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Jiaomin Lin, Pengyan Xin, Lu An, Yanjun Xu, Cheng Tao, Qiwei Tian, Zhiguo Zhou, Bing Hu, Shiping Yang
A small Fe3O4 nanoparticles-based T1 contrast agent was assembled into a pH- and glutathione-responsive T2-T1 switching contrast agent, Fe3O4-ZIF-8. In vivo T1-weighted images of mice showed that Fe3O4-ZIF-8 displayed darkening contrast enhancement for liver sites, while darkening to brightening contrast enhancement at tumor sites, giving large inverse contrast for distinguishing the normal and tumor tissues.
December 14, 2018: Chemical Communications: Chem Comm
Desheng Li, Yu Zhang, Kun Rui, Huijuan Lin, Yan Yan, Xiaoshan Wang, Chao Zhang, Xiao Huang, Jixin Zhu, Wei Huang
Nanostructured manganese oxides have been regarded as promising anodes for lithium-ion batteries (LIBs) due to their high specific capacity, environmental friendliness and low cost. However, as conversion-type electrodes, their scalable utilization is hindered by intrinsically low reaction kinetics, large volume variation and high polarization. Herein, a coaxial-cable tubular heterostructures composed of hollow carbon skeleton, Fe3O4 nanoparticles and ultrathin MnO2 nanosheets from inside out, donated as MnO2@Fe3O4@C, is synthesized via facile two-step hydrothermal process...
December 11, 2018: Nanotechnology
Hafiz M A Sharif, Hao-Yi Cheng, Muhammad Rizwan Haider, Kifayatullah Khan, Lihui Yang, Aijie Wang
Dealing with nitrogen oxides (NOx) from flue gas is commonly to form harmless nitrogen gas (N2) in traditional technologies, while less effort has been done to recover these N containing chemicals. In this work, we developed a novel nano-magnetic adsorbent, Fe3O4@EDTA@Fe(II) complex (MEFe(II)), for NO removal. The NO adsorbed by MEFe(II) was then selectively converted to N2O, a valuable compound in many industries, by using sulfite (a product from desulfurization in flue gas treatment) as the reductant with the regeneration of MEFe(II)...
December 10, 2018: Environmental Science & Technology
Dan Shao, Xinlei Zhang, Wei Lyu, Yuanyuan Zhang, Guoqiang Tan, Hao Xu, Wei Yan
A new electrode consisting of a Ti/PbO2 shell as main electrode (ME) and numerous Fe3O4/Sb-SnO2 granules as auxiliary electrodes (AEs) was developed for flexible electrochemical oxidation (EO) treatment of wastewater. Material and electrochemical characterizations were carried out to study the impacts of the loading amount of the AEs on the attribution and construction of the electrode. Lignin, a complex group of polymeric macromolecules, was selected as the representative actual contaminant to test the real EO capability of the assembled electrodes with different AEs' loading amounts...
December 10, 2018: ACS Applied Materials & Interfaces
Shusheng Pan, Zhiyu Liu, Wei Lu
In this study, naked Au(core)/Fe3O4(shell) hybrid nanostructures are rapidly synthesized by plasmon-driven anti-replacement reaction. The Au nanoparticles are prepared by pulsed laser ablation in water. The mixture of Au nanoparticles and FeCl3 solution is irradiated under laser with specific wavelength. The Fe3+ ions are reduced to low valence species by the "hot electrons" in Au, and form the Fe3O4 spindles on the surface of Au nanoparticles. The Au nanoparticles are synchronously oxidized to Au+ and Au3+ ions by the "hot holes"...
November 16, 2018: Nanotechnology
Honghui Chen, Zhiyu Huang, Yi Huang, Yi Zhang, Zhen Ge, Wenle Ma, Tengfei Zhang, Manman Wu, Shi-Tong Xu, Fei Fan, Sheng-Jiang Chang, Yongsheng Chen
With the booming microwave and terahertz technology for communication, detection and healthcare, the consequent increasingly complicated electromagnetic environment is in urgent need of high-performance microwave and terahertz absorption materials. However, it's still a huge challenge to achieve consecutively strong absorption in both microwave and terahertz regimes. Herein, an ultra-broadband and highly efficient absorber for both microwave and terahertz bands based on monolithic 3D cross-linked Fe3O4/graphene material (3DFG) is first reported...
December 4, 2018: ACS Applied Materials & Interfaces
Xiaohu Yu, Artem R Oganov, Qiang Zhu, Fei Qi, Guangrui Qian
Using evolutionary structure prediction and ab initio thermodynamics, we determine stable compositions and structures of small CemOn and FemOn clusters at realistic temperatures and oxygen pressures. We use second energy differences as the criterion determining clusters of particular stability ("magic" clusters), whereas HOMO-LUMO gaps are used to gauge chemical inertness - i.e. the ability of a cluster to survive in a complex chemical environment. We find that, similar to atomic nuclei (which are clusters made of neutrons and protons), compositional space of two-component clusters also has ridges and islands of stability, surrounded by sea of instability...
