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MnO nanoparticle

Junyong Wang, Qinglin Deng, Mengjiao Li, Cong Wu, Kai Jiang, Zhigao Hu, Junhao Chu
To overcome inferior rate capability and cycle stability of MnO-based anode materials for lithium-ion batteries (LIBs), we reported a novel 3D porous MnO@GS/CNT composite, consisting of MnO nanoparticles homogeneously distributed on the conductive interconnected framework based on 2D graphene sheets (GS) and 1D carbon nanotubes (CNT). The distinctive architecture offers highly interpenetrated network along with efficient porous channels for fast electron transfer and ionic diffusion as well as abundant stress buffer space to accommodate the volume expansion of the MnO nanoparticles...
May 14, 2018: Nanotechnology
Qaisar Nawaz, Muhammad Atiq Ur Rehman, Andreas Burkovski, Jochen Schmidt, Ana M Beltrán, Ameen Shahid, Nina K Alber, Wolfgang Peukert, Aldo R Boccaccini
Mesoporous bioactive glass (BG) nanoparticles based in the system: SiO2 -P2 O5 -CaO-MnO were synthesized via a modified Stöber process at various concentrations of Mn (0-7 mol %). The synthesized manganese-doped BG nanoparticles were characterized in terms of morphology, composition, in vitro bioactivity and antibacterial activity. Scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Brunauer-Emmett-Teller (BET) analysis confirmed that the particles had spherical morphology (mean particle size: 110 nm) with disordered mesoporous structure...
May 8, 2018: Journal of Materials Science. Materials in Medicine
Weiren Xia, Heng Wu, Piaojie Xue, Xinhua Zhu
We report on microstructural, magnetic, and optical properties of Pr-doped perovskite manganite (La1 - x Prx )0.67 Ca0.33 MnO3 (LPCMO, x = 0.0-0.5) nanoparticles synthesized via sol-gel process. Structural characterizations (X-ray and electron diffraction patterns, (high resolution) TEM images) provide information regarding the phase formation and the single-crystalline nature of the LPCMO systems. X-ray and electron diffraction patterns reveal that all the LPCMO samples crystallize in perovskite crystallography with an orthorhombic structure (Pnma space group), where the MnO6 octahedron is elongated along the b axis due to the Jahn-Teller effect...
May 4, 2018: Nanoscale Research Letters
Aiyun Meng, Liuyang Zhang, Bei Cheng, Jiaguo Yu
Photocatalytic CO2 conversion into solar fuels has an alluring prospect. However, the rapid recombination of photogenerated electron-hole pairs for TiO2 -based photocatalyst hinders its wide application. To alleviate this bottleneck, a ternary hybrid TiO2 -MnO x -Pt composite is excogitated. Taking advantage of the surface junction between {001} and {101} facets, MnO x nanosheets and Pt nanoparticles are selectively deposited on each facet by a facile photodeposition method. This design accomplishes the formation of two heterojunctions: p-n junction between MnO x and TiO2 {001} facet and metal-semiconductor junction between Pt and TiO2 {101} facet...
May 2, 2018: ACS Applied Materials & Interfaces
Dan Zhang, Liping Li, Guangshe Li, Jianming Fan, Baoyun Li
The practical applications of Mn3O4 in lithium ion batteries are greatly hindered by fast capacity decay and poor rate performance resulting from the significant volume change and low electrical conductivity. It is believed that the synthesis of nano-scaled Mn3O4 combined with carbonaceous matrix will lead to a better electrochemical performance. Herein, we report a convenient route for the synthesis of Mn3O4 nanoparticles grown in situ on hollow carbon nanofiber (denoted as HCF/Mn3O4). The small size of Mn3O4 particles combined with HCF can significantly alleviate volume change and elevate electrical conductivity; the strong chemical interaction between HCF and Mn3O4 would improve the reversibility of conversion reaction for MnO to Mn3O4 and accelerate the charge transfer...
April 26, 2018: Chemistry: a European Journal
Hong Wei, Dawei Pan, Xueping Hu, Ming Liu, Haitao Han, Dazhong Shen
Anodic stripping voltammetric determination of copper ions was accomplished at a glassy carbon disk electrode modified with core-shell microspheres of the gold@manganese dioxide (Au@MnO2 ) type. These were synthesized via electrochemical deposition. The gold nanoparticles (AuNPs) were electrochemically deposited and employed as an active support material for the growth of MnO2 to yield Au@MnO2 core-shell particles with unique and regular spherical morphology. The microspheres have a diameter of 200-250 nm and scrolled edges like a cactus...
