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MnO nanoparticle

Zhishun He, Kai Wang, Shasha Zhu, Liang-Ai Huang, Miaomiao Chen, Jianfeng Guo, Shien Pei, Haibo Shao, Jianming Wang
Hierarchically nanostructured binary/multiple transition metal oxides with electrically conductive coatings are very attractive for lithium-ion batteries (LIBs) owing to their excellent electrochemical properties induced by their unique compositions and microstructures. Herein, hierarchical MnO doped Fe3O4@C composite nanospheres are prepared by a simple one-step annealing in Ar atmosphere, using Mn-doped Fe-based metal organic frameworks (Mn-doped MIL-53(Fe)) as precursor. The MnO doped Fe3O4@C composite particles have a uniform nanosphere structure with a diameter of ~100 nm, and each nanosphere is composed of clustered primary nanoparticles with an amorphous carbon shell, forming a unique hierarchical nanoarchitecture...
March 14, 2018: ACS Applied Materials & Interfaces
Malak Khojasteh, Shima Haghighat, Jahan Dawlaty, Vitaly V Kresin
Emulating water oxidation catalyzed by the oxomanganese clusters in the photosynthetic apparatus of plants has been a long-standing scientific challenge. The use of manganese oxide films has been explored, but while they may be catalytically active on the surface, their poor conductivity hinders their overall performance. We have approached this problem by using manganese oxide nanoparticles with sizes of 4, 6 and 8 nm, produced in a sputter-gas-aggregation source and soft-landed onto conducting electrodes...
March 8, 2018: Nanotechnology
Yunsheng Xia, Lu Xia, Yuxi Liu, Tao Yang, Jiguang Deng, Hongxing Dai
α-MnO2 nanotubes and their supported Au-Pd alloy nanocatalysts were prepared using hydrothermal and polyvinyl alcohol-protected reduction methods, respectively. Their catalytic activity for the oxidation of toluene/m-xylene, acetone/ethyl acetate, acetone/m-xylene and ethyl acetate/m-xylene mixtures was evaluated. It was found that the interaction between Au-Pd alloy nanoparticles and α-MnO2 nanotubes significantly improved the reactivity of lattice oxygen, and the 0.91wt.% Au0.48 Pd/α-MnO2 nanotube catalyst outperformed the α-MnO2 nanotube catalyst in the oxidation of toluene, m-xylene, ethyl acetate and acetone...
February 2018: Journal of Environmental Sciences (China)
Tingsheng Lin, Xiaozhi Zhao, Sheng Zhao, Hang Yu, Wenmin Cao, Wei Chen, Hui Wei, Hongqian Guo
Photodynamic therapy (PDT) is an emerging effective treatment for cancer. However, the great promise of PDT for bladder cancer therapy has not yet been realized because of tumor hypoxia. To address this challenge, we fabricated O2 -generating HSA-MnO2 -Ce6 NPs (HSA for human serum albumin, Ce6 for chlorin e6, and NPs for nanoparticles) to overcome tumor hypoxia and thus enhance the photodynamic effect for bladder cancer therapy. Methods: The HSA-MnO2 -Ce6 NPs were prepared. We investigated the O2 generation of NPs in vitro and in vivo ...
2018: Theranostics
Qian Chen, Liangzhu Feng, Jingjing Liu, Wenwen Zhu, Ziliang Dong, Yifan Wu, Zhuang Liu
No abstract text is available yet for this article.
February 2018: Advanced Materials
Jin-Lei Miao, Chuan-Bao Li, Hai-Hui Liu, Xing-Xiang Zhang
Formaldehyde (HCHO) is a main indoor pollutant that is capable of harming the health of residents. Here, we fabricated a novel MnO2/MWCNTs nanocomposite film for non-photocatalytic, room temperature removal of indoor HCHO. MnO2/MWCNTs nanocomposites with various amounts of a-MWCNTs, which were fabricated by a co-precipitation method, were assembled into composite films using vacuum filtration and solvent evaporation. Structural analysis confirms that MnO2 nanoparticles are homogeneously distributed on a-MWCNTs...
June 1, 2018: Journal of Nanoscience and Nanotechnology
Zengcai Guo, Yuming Guan, Chengxiang Dai, Jingbo Mu, Hongwei Che, Guangshuo Wang, Xiaoliang Zhang, Zhixiao Zhang, Xiliang Zhang
A one-dimensional hierarchical Ag nanoparticle (AgNP)/MnO2 nanorod (MND) nanocomposite was synthesized by combining a simple solvothermal method and a facile reduction approach in situ. Owing to its high electrical conductivity, the resulting AgNP/MND nanocomposite displayed a high specific capacitance of 314 F g-1 at a current density of 2 A g-1, which was much higher than that of pure MNDs (178 F g-1). Resistances of the electrolyte (Rs) and charge transportation (Rct) of the nanocomposite were much lower than that of pure MNDs...
