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Cerium

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https://www.readbyqxmd.com/read/28091999/porous-nano-cerium-oxide-wood-chip-biochar-composites-for-aqueous-levofloxacin-removal-and-sorption-mechanism-insights
#1
Shengze Yi, Yuanyuan Sun, Xin Hu, Hongxia Xu, Bin Gao, Jichun Wu
The adsorption removal of levofloxacin (LEV), a widely used fluoroquinolone antibiotic, by using the biochars derived from the pyrolysis of pine wood chip pretreated with cerium trichloride was investigated through batch sorption experiments and multiple characterization techniques. The differences in the basic physicochemical properties between Ce-impregnated biochars and the pristine biochars were confirmed by the analysis of elemental compositions, specific surface areas, energy dispersive spectrometry, X-ray diffraction, and thermo-gravimetry...
January 14, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28091923/experimental-study-of-the-effects-of-nanodispersed-ceria-on-wound-repair
#2
O A Legon'kova, T A Ushakova, I P Savchenkova, N V Perova, M S Belova, A A Torkova, A E Baranchikov, O S Ivanova, A I Korotaeva, V K Ivanov
We studied the effects of nanodispersed ceria on wound healing in vitro and in vivo. It was found that cerium dioxide stimulated wound healing, which manifested in shrinkage of burn wound area (by 1.5 times) and intensification (by 2.4 times) marginal epithelialization.
January 14, 2017: Bulletin of Experimental Biology and Medicine
https://www.readbyqxmd.com/read/28076948/cerium-iv-imido-complexes-structural-experimental-and-reactivity-studies
#3
Lukman A Solola, Alexander V Zabula, Walter L Dorfner, Brian C Manor, Patrick J Carroll, Eric J Schelter
A series of alkali metal capped cerium(IV) imido complexes, [M(solv)x][Ce=N(3,5-(CF3)2C6H3)(TriNOx)] (M = Li, K, Rb, Cs; solv = TMEDA, THF, Et2O or DME), was isolated and fully characterized. An X-ray structural investigation of the cerium imido complexes demonstrated the impact of the alkali metal counterions on the geometry of the [Ce=N(3,5-(CF3)2C6H3)(TriNOx)]- moiety. Substantial shortening of the Ce=N bond was observed with increasing size of the alkali metal cation. The first complex featuring an unsupported, terminal multiple bond between a Ce(IV) ion and a ligand fragment was also isolated by encapsulation of a Cs+ counterion with 2...
January 11, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28074974/ligand-assisted-mechanochemical-synthesis-of-ceria-based-catalysts-for-the-selective-catalytic-reduction-of-no-by-nh3
#4
J F Yan, W G Qiu, L Y Song, Y Chen, Y C Su, G M Bai, G Z Zhang, H He
CeO2/TiO2 catalysts were fabricated by dry ball milling in the presence or absence of an organic ligand. It was found that the catalysts prepared by ligand-assisted ball milling exhibited high NH3-SCR activities due to the interaction between cerium ions and ligand molecules resulting in good dispersion, a high Ce(3+) ratio and high reducibility of cerium species.
January 11, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28046538/tu-h-campus-tep2-05-selective-protection-of-normal-tissue-by-cerium-oxide-nanoparticles-during-radiation-therapy
#5
Z Ouyang, S Yasmin-Karim, G Strack, E Sajo, W Ngwa
PURPOSE: Cerium oxide nanoparticles (CONPs) have unique pH dependent properties such that they act as a radical modulator. These properties may be used in radiation therapy (RT) to protect normal tissue. This work investigates the selective radioprotection of CONPs in-vitro and potential for in-situ delivery of CONPs in prostate cancer RT. METHODS: i) Normal human umbilical vein endothelial cells (HUVEC) and human prostate cancer cells (PC-3) were treated with 0 or 2 ng/mL CONPs (NP size: 5 nm)...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28045152/water-gas-shift-reaction-on-reduced-gold-substituted-ce1-xo2-111-surfaces-the-role-of-au-charge
#6
Ming-Wen Chang, Wen-Shyan Sheu
Density functional theory is employed to investigate the role of Au charge in the water-gas-shift (WGS) reaction on a CeO2(111) surface with a cerium atom replaced by a gold atom. The oxidation state of the gold atom, varied between +3 and -1, is controlled by altering the number and configuration of oxygen vacancies. The findings indicate that Au(3+) and Au(-) are not catalytically active for the WGS reaction because of a high energy barrier of +1.54 eV required to dissociate water and +1.40 eV to produce H2 and CO2, respectively...