April 21, 2018: Mikrochimica Acta
Junxin Lai, Tingjian Wang, Hao Wang, Fengqiang Shi, Wei Gu, Ling Ye
The authors describe MnO nanoparticles (NPs) with unique excitation-dependent fluorescence across the entire visible spectrum. These NPs are shown to be efficient optical nanoprobe for multicolor cellular imaging. Synthesis of the NPs is accomplished by a thermal decomposition method. The MnO NPs exhibit a high r1 relaxivity of 4.68 mM-1  s-1 and therefore give an enhanced contrast effect in magnetic resonance (MR) studies of brain glioma. The cytotoxicity assay, hemolysis analysis, and hematoxylin and eosin (H&E) staining tests verify that the MnO NPs are biocompatible...
April 2, 2018: Mikrochimica Acta
Mahmoud Amouzadeh Tabrizi, Mojtaba Shamsipur, Reza Saber, Saeed Sarkar
Herein, aptamer-modified self-propelled nanomotors were used for transportation of human promyelocytic leukemia cells (HL-60) from a human serum sample. For this purpose, the fabricated manganese oxide nanosheets-polyethyleneimine decorated with nickel/gold nanoparticles (MnO2 -PEI/Ni/Au) as nanomotors were added to a vial containing thiolated aptamer KH1C12 solution as a capture aptamer to attach to the gold nanoparticles on the surface of nanomotors covalently. The aptamer-modified self-propelled nanomotors (aptamerKH1C12 /nanomotors) were then separated by placing the vial in a magnetic stand...
March 17, 2018: Biosensors & Bioelectronics
Qingqing Tan, Ruirui Zhang, Rongmei Kong, Weisu Kong, Wenzhi Zhao, Fengli Qu
The authors describe a novel method for the determination of glutathione (GSH). Detection is based on target induced release of glucose from MnO2 nanosheet-gated aminated mesoporous silica nanoparticles (MSNs). In detail, glucose is loaded into the pores of MSNs. Negatively charged MnO2 nanosheets are assembled on the MSNs through electrostatic interactions. The nanosheets are reduced by GSH, and this results in the release of glucose which is quantified by using a commercial electrochemical glucose meter. GSH can be quantified by this method in the 100 nM to 10 μM concentration range, with a 34 nM limit of detection...
December 8, 2017: Mikrochimica Acta
Wenqiang Lai, Qiao Zeng, Juan Tang, Maosheng Zhang, Dianping Tang
The authors describe a colorimetric immunoassay for the model nalyte aflatoxin B1 (AFB1 ). It is based on the just-in-time generation of an MnO2 nanocatalyst. Unlike previously developed immunoassay, the chromogenic reaction relies on the just-in-time formation of an oxidase mimic without the aid of the substrate. Potassium permanganate (KMnO4 ) is converted into manganese dioxide (MnO2 ) which acts as an oxidase mimic that catalyzes the oxidation 3,3',5,5'-tetramethylbenzidine (TMB) by oxygen to give a blue colored product...
January 10, 2018: Mikrochimica Acta
Hong Zhang, Tingjian Wang, Yuanyuan Zheng, Changxiang Yan, Wei Gu, Ling Ye
The albumin-templated Gd2 O3 and MnO2 nanoparticles (NPs) have been developed as a new type of magnetic resonance (MR) T1 contrast agents. However, their potential toxicity and applicability for MR imaging of brain gliomas has not been fully explored so far. In this study, we prepared Gd2 O3 @BSA and MnO2 @BSA nanoparticles (NPs) and investigated their toxicity comprehensively and comparatively by H&E staining, blood biochemical analysis, and adverse outcome pathways testing. It is revealed that both Gd2 O3 @BSA and MnO2 @BSA NPs are biocompatibility at a rational dose level...
March 23, 2018: Biochemical and Biophysical Research Communications
Xueqin Bao, Zhen Qin, Tianshu Zhou, Jingjing Deng
In this work, the gold nanoparticles (Au-NPs) were in-situ generated on the surface of MnO2 nanosheets to form MnO2 /Au-NPs nanocomposite in a simple and cost-effective way. Multiple experiments were carried out to optimize the oxidation of basic dye (Methylene Blue (MB)), including the molar ratio of MnO2 to chloroauric acid (HAuCl4 ), the pH of the solution and the effect of initial material. Under the optimal condition, the highest degradation efficiency for MB achieved to 98.9% within 60 min, which was obviously better than commercial MnO2 powders (4...
March 2018: Journal of Environmental Sciences (China)
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 M 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...
May 25, 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...
March 1, 2018: Colloids and Surfaces. B, Biointerfaces
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