November 30, 2018: Physical Chemistry Chemical Physics: PCCP
Kangqiang Qiu, Jinquan Wang, Thomas W Rees, Liangnian Ji, Qianling Zhang, Hui Chao
Iridium complexes were used as a mitochondria-targeting agent to modify the surface of a photothermogenic nanozyme Fe3O4 nanoparticles (Ir@Fe3O4 NPs). Upon NIR irradiation, Ir@Fe3O4 NPs increase the localized temperature to 42 °C which accelerates the catalysis of ˙OH production from H2O2 resulting in excellent mild photothermal therapy.
November 30, 2018: Chemical Communications: Chem Comm
Yanan Zhang, Yu Yang, Haichao Duan, Changli Lü
Magnetic Fe3O4@catechol-formaldehyde resin (CFR) core-shell nanospheres were fabricated via a controllable hydrothermal method. The shell thickness of Fe3O4@CFR nanospheres can be effectively regulated in the range of 10~170 nm via adjusting reaction parameters. Especially, catechol groups on the surface of nanospheres also play a significant role in mussel-inspired chemistry to further combine with graphene oxide (GO) to wrap the Fe3O4@CFR spheres. The obtained Fe3O4@CFR and Fe3O4@CFR@GO nanospheres can be used as the effective catalyst supports of small Pd nanoparticles ( < 10 nm) formed via in-situ synthesis route...
November 30, 2018: ACS Applied Materials & Interfaces
Irina Timofeeva, Mariya Alikina, Anna Vlasova, Mikhail Osmolowsky, Mikhail Voznesenskiy, Olga Volina, Leonid Moskvin, Olga Osmolovskaya, Andrey Bulatov
In this study, Fe3O4-based composite magnetic nanoparticles were found to separate volatile compounds directly in the gas phase for the first time. The phenomenon of H2Se sorption on the magnetic nanoparticles was studied in detail and applied for separation and preconcentration. The developed approach was applied for the determination of selenium in dietary supplement samples after microwave digestion by ETA-AAS as a proof-of-concept example.
November 29, 2018: Analyst
Jie Wang, Yanfei Xu, Guangyuan Ma, Jianghui Lin, Hongtao Wang, Chenghua Zhang, Mingyue Ding
Converting syngas to value-added chemicals via Fischer-Tropsch synthesis (FTS) has attracted much attention, whereas the direct hydrogenation of CO to heavy olefins, especially linear α-olefins (LAOs), remains a challenge. In this study, we designed a core-shell Fe3O4@MnO2 catalyst to realize the direct conversion of syngas to LAOs with high efficiency. This catalyst exhibited an enhanced selectivity of 79.60% for total alkenes and 64.95% for C4+ alkenes, 91% of which are LAOs, at a CO conversion of approximately 75%...
November 28, 2018: ACS Applied Materials & Interfaces
Xiaodong Xie, Xiuming Zhang, Jun Chen, Xun Tang, Meiqin Wang, Lei Zhang, Zhen Guo, Wenrong Shen
Fe3O4-magnetic liposome (MLP) can deliver drugs to target tissues and can increase drug efficacy. The present study aimed to investigate the effects of solamargine (SM) and Fe3O4-SM in pancreatic cancer (PC). Cell viability was detected using a Cell Counting kit‑8 assay. Apoptosis and cell cycle progression was tested using a flow cytometry assay. A scratch assay was used to examine cell metastasis. Quantitative polymerase chain reaction, western blot analysis or immunohistochemical analysis were performed to determine the expression of target factors...
November 19, 2018: International Journal of Oncology
Sheng-Dong Pan, Xiao-Hong Chen, Hao-Yu Shen, Xiao-Ping Li, Mei-Qiang Cai, Yong-Gang Zhao, Mi-Cong Jin
This article has been retracted at the request of the Editor after the corresponding author pointed the Editor to comments from an anonymous reader. The article reports electron micrographs of different preparations while showing identical images as used in previous publications by the same authors. The particles in Fig. 4C (SEM image of Fe3O4@SiO2) are identical to each other and the corresponding author confirmed that these have been copy-pasted. In addition, these particles have previously been communicated as different substances in Fig...
January 10, 2019: Analytica Chimica Acta
Haiqing Ma, Mahadeo A Mahadik, Jin Woo Park, Manish Kumar, Hee Suk Chung, Weon Sik Chae, Gi Won Kong, Hyun Hwi Lee, Sun Hee Choi, Jum Suk Jang
In this study, we present an advanced strategy of low-temperature hydrogen annealing combined with high- temperature quenching in air for activating α-Fe2O3 nanorod photoanodes to boost the photoelectrochemical performance. We report that various low-temperature annealing conditions (340, 360, 380, and 400 °C) under hydrogen gas flow convert β-FeOOH into magnetite (Fe3O4) as well as introduce Sn4+ diffusion from FTO substrates to its surface. Furthermore, high-temperature quenching (800 °C) resulted in the phase change of magnetite (Fe3O4) into hematite (α-Fe2O3) and self Sn4+ doping into the hematite lattice...