January 18, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28040976/composition-tuning-in-a-solid-state-electrotransport-furnace-with-active-thermal-expansion-compensation
#7
J L Schmehr, W Whitley, A D Huxley
A new solid-state electrotransport (SSE) apparatus for refining ultra-pure single crystals of metallic compounds under ultra-high vacuum is described. The setup employs a novel thermal expansion compensation mechanism to minimize mechanical stress on the sample during refinement with cold clamps for contamination-less purification at elevated temperatures. The apparatus is designed to tune the composition of initially slightly off-stoichiometric samples. The expansion compensation and stress-free operation were tested by recording the thermal expansion of elemental cerium in a treatment up to 655 °C...
December 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28040403/effects-of-cerium-oxide-nanoparticles-on-the-species-and-distribution-of-phosphorus-in-enhanced-phosphorus-removal-sequencing-batch-biofilm-reactor
#8
Yi Xu, Chao Wang, Jun Hou, Peifang Wang, Guoxiang You, Lingzhan Miao, Bowen Lv, Yangyang Yang
The short term (8h) influences of cerium oxide nanoparticles (CeO2NPs) on the process of phosphorus removal in biofilm were investigated. At concentration of 0.1mg/L, CeO2 NPs posed no impacts on total phosphorus (TP) removal. While at 20mg/L, TP removal efficiency reduced from 85.16% to 59.62%. Results of P distribution analysis and (31)P nuclear magnetic resonance spectroscopy implied that the anaerobic degradation of polyphosphate (polyP) and the release of orthophosphate in extracellular polymeric substances (EPS) were inhibited...
March 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28040360/partial-thickness-scalds-in-children-a-comparison-of-different-treatment-strategies
#9
E de Graaf, M E van Baar, M G A Baartmans, S M H J Scholten-Jaegers, M K Nieuwenhuis, J Eshuis, J Hiddingh, G I J M Beerthuizen, C H van der Vlies
AIM: The aim of this study was to compare the clinical outcomes of different treatment strategies for children with partial-thickness scalds at two burn centers. At the first burn center, these burns were treated with a hydrofiber dressing (Aquacel(®), Convatec, Inc.(®), Princeton, NJ, USA) or silver sulfadiazine (SSD, Flammazine(®), Sinclair IS Pharma, London, UK Pharmaceuticals), while at the second burn center, cerium nitrate-silver sulfadiazine (CN-SSD, Flammacerium(®), Sinclair IS Pharma, London, UK Pharmaceuticals) was used...
December 28, 2016: Burns: Journal of the International Society for Burn Injuries
https://www.readbyqxmd.com/read/28033000/structure-and-bonding-investigation-of-plutonium-peroxocarbonate-complexes-using-cerium-surrogates-and-electronic-structure-modeling
#10
Lucas E Sweet, Jordan F Corbey, Frédéric Gendron, Jochen Autschbach, Bruce K McNamara, Kate L Ziegelgruber, Leah M Arrigo, Shane M Peper, Jon M Schwantes
Herein, we report the synthesis and structural characterization of K8[(CO3)3Pu]2(μ-η(2)-η(2)-O2)2·12H2O. This is the second Pu-containing addition to the previously studied alkali-metal peroxocarbonate series M8[(CO3)3A]2(μ-η(2)-η(2)-O2)2·xH2O (M = alkali metal; A = Ce or Pu; x = 8, 10, 12, or 18), for which only the M = Na analogue has been previously reported when A = Pu. The previously reported crystal structure for Na8[(CO3)3Pu]2(μ-η(2)-η(2)-O2)2·12H2O is not isomorphous with its known Ce analogue...
