MACROMOLECULAR RAPID COMMUNICATIONS
·
2020
·Vol. 41
·期 17
·2000307
·
IF 4.886
Kesong Tian,Junyan Wang,Wanchun Guo,Ruifei Li,Ling Cao,Zhaopeng Xu,Haiyan Wang
Yolk–shell magnetic nanoparticles@nitrogen-enriched Carbon nanostructures with a magnetic core and a hollow nitrogen-enriched carbon shell exhibit considerable promise in various applications, such as drug delivery, heterogenous catalysts, removal of metal ions and organic pollutants, and screening of biomolecules, due to their strong magnetic response, unique cavities, and the selective absorption ability of nitrogen-enriched groups. However, their complicated synthesis always involves possible surface modification, layer-by-layer deposition of a sacrificial middle layer and an outer nitrogen-enriched layer on magnetic nanoparticles, subsequent carbonization, and final removal of the sacrificial middle layer. Herein, yolk–shell Fe 3 O 4 @nitrogen-enriched carbon nanostructures are constructed based on NH 4 + ion-induced one-step deposition of SiO 2 and Resorcinol-3-aminophenol-formaldehyde cocondensed resin (R-APF) dual layers onto poly acrylic acid-modified Fe 3 O 4 nanoclusters without any extra surface modification. The N-Carbon shell thickness of the yolk–shell Fe 3 O 4 @Void@N-Carbon nanostructure can be finely tailored though tailoring the feeding amount of aminophenol and resorcinol to tune the thickness of the outer R-APF resin shell onto Fe 3 O 4 @SiO 2 intermediate particles. This NH 4 + ion-induced one-pot deposition of double layers can effectively promote synthesis efficiency of this kind of yolk–shell nanostructure.
研究领域:
材料科学
·
化学工程
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Desalination and Water Treatment
·
2014
·
IF 0.987
Shuhua Zhong,Huaili Sha,Yu He,Gongwu Song
In this work, tobermorite/SiO2/Fe3O4 composites were designed and synthesized by hydrothermal method for the treatment of phosphorus in wastewater. The composites were characterized by scanning electron microscopy and X-ray diffraction. The removal efficiency of phosphorus on the tobermorite/SiO2/Fe3O4 composites was carried out and investigated under various conditions, such as contact time, sorbent content, and pH. After the multi-run experiments, the phosphorous elimination of the tobermorite/SiO2/Fe3O4 composites was declined slightly comparing with the first-run experiments. Compared with the conventional crystallization methods, tobermorite/SiO2/Fe3O4 composites not only gave high efficiency to remove phosphorus from wastewater without any complicated pretreatment, but also provided excellent magnetic properties for separating the phosphorus from water, which made it easy recycled. Moreover, tobermorite/SiO2/Fe3O4 composites had excellent P-elimination properties even in the strong acidic or basic conditions. Therefore, tobermorite/SiO2/Fe3O4 composites were important candidate for water quality control and protection.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2019
·Vol. 9
·期 2
·141
·
IF 4.034
Guangzhen Cui,Yanli Lu,Wei Zhou,Xuliang Lv,Jiangnan Hu,Guoyu Zhang,Guangxin Gu
Magnetic nanoparticles, such as Fe3O4and Co3O4, play a vital role in the research on advanced microwave absorbing materials, even if problems such as high density and narrow band impedance matching are still unsolved. Herein, the study of lightweight hollow Fe3O4@reduced graphite oxide (RGO) nanocomposites synthesized via the solvothermal method is presented. The microstructure and crystal morphology of the materials were characterized by X-ray diffractometer (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) analyses. Single crystalline hollow Fe3O4spheres were grown onto RGO flakes, leading to the formation of heterojunction, which further influenced the microwave absorption properties. The latter were evaluated by standard microwave characterization in the frequency range of 2–18 GHz. It was found that, for a specific Fe3O4@0.125 g RGO composite, the minimum reflection loss can reach −41.89 dB at 6.7 GHz, while the reflection loss was less than −10 dB from 3.4 GHz to 13.6 GHz for a nanocomposite sample thickness in the range of 1–4 mm. The combination of these two materials thus proved to give remarkable microwave absorption properties, owing to enhanced magnetic losses and favorable impedance matching conditions.Keywords:microwave absorption;solvothermal;heterojunction;hollow Fe3O4
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2018
·Vol. 98
·期 2
·422-429
·
IF 1.745
Shaoqiang Zhang,Dong Tian,Geng Zhang,Lin He,Hua Zheng,Jun Hu,Yi Li,Minxia Liu,Yaohua Hu,Wei Zhang
Abstract The peculiar magnetic properties of superparamagnetic iron oxide nanoparticles (SIONs) have spurred great interest in their potential application in enhancing medical images and drug delivery. Currently hindering the application of nanomagnetic particles in these fields is due to SIONs nonuniform size distribution, agglomeration, non-crystallinity, and low magnetic moment. In this paper, magnetic nanocrystals of different sizes and morphologies were prepared by the solvothermal method, which utilized an n-hexane-surfactant system with Fe(acac) 3 and iron-powder precursors. The crystalline structure and particle size of grown SIONs are characterized by X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM). HRTEM showed that the SIONs were approximately 5.6–6.8 nm in size with no agglomeration and a uniform distribution. Within the reaction time, HRTEM also confirmed that the shape and nanocrystals of SIONs had changed from an irregular crystal shape to triangles and quadrilaterals, and finally to hexagonal nanoparticles. According to the test results of the magnetic properties test and the literature, the material that has been synthesized is a superparamagnetic material. And the maximum saturation magnetization was 62.65 emu/g, which is reported among the largest magnetic properties of SIONs at a size of 6.8 nm.
