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Marziye Sadat Mirhosseyni, Firouzeh Nemati, Ali Elhampour
AIM AND OBJECTIVE: One of the principles of green chemistry is using inexpensive reagents and catalysts to design green route for synthesis of organic compounds. Recently magnetic nanoparticles have provided a considerable merits. In this study, hollow Fe3O4@Dopamine-SO3H has been successfully applied for the green synthesis of tetrahydrobenzo[b]pyrans and spirooxindoles via one-pot multi-component reaction. MATERIALS AND METHODS: Chemical reagents were purchased from Merck and Aldrich...
August 17, 2018: Combinatorial Chemistry & High Throughput Screening
Yudhajit Bhattacharjee, Dipanwita Chatterjee, Suryasarathi Bose
Herein, we report high electromagnetic interference (EMI) shielding effectiveness of -40 dB in the Ku- band (for a 600 µm thick film) through unique core-shell hetereostructure consisting of a ferritic core (Fe3O4) and a conducting shell (multiwalled carbon nanotubes, MWCNT) supported onto a dielectric spacer (here SiO2). In recent times, materials with good flexibility, heat dissipating ability and sustainability together with efficient EMI shielding at minimal thickness is highly desirable; especially if they can be easily processed into thin films...
August 14, 2018: ACS Applied Materials & Interfaces
Shi-Jin Dai, You-Cai Zhao, Dong-Jie Niu, Qiang Li, Yu Chen
Molten salt has been regarded as a versatile and environmental-friendly method for the material preparation and waste destruction. In this work, molten FeCl3 was utilized for the generation of magnetic biochar (MBC) derived from simultaneous activation and magnetization of biomass. The sample characterization indicated that MBC had a rough surface with BET surface area of 404 m2/g and total pore volume of 0.35cm3/g. Highly dispersed Fe3O4 and nitrogen could be deposited on the surface, leading to an excellent magnetization property...
August 10, 2018: Journal of the Air & Waste Management Association
Shiyuan Liu, Lefu Mei, Xiaoliang Liang, Libing Liao, Guocheng Lv, Shuaifei Ma, Shiyao Lu, Amr M Abdelkader, Kai Xi
Microwave induced catalytic degradation is considered amongst the most efficient techniques to remove antibiotic such as chlortetracycline from contaminated water. Described here is a new microwave induced oxidation catalyst based on carbon nanotube decorated uniformly with nanoparticles of Fe3O4. The combination of dielectric loss and magnetic loss of the material contributed to its stronger microwave absorption and the ability to produce more "hot spots". These hot spots promoted the oxidation of common antibiotics like chlortetracycline, tetracycline and oxytetracycline under microwave irradiation...
August 9, 2018: ACS Applied Materials & Interfaces
Wei Liu, Juncen Liu, Zhihong Yang, Guangbin Ji
One of the major hurdles of ferrites-based microwave absorbing materials is the limited working frequency that urgently calls for effective modification technique. Herein, a controllable carbothermal route has been developed to ameliorate the microwave absorption performance of Fe3O4 nanospheres by using MOFs shell as carbon source with changing ramping rates. Enhanced synergistic attenuation induced by varied composition and tailored morphology is of great importance, which can be regarded as the superiority of comprehensive (magnetic and dielectric) than unilateral (dielectric) modification technique...
August 8, 2018: ACS Applied Materials & Interfaces
Hongjie Bian, Baoting Sun, Jiandong Cui, Sizhu Ren, Tao Lin, Yuxiao Feng, Shiru Jia
In this study, a novel co-immobilization biocatalyst for one-pot starch hydrolysis was prepared through shielding enzymes on the Fe3 O4 /SiO2 core-shell nanospheres by a Fe3+ -tannic acid (TA) film. In brief, α-amylase and glucoamylase were covalently immobilized on amino-modified Fe3 O4 /SiO2 core-shell nanospheres using glutarldehyde as a linker. Then, a Fe3+ -TA protective film was formed through the self-assembly of the Fe3+ and TA coordination complex (Fe3+ -TA@Fe3 O4 /SiO2 -enzymes). The film acts a "coating" to prevent the enzyme from denaturation and detachment, thus significantly improving its structural and operational stability...
August 9, 2018: Journal of Agricultural and Food Chemistry
Vikas Nandwana, Ruiying Zhou, Jeotikanta Mohapatra, Sungkyu Kim, Pottumarthi V Prasad, J P Liu, Vinayak P Dravid
Exchange coupling between hard and soft magnetic materials at the nanoscale exhibits novel or improved physical properties for energy and data storage applications. Recently, exchange coupling has also been explored in core/shell magnetic nanostructures (MNS) composed of hard and soft magnetic spinel ferrites, but applications have been limited in biomedicine due to the presence of "toxic" cobalt based ferrites as hard magnetic component. We report core/shell MNS where both core and shell components are soft magnetic ferrites (Fe3 O4 , MnFe2 O4 , and Zn0...
