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MnO nanoparticle

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
Sajad Yazdani, Raana Kashfi-Sadabad, Alessandro Palmieri, William E Mustain, Michael Thompson Pettes
MnO is an electrically insulating material which limits its usefulness in lithium ion batteries. We demonstrate that the electrochemical performance of MnO can be greatly improved by using oxygen-functional groups created on the outer walls of multiwalled carbon nanotubes (MWCNTs) as nucleation sites for metal oxide nanoparticles. Based on the mass of the active material used in the preparation of electrodes, the composite conversion-reaction anode material Mn1-x Co x O/MWCNT with x = 0.2 exhibited the highest reversible specific capacity, 790 and 553 mAhg(-1) at current densities of 40 and 1600 mAg(-1), respectively...
April 18, 2017: Nanotechnology
Tyler E Stevens, Charles J Pearce, Caleah N Whitten, Richard P Grant, Todd C Monson
Many challenges must be overcome in order to create reliable electrochemical energy storage devices with not only high energy but also high power densities. Gaps exist in both battery and supercapacitor technologies, with neither one satisfying the need for both large power and energy densities in a single device. To begin addressing these challenges (and others), we report a process to create a self-assembled array of electrochemically active nanoparticles bound directly to a current collector using extremely short (2 nm or less) conductive tethers...
March 13, 2017: Scientific Reports
David McNulty, Hugh Geaney, Colm O'Dwyer
We present the formation of a carbon-coated honeycomb ternary Ni-Mn-Co-O inverse opal as a conversion mode anode material for Li-ion battery applications. In order to obtain high capacity via conversion mode reactions, a single phase crystalline honeycombed IO structure of Ni-Mn-Co-O material was first formed. This Ni-Mn-Co-O IO converts via reversible redox reactions and Li2O formation to a 3D structured matrix assembly of nanoparticles of three (MnO, CoO and NiO) oxides, that facilitates efficient reactions with Li...
February 10, 2017: Scientific Reports
Kyoungsuk Jin, Hongmin Seo, Toru Hayashi, Mani Balamurugan, Donghyuk Jeong, Yoo Kyung Go, Jung Sug Hong, Kang Hee Cho, Hirotaka Kakizaki, Nadège Bonnet-Mercier, Min Gyu Kim, Sun Hee Kim, Ryuhei Nakamura, Ki Tae Nam
The development of active water oxidation catalysts is critical to achieve high efficiency in overall water splitting. Recently, sub-10 nm-sized monodispersed partially oxidized manganese oxide nanoparticles were shown to exhibit not only superior catalytic performance for oxygen evolution, but also unique electrokinetics, as compared to their bulk counterparts. In the present work, the water-oxidizing mechanism of partially oxidized MnO nanoparticles was investigated using integrated in situ spectroscopic and electrokinetic analyses...
February 1, 2017: Journal of the American Chemical Society
Fei Cheng, Wen-Cui Li, An-Hui Lu
Numerous natural resources have a highly interconnected network with developed porous structure, so enabling directional and fast matrix transport. Such structures are appealing for the design of efficient anode materials for lithium-ion batteries, although they can be challenging to prepare. Inspired by nature, a novel synthesis route from biomass is proposed by using readily available auricularia as retractable support and carbon coating precursor to soak up metal salt solution. Using the swelling properties of the auricularia with the complexation of metal ions, a nitrogen-containing MnO@C nanoflake network has been easily synthesized with fast electrochemical reaction dynamics and a superior lithium storage performance...
October 6, 2016: ACS Applied Materials & Interfaces
Ming Zhong, Donghui Yang, Chenchao Xie, Zhang Zhang, Zhen Zhou, Xian-He Bu
Manganese oxides (MnOx ) are promising anode materials for lithium ion batteries, but they generally exhibit mediocre performances due to intrinsic low ionic conductivity, high polarization, and poor stability. Herein, yolk-shell nanorods comprising of nitrogen-doped carbon (N-C) coating on manganese monoxide (MnO) coupled with zinc manganate (ZnMn2 O4 ) nanoparticles are manufactured via one-step carbonization of α-MnO2 /ZIF-8 precursors. When evaluated as anodes for lithium ion batteries, MnO@ZnMn2 O4 /N-C exhibits an reversible capacity of 803 mAh g(-1) at 50 mA g(-1) after 100 cycles, excellent cyclability with a capacity of 595 mAh g(-1) at 1000 mAg(-1) after 200 cycles, as well as better rate capability compared with those non-N-C shelled manganese oxides (MnOx )...
August 26, 2016: Small
Shaojun Ma, Dongming Chen, Wen-Lou Wang
Nano-sized MnO intimately embedded in a porous carbon matrix has been synthesized by a facile method in which the manganese-salts/glycerol sol was used as the precursor. The glycerol plays roles of the chelating agent, the carbon source and the solvent. The X-ray diffraction (XRD) and Raman results indicate that the carbon layer may have an obvious effect on the microstructure of MnO. The first-principles density functional theory (DFT) calculations further reveal a considerable charge transfer from MnO to the carbon, leading to a decrease of lattice parameters of MnO and the bond length of Mn-O in the MnO/C composite...
