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Yimei Zhang, Fei Wang, Ping Ou, Hao Zhu, Yuxian Lai, Yalong Zhao, Weilin Shi, Zhuang Chen, Shuai Li, Tong Wang
In this research, a novel efficiency MnO2 @Nano hollow carbon sphere (MnO2 @NHCS) nanocomposite was prepared by one-pot hydrothermal reaction with KMnO4 solution. The adsorption and oxidization performance of MnO2 @NHCS were assessed by degradation of bisphenol A (BPA) at different conditions. The effect of dosage of MnO2 @NHCS, pH, initial concentration of BPA, temperature and humic acid were investigated systematically. Moreover, the characterizations of MnO2 @NHCS were measured by a series of techniques, such as XRD, FESEM, HRTEM, TGA and XPS...
August 2, 2018: Journal of Hazardous Materials
Suona Zhang, Leonardo Gutierrez, Xi-Zhi Niu, Fei Qi, Jean-Philippe Croue
The influence of dissolved organic matter (DOM) properties on its interfacial interactions with MnO2 and on catalytic oxidation processes was studied by Time-Resolved Dynamic Light Scattering (TR-DLS) and Atomic Force Microscopy (AFM) under varied solution conditions. Four DOM fractions of different characteristics (e.g., SUVA, hydrophobic character, structural properties) were selected. Bared-MnO2 nanoparticles readily aggregated in NaCl and CaCl2 solutions. Classic DLVO Theory successfully described critical coagulation concentrations and aggregation behaviors...
October 2018: Chemosphere
Yongbeom Seo, Jiayu Leong, Jun Dong Park, Yu-Tong Hong, Sang-Hyon Chu, Cheol Park, Dong Hyun Kim, Yu-Heng Deng, Vitaliy Dushnov, Joonghui Soh, Simon Rogers, Yi Yan Yang, Hyunjoon Kong
Bacterial biofilms form on and within many living tissues, medical devices, and engineered materials, threatening human health and sustainability. Removing biofilm remains a grand challenge despite tremendous efforts made so far, particularly when they are formed in confined spaces. One primary cause is the limited transport of anti-bacterial agents into extracellular polymeric substances (EPS) of the biofilm. In this study, we hypothesized that a microparticle engineered to be self-motile with microbubbles would clean a structure fouled by biofilm by fracturing the EPS and subsequently improving transports of the antiseptic reagent...
August 14, 2018: ACS Applied Materials & Interfaces
Tao Zhao, Guoming Zhang, Fangshuo Zhou, Sen Zhang, Chao Deng
Rechargeable Zn-ion batteries are promising candidates for wearable energy storage devices. However, their performance is severely restricted by the low conductivity and inferior mass loading. Herein, a new type of the textile based electrodes with 3D hierarchical branched design is reported. Both Ni nanoparticles and carbon nanotubes are used to build conductive coatings on the textiles. The 3D hierarchical nanostructures, consisting of the vertical-aligned nanosheets and the fluffy-like small flakes, grow on the conductive textiles to form the self-supported electrodes...
August 14, 2018: Small
Asghar Ashrafi Hafez, Parvaneh Naserzadeh, Khadijeh Ashtari, Amir Mohammad Mortazavian, Ahmad Salimi
Metal nanoparticles (NPs) have been extensively used in industry as well as in biomedical application. Manganese oxide-nanoparticles (MnO2 -NPs) one of these materials, have many applications. This study was designed to evaluate the protective role of vitamin D against MnO2 -NPs -induced toxicity in the BALB c mice. These mice were randomly assigned to 4 (n = 10). In this study, MnO2 -NPs (10 mg/kg), vitamin D (10 mg/kg) and MnO2 -NPs plus vitamin D were administered interperitoneally once daily for 50 consecutive days...
August 10, 2018: Regulatory Toxicology and Pharmacology: RTP
Lingtong Meng, Yali Cheng, Xiaoning Tong, Shaoju Gan, Yawen Ding, Yu Zhang, Chao Wang, Lei Xu, Yishen Zhu, Jinhui Wu, Yiqiao Hu, Ahu Yuan
Hypoxia, and hypoxia-inducible factor-1 (HIF-1), can induce tumor resistance to radiation therapy. To overcome hypoxia-induced radiation resistance, recent studies have described nano-systems to improve tumor oxygenation for immobilizing DNA damage and simultaneously initiate oxygen-dependent HIF-1α degradation. However, HIF-1α degradation is incomplete during tumor oxygenation treatment alone. Therefore, tumor oxygenation combined with residual HIF-1 functional inhibition is crucial to optimizing therapeutic outcomes of radiotherapy...
August 13, 2018: ACS Nano
Bushra Tehseen, Asma Rehman, Muniba Rahmat, Haq Nawaz Bhatti, Aiguo Wu, Faheem K Butt, Gul Naz, Waheed S Khan, Sadia Z Bajwa
This work is the first report describing the solution grown 3D manganese oxide nanofibrous (MnO2 NFs) mesh and its potential for the simultaneous detection of biomolecules such as ascorbic acid and uric acid. The mesh is synthesized by a facile, one-pot, and cost-effective hydrothermal approach without using any template or structure directing compound. The morphology consists of randomly placed nanofibres possessing a diameter in the range of 10-25 nm, and length of several micron; constituting a highly porous and flexible material...
