RSC Advances
·
2016
·Vol. 6
·期 115
·113933-113939
·
IF 3.289
Hongmei Liu,Yandong Xie,Yafei Zhang,Yifan Cai,Baiyang Li,Honglin Mao,Rutong Yu
Fe3O4 nanoparticles (NPs) have attracted a great deal of attention due to their magnetic properties, low toxicity, high surface area and their small sizes. Owning to the low toxicity, easy separation and controlled NPs size, in this study Fe3O4 NPs have been used for co-delivery two anticancer drugs for combination tumor therapy. We used doxorubicin (DOX) prodrugs and DSPE-PEG5000 to coat Fe3O4 NPs to form DOX–Fe3O4 NPs. The hydrophobic anticancer drug combretastatin A-4 (CA4) was loaded into DOX–Fe3O4 NPs to form DOX–CA4–Fe3O4 NPs. It was proved that the obtained DOX–CA4–Fe3O4 NPs with an average diameter around 53.7 ± 5.25 nm could accumulate effectively in tumors by an enhanced permeability and retention (EPR) effect. After intravenous injection, the DOX–CA4–Fe3O4 NPs were found to selectively accumulate at the tumor site and killed the cancer cells in a combinatorial way. The results indicate that the DOX–CA4–Fe3O4 NPs can be potentially applied as a safe and efficient two anticancer drugs delivery carrier.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2016
·Vol. 28
·期 3
·2769-2774
·
IF 1.798
Yu Qi,Chen Hanlin,Chen Ping,Wang Qi,Lu Chun,Jia Caixia
Carbon nanofibers containing Fe 3 O 4 nanoparticles (Fe 3 O 4 @C nanofibers) were synthesized by electrospinning technique followed by heat treatment, and then the as-prepared nanofibers were loaded in bismaleimide (BMI) resin to prepare nanocomposites. The phase structure and morphology of nanofibers were characterized by X-ray diffraction and scanning electron microscope, respectively. The complex permittivity and permeability of nanocomposites were measured by vector network analyzer using a coaxial line method in the frequency range of 1–18 GHz, and the microwave absorption performance was accordingly evaluated. The results indicated that the Fe 3 O 4 @C nanofibers/BMI composites showed excellent low-frequency electromagnetic wave absorption properties with a minimum RL value of −22 dB at 2.1 GHz corresponding to a thickness of 6 mm and exceeding −10 dB with thickness of 3–6 mm in the whole S band (2–4 GHz). The strong absorption in low frequency is attributed to good matching characteristics of dielectric loss and magnetic loss, which can be efficiently tailored by combination of magnetic Fe 3 O 4 and dielectric carbon layer through electrospining technology. The novel Fe 3 O 4 @C nanofibers loaded in BMI resin can provide an effective solution for pressing problem in present that how to produce lightweight microwave absorbing nanocomposites with excellent low-frequency electromagnetic absorption properties.
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NANOTECHNOLOGY
·
2024
·Vol. 35
·期 46
·465601
·
IF 2.9
Wei Yang,Site Luo,Yang He,Han Wang,Haihu Yu
Amorphous arrays assembled from colloidal microspheres are a way that obtains angle-independent structural colors. In order to obtain additional properties, colloidal microspheres, which are constituent units, can be modified with other materials. Here, we utilized the silane-functionalized carbon quantum dots (SiCDs) by incorporating them into the Stöber reaction to fabricate Fe3O4@SiO2/SiCDs nanospheres with a core–shell structure. Amorphous colloidal arrays (ACAs) were constructed on commercial printing paper using Fe3O4@SiO2/SiCDs nanoparticles as structural units by a simple permeation assembly. Macroscopically, the prepared ACAs exhibit the magnetic properties of Fe3O4, while under sunlight, they display bright, angle-independent structural colors. Under ultraviolet light, the array shows significant fluorescence. This enables the presentation of multidimensional information under varying magnetic and lighting conditions. By adjusting the thickness of the outer SiO2/SiCDs composite layer, the optical properties and magnetism can be controlled easily. Moreover, due to the strong light absorption capability and high refractive index of Fe3O4, the digital patterns constructed with Fe3O4@SiO2/SiCDs nanospheres demonstrate excellent multi-level anti-counterfeiting characteristics, even under water exposure. The magnetic properties of Fe3O4@SiO2/SiCDs nanospheres, along with their distinct display characteristics under different optical environments, suggest their wide applicability in the fields of multifunctional anti-counterfeiting pigments, bioimaging, and sensing displays.