August 6, 2018: ACS Applied Materials & Interfaces
Qin Liu, Xiaoxue Zhang, Bing Zhang, Yonglan Luo, Guanwei Cui, Fengyu Xie, Xuping Sun
Industrially, NH3 is mainly produced via the Haber-Bosch process which is not only energy-consuming but emits a large amount of CO2. Electrochemical reduction is regarded as an environmentally-benign alternative for sustainable NH3 synthesis, and its efficiency heavily depends on the identification of Earth-abundant catalysts with high activity for the N2 reduction reaction (NRR). In this work, we report that a spinel Fe3O4 nanorod on a Ti mesh (Fe3O4/Ti) acts as an efficient and durable NRR electrocatalyst under ambient conditions...
August 2, 2018: Nanoscale
Liang Liang Yin, Xiang Yin Kong, Yao Zhang, Yan Qin Ji
A magnetic metal organic framework (MMOF) was synthesized and used to separate Sr2+ in aqueous solution. The shape and structure of prepared Fe3O4@UiO-66-NH2 were characterized, and the absorbed concentration of strontium was determined through inductively coupled plasma mass spectrometry. The results indicated that Fe3O4 and UiO-66-NH2 combined through chemical bonding. The experimental adsorption results for separation of Sr2+ in aqueous solution indicated that the adsorption of Sr2+ to Fe3O4@UiO-66-NH2 increased drastically from pH 11 to pH 13...
June 2018: Biomedical and Environmental Sciences: BES
Yong Yu, Yang Li, Yongqiang Wang, Bingfang Zou
Hierachical Fe3 O4 microspheres with superparamagnetic properties are attractive for their superior structural, water-dispersible, and magnetic separation merits. Here self-template etching route was developed to create optimal porous structure in superparamagnetic Fe3 O4 microspheres by using the oxalic acid (H2 C2 O4 ) as etching agent. A plausible formation mechanism of the urchin-like Fe3 O4 microspheres was proposed based on systematic investigation of the etching process, which involved two stages including pore-forming step based on size-selective etching and pore-expanding step based on further etching...
August 1, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Yinghua Yan, Yujie Lu, Baichun Wang, Yiqian Gao, Lingling Zhao, Hongze Liang, Dapeng Wu
The development of covalent organic framework (COF)-derived materials with additional functions and applications is highly desired. In this work, a unique COF-functionalized hydrophilic magnetic nanosphere (Fe3 O4 @PDA@TbBd) with Fe3 O4 as a magnetic core, polydopamine (PDA) as a hydrophilic middle layer, and TbBd as an outer COF shell was facilely prepared as a novel hydrophilic platform for efficient detection of phthalic acid esters (PAEs). The resultant Fe3 O4 @PDA@TbBd nanosphere displayed strong magnetic response, high surface area, and good hydrophilicity...
August 8, 2018: ACS Applied Materials & Interfaces
Wayne W Lukens, Sarah A Saslow
The fission product, 99Tc, presents significant challenges to the long-term disposal of nuclear waste due to its long half-life, high fission yield, and to the environmental mobility of pertechnetate (TcO4-), the stable Tc species in aerobic environments. Migration of 99Tc from disposal sites can potentially be prevented by incorporating it into durable waste forms based on environmentally stable minerals. Since Tc(iv) and Fe(iii) have the same ionic radius, Tc(iv) can replace Fe(iii) in iron oxides. Environmentally durable iron oxides include goethite (α-FeOOH), hematite (α-Fe2O3), and magnesioferrite (MgFe2O4)...
July 31, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Qi Li, Yilin Chen, Xinyi Zhou, Dengyue Chen, Yang Li, Jiayong Yang, Xuan Zhu
Combination cancer therapy with various kinds of therapeutic approaches could improve the effectiveness of treatment while reducing side effects. Herein, we elaborately developed a theranostics nanoplatform based on magnetic polydopamine (MPDA) coated with hyaluronic acid-methotrexate conjugates (MPDA@HA-MTX) for chemo-photothermal treatment (PTT). In this nanoplatform, Fe3 O4 served as the core was applied as contrast agent for T2 -weighted magnetic resonance imaging (MRI) and early phase magnet targeting...
August 6, 2018: Molecular Pharmaceutics
Jianyu Liu, Xinxin Wang, Wenke Zhang
Studies on nucleic acid structure and interactions between nucleic acid and its binding molecules are of great importance for understanding and controlling many important biological processes. Atomic force microscopy (AFM) imaging is one of the most efficient methods to disclose the DNA structure and binding modes between DNA and DNA-binding molecules. Long-chain DNA tends to form a random coiled structure, which prevents direct AFM imaging observation of the subtle structure formed by DNA itself or protein binding...