December 29, 2016: Inorganic Chemistry
https://www.readbyqxmd.com/read/28032280/fluorescent-nanocomposite-of-embedded-ceria-nanoparticles-in-electrospun-chitosan-nanofibers
#11
Nader Shehata, Effat Samir, Soha Gaballah, Aya Hamed, Marwa Saad, Mohammed Salah
This paper introduces a detailed optical characterization for a novel fluorescent biodegradable nanocomposite of electro-spun chitosan nanofibers with in-situ embedded cerium oxide (ceria) nanoparticles as the nanocomposite optical fluorescent material. Under near ultra-violet excitation, this synthesized nanocomposite emits a visible green wavelength at nearly 520nmwith different intensities according to the concentration of the embedded fluorescent material; i.e. ceria nanoparticles. This emission is due to the synthesized ceria nanoparticles optical tri-valiant cerium ions ce(3+), associated with formed oxygen vacancies with a direct allowed bandgap around 3...
December 28, 2016: Journal of Fluorescence
https://www.readbyqxmd.com/read/28004094/chemiluminescence-determination-of-local-anaesthetic-mepivacaine-in-human-plasma-and-pharmaceuticals
#12
Ali Mokhtari
In this study, a new method has been developed for the simple determination of mepivacaine (carbocaine). The method is based on the enhancement effect of mepivacaine in the chemiluminescence (CL) reaction of tris(1,10 phenanthroline) ruthenium(II) with cerium(IV). A mechanism for the CL reaction has been proposed on the basis of UV-Vis, fluorescent and CL spectra. Under optimum conditions, the CL intensity was proportional to the concentration of the drug in solution over the range 0.45-226.25 μg mL-1 (R2 = 0...
December 2016: Acta Chimica Slovenica
https://www.readbyqxmd.com/read/28000542/cerium-oxide-nanoparticles-the-regenerative-redox-machine-in-bioenergetic-imbalance
#13
Ilaria Pezzini, Attilio Marino, Serena Del Turco, Claudia Nesti, Stefano Doccini, Valentina Cappello, Mauro Gemmi, Paola Parlanti, Filippo M Santorelli, Virgilio Mattoli, Gianni Ciofani
AIM: Owing to their catalytic properties as reactive oxygen species scavengers, cerium oxide nanoparticles (nanoceria) have become an extremely promising candidate for medical applications, especially in the treatment of diseases where oxidative stress has been proposed as one of the main pathogenesis factors. MATERIALS & METHODS: In this work, nanoceria antioxidant power has been tested in primary cultured skin fibroblasts, derived from healthy individuals, by evaluating the mitochondrial function both in basal condition and after an oxidative insult...
December 21, 2016: Nanomedicine
https://www.readbyqxmd.com/read/27999946/biokinetic-measurements-and-modelling-of-urinary-excretion-of-cerium-citrate-in-humans
#14
Vera Höllriegl, Wei Bo Li, Bernhard Michalke
Tracer kinetics in healthy human volunteers was studied applying stable isotopes of cerium citrate to obtain biokinetic human data for the urinary excretion of cerium. These data were then used to compare and validate the biokinetic model for lanthanides (cerium) proposed by Taylor and Leggett (Radiat Prot Dosim 105:193-198, 2003), which is substantially improved and more realistic than the biokinetic model currently recommended by the International Commission on Radiological Protection (ICRP Publication 67, 1993); both models are primarily based on animal data...
December 20, 2016: Radiation and Environmental Biophysics
https://www.readbyqxmd.com/read/27989172/density-functional-theory-as-a-predictive-tool-for-cerium-redox-properties-in-nonaqueous-solvents
#15
Jessica R Levin, Walter L Dorfner, Alan X Dai, Patrick J Carroll, Eric J Schelter
Two methods to correlate and predict experimental redox potentials for cerium complexes were evaluated. Seventeen previously reported cerium complexes were computed using DFT methods in both the Ce(III) and Ce(IV) oxidation states with a dichloromethane solvent continuum. In the first computational approach, the ΔG(o)(Ce(IV)/Ce(III)) was determined for each of the compounds and these values were correlated with the experimental E1/2 values measured in dichloromethane, referenced to the ferrocene/ferrocenium couple...