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ACS Applied Nano Materials
·
2025
·
IF 5.5
Longxin Wang,Yishan Wang,Dongdong Liu,Yao Wang,Xuji Zhang,Guangwu Wen,Xueqian Zhang,Xiaoxiao Huang
The application of heterostructures and complex morphology has been favored by researchers of electromagnetic wave-absorbing materials. Herein, Fe3O4/Fe2O3/C composites with carbon-coated octahedral structures were prepared and obtained using a polymer self-assembly-guided nonhomogeneous structure engineering strategy to form hierarchical polyhedral structures (200–400 nm in size). The electrostatic attraction of anionic polyacrylamide (APAM) is used to chelate Fe3+. Due to the synergistic effect of intermolecular forces, APAM can be used as a “bridge” to connect multiple micellar particles, and this bridging and entanglement effect facilitates the formation of octahedral Fe3O4/Fe2O3. Compared with nanoparticles, the octahedral structure easily forms a conductive network, and the presence of sharp corners can effectively promote the concentration of charge, promote polarization loss, and extend the reflection and scattering path. Through the high-temperature reduction of APAM, the conversion of part of Fe2O3 to Fe3O4 is realized, which effectively improves the electromagnetic parameters and thus optimizes the impedance matching. Meanwhile, the synergistic effect between the magnetic loss (ferromagnetic resonance) of Fe3O4 and the dielectric loss (interfacial polarization, dipole polarization, and conduction loss) of Fe3O4/Fe2O3/C enhances the absorption of electromagnetic waves. Unsurprisingly, the synthesized Fe3O4/Fe2O3/C composites exhibit excellent EMW absorption performance, with a reflection loss of up to −34.7 dB at 30% paraffin filler ratio and an effective absorption bandwidth (EAB) of 8.64 GHz at 1–3 mm.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2024
·
IF 6.3
Zebo Wu,Dan Liu,Wenhao Wang,Hongtong Xie,Xianghui Chen,Huibin Yin
Magnetized wood (M–W) has been proposed to be used as an absorber in solar-driven interfacial evaporation. The M−W could gain an evaporation rate of 1.46 kg m −2 h −1 under the combined effect of sunlight and magnetic fields, which is 27 % higher than carbonized wood (C–W). To explore the mechanism, they were subjected to SEM, XPS, and water contact angle tests. It is revealing that M−W forms much more microchannels for steam diffusion. The M−W shows 97 % optical absorption within the whole wavelength, while the C–W is lower than 85 %, revealing the M−W can gather most of the solar radiation. Finally, the permeability coefficients of carbonized and magnetized woods are calculated by the CFD model. The permeability coefficient of the M−W is 20 % higher than the C–W, which can be attributed to Fe 3 O 4 nanoparticles disturbing the steam growth in the magnetic field, hence decreasing the thickness of the liquid film covering the bubbles and improving the solar evaporation rate.