July 1, 2018: Journal of Nanoscience and Nanotechnology
Xiaoxin Yang, Li Zhao, Luyi Zheng, Meiyun Xu, Xiulan Cai
An efficient surface engineering strategy for MnO nanoparticles was developed to attain enhanced colloidal stability, selective uptake by and toxicity to specific cancer cells. Specifically, MnO nanoclusters prepared by polyol method were grafted with polyglycerol (MnO-PG), and then conjugated with arginine-glycine-aspartate peptide (MnO-PG-RGD) through stepwise organic reactions. The physicochemical properties of the surface engineered MnO nanoclusters were characterized by powder X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric analysis, dynamic light scattering, zeta potential, transmission electron microscopy and high-resolution transmission electron microscopy...
December 20, 2017: Colloids and Surfaces. B, Biointerfaces
Hang Wei, Zhonghong Xia, Dingguo Xia
The exploration of anode materials of lithium-ion batteries (LIBs) is still a great challenge because of their low electrical conductivity and poor durability. Transition-metal oxides are proposed as a potential alternative, even though their dimension and structure greatly affect their electrochemical properties. In this study, MnO/Mn2 SiO4 @C cuboids were prepared via the polymerization-pyrolysis process. Larger MnCO3 precursor particles embedded into a monolithic carbon framework and formed smaller nanoparticles owing to the inducing effect of Si element in phthalocyanino silicon (SiPc), giving MnO/Mn2 SiO4 @C cuboids...
December 20, 2017: ACS Applied Materials & Interfaces
A Omelianchik, G Singh, Brigitte H McDonagh, V Rodionova, D Fiorani, D Peddis, S Laureti
Manganese oxide nanoparticles (MNOPs), when dispersed in a water solution, show a magnetic behavior that drastically changes after an aging process. In this paper, the variation in the magnetic properties has been correlated with the structural evolution of the nanoparticles: in particular, the as prepared Mn3 O4 /MnO core/shell system manifests a low temperature magnetization reversal that is strongly affected by the presence of the MnO shell and, in particular, by the existence of a frustrated interfacial region playing a key role in determining the low temperature irreversibility, the finite coercivity slightly above the Curie temperature of the Mn3 O4 phase and the horizontal displacement of the FC-hysteresis loop...
February 2, 2018: Nanotechnology
Jingjing Li, Chen Wu, Pingfu Hou, Min Zhang, Kai Xu
Magnetic resonance imaging (MRI) contrast agents have become a necessary part for clinical practice to improve the sensitivity for the diagnosis of small lesions and injuries. Among them, manganese oxide nanoparticle (MnO NPs)-based MRI contrast agent attracts more and more attention because of their better performance in the detection of brain disease and positive enhancement in T1-weighted image. However, the relatively low r1 relaxivity and complex synthetic route hampered their wider applications. In this work, we proposed a one-pot approach to prepare hydrophilic MnO NPs via a polyol-like method with poly (ethylene glycol) (PEG) as both a solvent and surfactant...
October 27, 2017: Biosensors & Bioelectronics
Alexander Ottmann, Maik Scholz, Marcel Haft, Elisa Thauer, Philip Schneider, Markus Gellesch, Christian Nowka, Sabine Wurmehl, Silke Hampel, Rüdiger Klingeler
The ferrimagnetic and high-capacity electrode material Mn3O4 is encapsulated inside multi-walled carbon nanotubes (CNT). We show that the rigid hollow cavities of the CNT enforce size-controlled nanoparticles which are electrochemically active inside the CNT. The ferrimagnetic Mn3O4 filling is switched by electrochemical conversion reaction to antiferromagnetic MnO. The conversion reaction is further exploited for electrochemical energy storage. Our studies confirm that the theoretical reversible capacity of the Mn3O4 filling is fully accessible...
October 19, 2017: Scientific Reports
Yanzhen He, Ping Xu, Bin Zhang, Yunchen Du, Bo Song, Xijiang Han, Huisheng Peng
Sodium ion batteries (SIBs) have attracted increasing attentions as promising alternatives to lithium ion batteries (LIBs). Herein, we design and synthesize ultrasmall MnO nanoparticles (∼4 nm) supported on nitrogen-doped carbon nanotubes (NDCT@MnO) as promising anode materials of SIBs. It is revealed that the carbonization temperature can greatly influence the structural features and thus the Na-storage behavior of the NDCT@MnO nanocomposites. The synergetic interaction between MnO and NDCT in the NDCT@MnO nanocomposites provides high rate capability and long-term cycling life due to high surface area, electrical conductivity, enhanced diffusion rate of Na(+) ions, and prevented agglomeration and high stability of MnO nanoparticles...