October 15, 2018: Biosensors & Bioelectronics
Xin-An Yang, Meng-Ting Shi, Di Leng, Wang-Bing Zhang
Fe3 O4 @MnO2 magnetic composite microsphere with hierarchical shells structure has been synthesized through a facile two-step hydrothermal reaction for ultra-trace arsenic enrichment. Scanning electron microscopy and transmission electron microscopy images clearly indicated that the as-synthesized material is a porous hydrangea-like morphology, as well as the size of the composite microspheres and the widths of pore are related to the reaction conditions. The N2 adsorption-desorption isotherms demonstrated that the specific surface areas and pore volume of Fe3 O4 @MnO2 with 8 h hydrothermal synthesis are 121...
November 1, 2018: Talanta
Chao Liu, Juying Hou, Geoffrey I N Waterhouse, Lin Cui, Jing Dong, Shiyun Ai
A novel pH-responsive sandwich-type electrochemiluminescence immunosensor was successfully developed for the detection of avian leukosis virus subgroup J (ALV-J). The immunosensor consisted of graphene oxide functionalized with tannic acid (rGO-TA) and primary antibodies (Ab1 ) as the main ALV-J sensing platform. For signal amplification, pH-responsive hollow MnO2 (hMnO2 ) nanospheres encapsulating Ru(bpy)3 Cl2 and carrying secondary antibodies (Ab2 ) were employed. Under optimal conditions, the immunosensor exhibited a wide ALV-J detection range of 101...
July 18, 2018: Biosensors & Bioelectronics
Luodan Yu, Ping Hu, Yu Chen
The fast advances of theranostic nanomedicine enable the rational design and construction of diverse functional nanoplatforms for versatile biomedical applications, among which gas-generating nanoplatforms (GGNs) have emerged very recently as unique theranostic nanoplatforms for broad gas therapies. Here, the recent developments of the rational design and chemical construction of versatile GGNs for efficient gas therapies by either exogenous physical triggers or endogenous disease-environment responsiveness are reviewed...
July 31, 2018: Advanced Materials
Wenbo Shi, Bo Song, Wenjing Shi, Xiaodan Qin, Zhiwei Liu, Mingqian Tan, Liu Wang, Fengling Song, Jingli Yuan
Bimodal fluorescence-magnetic resonance imaging (MRI) technique has shown great utilities in bioassays because it combines the advantages of both optical imaging and MRI to provide more sufficient information over any modality alone. In this work, on the basis of a MnO2 nanosheet-Ru(II) complex nanoarchitecture, a bimodal phosphorescence-MRI nanoprobe for glutathione (GSH) has been constructed. The nanoprobe, Ru(BPY)3 @MnO2 , was constructed by integrating MnO2 nanosheets with a phosphorescent Ru(II) complex [Ru(BPY)3 ](PF6 )2 (BPY = 2,2'-bipyridine), which resulted in complete phosphorescence quenching of the Ru(II) complex, accompanied by very low longitudinal and transverse relaxivity...
August 13, 2018: ACS Applied Materials & Interfaces
Aline D Gabbardo, Xi Wang, Angeire Huggins, G S Frankel
5xxx series aluminum alloys, as Al-4.5Mg-1.0Mn (AA5083), are strengthened by Mg solid solution and work hardening. A drawback of this alloy is the fact that β phase, Al3Mg2, can precipitate on grain boundaries causing sensitization and intergranular corrosion, which is detrimental to the integrity of the structure. Metallography is an important technique to study the grain structure and highly sought for intergranular corrosion evaluation; however, revealing the grains of completely un-sensitized AA5083 is challenging...
July 26, 2018: Microscopy and Microanalysis
Ming-Hao Hsu, Ting-Hao Kuo, Yung-En Chen, Ching-Hua Huang, Cheng-Chih Hsu, Angela Yu-Chen Lin
Cefotaxime (CTX), cephalexin (CFX), cephradine (CFD), cephapirin (CFP), and cefazolin (CFZ) were selected as target cephalosporin antibiotics to study their oxidative transformation by δ-MnO2 . Although they all have the same core structure (7-aminodesacetoxycephalosporanic acid), very different MnO2 oxidation rates were observed at pH 4 (the initial reaction rate constant kinit ranged from 0.014 to 2.6 h-1 ). An extensive investigation of the substructure compounds and byproduct analysis revealed that the oxidation mainly occurred at the following two sites on the core structure: (1) the sulfur atom in the cephem ring and (2) the carbon-carbon double bond (C═C) and its proximal carboxylic acid group...