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Materials
·
2017
·Vol. 10
·期 11
·1239
·
IF 2.654
Bing Yu,Liang He,Yifan Wang,Hailin Cong
Magnetic porous microspheres are widely used in modern wastewater treatment technology due to their simple and quick dye adsorption and separation functions. In this article, we prepared porous polymethylmethacrylate (PMMA) microspheres by the seed-swelling method, followed by in situ formation of iron oxide (Fe3O4) nanoparticles within the pore. Then, we used diazo-resin (DR) to encapsulate the porous magnetic microspheres and achieve PMMA@Fe3O4@DR magnetic material. We studied the different properties of magnetic microspheres by different dye adsorption experiments before and after the encapsulation and demonstrated that the PMMA@Fe3O4@DR microspheres can be successfully used as a reusable absorbent for fast and easy removal of anionic and aromatic dyes from wastewater and can maintain excellent magnetic and adsorption properties in harsh environments.Keywords:poly (methylmethacrylate) (PMMA);magnetic;diazo-resin (DR);adsorption;dye
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 134
·期 48
·45566
·
IF 1.86
Yanhu Zhan,Yanyan Meng,Ning Yan,Yuchao Li,Denghu Wei,Xuquan Tao
Graphene hybrid aerogels have attracted attention as electrode materials because of their unique porous architectures. However, their electrochemical performance is limited by the intrinsic hydrophobicity and the ease of aggregation of graphene nanosheets. We demonstrate a unique methodology to produce graphene hybrid aerogels through assembly of graphene nanosheets, nanometer-scale ferroferric oxide (Fe 3 O 4 ), and hydrophilic poly(vinyl alcohol) (PVA) into three-dimensional hierarchical macrostructures. Electrochemical performance measurements exhibit a significant improvement in the specific capacitance of this ternary hybrid aerogel with remarkable cycling stability. Specifically, the specific capacitance is nearly 6.6 times higher than that of the neat graphene aerogel, and a cycling capacitance retention rate of 99% was achieved after 2000 cycles at a high current density of 0.5 A g −1 . Electrochemical impedance spectroscopy measurements demonstrate a lower resistance in the Fe 3 O 4 /graphene/PVA aerogel electrode compared with that of both neat graphene and Fe 3 O 4 /graphene aerogel electrodes. The obtained graphene hybrid aerogels with outstanding cycling performance and high energy density are very promising as electrode materials for supercapacitors. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 45566.
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CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Dengkun Shu,Xingyu Long,Pengju Zhao,Lang Wang,Zhenhua Li,Chunzu Cheng,Shuo Yang,Long Jiao,Peng Xi,Lei Xia,Chenyang Li,Bowen Cheng
Oil pollution in water has destructive effect on the ecological environment of water bodies. However, the treatments for oil pollution underwater in irregularly shaped and non-open environments face a challenge owing to the difficulty in driving oil absorption materials underwater. Herein, this work reports a facile strategy to prepare flash spinning magnetic polyethylene fibers (FSMPFs) for oil absorption application in irregularly shaped and non-open underwater environments. The as-prepared FSMPFs exhibit good oil absorption performance, of which the oil absorption in air and underwater is 76.70 g/g and 65.32 g/g, respectively, and the FSMPFs can maintain their oil absorption performance in environments with different salinities (1–5 %) and pH values (2–12). Also, the FSMPFs show good magnetic responsiveness and controllability when applied to oil–water separation underwater in irregularly shaped pipes, and the oil–water separation efficiency of FSMPFs for oil–water emulsion reaches 99.6 %. Besides, the FSMPFs have good mechanical properties and reusability, of which the tensile strength and elongation at break is 185.9 cN and 41.2 %, respectively, and oil absorption is 76.28 g/g (99.5 % of the initial value) after 10 cycles of absorption–desorption. The FSMPFs have great potential in practical applications for oil absorption under irregularly shaped and non-open environments.
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Chemical Engineering and Processing-Process Intensification
·
2024
·
IF 3.8
Mingxin Li,Wensheng Wang,Cong Xu
Conventional batch reactors are difficult to fabricate high-quality superparamagnetic Fe 3 O 4 nanoparticles at high throughput due to their high energy consumption and low mixing efficiency. We designed a four-stage oscillating feedback micromixer (FOFM) to achieve efficient mixing and mass transfer at high throughput. The FOFM can induce strong chaotic convection, resulting in a uniform concentration field and a narrow residence time distribution. High-quality superparamagnetic Fe 3 O 4 nanoparticles were successfully synthesized in the FOFM using a microemulsion method. Even at a high throughput of 155 mL/min ( Q total ), the synthesized Fe 3 O 4 nanoparticles had an average particle size of 8.98 nm, a particle size distribution of 3–18 nm, and a saturation magnetization of 66 emu/g, and the productivity could reach 63.2 g/h which was three times higher than that of the conventional batch reactor. The FOFM has been proven to have great application potential in the synthesis of high-throughput and high-quality nanoparticles.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Renpeng Yang,Xiaogang Yu,Chengxiong Wei,Chengwei Wu,Wei Zhang
The poor photothermal performance of Fe 3 O 4 magnetic particles under 808 nm near-infrared laser inevitably limits their application in the field of photothermal therapy for tumor. Herein, Fe 3 O 4 clusters with a mean size of 239.1 nm were synthesized by solvothermal method and thermal treatment at 400℃. Compared with the reported Fe 3 O 4 materials, the developed clusters exhibit high extinction coefficient of 7.88 L/(g∙cm) and the highest photothermal conversion efficiency of 51.1 %, for which thermal treatment plays a key role. Due to the introduction of thermal treatment, the increased grain size and decreased grain distance can enhance the Fe 3+ magnetic coupling and thus improve the extinction ability, while the defects caused by high temperature can trigger more electron traps to promote electron non-radiative relaxation and translate into more thermal energy. The measurements of coercivity (10.6 Oe to 67.3 Oe), blocking temperature (382.3 K to over 400 K) and Urbach energy (0.461 eV to 0.692 eV) before and after thermal treatment support this explanation. The in vitro and in vivo photothermal experiments show that the Fe 3 O 4 clusters can kill tumor cells and inhibit tumor growth through the conversion of laser energy into thermal energy.