November 27, 2018: Nanoscale
Harpreet Kaur, Mandeep Kaur, Preet Kamal Walia, Manoj Kumar, Vandana Bhalla
The present study demonstrates the development of supramolecular porous ensemble consisting of hetero-oligophenylene derivative 6 and Au-Fe3O4 nanodots. Supramolecular assemblies of AIE active hetero-oligophenylene derivative 6 served as reactors for the generation of Au-Fe3O4 nanodots. The as prepared supramolecular ensemble functioned as an efficient recyclable photocatalytic system for C(sp2)-H bond activation of anilines for the construction of quinoline carboxylates. Interestingly, the 'dip catalyst' prepared by depositing PTh-co-PANI-6: Au-Fe3O4 nanodots on a filter paper which served as a recyclable strip (upto 10 cycles) for C-C/C-N bond formation reaction...
November 27, 2018: Chemistry, An Asian Journal
Xiaoting Xue, Rui Lu, Min Liu, Yi Li, Jiansheng Li, Lianjun Wang
Biomedical applications and biomarkers for early clinical diagnostics and the treatment of diseases demand efficient and selective enrichment platforms for glycoproteins. Thus, we herein report a facile and general approach for the preparation of boronic acid-functionalized magnetic nanoparticles for the selective enrichment of glycoproteins. More specifically, Fe3O4 magnetic nanoparticles were initially prepared via a solvothermal reaction, and core-shell-structured Fe3O4@SiO2 nanoparticles were obtained according to a sol-gel process...
November 26, 2018: Analyst
Wen Jing Yang, Lijun Liang, Xiaodong Wang, Yanpeng Cao, Wenya Xu, Dongqing Chang, Yu Gao, Lianhui Wang
Surface decoration of nanohydrogels with functional molecules as well as nanomaterials offers a facile approach for developing multifunctional drug nanocarriers. Herein, the surface-tailorable polymer nanohydrogels, with the catechol groups as a universal anchor, were prepared by simple reflux-precipitation polymerization for versatile functionalization as drug delivery systems. The resultant polymer nanohydrogels were not only capable of delivering doxorubicin (DOX) through electrostatic interactions, but also exhibited facile conjugation with magnetic Fe3O4 nanoparticles and anticancer drug bortezomib (BTZ) via the versatile catechol-based coupling chemistry...
November 22, 2018: Biomaterials Science
Idoia Castellanos-Rubio, Rahul Munshi, Yueling Qin, David B Eason, Iñaki Orue, Maite Insausti, Arnd Pralle
The two major limitations for nanoparticle based magnetic hyperthermia in theranostics are the delivery of a sufficient number of magnetic nanoparticles (MNPs) with high heating power to specific target cells and the residence time of the MNPs at the target location. Ferromagnetic or Ferrimagnetic single domain nanoparticles (F-MNPs), with a permanent magnetic dipole, produce larger magnetic and thermal responses than superparamagnetic nanoparticles (SP-MNPs) but also agglomerate more. MNP agglomeration degrades their heating potential due to dipolar interaction effects and interferes with specific targeting...
November 29, 2018: Nanoscale
Jiarong Huang, Liming Cao, Daosheng Yuan, Yukun Chen
We designed novel self-healing thermoplastic vulcanizates (TPVs), achieving excellent thermal/magnetic/light triggered shape memory assisted self-healing behavior. Damage on polylactide (PLA)/epoxidized natural rubber (ENR)/Fe3O4 TPVs could be healed via three events synergistically: The shape memory effect of TPVs resulted in the physical contact of damaged surfaces; the desorption-absorption of ENR/Fe3O4 bound rubber promoted inter-diffusion of ENR chains, leading to the self-healing of ENR phase; ENR was grafted onto PLA segment to assist PLA rearranging and entangling again to achieve the repair of TPVs...
November 20, 2018: ACS Applied Materials & Interfaces
Long Wang, Sijie Chen, Yun Zhu, Meixiang Zhang, Shixiong Tang, Jingyi Li, Wenjing Pei, Biying Huang, Chengcheng Niu
Current nanodrug-based cancer therapy is susceptible to the problems of rapid clearance from circulation and limited therapeutic efficacy. Herein, we report a magnetically targeted and photothermal-triggered drug release nanotheranostics system based on superparamagnetic iron oxide (Fe3 O4 ), IR780, doxorubicin (DOX), and perfluoropentane (PFP) entrapped poly-lactide- co-glycolide (PLGA) nanoparticles (IR780/Fe3 O4 @PLGA/PFP/DOX NPs) for triple-modal imaging-guided synergistic therapy of breast cancer. In this work, IR780 and Fe3 O4 convert light into heat, which triggers DOX release from IR780/Fe3 O4 @PLGA/PFP/DOX NPs and a phase-shift thermoelastic expansion of PFP; this procedure further accelerates the DOX release and tissue extrusion deformation...
November 28, 2018: ACS Applied Materials & Interfaces
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