August 6, 2018: Environmental Science & Technology
Shunyu Yao, Lei Xing, Yidi Dong, Xiang Wu
In this work, for the first time we report a kind of novel WO3 @MnWO4 core-shell structure prepared by a facile and cost-effective solution route. The core-shell structure consists of WO3 nanowire array as the core and MnWO4 nanosheets as the shell. The as-synthesized hybrid structures as the supercapacitor negative electrodes possess remarkably enhanced specific capacitance. By matching with MnO2 nanosheets as the positive electrode, a 2 V voltage asymmetric supercapacitor is assembled, which reveals an excellent rate capability with 92...
July 19, 2018: Journal of Colloid and Interface Science
Xiong Song, Guoping Chen, Suqing Wang, Yuping Huang, Zhouyang Jiang, Liang-Xin Ding, Haihui Wang
Separator modification has been proved to be an effective approach for overcoming lithium polysulfide (LiPS) shuttling in lithium-sulfur (Li-S) cells. However, the weight and stability of the modified layer also affect the cycling properties and the energy density of Li-S cells. Here, we initially construct an ultrathin and lightweight MnO2 layer (380 nm, 0.014 mg cm-2 ) on a commercial polyethylene (PE) separator (MnO2 @PE) through a chemical self-assembly method. This MnO2 layer is tightly anchored onto the PE substrate because of the presence of oxygen-containing groups that form a relatively strong chemical force between the MnO2 nanoparticles and the PE substrate...
August 8, 2018: ACS Applied Materials & Interfaces
Jun Zhai, Quanfeng Wang, Qing Li, Bo Shang, Md Hasibur Rahaman, Jialiang Liang, Jiucui Ji, Wenbo Liu
Carbamazepine (CBZ), a widely used antiepileptic drug, is refractory to biological wastewater treatment. Rapid removal of CBZ is possible using synthetic manganese oxide (δ-MnO2 ) but the removal mechanisms require further investigation. In this study, CBZ degradation by δ-MnO2 was carried out at different pH to further explore the degradation mechanisms. Results show that CBZ degradation by δ-MnO2 was highly pH dependent, and rapid degradation occurred when pH <2.8. Based on the density functional theory calculations, increasing [H+ ] not only increased the reactivity of δ-MnO2 , but also enhanced the secondary reactions of the intermediates...
November 1, 2018: Science of the Total Environment
Yi Min Chen, Bao Zhi Yu, Yu Qing Miao, Fei Gao, Guang Yin Jing, Hai Ming Fan
Three-dimensional hierarchical metal oxide core/shell nanowire arrays (HMONAs) have become promising pseudocapacitive materials due to their integrated smart architectures. However, these core/shell nanostructures have unsatisfactory structural stability and frequently suffer destruction during their fabrication process and their charge-discharge cycles, thus limiting their application lifespan. Herein, a general strategy based on the minimization of the lattice mismatch between the shell and the backbone at the nanoscale interface has been proposed to improve the cycling stability of the HMONAs...
August 7, 2018: Nanoscale
Zishun Li, Xuekun Tang, Kun Liu, Jing Huang, Yueyang Xu, Qian Peng, Minlin Ao
Heterogeneous Fenton-like catalysts with the activation of peroxymonosulfate (PMS), which offer the advantages of fast reaction rate, wide functional pH range and cost efficiency, have attracted great interest in wastewater treatment. In this study, a novel magnetic MnO2 /Fe3 O4 /diatomite nanocomposite is synthesized and then used as heterogeneous Fenton-like catalyst to degrade the organic pollutant methylene blue (MB) with the activation of PMS. The characterization results show that the Fe3 O4 nanoparticles and nanoflower-like MnO2 are evenly distributed layer-by-layer on the surface of diatomite, which can be readily magnetically separated from the solution...
2018: Beilstein Journal of Nanotechnology
Yan Li, Kai Song, Yu Cao, Chen Peng, Guang Yang
Keratin is a family of cysteine-rich structural fibrous proteins abundantly present in skin and skin appendages. Inspired by the template synthesis strategy, in this work, keratin was utilized for the first time as a platform template to synthesize metallic oxide nanoparticles, such as MnO2 (MnNPs@Keratin) and Gd2 O3 (GdNPs@Keratin), in a simple and environment-benign fashion. These nanoparticles possess good colloid stability and biocompatibility, high T1 relaxivity ( r1 value = 6.8 mM-1 s-1 for MnNPs@Keratin and 7...
July 26, 2018: ACS Applied Materials & Interfaces
Sesi Li, Yunhao Zhao, Zhengwang Liu, Liting Yang, Jie Zhang, Min Wang, Renchao Che
The ingenious design of a freestanding flexible electrode brings the possibility for power sources in emerging wearable electronic devices. Here, reduced graphene oxide (rGO) wraps carbon nanotubes (CNTs) and rGO tightly surrounded by MnO2 nanosheets, forming a 3D multilevel porous conductive structure via vacuum freeze-drying. The sandwich-like architecture possesses multiple functions as a flexible anode for lithium-ion batteries. Micrometer-sized pores among the continuously waved rGO layers could extraordinarily improve ion diffusion...
July 15, 2018: Small
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