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ACS Applied Nano Materials
·
2024
·
IF 5.3
Hangyu Luo,Xiaofeng Liu,Zhenbang Meng,Han Wang,Qi He,Ri Chen,Wenxia Wang
Antibacterial micromotors with intriguing properties have represented frontiers of research in the biomedical and environmental fields. While single-powered micromotors still encounter some challenges for efficient propulsion in an intricate biological environment, herein, dual-propelled Fe3O4/BiOI/Ag (FBA) micromotors with hollow structure were synthesized via two facile steps without involving any sophisticated equipment. In this unique design, efficient propulsion of an FBA micromotor powered by magnetic stimuli/visible light was demonstrated. Impressively, the micromotor was capable of flexible propulsion with a remarkable velocity of 119.2 ± 5.9 μm s–1 without addition of toxic fuel. Taking advantage of the locomotion, bacterial capture ability, and photocatalytic capacity, 1 × 107 CFU mL–1 Escherichia coli (E. coli) can be totally inactivated by hollow FBA micromotors. The ideal universality of FBA for antibacterial application toward Staphylococcus aureus (S. aureus) and Pseudomonas aeruginosa (P. aeruginosa) was confirmed. Besides, the FBA micromotors manifested antibiofilm capacity toward E. coli, methicillin-resistant S. aureus (MRSA), and P. aeruginosa. It is worth mentioning that they also displayed ideal biocompatibility and lower toxicity. More importantly, the FBA micromotors can effectively accelerate S. aureus-infected wound healing without causing adverse effects. This work offers an innovative strategy for facile design of dual-propelled micromotors for various environmental and biomedical applications.
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Materials
·
2024
·Vol. 17
·期 15
·3773
·
IF 3.1
Zhu Liu,Yufu Zheng,Lizhong Lin,Xiaofei Liu,Na Qiang
Electrospinning technology is widely used for preparing biological tissue engineering scaffolds because of its advantages of simple preparation, accurate process parameters, and easy control. Poly(L-lactide) (PLLA) is regarded as a promising biomass-based polymer for use in electrospinning. The incorporation of Fe3O4nanoparticles (NPs) could improve the osteogenic differentiation and proliferation of cells in the presence or absence of a static magnetic field (SMF). In this work, these two materials were blended together to obtain electrospun samples with better dispersibility and improved magnetic properties. First, composite PLLA and Fe3O4NP fibers were prepared by means of electrospinning. The influence of electrospinning conditions on the morphology of the composite fibers was then discussed. Changes in magnetic properties and thermal stability resulting from the use of different PLLA/Fe3O4mass ratios were also considered. Next, the morphology, crystal state, thermodynamic properties, and magnetic properties of the electrospun samples were determined using scanning electron microscopy (SEM), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and vibration sample magnetization (VSM). The results showed that the fibers prepared using PLLA withMn= 170,000 exhibited good morphology when electrospun at 12 KV. The magnetic properties of PLLA/Fe3O4composite electrospun fibers increased with the NP content, with the exception of thermal stability. The results of the present study may help to promote the further development of PLLA/Fe3O4composite materials in the biomedical field.
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