December 19, 2016: Inorganic Chemistry
https://www.readbyqxmd.com/read/27987304/identification-of-lanthanum-specific-peptides-for-future-recycling-of-rare-earth-elements-from-compact-fluorescent-lamps
#16
Franziska L Lederer, Susan B Curtis, Stefanie Bachmann, W Scott Dunbar, Ross T A MacGillivray
As components of electronic scrap, rare earth minerals are an interesting but little used source of raw materials that are highly important for the recycling industry. Currently, there exists no cost-efficient technology to separate rare earth minerals from an electronic scrap mixture. In this study, phage surface display has been used as a key method to develop peptides with high specificity for particular inorganic targets in electronic scrap. Lanthanum phosphate doped with cerium and terbium as part of the fluorescent phosphors of spent compact fluorescent lamps (CFL) was used as a target material of economic interest to test the suitability of the phage display method to the separation of rare earth minerals...
December 17, 2016: Biotechnology and Bioengineering
https://www.readbyqxmd.com/read/27975093/biomimetic-synthesis-of-cerium-oxide-nanosquares-on-rgo-and-their-enhanced-photocatalytic-activities
#17
Junchao Qian, Yunyue Cao, Zhigang Chen, Chengbao Liu, Xiaowang Lu
Water splitting based on heterogeneous photocatalytic nanomaterials is an attractive approach for generating hydrogen as a clean chemical fuel from solar energy. However, the high defect-induced recombination rate of photoexcited electron-hole pairs and poor photostability have greatly limited the heterophotocatalysts' practical application. Herein, we used a biotemplate method to give reduced graphene oxide (RGO) a remarkable unique bio-porous morphology with significant anti-aggregation of CeO2 square quantum dots (SQDs) when growing them in situ during a simple hydrothermal process...
January 3, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/27951703/modeling-the-hydrophobicity-of-nanoparticles-and-their-interaction-with-lipids-and-proteins
#18
Ali Ramazani, Taraknath Mandal, Ronald G Larson
We present a method of modeling nanoparticle (NP) hydrophobicity using coarse-grained molecular dynamics (CG MD) simulations, and apply this to the interaction of lipids with nanoparticles. To model at a coarse-grained level the wettability or hydrophobicity of a given material, we choose the MARTINI coarse-grained force field, and determine through simulation the contact angles of MARTINI water droplets residing on flat regular surfaces composed of various MARTINI bead types (C1, C2, etc.). Each surface is composed of a single bead type in each of three crystallographic symmetries (FCC, BCC, and HCP)...
December 13, 2016: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/27951699/crystallization-at-nanodroplet-interfaces-in-emulsion-systems-a-soft-template-strategy-for-preparing-porous-and-hollow-nanoparticles
#19
H Samet Varol, Olaia Álvarez-Bermúdez, Paolo Dolcet, Balati Kuerbanjiang, Silvia Gross, Katharina Landfester, Rafael Muñoz-Espí
A heterophase method to prepare hollow and/or porous crystalline nanoparticles of metal oxides at room temperature is presented, taking cerium(IV) oxide and γ-iron(III) oxide (i.e., maghemite) as representative cases. The crystallization begins at the oil-water interface in aqueous nanodroplets of the precursor in inverse (water-in-oil) miniemulsion systems, and it may continue toward the inner part of the droplets. A poly(styrene-b-acrylic acid) block copolymer is used as a structuring agent because the ability of the carboxylic groups to bind metal ions improves the inorganic shell formation...
December 13, 2016: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/27941942/construction-of-a-triple-stimuli-responsive-system-based-on-cerium-oxide-coated-mesoporous-silica-nanoparticles
#20
Jia Wen, Kui Yang, Yongqian Xu, Hongjuan Li, Fengyu Liu, Shiguo Sun
In this work, a triple-stimuli (GSH, pH and light irradiation) responsive system were designed based on CeO2 nanoparticles (CeO2 NPs) coated doxorubicin (DOX) and photosensitizer hematoporphyrin (HP) dual-loaded mesoporous silica nanoparticles (MSN). Upon entering into cancer cells, both high concentration of intracellular GSH and low pH environment would reduce CeO2 NPs to cerium ions, accompanied with the degradation of CeO2 NPs and the conformational change of HP under light irradiation, the preloaded DOX are thus released from the nanocarrier, resulting in a contrast fluorescence enhancement...
December 12, 2016: Scientific Reports
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