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Sima Heidari, Mohammad Mahdi Najafpour, Małgorzata Hołyńska, Jitendra Pal Singh, Keun Hwa Chae, Masoumeh Khatamian
For the first time, using scanning electron microscopy, transmission electron microscopy, X-ray absorption near edge structure and extended X-ray absorption fine structure X-ray diffraction, it is showed that MnCO3, MnWO4, Mn3(PO4)2·3H2O, MnS and Mn(VO3)2·xH2O under the water-oxidation conditions and in the presence of cerium(iv) ammonium nitrate, are converted to Mn oxide without a high-range order. A mechanism is proposed for such conversion and as Mn oxide is an efficient water-oxidizing catalyst, it is thus a candidate as a contributor to the observed catalytic activity...
January 11, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Thirada Piyanan, Anan Athipornchai, Charles S Henry, Yupaporn Sameenoi
This work reports a portable distance-based detection paper device that has a thermometer-like shape for rapid, instrument-free determination of antioxidant activity using a nanoceria assay. The assay is based on partial reduction of cerium ion from Ce4+ to Ce3+ on nanoceria deposited along the detection channel by antioxidants present in food, giving highly reactive oxidation products. Either these products or the parent antioxidant compounds could then bind to the OH-rich ceria nanoparticles and generate charge transfer ceria-antioxidant complexes resulting in a yellow to brown color change...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
Chi Yao, Wenxing Wang, Peiyuan Wang, Mengyao Zhao, Xiaomin Li, Fan Zhang
Tumor hypoxia is typically presented in the central region of solid tumors, which is mainly caused by an inadequate blood flow and oxygen supply. In the conventional treatment of hypoxic human tumors, not only the oxygen-dependent photodynamic therapy (PDT), but also antitumor drug-based chemotherapy, is considerably limited. The use of direct oxygen delivering approach with oxygen-dependent PDT or chemotherapy may potentiate the reactive oxygen species (ROS)-mediated cytotoxicity of the drug toward normal tissues...
January 8, 2018: Advanced Materials
Justyna Modrzynska, Trine Berthing, Gitte Ravn-Haren, Nicklas Raun Jacobsen, Ingrid Konow Weydahl, Katrin Loeschner, Alicja Mortensen, Anne Thoustrup Saber, Ulla Vogel
BACKGROUND: Little is known about the mechanism underlying the genotoxicity observed in the liver following pulmonary exposure to carbon black (CB) nanoparticles (NPs). The genotoxicity could be caused by the presence of translocated particles or by circulating inflammatory mediators released during pulmonary inflammation and acute-phase response. To address this, we evaluated induction of pulmonary inflammation, pulmonary and hepatic acute-phase response and genotoxicity following exposure to titanium dioxide (TiO2), cerium oxide (CeO2) or CB NPs...
January 3, 2018: Particle and Fibre Toxicology
Jiuying Tian, Wenqi Wei, Jiawen Wang, Saijie Ji, Guichan Chen, Jusheng Lu
In the present work, colloidal cerium oxide nanoparticles (nanoceria) and graphene quantum dots (GQDs) were firstly synthesized by sol-gel method and pyrolysis respectively, which all have a uniform nano-size and significant fluorescence emission. Due to the fluorescence emission spectrum of nanoceria overlapped the absorption spectrum of GQDs, fluorescence resonance energy transfer (FRET) between nanoceria and GQDs could occur effectively by the electrostatic interaction. Based on it, a sensitive ratiometric fluorescence aptasensor for the determination of ochratoxin A (OTA), a small molecular mycotoxin produced by Aspergillus and Penicillium strains, has been successfully constructed...
February 13, 2018: Analytica Chimica Acta
Eudald Casals, Muriel F Gusta, Jordi Piella, Gregori Casals, Wladimiro Jiménez, Victor Puntes
[This corrects the article on p. 970 in vol. 8, PMID: 28855907.].
2017: Frontiers in Immunology
Ariel R Donovan, Craig D Adams, Yinfa Ma, Chady Stephan, Todd Eichholz, Honglan Shi
In this study, aluminum sulfate, ferric sulfate, ferric chloride, and poly(diallyldimethylammonium chloride) (pDADMAC) coagulation removal of citrate-stabilized silver and gold nanoparticles (NPs) and uncoated titanium dioxide, cerium dioxide, and zinc oxide NPs was investigated using a single particle (SP) ICP-MS direct monitoring technique. Zone 2 (charge neutralization) coagulation was performed in river water and more commonly used Zone 4 (sweep floc) coagulation was performed in both river and lake water with environmentally relevant concentrations of selected NPs added...