July 28, 2016: Physical Chemistry Chemical Physics: PCCP
Y C Wang, W B Li, L Zhao, B Q Xu
Mixed cobalt and manganese oxides embedded in the nanoporous carbon framework (M/MO@C) were synthesized by the direct carbonization of a binary mixed-metal organic framework (CoMn-MOF-74) for the first time. The unique M/MO@C carbon materials maintained the primary morphology of CoMn-MOF-74, and showed a uniform dispersibility of Co, MnO and CoO nanoparticles in the carbon matrix, and therefore greatly increased the conductivity of the M/MO@C materials. A series of M/MO@C samples were tested as the electrode materials for supercapacitors, and a remarkable specific capacitance of 800 F g(-1) was obtained using the M/MO@C-700 sample at a current density of 1 A g(-1) in 6 M KOH electrolyte...
July 21, 2016: Physical Chemistry Chemical Physics: PCCP
Parasuraman Padmanabhan, Ajay Kumar, Sundramurthy Kumar, Ravi Kumar Chaudhary, Balázs Gulyás
UNLABELLED: Nanoparticles (NPs) are playing a progressively more significant role in multimodal and multifunctional molecular imaging. The agents like Superparamagnetic iron oxide (SPIO), manganese oxide (MnO), gold NPs/nanorods and quantum dots (QDs) possess specific properties like paramagnetism, superparamagnetism, surface plasmon resonance (SPR) and photoluminescence respectively. These specific properties make them able for single/multi-modal and single/multi-functional molecular imaging...
September 1, 2016: Acta Biomaterialia
Pongilat Remith, Nallathamby Kalaiselvi
Porous micro/nanostructures of earth abundant and ecobenign metals are emerging as advanced green materials for use in electrochemical energy storage devices. We present here the custom designed construction of a hybrid architecture containing porous MnO microspheres, formed out of hierarchically assembled nanoparticles using a template-free co-precipitation method, wherein the sacrificial template growth of porous spheres has been obtained by a solution mediated and time dependent oxidation strategy. The nanoporous channels in the MnO microspheres and the nanosized primary particles of MnO anodes in synergy increase the electrolyte percolation, resulting in a discharge capacity of 1200 mA h g(-1) at a current density of 50 mA g(-1) and a capacity as high as 450 mA h g(-1) under the 1000 mA g(-1) condition...
June 21, 2016: Physical Chemistry Chemical Physics: PCCP
Manuela Costanzo, Lucia Scolaro, Gloria Berlier, Alessandro Marengo, Sabrina Grecchi, Carlo Zancanaro, Manuela Malatesta, Silvia Arpicco
During the last decades, several studies have proposed manganese (Mn) complexes as alternative contrast agents for magnetic resonance imaging (MRI). With the nanotechnology surge in recent years, different types of Mn-based nanoparticles (Nps) have been developed. However, to design effective and safe administration procedures, preliminary studies on target cells, aimed at verifying their full biocompatibility and biodegradability, are mandatory. In this study, MnO containing-Nps encapsulated in a phospholipidic shell (PL-MnO Nps) were tested in cultured cells and flow cytometry; confocal and transmission electron microscopy were combined to understand the Nps uptake mechanism, intracellular distribution and degradation pathways, as well as possible organelle alterations...
July 11, 2016: International Journal of Pharmaceutics
Benedict You Wei Hsu, Michael Ng, Aaron Tan, John Connell, Thomas Roberts, Mark Lythgoe, Yu Zhang, Siew Yee Wong, Kishore Bhakoo, Alexander M Seifalian, Xu Li, John Wang
On page 721, X. Li, J. Wang, and co-workers report on a MnO-based fluorescence/MRI dual-modality nanoprobe for cancer imaging. While the encapsulated MnO nanoparticles can quench the fluorophores effectively prior to cellular uptake, fluorescence activation is triggered upon dissolution of the MnO nanoparticles to release Mn(2+) ions in the acidic lysosomal compartment of the cancer cells.
March 2016: Advanced Healthcare Materials
Benedict You Wei Hsu, Michael Ng, Aaron Tan, John Connell, Thomas Roberts, Mark Lythgoe, Yu Zhang, Siew Yee Wong, Kishore Bhakoo, Alexander M Seifalian, Xu Li, John Wang
Stimuli-responsive nanoprobes that combine both fluorescence and magnetic resonance imaging (MRI) are anticipated to be highly beneficial for tumor visualization with high imaging sensitivity. By employing an interfacial templating scheme, a pH-activatable fluorescence/MRI dual-modality imaging nanoprobe is successfully developed based on the coencapsulation of MnO nanoparticles and coumarin-545T inside a hybrid silica nanoshell. To promote cancer cell targeting with high-specificity, the nanoprobes are also conjugated with folic acid to establish a greater affinity for cancer cells that over-express folate receptors on their cell membrane...
