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Jony Saha, T P Radhakrishnan
Design of electrocatalysts for the fundamentally important oxygen evolution reaction can be greatly aided by systematic structure-activity tuning via composition variation. We have explored the iron-cerium system as they are the most abundant transition and rare earth metals, and also due to the mutualistic impact of their size and electronic attributes that can induce critical changes in the structure and electrochemical activity. Submicrometer thick films of a series of Fe(III)-Ce(III) phosphate(oxyhydroxide) (FeCePH) are fabricated using a soft chemical strategy involving surfactant-aided assembly, spin-coating, and mild thermal annealing...
August 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Hyungseob Lim, Jae Young Kim, Edward J Evans, Amritesh Rai, Jun-Hyuk Kim, Bryan R Wygant, Charles Buddie Mullins
There has been debate on whether Ni(OH)2 is truly catalytically active for the photo/-electrocatalytic oxygen evolution reaction. In this report, we have synthesized a Ni(OH)2 co-catalyst on a hematite photoanode and showed that, as has been proposed in other studies, the current density varies as a function of scan rate, which arise due to a photo-induced capacitive charging effect. We have discovered that this photo-induced charging of Ni2+/3+ can be overcome by mixing cerium nitrate into the Ni precursor solution...
August 16, 2017: ACS Applied Materials & Interfaces
Alexander V Zabula, Yusen Qiao, Alex J Kosanovich, Thibault Cheisson, Brian C Manor, Patrick J Carroll, Oleg V Ozerov, Eric J Schelter
Synthetic methods for the coordination of the monoanionic bis[2-(diisopropylphosphino)-4-methylphenyl]amido (PNP) ligand framework to the cerium(III) cation have been developed and applied for the isolation of a series of {(PNP)Ce} and {(PNP)2Ce} type complexes. The structures of the complexes were studied by X-ray diffraction and multinuclear NMR spectroscopy. We found that the cerium(III) ion can induce the elimination of one of the iPr groups at phosphorus to yield a new dianionic PNP tridentate framework (PNP-iPr) featuring a phosphido-donor functionality, which is bound to the cerium ion with the shortest known Ce-P bond of 2...
August 10, 2017: Chemistry: a European Journal
Martina Palomino-Schätzlein, Hermenegildo García, Patricia Gutiérrez-Carcedo, Antonio Pineda-Lucena, José Raul Herance
Human peripheral blood cells are relevant ex vivo models for characterizing diseases and evaluating the pharmacological effects of therapeutic interventions, as they provide a close reflection of an individual pathophysiological state. In this work, a new approach to evaluate the impact of nanoparticles on the three main fractions of human peripheral blood cells by nuclear magnetic resonance spectroscopy is shown. Thus, a comprehensive protocol has been set-up including the separation of blood cells, their in vitro treatment with nanoparticles and the extraction and characterization of metabolites by nuclear magnetic resonance...
2017: PloS One
Milad Jourshabani, Zahra Shariatinia, Alireza Badiei
Porous CeO2/sulfur-doped g-C3N4 (CeO2/CNS) composites were synthesized by one-pot thermal condensation of thiourea and cerium nitrate as starting materials. The obtained CeO2(x)/CNS composites (x=8.4, 9.5 and 10.4wt%) with different CeO2 contents were characterized by the XRD, FT-IR, XPS, TEM, BET, DRS and PL analyses. The TEM images displayed a nonporous and platelet-like morphology for pure CNS but a nanoporous structure with numerous uniform pore sizes of ∼40nm for the CeO2(9.5)/CNS composite. The XRD phase structures and TEM morphologies confirmed that structural evolution trend and stacking degree of CNS were disrupted in precense of the CeO2 nanoparticles...
July 29, 2017: Journal of Colloid and Interface Science
Clément Layet, Melanie Auffan, Catherine Santaella, Claire Chevassus-Rosset, Mélanie Montes, Philippe Ortet, Mohamed Barakat, Blanche Collin, Samuel Legros, Matthieu Nicolas Bravin, Bernard Angeletti, Isabelle Kieffer, Olivier Proux, Jean-Louis Hazemann, Emmanuel Doelsch
The ISO-standardized RHIZOtest is used here for the first time to decipher how plant species, soil properties, physical-chemical properties of the nanoparticles and their transformation regulate the phytoavailability of nanoparticles. Two plants, tomato and fescue, were exposed to two soils with contrasted properties: a sandy soil poor in organic matter and a clay soil rich in organic matter, both contaminated with 1, 15, and 50 of dissolved Ce2(SO4)3, bare and citrate-coated CeO2 nanoparticles. All the results demonstrate that two antagonistic soil properties controlled Ce uptake...