December 19, 2017: Chemosphere
Anna C Duke, Martin Hermus, Jakoah Brgoch
Following an investigation proving La2Si4N6C crystallizes in a monoclinic space group, isostructural to Y2Si4N6C, the reportedly hexagonal (La0.5Y0.5)2Si4N6C was reinvestigated to examine the apparent crystal structure change across the solid solution. Initially, calculating the electronic structure and phonon density of states of (La0.5Y0.5)2Si4N6C in the P63mc space group revealed an imaginary phonon mode, which is indicative of a structural instability. Displacing the atoms along the pathway of the imaginary vibration led to a previously unreported space group for carbonitridosilicates, trigonal P31c...
December 20, 2017: Inorganic Chemistry
Meng-Hsuen Chiu, Zafir A Khan, Santiago G Garcia, Andre D Le, Agnes Kagiri, Javier Ramos, Shih-Ming Tsai, Hunter W Drobenaire, Peter H Santschi, Antonietta Quigg, Wei-Chun Chin
Engineered nanoparticles (ENPs), products from modern nanotechnologies, can potentially impact the marine environment to pose serious threats to marine ecosystems. However, the cellular responses of marine phytoplankton to ENPs are still not well established. Here, we investigate four different diatom species (Odontella mobiliensis, Skeletonema grethae, Phaeodactylum tricornutum, Thalassiosira pseudonana) and one green algae (Dunaliella tertiolecta) for their extracellular polymeric substances (EPS) release under model ENP treatments: 25 nm titanium dioxide (TiO2), 10-20 nm silicon dioxide (SiO2), and 15-30 nm cerium dioxide (CeO2)...
December 13, 2017: Nanoscale Research Letters
S Rajeshkumar, Poonam Naik
A cerium oxide nanoparticles (nanoceria) has a wide range of applications in different fields, especially biomedical division. As a matter of concern, it has a major impact on the human health and environment. The aim of this review is to address the different ways of synthesis of nanoceria using chemical and green synthesis methods and characterization and the applications of nanoceria for antioxidant, anticancer, antibacterial activities and toxicological studies including the most recent studies carried out in vivo and in vitro to study the problems...
March 2018: Biotechnology Reports
Makoto Hirose, Nozomu Ishiguro, Kei Shimomura, Nicolas Burdet, Hirosuke Matsui, Mizuki Tada, Yukio Takahashi
The cerium density and valence in micrometer-size Pt/Ce2Zr2Ox (x=7-8) three-way catalyst particles were successfully mapped by hard X-ray spectro-ptychography (ptychographic-XAFS). The analysis of correlation between the Ce density and valence in ptychographic-XAFS images suggested the existence of several oxidation behaviors in the oxygen storage process in the Ce2Zr2Ox particles. Ptychographic-XAFS will open up the nanoscale chemical imaging and structural analysis of heterogeneous catalysts.
December 11, 2017: Angewandte Chemie
Ralph M Bolanz, Stefan Kiefer, Jörg Göttlicher, Ralph Steininger
Cerium is the most abundant rare earth element (REE) within the waste product of alumina production (red mud), but its speciation in this complex material is still barely understood. Previous studies showed evidence for a correlation between Ce and the main constituent of red mud, iron oxides, which led us to investigate the most abundant iron oxide in red mud, hematite, as possible carrier phase for Ce. Synthetic hematite can incorporate up to 1.70±0.01wt% Ce, which leads to a systematical increase of all unit cell parameters...
December 7, 2017: Science of the Total Environment
Stuti Bhagat, N V Srikanth Vallabani, Vaithiyalingam Shutthanandan, Mark Bowden, Ajay S Karakoti, Sanjay Singh
Catalytically active individual gold (Au) and cerium oxide (CeO2) nanoparticles (NPs) are well known to exhibit specific enzyme-like activities, such as natural catalase, oxidase, superoxide dismutase, and peroxidase enzymes. These activities have been maneuvered to design several biological applications such as immunoassays, glucose detection, radiation and free radical protection and tissue engineering. In biological systems, multienzyme complexes are involved in catalyzing important reactions of essential metabolic processes such as respiration, biomolecule synthesis, and photosynthesis...
December 7, 2017: Journal of Colloid and Interface Science
Seray Kaya, Mark Cresswell, Aldo R Boccaccini
Bioactive glasses (BGs) are being used in several biomedical applications, one of them being as antibacterial materials. BGs can be produced via melt-quenching technique or sol-gel method. Bactericidal silver-doped sol-gel derived mesoporous silica-based bioactive glasses were reported for the first time in 2000, having the composition 76SiO2-19CaO-2P2O5-3Ag2O (wt%) and a mean pore diameter of 28nm. This review paper discusses studies carried out exploring the potential antibacterial applications of drug-free mesoporous silica-based BGs...
