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MnO nanoparticle

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, 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...
December 28, 2016: 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...
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
Haitao Huang, Tao Yue, Ke Xu, Jafar Golzarian, Jiahui Yu, Jin Huang
Gd(III) chelate is currently used as positive magnetic resonance imaging (MRI) contrast agent in clinical diagnosis, but generally induces the risk of nephrogenic systemic fibrosis (NSF) due to the dissociated Gd(3+) from Gd(III) chelates. To develop a novel positive MRI contrast agent with low toxicity and high sensitivity, ultrasmall MnO nanoparticles were PEGylated via catechol-Mn chelation and conjugated with cRGD as active targeting function to tumor. Particularly, the MnO nanoparticles with a size of ca...
July 1, 2015: Colloids and Surfaces. B, Biointerfaces
Eun Ji Yoo, Il Kwon Shin, Tae Sik Yoon, Young Jin Choi, Chi Jung Kang
Binary transition metal oxides such as ZnO, TiO2, and MnO; and their various structures such as thin film, nanowire, and nanoparticle assembly; have been widely investigated for use in insulators in resistive random access memory (ReRAM), considered a next-generation nonvolatile memory device. Among the various driving mechanisms of resistive switching in insulating materials, the conductive filament model is one of the most widely accepted. Studies on spatially confined structures such as one-dimensional nanostructures and zero-dimensional nanoparticles to reveal the detailed filament constructing mechanism are warranted because low-dimensional nanostructures can provide more localized properties with a narrow dispersion of operational parameter values compared with thin-film structures...
December 2014: Journal of Nanoscience and Nanotechnology
Azhar Z Abbasi, Preethy Prasad, Ping Cai, Chunsheng He, Warren D Foltz, Mohammad Ali Amini, Claudia R Gordijo, Andrew M Rauth, Xiao Yu Wu
Multifunctional nanoparticles (NPs) have found important applications in diagnosis, chemotherapy, and image-guided surgery of tumors. In this work, we have developed polymeric theranostic NPs (PTNPs) containing the anticancer drug docetaxel (DTX), a fluorescent dye, and magnetic manganese oxide (MnO) NPs for dual modal imaging and chemotherapy. PTNPs ~150 nm in diameter were synthesized by co-loading hydrophobic DTX and MnO NPs ~5 nm in diameter, into the matrix of a fluorescent dye-labeled amphiphilic polymer...
July 10, 2015: Journal of Controlled Release: Official Journal of the Controlled Release Society
M P Moshkin, D V Petrovskiĭ, A E Akulov, A V Romashchenko, L A Gerlinskaia, M I Muchnaia, V L Ganimedov, A S Sadovskiĭ, A A Savelov, I V Koptiug, S Iu Troitskiĭ, V I Bukhtiiarov, N A Kolchanov, R Z Sagdeev, V M Fomin
In subterranean rodents, which dig down the passages with frontal teeth, adaptation to the underground mode of life presumes forming of mechanisms that provide protection against inhaling dust particles of different size when digging. One of such mechanisms can be specific pattern of air flow organization in the nasal cavity. To test this assumption, comparative study of geometry and aerodynamics of nasal passages has been conducted with regard to typical representative of subterranean rodents, the mole vole, and a representative of ground rodents, the house mouse...
May 2014: Zhurnal Obshcheĭ Biologii
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