August 4, 2017: Environmental Science & Technology
Alberto Figueroba, Albert Bruix, Gábor Kovács, Konstantin M Neyman
Doping oxide materials by inserting atoms of a different element in their lattices is a common procedure for modifying properties of the host oxide. Using catalytically active, yet expensive noble metals as dopants allows synthesizing materials with atomically dispersed metal atoms, which can become cost-efficient catalysts. The stability and chemical properties of the resulting materials depend on the structure of the host oxide and on the position of the dopant atoms in it. In the present work we analyze by means of density functional calculations the relative stability and redox properties of cerium dioxide (ceria) nanoparticles doped with atoms of four technologically relevant transition metals - Pt, Pd, Ni and Cu...
August 16, 2017: Physical Chemistry Chemical Physics: PCCP
Liza L Ramenzoni, Franz E Weber, Thomas Attin, Patrick R Schmidlin
This study investigated the effect of cerium chloride (CeCl₃) on cell migration and gene expression of human foreskin fibroblasts (HFF). HFF were exposed to three different CeCl₃ solutions (1%, 5% and 10%, w/v %) for three different time durations (1, 5 and 10 min). 72 h after exposure to CeCl₃, cell viability was assessed by MTT test. A scratch-wounded assay determined the cell migration and the width of the wound, measured at 24 h. Gene expression patterns for cyclins B1, D1 and E1 were analyzed by RT-PCR (p < 0...
May 24, 2017: Materials
Zi-Kui Liu, Shun-Li Shang, Yi Wang
Thermal expansion is an important property of substances. Its theoretical prediction has been challenging, particularly in cases the volume decreases with temperature, i.e., thermal contraction or negative thermal expansion at high temperatures. In this paper, a new theory recently developed by the authors has been reviewed and further examined in the framework of fundamental thermodynamics and statistical mechanics. Its applications to cerium with colossal thermal expansion and Fe₃Pt with thermal contraction in certain temperature ranges are discussed...
April 14, 2017: Materials
Ismail A M Ibrahim
Cerium intermetallic compounds exhibit anomalous physical properties such as heavy fermion and Kondo behaviors. Here, an ab initio study of the electronic structure, magnetic properties, and mixed valence character of Ce2 Ni3 Si5 using density functional theory (DFT) is presented. Two theoretical methods, including pure Perdew-Burke-Ernzerhof (PBE) and PBE + U, are used. In this study, Ce(3+) and Ce(4+) are considered as two different constituents in the unit cell. The formation energy calculations on the DFT level propose that Ce is in a stable mixed valence of 3...
August 2, 2017: Journal of Computational Chemistry
Fern Sinclair, Johann A Hlina, Jordann A L Wells, Michael P Shaver, Polly L Arnold
The C3-symmetric uranium(iv) and cerium(iv) complexes Me3SiOM(OAr(P))3, M = U (1), Ce (2), OAr(P) = OC6H2-6-(t)Bu-4-Me-2-PPh2, have been prepared and the difference between these 4f and 5f congeners as initiators for the ring opening polymerisation (ROP) of l-lactide is compared. The poorly controlled reactivity of the homoleptic analogue U(OAr(P))4 (3) demonstrates the importance of the M-OSiMe3 initiating group. The incorporation of a nickel atom in 1 to form the U-Ni heterobimetallic complex Me3SiOU(OAr(P))3Ni (4) may be the first example of the use of the inverse trans influence to switch the reactivity of a complex...
August 2, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Yongjian Li, Panpan Guan, Fucheng Yu, Wei Li, Xiaoling Xie
The electrode based on cerium oxide (CeO₂) nanorods embedded in nickel hydroxide (Ni(OH)₂) matrix were prepared and used for detecting glucose non-enzymatically. The materials were characterized by X-ray diffraction, transmission electron microscopy (TEM), and so on. The results indicate that the response of CeO₂/Ni(OH)₂ nanocomposite are significantly improved due to the synergetic effect between CeO₂ and Ni(OH)₂. The optimum CeO₂/Ni(OH)₂ nanocomposite electrode exhibits a detection range from 2 μM to 6...
July 31, 2017: Nanomaterials
Hakan Kaygusuz, Emrah Torlak, Gülşen Akın-Evingür, İlhan Özen, Regine von Klitzing, F Bedia Erim
Wound dressings require good antiseptic properties, mechanical strength and, more trustably, natural material ingredients. Antimicrobial properties of cerium ions and chitosan are known and alginate based wound dressings are commercially available. In this study, the advantages of these materials were combined and alginate films were crosslinked with cerium(III) solution and chitosan added cerium(III) solution. Films were characterized by Fourier transform infrared spectroscopy (FTIR), light transmittance, scanning electron microscopy (SEM), swelling experiments, water vapor transmittance tests, and mechanical stretching tests...