February 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
Guoqiang Chen, Yunfei Xu
The fetal/life challenging Sepsis is an urgent medical disaster which have developed "blood poisoning". The sepsis is one of the disorders of organs which cause death in patients. The investigational models that mimicchemical change of sepsis in human bodywereessential. We have synthesized CeO2 NPs using eco-friendly method using plant extract. The characterization of synthesized CeO2 NPs was studied using UV-Vis, FTIR, XRD, SEM, EDX and TEM analysis. The results were confirmed that the synthesized CeO2 was in nano size with spherical shape...
February 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
Shaoyang Lin, Alireza K Ravari, Jie Zhu, Pavel Usov, Meng Cai, Spencer R Ahrenholtz, Yulia Pushkar, Amanda Morris
Investigation of chemical water oxidation was conducted on the [Ru(tpy)(dcbpy)OH2]2+ (tpy = 2,2':6',2''-terpyridine, dcbpy = 5,5'-dicarboxy-2,2'-bipyridine) -doped UiO-67 metal-organic framework (MOF). The MOF catalyst exhibited single site reaction pathway with similar kinetic behavior as the homogeneous Ru complex. The reaction was first order with respect to both the concentration of Ru catalyst and cerium ammonium nitrate (CAN), with kcat = 3 (±2) ×10-3 M-1s-1 in HNO3 (pH 0.5). The common degradation pathways of ligand dissociation and dimerization were precluded by MOF incorporation, leading to sustained catalysis and greater reusability as opposed to the molecular catalyst in homogeneous solution...
December 2, 2017: ChemSusChem
A Zimina, K Dardenne, M A Denecke, D E Doronkin, E Huttel, H Lichtenberg, S Mangold, T Pruessmann, J Rothe, Th Spangenberg, R Steininger, T Vitova, H Geckeis, J-D Grunwaldt
CAT-ACT-the hard X-ray beamline for CATalysis and ACTinide/radionuclide research at the KIT synchrotron radiation facility ANKA-is dedicated to X-ray spectroscopy, including "flux hungry" photon-in/photon-out and correlative techniques and combines state-of-the-art optics with a unique infrastructure for radionuclide and catalysis research. Measurements can be performed at photon energies varying between 3.4 keV and 55 keV, thus encompassing the actinide M- and L-edge or potassium K-edge up to the K-edges of the lanthanide series such as cerium...
November 2017: Review of Scientific Instruments
Francesco Giannici, Giovanna Canu, Alessandro Chiara, Marianna Gambino, Chiara Aliotta, Alessandro Longo, Vincenzo Buscaglia, Antonino Martorana
The chemical compatibility between electrolytes and electrodes is an extremely important aspect governing the overall impedance of solid-oxide cells. Since these devices work at elevated temperatures, they are especially prone to cation interdiffusion between the cell components, possibly resulting in secondary insulating phases. In this work, we applied X-ray microspectroscopy to study the interface between a samarium-doped ceria electrolyte and lanthanum ferrite cathodes (La0.9Sr0.1Fe0.85Cu0.15O3 - LSCF; La0...
December 1, 2017: ACS Applied Materials & Interfaces
Delia Teresa Sponza, Gökçe Güney
In this study, the degradations of 2,3,4,5,6-pentabromotoluene (PBT), 2,3,4,5,6-pentabromoethyl benzene (PBEB), triclosan (TCS) and gemfibrozil (GFZ) in raw hospital wastewater were investigated with cerium (IV) oxide and titanium (IV) oxide nanoparticles considering the mechanisms of adsorption, photolysis, and photocatalysis with UV-C lamps. The effects of nano-CeO2 and nano-TiO2 concentrations, irradiation times, UV light powers and hospital wastewater pH on the photodegradation yields of micropollutants namely PBT, PBEB, TCS and GFZ were investigated throughout photocatalysis...
November 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Eun-Jung Park, Sang Jin Lee, Gwang-Hee Lee, Dong-Wan Kim, Cheolho Yoon, Byoung-Seok Lee, Younghun Kim, Jaerak Chang, Kyuhong Lee
Nanoparticles (NPs) have recently emerged as an inhalable pollutant, owing to their applications, aluminum-based NPs (Al-NPs) have been prioritized for toxicity testing. In the current study, we compared the pulmonary biopersistence and subsequent toxicity of four different types of Al-NPs (two rod-type aluminum oxide NPs [AlONPs] with different aspect ratios [short (S)- and long (L)-AlONPs], spherical aluminum cerium oxide NPs [AlCeO3 , AlCeONPs] and spherical γ-aluminum oxide hydroxide nanoparticles [AlOOHNPs]) 13weeks after a single intratracheal instillation, considering the importance of their properties in their toxicity...
November 23, 2017: Journal of Applied Toxicology: JAT
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