July 30, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Yi Yang, Lu Xu, Susan Dekkers, Lijie Grace Zhang, Flemming R Cassee, Yi Y Zuo
Metal-based nanomaterials (MNMs) represent a large category of the engineered nanomaterials, and have been extensively used to enhance the electrical, optical, and magnetic properties of nanoenabled consumer products. Inhaled MNMs can penetrate deeply into the peripheral lung at which they first interact with the pulmonary surfactant (PS) lining of alveoli. Here we studied the biophysical inhibitory potential of representative MNMs on a modified natural PS, Infasurf, using a novel in vitro experimental methodology called the constrained drop surfactometry (CDS)...
August 7, 2018: Environmental Science & Technology
Jun Zhang, Wan-Ni Wang, Meng-Li Zhao, Chen-Yang Zhang, Chen-Xi Huang, Sheng Cheng, Hong-Mei Xu, Hai-Sheng Qian
Magnetically recyclable photocatalyst has drawn considerable research interest because of its importance in practical applications. Herein, we demonstrate a facile hydrothermal process to fabricate magnetic core-shell microspheres of Fe3 O4 @Zn x Cd1- x S, successfully using Fe3 O4 @ZnS core-shell microspheres as sacrificed templates. The as-prepared magnetically recyclable photocatalysts show efficient photochemical reduction of Cr(VI) under irradiation of visible light. The photochemical reduction mechanism has been studied to illustrate the reduction-oxidation ability of the photogenerated electrons (e- ) and holes (h+ ), which play an important role in the reduction of Cr(VI) to Cr(III) and oxidation of organic dyes...
August 7, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Yuanming Liu, Xianying Qin, Shaoqiong Zhang, Gemeng Liang, Feiyu Kang, Guohua Chen, Baohua Li
Lithium-sulfur (Li-S) batteries are seriously restrained by the shuttling effect of intermediary products and their further reduction on the anode surface. Considerable researches have been devoted to overcoming these issues by introducing carbon-based materials as the sulfur host or interlayer in the Li-S systems. Herein, we constructed a multifunctional interlayer on a separator by inserting Fe3 O4 nanoparticles (NPs) in a porous graphene (PG) film to immobilize polysulfides effectively. The porous structure of graphene was optimized by controlling the oxidation conditions for facilitating ion transfer...
July 26, 2018: ACS Applied Materials & Interfaces
Lei Chen, Biwu Liu, Zhangrun Xu, Juewen Liu
Selective extraction of a small amount of nucleic acids from complex biological samples containing a high concentration of proteins is critical for bioanalytical chemistry. A number of previously published studies have focused on long, double-stranded DNA such as plasmid DNA. On the other hand, we are interested in short oligonucleotides. Nucleic acids have a negatively charged phosphate backbone that interacts with metal oxides strongly, and this may be used to distinguish them from proteins. In this work, a few metal oxide nanoparticles were screened, including NiO, CoO, ZnO, TiO2 , CeO2 , and Fe3 O4 for DNA recovery...
August 7, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Hongyu Quan, Yuwei He, Jujiang Sun, Weihu Yang, Wei Luo, Ce Dou, Fei Kang, Chunrong Zhao, Jian He, Xiaochao Yang, Shiwu Dong, Hong Jiang
Bone defects/fractures are common in older people suffering from osteoporosis. Traditional hydroxyapatite (HA) materials for osteoporotic bone repair face many challenges, including limited bone formation and aseptic loosening of orthopedic implants. In this study, a new multifunctional HA is synthesized by spontaneous assembly of alendronate (AL) and Fe3 O4 onto HA nanocrystals for osteoporotic bone regeneration. The chemical coordination of AL and Fe3 O4 with HA does not induce lattice deformation, resulting in a functionalized HA (Func-HA) with proper magnetic property and controlled release manner...
August 1, 2018: ACS Applied Materials & Interfaces
Sarvin Mohammadi-Aghdam, Bahareh Valinezhad-Saghezi, Yousef Mortazavi, Seyedeh Masoumeh Qhoreishi
The adsorption capacity and release attributes of magnetic Fe3 O4 @hydroxyapatite (Fe3 O4 /HAp) nanoparticles for drug molecules can be improved by modified their surfaces with logical chosen organic groups. The internal surface of nanoparticles was functionalized with (3-aminopropyl) trimethoxysilane (APTS). Comparative studies of their adsorption and release properties for various model drug molecules (such as pure hydroxyapatite, Fe3 O4 @hydroxyapatite and functionalized Fe3 O4 @hydroxyapatite) were then conducted...
July 11, 2018: Drug Research
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