion property of Fe 3 O 4 NPs. EIS results verified that both the scratch closure triggered by the photothermal conversion of Fe 3 O 4 NP and the release of MBT inhibitors are beneficial for the suppression of corrosion activity within the coating scratch. The Fe 3 O 4 -MBT/epoxy coating with outstanding passive protection and self-healing property holds great potential to achieve long-term corrosion protection.
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DOI
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Zhen Wang,Zhi Cheng,Li Xie,Xianliang Hou,Changqing Fang
Ti 3 C 2 T x MXene has been explored as an efficient electromagnetic interference (EMI) shielding material because of its high electrical conductivity , large specific surface area, rich surface defects , and abundant functional groups. Herein, core-shell Fe 3 O 4 @PANI composites were prepared, followed by the preparation of a flexible and lightweight Ti 3 C 2 T x /Fe 3 O 4 @PANI composite film with sandwich intercalation structure by vacuum-assisted filtration, using Ti 3 C 2 T x MXene as a matrix material. The ultrathin composite film with a Ti 3 C 2 T x nanosheets to Fe 3 O 4 @PANI weight ratio of 12:5 reached a maximum EMI shielding effectiveness (SE) value of 58.8 dB at a thickness of only 12.1 μm. This is much higher than the SE of pure conductive Ti 3 C 2 T x films of the same thickness. After adjusting the film thickness by increasing the concentration of Ti 3 C 2 T x , an SE of 62 dB was achieved at a thickness of 16.7 μm. The ultrathin Ti 3 C 2 T x /Fe 3 O 4 @PANI films exhibit potential for application in packaging, wearable electronic equipment, and military fields. Moreover, they provide insight into the preparation of lightweight and progressive electromagnetic shielding materials.
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高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Hui Huang,Bin Huang,Yichun Huang,Jinbei Yang,Yinnv Ye,Yucheng Chen
Attractive environmentally friendly magnetic metal-organic framework (MOF) nanocomposite GO@Fe 3 O 4 -COOH@NH 2 -MIL-101(Fe) was synthesized by a solvothermal method and characterized by X-ray diffraction, Fourier transform infrared, scanning electron microscopy, Brunauer– Emmett–Teller, and vibrating sample magnetometer, and used as an effective adsorbent for the removal of orange G from aqueous solution. The various operating parameters that effect the adsorption process, such as adsorbent dosage (0.01–0.2 g), pH (1.0–10.0), initial concentration (50–400 mg L –1 ), and temperature (298.15–318.15 K) were studied. The percent removal of orange G increases with the increment of the adsorbent dosage and decrease of the initial concentration, and the optimum pH is 6.0. The Redlich–Peterson model can be favorably applied to describe the adsorption equilibrium data, indicating that the surfaces of GO@Fe 3 O 4 -COOH@NH 2 -MIL-101(Fe) nanocomposite for the orange G adsorption are made up of homogeneous adsorption patches. The adsorption kinetics indicate that the adsorption process of GO@Fe 3 O 4 -COOH@NH 2 -MIL-101(Fe) toward orange G obeys the pseudo-second-order model and the activation energy is 16.5 kJ mol –1 . Thermodynamic parameters, ΔH = 39.81 kJ mol –1 , ΔS = –46.80 J mol –1 K –1 , and ΔG < 0, exhibit that the adsorption is exothermic and spontaneous. The maximum adsorption capacity of orange G onto GO@Fe 3 O 4 -COOH@NH 2 -MIL-101(Fe) nanocomposite is 128.8 mg g –1 . Therefore, magnetic GO@ Fe 3 O 4 -COOH@NH 2 -MIL-101(Fe) nanocomposite can be employed as an environmentally friendly and efficient adsorbent for the orange G removal from wastewater.
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高影响因子
JOURNAL OF ENVIRONMENTAL ENGINEERING
·
2020
·Vol. 146
·期 7
·04020056
·
IF 1.264
Hao Cai,Tianci Zhao,Zichuan Ma,Jingze Liu
Fe3O4-coated pretreated biochars (Fe3O4@PBC) were prepared for the first time by a Fe(III)-ethanol solution impregnation-calcination method. When photo-Fenton catalysts were used, their effectiveness in removing metronidazole (MNZ) from aqueous media was evaluated. Fe3O4@PBC samples were characterized by X-ray diffraction, scanning electron microscope, vibrating sample magnetometer, X-ray photoelectron spectroscopy, and Brunauer–Emmett–Teller methods. The results showed that Fe3O4 coating was successfully formed on the surface of HNO3- pretreated biochar, and Fe3O4@PBC can be separated by applying an external magnetic field. The coating of Fe3O4 did not change the pore structure and maintained a high surface area of the biochar. Fe loading significantly affected the photo-Fenton degradation and adsorption ability of MNZ. The highest MNZ removal rate and the greatest catalytic ability were found in the PBC-6.6Fe sample containing 6.6% Fe by mass. Various operating parameters, such as solution pH, H2O2 concentration, and MNZ concentration, were tested during MNZ’s photo-Fenton catalytic degradation. The results indicate that the highest MNZ degradation efficiency can be derived from a moderate acidic solution, and the optimal pH is 3. Using PBC-6.6Fe, the increase of H2O2 concentration from 30 to 60 mmol·L−1 promotes the degradation of photo-Fenton, and both an excessive H2O2 and an increase in MNZ concentration suppressed the process. Under the conditions of 0.4 g·L−1 PBC-6.6Fe, 300 mg·L−1 MNZ, 60 mmol·L−1 H2O2, and initial pH of 3, 95.1% of MNZ was degraded. The PBC-6.6Fe had good stability, and its removal efficiency was still over 92% after five repeated uses. This study confirmed that •OH played a dominant role, while O2•− and h+ played a weaker role in the photo-Fenton system. The results indicated that Fe3O4@PBC served as a prospective visible-light-driven catalyst similar to Fenton for the treatment of wastewater containing MNZ.
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DOI
高影响因子
Nano Today
·
2025
·
IF 10.9
Kecheng Quan,Yupu Lu,Ting Zhang,Shuren Wang,Hao Tang,Chunhao Yu,Yongsheng Zhou,Yunsong Liu,Dandan Xia,Yufeng Zheng
Antimicrobial coatings with the capabilities to prevent and treat biofilm infections on implant are promising surface treatment strategies, but it is difficult to eradicate an already-formed biofilm by the coating. Magnetically-drivable coatings can physically destruct the surface-attached biofilm to enhance antimicrobial killing. However, current magnetic coatings cannot inhibit the initial bacteria growth and the demand of coating stability restricts their magnetic controllability. Herein, a magnetically-drivable, pH-responsive coating is developed by simply mixing Fe 3 O 4 and ZIF-8 nanoparticles on titanium surface. In physiological pH, Fe 3 O 4 nanoparticles are stable and non-magnetically drivable on surface due to charge attractions and electrostatic interactions. While in acidic pH caused by bacterial growth, ZIF-8 degradation is significantly accelerated, releasing Zn 2 + and recovering the magnetic controllability of Fe 3 O 4 nanoparticles. The released Zn 2+ kills the initially-attached bacteria, inhibiting subsequent biofilm formation. Once a biofilm has formed, Fe 3 O 4 nanoparticles can be magnetically pulled-off to destruct the biofilm structure and then enhance antibiotic killing. The Fe 3 O 4 /ZIF-8 coating shows excellent biocompatibility and osteogenesis to compare with bare Ti disc. Animal experiments further proved the in-vivo antimicrobial and osteogenic performances of the coating. Therefore, this work put forward a new surface strategy to solve biofilm-related infections on implants.
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