July 24, 2017: International Journal of Biological Macromolecules
Nandini D P K Manne, Ravikumar Arvapalli, Vincent A Graffeo, Venkata V K Bandarupalli, Tolou Shokuhfar, Sweetu Patel, Kevin M Rice, Gautam Kumar Ginjupalli, Eric R Blough
BACKGROUND: Hepatic ischemia reperfusion is one the main causes for graft failure following transplantation. Although, the molecular events that lead to hepatic failure following ischemia reperfusion (IR) are diverse and complex, previous studies have shown that excessive formation of reactive oxygen species (ROS) are responsible for hepatic IR injury. Cerium oxide (CeO2) nanoparticles have been previously shown to act as an anti-oxidant and anti-inflammatory agent. Here, we evaluated the protective effects of CeO2 nanoparticles on hepatic ischemia reperfusion injury...
July 27, 2017: Cellular Physiology and Biochemistry
Junjie Zhang, Haibing Zheng, Maobing Shuai, Yao Li, Yang Yang, Tao Sun
The coupling between structural phase transformations and dislocations induces challenges in understanding the deformation behavior of metallic cerium at the nanoscale. In the present work, we elucidate the underlying mechanism of cerium under ultra-precision diamond cutting by means of molecular dynamics modeling and simulations. The molecular dynamics model of diamond cutting of cerium is established by assigning empirical potentials to describe atomic interactions and evaluating properties of two face-centered cubic cerium phases...
December 2017: Nanoscale Research Letters
Ali Es-Haghi, Mohammad Mashreghi, Mahere Rezazade Bazaz, Masoud Homayouni-Tabrizi, Majid Darroudi
The aim of this study is to introduce natural-based polymers, chitosan and starch, to design a remedial nanocomposite, comprising of cerium oxide nanoparticles and silver nanoparticles, to investigate their effects in accelerating wound healing and in wound microbial load. Cerium oxide nanoparticles synthesized in starch solution added to the colloidal dispersion of synthesized silver nanoparticles in chitosan to make a three-component nanomaterial. Mice were anaesthetized and two parallel full-thickness round wounds were excised under aseptic conditions with the help of sterile dermal biopsy punch...
August 2017: IET Nanobiotechnology
Susan Dekkers, Mark R Miller, Roel P F Schins, Isabella Römer, Mike Russ, Rob J Vandebriel, Iseult Lynch, Marie-France Belinga-Desaunay, Eugenia Valsami-Jones, Shea P Connell, Ian P Smith, Rodger Duffin, John A F Boere, Harm J Heusinkveld, Catrin Albrecht, Wim H de Jong, Flemming R Cassee
Development and manufacture of nanomaterials is growing at an exponential rate, despite an incomplete understanding of how their physicochemical characteristics affect their potential toxicity. Redox activity has been suggested to be an important physicochemical property of nanomaterials to predict their biological activity. This study assessed the influence of redox activity by modification of cerium dioxide nanoparticles (CeO2 NPs) via zirconium (Zr) doping on the biodistribution, pulmonary and cardiovascular effects in mice following inhalation...
August 9, 2017: Nanotoxicology
Lihong Wang, Jingfang He, Qing Yang, Xiaofen Lv, Jigang Li, David D Y Chen, Xiaolan Ding, Xiaohua Huang, Qing Zhou
The environmental safety of cerium (Ce) applications in many fields has been debated for almost a century because the cellular effects of environmental Ce on living organisms remain largely unclear. Here, using new, interdisciplinary methods, we surprisingly found that after Ce(III) treatment, Ce(III) was first recognized and anchored on the plasma membrane in leaf cells. Moreover, some trivalent Ce(III) was oxidized to tetravalent Ce(IV) in this organelle, which activated pinocytosis. Subsequently, more anchoring sites and stronger valence-variable behavior on the plasma membrane caused stronger pinocytosis to transport Ce(III and IV) into the leaf cells...
July 21, 2017: Environmental Pollution
Yanfang Feng, Haiying Lu, Yang Liu, Lihong Xue, Dionysios D Dionysiou, Linzhang Yang, Baoshan Xing
In this study, nano-cerium oxide functionalized maize straw biochar (Ce-MSB) was prepared and utilized to remove P from agricultural wastewater. Response Surface Model was applied to optimize the operating conditions. Moreover, Ce-MSB was applied to actual rice paddy column for the first time. Response Surface Model (RSM) showed higher materials ratio had positive effect on PO4(3-) adsorption capacity, while higher pyrolysis temperature had negative effect. The maximum adsorption capacity of Ce-MSB for PO4(3-) was 78 mg g(-1), implying that Ce-MSB was an effective functionalized adsorbent for P removal...
October 2017: Chemosphere
Adeeb H Rahman, Yonit Lavin, Soma Kobayashi, Andrew Leader, Miriam Merad
BACKGROUND: Mass cytometry leverages inductively coupled mass spectrometry to perform high dimensional single cell analyses using antibodies tagged with rare earth isotopes that are considered to be largely absent in biological samples. We have recently noted an unusual exception to this rule while analyzing tissue samples from patients undergoing surgical resection for early stage lung cancer, and here we present a detailed cytometric characterization of cerium in a clinical patient sample...
July 22, 2017: Cytometry. Part B, Clinical Cytometry
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