Superparamagnetic Fe 3 O 4 nanoparticals with different size and morphology were prepared by solvothermal method in N-hexane-surfactant system with the precursors of Fe(acac) 3 and iron powder. With the increasing reaction time and under the regulation of the surfactant molecules, the morphology and nanocrystals of SIONs have initially changed from the irregular crystal to triangles and quadrilaterals shape, and finally to the hexagonal nanoparticles.
研究领域:
生物医学工程
·
纳米材料科学
·
磁性材料
·
药物输送系统
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 27
·27712-27725
·
IF 2.914
Zhuan Run,Wang Jianlong
Antibiotics are becoming ubiquitous emerging contaminants in the aquatic environments due to their large amount of production and extensive application, which have received increasing public concern. In this paper, the degradation and mineralization of sulfamethoxazole (SMX) by ionizing radiation in the presence of Fe 3 O 4 as Fenton-like catalyst were evaluated, the influencing factors, such as the initial SMX concentration, initial pH, water matrix, and radical scavenger, etc. were examined. The results demonstrated that SMX could be efficiently degraded. The addition of Fe 3 O 4 could improve the degradation efficiency of SMX and increased the dose constant at various SMX initial concentrations. More than 98% of SMX was degraded in Fe 3 O 4 /gamma radiation system at a wide range of pH (about 3.0–11.0). The mineralization of SMX in the presence of Fe 3 O 4 was increased by 200%. Adding free radical scavenger (tert-butyl alcohol) inhibited the degradation of SMX. The addition of Fe 3 O 4 enhanced the dose constant of ·OH, indicating that Fe 3 O 4 promoted the formation of hydroxyl radicals (·OH) and then improved SMX degradation and mineralization. The degradation efficiency of SMX in secondary effluent of WWTP decreased from 100 to 84% in secondary effluent compared with that in deionized water. The intermediate products during the degradation of SMX by ionizing radiation were identified by high-performance liquid chromatography, and a possible pathway of SMX degradation in such a system was tentatively proposed.
Schema illustration of SMX degradation by irradiation in the presence of Fe 3 O 4
研究领域:
环境科学
·
放射化学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2016
·Vol. 134
·期 7
·
IF 1.866
Jie-Ping Fan,Dan-Dan Liao,Yan-Long Xie,Bing Zheng,Jia-Xin Yu,Ya-Hui Cao,Xue-Hong Zhang,Hai-Long Peng
A composite material (MIP@Fe 3 O 4 @GO) based on molecular imprinted polymer (MIP), superparamagnetic Fe 3 O 4 particles and graphene oxide (GO) was prepared by the chemical coprecipitation method, and used to simultaneously separate and enrich two alkaloids (evodiamine and rutaecarpine) in the extract of Evodiae fructus . The as-prepared MIP@Fe 3 O 4 @GO was characterized by Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM), and vibrating sample magnetometer (VSM). The adsorption kinetics, isotherms, competitive adsorption, and reusability of MIP@Fe 3 O 4 @GO were also investigated. The results revealed that MIP@Fe 3 O 4 @GO was sensitive to the magnetic field and could be easily separated using an external magnet; MIP@Fe 3 O 4 @GO showed good recognition selectivity, as well as simultaneous enrichment and separation abilities for evodiamine and rutaecarpine in the extract of E. fructus with satisfactory recoveries. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44465.
研究领域:
材料科学
·
药物分析
·
中药学
✓ 已验证
产品关联
DOI
高影响因子
Energy Technology
·
2020
·Vol. 8
·期 10
·2000544
·
IF 3.404
Xuexia Liu,Limin Liu,Weiwei Yan,Yinfeng Wang,Chunfang Huang,Zhijun Wang
Iron-based materials are ideal faradaic electrodes for supercapacitors. However, boosting the specific capacitance and preparation with the simple method of iron-based materials remains a great challenge. Herein, hierarchical Fe 3 O 4 @FeS 2 nanocomposites are constructed through an annealing strategy with monohydrate ferrous sulfate as the precursor. X-ray diffractometry, high-resolution transition electron, and X-ray photoelectron spectroscopy results reveal that the hierarchical Fe 3 O 4 @FeS 2 nanocomposite is successively fabricated. The as-prepared materials exhibit a remarkable specific capacitance of 597.1 F g −1 at a current density of 3 A g −1 as electrode materials of supercapacitors. Inspiringly, specific capacitance is superior to most iron-based electrodes in previous reports. This may be ascribed to the junction at the interface of the different components and the efficient electron transfer of FeS 2 . This work is meaningful for the design and preparation of electrode materials with specific capacitance.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
DESALINATION
·
2021
·
IF 9.501
Lian Song,Xiong-Fei Zhang,Zhongguo Wang,Tianran Zheng,Jianfeng Yao
Wood-based solar desalination is emerged as one of the promising methods to address the water shortage problem. Herein, a wood evaporator was designed by a two-layer structure: a hydrophobic top layer (Fe 3 O 4 ) and a superhydrophilic delignified wood bottom layer. The Fe 3 O 4 coated delignified wood (Fe-D-Wood) demonstrates an evaporation rate of 1.3 kg m −2 h −1 and a conversion efficiency of 73%. Fe 3 O 4 with a narrow bandgap (0.8 eV) affords a broad light absorption and polyvinyl alcohol (PVA) enhances the affinity between Fe 3 O 4 and wood substrate, and the wood evaporator presents a good anti-fouling property. Two reasons contribute to such self-regenerating ability: i) salts are difficult to deposit on the hydrophobic layer, and ii) the rapid water uptake promotes the re-dissolution of salts into bulk water. Such wood-based evaporator holds great potential for practical desalination applications .