March 2016: Advanced Healthcare Materials
Wei Wei, Yongcheng Wang, Hao Wu, Abdullah M Al-Enizi, Lijuan Zhang, Gengfeng Zheng
We report a general synthetic method for transition metal oxide (TMO) hierarchical nanotube (HNT) structures by a solution-phase cation exchange method from Cu2O nanowire templates. This method leads to the formation of hollow, tubular backbones with secondary, thin nanostructures on the tube surface, which substantially increases the surface reactive sites for electrolyte contacts and electrochemical reactions. As proofs-of-concept, several representative first-row TMO HNTs have been synthesized, including CoOx, NiOx, MnOx, ZnOx and FeOx, with specific surface areas much larger than nanotubes or nanoparticles of corresponding materials...
January 15, 2016: Nanotechnology
Rui Chen, Daishun Ling, Lin Zhao, Shuaifei Wang, Ying Liu, Ru Bai, Seungmin Baik, Yuliang Zhao, Chunying Chen, Taeghwan Hyeon
Magnetic resonance imaging (MRI) contrast agents with high relaxivity are highly desirable because they can significantly increase the accuracy of diagnosis. However, they can be potentially toxic to the patients. In this study, using a mouse model, we investigate the toxic effects and subsequent tissue damage induced by three T1 MRI contrast agents: gadopentetate dimeglumine injection (GDI), a clinically used gadolinium (Gd)-based contrast agent (GBCAs), and oxide nanoparticle (NP)-based contrast agents, extremely small-sized iron oxide NPs (ESIONs) and manganese oxide (MnO) NPs...
December 22, 2015: ACS Nano
Xin Zhao, Yuxuan Du, Lei Jin, Yang Yang, Shuilin Wu, Weihan Li, Yan Yu, Yanwu Zhu, Qinghua Zhang
Freestanding yet flexible membranes of MnO/carbon nanofibers are successfully fabricated through incorporating MnO2 nanowires into polymer solution by a facile electrospinning technique. During the stabilization and carbonization processes of the as-spun membranes, MnO2 nanowires are transformed to MnO nanoparticles coincided with a conversion of the polymer from an amorphous state to a graphitic structure of carbon nanofibers. The hybrids consist of isolated MnO nanoparticles beading in the porous carbon and demonstrate superior performance when being used as a binder-free anode for lithium-ion batteries...
2015: Scientific Reports
Jong Seob Choi, Jong Young Choi, Hyon Bin Na, Tae Seok Seo
The objective of this study was to assess cytotoxicity of engineered MnO nanoparticles by quantifying the reactive oxygen species (ROS) related genes (glutathione S-transferase (GST) and catalase) using real time-polymerase chain reaction (RT-PCR) and molecular beacon (MB) technologies. Monodisperse MnO nanoparticles of 14 nm in size were synthesized by the encapsulation of polyethyleneglycol (PEG)-phospholipid shell around the MnO core to endow high water-dispersibility and biocompatibility. In vitro cytotoxicity was evaluated at different concentrations (10, 50 and 100 μg/ml) and incubation times (12, 24 and 48 h) with human cancer cell lines (glioblastoma, lung adenocarcinoma and neuroblastoma cells)...
June 2015: Journal of Nanoscience and Nanotechnology
Kun Zhang, Hangrong Chen, Pei Li, Xiaowan Bo, Xiaolong Li, Zeng Zeng, Huixiong Xu
Despite great efforts having been devoted to the design of multimodal imaging probe, almost all design principles of nanotheranostic agents subordinate to simple assemblies of building blocks, resulting in complex preparation process and discounted ability, that is, 1 + 1 < 2. In this report, a novel design strategy, marriage of structure design and composition design that can maximize imaging ability of each building block, ultimately achieving 1 + 1 ≥ 2, has been established. Moreover, a high-efficient ultrasound (US) & MR & CT trimodal contrast agent acts as model to instantiate this design strategy, wherein nanoparticles-induced nonlinear scattering and rattle-type structure-induced double scattering enhancing US imaging, and uniform distribution of Mn(2+) paramagentic centers and "core-satellite" structure of Au atoms favoring enhanced MR imaging and CT imaging, respectively have been validated, achieving optimization of structure design...
August 26, 2015: ACS Applied Materials & Interfaces
Ning Chen, Chen Shao, Shuai Li, Zihao Wang, Yanming Qu, Wei Gu, Chunjiang Yu, Ling Ye
The fusion of molecular and anatomical modalities facilitates more reliable and accurate detection of tumors. Herein, we prepared the PEG-Cy5.5 conjugated MnO nanoparticles (MnO-PEG-Cy5.5 NPs) with magnetic resonance (MR) and near-infrared fluorescence (NIRF) imaging modalities. The applicability of MnO-PEG-Cy5.5 NPs as a dual-modal (MR/NIRF) imaging nanoprobe for the detection of brain gliomas was investigated. In vivo MR contrast enhancement of the MnO-PEG-Cy5.5 nanoprobe in the tumor region was demonstrated...
November 1, 2015: Journal of Colloid and Interface Science
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