November 8, 2017: ACS Applied Materials & Interfaces
Niloufar Eskandarpour, Hassan Sereshti
The nanofibrous polycaprolactam (polyamide 6 (PA6)) incorporated with manganese oxide (MnO) nanoparticles was fabricated by electrospinning and used as a new fiber coating for headspace-solid phase microextraction (HS-SPME) of the selected phthalate esters (PEs) in water samples prior to GC-μECD. The adsorbent was fully characterized using scanning electron microscopy (SEM), Fourier transform-infrared (FT-IR) spectroscopy and thermogravimetric analysis (TGA). The main parameters that affect the HS-SPME efficiency such as extraction temperature, ionic strength, extraction and desorption times were investigated...
January 2018: Chemosphere
Xiaoyan Jin, Joohyun Lim, Yoonhoo Ha, Nam Hee Kwon, Hyeyoung Shin, In Young Kim, Nam-Suk Lee, Myung Hwa Kim, Hyungjun Kim, Seong-Ju Hwang
The effect of the catalyst morphology on the growth of carbon nanotubes (CNT) on nanostructured transition metal oxides was investigated to study a novel low-temperature synthetic route to functional CNT-transition metal oxide nanocomposites. Among several nanostructured manganese oxides with various morphologies and structures, only exfoliated 2D nanosheets of layered MnO2 acted as an effective catalyst for the chemical vapor deposition of CNT at low temperatures of 400-500 °C, which emphasizes the critical role of the catalyst morphology in CNT growth...
August 31, 2017: Nanoscale
Hendrik Antoni, Wei Xia, Justus Masa, Wolfgang Schuhmann, Martin Muhler
Manganese oxides are promising electrocatalysts for the oxygen evolution reaction due to their versatile redox properties. Manganese oxide (MnOx) nanoparticles were synthesized on oxygen- and nitrogen-functionalized carbon nanotubes (OCNTs and NCNTs) by calcination in air of Mn-impregnated CNTs with a loading of 10 wt% Mn. The calcined samples were exposed to reducing conditions by thermal treatment in H2 or NH3, and to strongly oxidizing conditions using HNO3 vapor, which enabled us to flexibly tune the oxidation state of Mn from 2+ in MnO to 4+ in MnO2...
July 5, 2017: Physical Chemistry Chemical Physics: PCCP
Dipyaman Mohanta, Koushik Barman, Sk Jasimuddin, Md Ahmaruzzaman
Semiconducting nanomaterials are very important by means of their stability and wide band gap tunability. Visible light induced photoelectrocatalytic water oxidation based on these material are challenging as they have large band gap energies. Herein, we report that MnO doping can activate wide band gap semiconductors like SnO2 towards visible light induced water oxidation. Rutile SnO2 nanoparticles (band gap 3.6eV), usually absorbing at UV region, was capable of harvesting visible light when doped with MnO thereby minimizing the energy requirement for photoelctrocatalytic water splitting...
November 1, 2017: Journal of Colloid and Interface Science
Burçak Ebin, Martina Petranikova, Britt-Marie Steenari, Christian Ekberg
Zinc (Zn) recovery from alkaline and zinc-carbon (Zn-C) battery waste were studied by a laboratory scale pyrolysis process at a reaction temperature of 950°C for 15-60min residence time using 5%H2(g)-N2(g) mixture at 1.0L/min gas flow rate. The effect of different cooling rates on the properties of pyrolysis residue, manganese oxide particles, were also investigated. Morphological and structural characterization of the produced Zn particles were performed. The battery black mass was characterized with respect to the properties and chemical composition of the waste battery particles...
June 21, 2017: Waste Management
Lina Sanchez-Botero, Adriana P Herrera, Juan P Hinestroza
We report on the synthesis of alpha manganese dioxide (α-MnO₂) nanorods using natural extracts from Vitis vinifera grape stems and Malus domestica 'Cortland' apple peels. We used a two-step method to produce highly crystalline α-MnO₂ nanorods: (1) reduction of KMnO₄ in the presence of natural extracts to initiate the nucleation process; and (2) a thermal treatment to enable further solid-state growth of the nuclei. Transmission electron microscopy (TEM) and field emission scanning electron microscopy (FESEM) images provided direct evidence of the morphology of the nanorods and these images were used to propose nucleation and growth mechanisms...
May 22, 2017: Nanomaterials
Wei Zhang, Jiannian Li, Jie Zhang, Jinzhi Sheng, Ting He, Meiyue Tian, Yufeng Zhao, Changjun Xie, Liqiang Mai, Shichun Mu
To overcome inferior rate capability and cycle stability of MnO-based materials as a lithium-ion battery anode associated with the pulverization and gradual aggregation during the conversion process, we constructed robust mesoporous N-doped carbon (N-C) protected MnO nanoparticles on reduced graphene oxide (rGO) (MnO@N-C/rGO) by a simple top-down incorporation strategy. Such dual carbon protection endows MnO@N-C/rGO with excellent structural stability and enhanced charge transfer kinetics. At 100 mA g(-1), it exhibits superior rate capability as high as 864...
March 31, 2017: ACS Applied Materials & Interfaces
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