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
MATERIALS RESEARCH BULLETIN
·
2013
·
IF 1.913
Dan Wang,Ping Yang,Yuanna Zhu
Fe 3 O 4 nanoparticles (NPs) have been synthesized by the thermal decomposition of iron oleate complex in 1-octadecene solutions using organic amines as stabilizers such as trioctylamine (TOA), oleylamine (OAm), and hexadecylamine (HDA). By optimizing preparation conditions such as temperature, time, and the concentration of reaction reagents, the NPs exhibited adjusted sizes and morphologies (spherical, truncated octahedral, cubic, and tetrahedral). Organic amines play an important role for the morphology of the NPs. For example, truncated octahedral shape was gradually changed into quasi-cubic shape if adding TOA in the reaction system for a long time. In contrast, spherical, cubic, and tetrahedral Fe 3 O 4 NPs were fabricated in the case of OAm used. Because of OAm used as a reducing agent, reaction temperature was decreased. HDA resulted in spherical Fe 3 O 4 NPs a large size. It is confirmed that organic amine molecules were bound on the surface of the NPs by measuring the Fourier transformation infrared spectroscopy of samples.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Yanhua Wang,Jianying Tong,Kefeng Xie
Among various electrochemical energy storage systems, Li-S batteries are one of the most promising candidates. However, the application of Li-S batteries is mainly hindered by the shuttle effect of soluble polysulfide. To inhibit this shuttle effect, hollow Fe 3 O 4 spheres (HFS) are prepared and used as host materials for sublimed sulfur. Due to the strong absorption between Fe 3 O 4 spheres and polysulfide, the as-prepared S@HFS composites exhibit excellent cycle stability. As a result, the S@HFS composites show a high initial specific capacity of 1310 mAh g -1 at 0.1 C.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2018
·Vol. 20
·期 46
·7486-7491
·
IF 3.304
Guihuan Chen,Bing Yu,Chenghao Lu,Haohao Zhang,Youqing Shen,Hailin Cong
Encapsulating well-defined nanoparticles (NPs) into ZIF-8 to form core–shell structures not only can minimize the drawbacks and maximize the advantages of the disparate components but also may provide synergistic functionality. This work presents novel one-pot synthetic methods to produce Fe3O4@ZIF-8 NPs. Moreover, the morphology of Fe3O4@ZIF-8 NPs can be easily controlled by changing the synthesis conditions (time, temperature, and dosage). The as-obtained Fe3O4@ZIF-8 NPs have good dispersibility and a large specific surface area and they are proven to have potential applications as drug delivery models with good biocompatibility, high drug loading and good pH responsiveness.
研究领域:
材料科学
·
药学
·
纳米医学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 43
·18339-18344
·
IF 0
Zhiming Chen,Wenhui Xu,Li Jin,Juanjuan Zha,Tingxian Tao,Ying Lin,Zhilin Wang
Amine-functionalized Fe3O4@C nanoparticles have been successfully synthesized on a large scale via a solvothermal route. The morphology, structure and properties of the Fe3O4@C nanoparticles were investigated through different analytical tools. Due to the magnetic nature and the presence of amine-functionalized groups, the as-prepared Fe3O4@C nanoparticles were employed as magnetic carriers for lipase immobilization. Our results indicate that the lipase loading amount on the magnetic Fe3O4@C nanoparticles was about 115.6 mg of protein per g. The factors related to the catalytic activity of the immobilized lipase on the magnetic carriers were systematically investigated. Hydrolytic activity tests reveal that the immobilized lipase retains about 93% of the free enzyme activity. It should be mentioned that the thermal stability of the immobilized lipase was strikingly higher than that of the free lipase. Most importantly, the immobilized lipase retained more than 68% of its initial activities after 10 times reuse. It is hoped that the amine-functionalized Fe3O4@C nanoparticles may find an application in biotechnology and catalysis.
研究领域:
生物技术
·
催化科学
✓ 已验证
产品关联
DOI
危险品化学品经营许可证（带存储）