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Agostina Grillone, Tianshu Li, Matteo Battaglini, Alice Scarpellini, Mirko Prato, Shinji Takeoka, Gianni Ciofani
Cerium oxide nanoparticles (nanoceria), well known for their pro- and antioxidant features, have been recently proposed for the treatment of several pathologies, including cancer and neurodegenerative diseases. However, interaction between nanoceria and biological molecules such as proteins and lipids, short blood circulation time, and the need of a targeted delivery to desired sites are some aspects that require strong attention for further progresses in the clinical application of these nanoparticles. The aim of this work is the encapsulation of nanoceria into a liposomal formulation in order to improve their therapeutic potentialities...
September 16, 2017: Nanomaterials
Josey E Topolski, Jared O Kafader, Caroline Chick Jarrold
The anion photoelectron (PE) spectra of a range of small mono-cerium molecular species, along with the Ce2O4(-) and Ce3O6(-) stoichiometric clusters, are presented and analyzed with the support of density functional theory calculations. A common attribute of all of the neutral species is that the Ce centers in both the molecules and clusters are in the +4 oxidation state. In bulk ceria (CeO2), an unoccupied, narrow 4f band lies between the conventional valence (predominantly O 2p) and conduction (Ce 5d) bands...
September 14, 2017: Journal of Chemical Physics
Reiner Anwander, Michael Dolg, Frank T Edelmann
This Tutorial Review provides an overview of the historic and current development of the organometallic chemistry of cerium in its oxidation state 4+. Among the tetravalent lanthanide ions, only Ce(4+) forms stable coordination compounds (e.g. (NH4)2[Ce(NO3)6]). Important fields of applications for cerium(iv) compounds include organic synthesis, bioinorganic chemistry, materials science, and industrial catalysis. In sharp contrast, organometallic cerium(iv) compounds are still exceedingly rare. The history of organocerium(iv) compounds is an exciting story of ups and downs...
September 15, 2017: Chemical Society Reviews
Greg Stortz, Jonathan D Thiessen, Daryl Bishop, Muhammad S Khan, Piotr Kozlowski, Fabrice Retière, Graham Schellenberg, Ehsan Shams, Xuezhu Zhang, Christopher J Thompson, Andrew Goertzen, Vesna Sossi
We present the characterization of a compact magnetic resonance (MR) compatible positron emission tomography (PET) insert for simultaneous pre-clinical PET/MR imaging. While specifically designed with the strict size constraint to fit inside the 114 mm inner diameter of the BGA-12S gradient coil used in the Bruker 70/20 and 94/20 series of small animal MR imaging (MRI) systems, the insert can be easily installed in any appropriate MRI scanner or used as a stand-alone PET system. Methods: The insert is made from a ring of 16 detector-blocks each made from depth-of-interaction capable dual-layer-offset arrays of cerium-doped lutetium-yttrium oxyorthosilicate crystals read out by silicon photomultiplier (SiPM) arrays...
September 14, 2017: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
Yi Xu, Chao Wang, Jun Hou, Peifang Wang, Lingzhan Miao, Guoxiang You, Bowen Lv, Yangyang Yang, Fei Zhang
The influences of cerium dioxide nanoparticles (CeO2 NPs) on nitrogen removal in biofilm were investigated. Prolonged exposure (75d) to 0.1mg/L CeO2 NPs caused no inhibitory effects on nitrogen removal, while continuous addition of 10mg/L CeO2 NPs decreased the treatment efficiency to 53%. With the progressive concentration of CeO2 NPs addition, the removal efficiency could nearly stabilize at 67% even with the continues spike of 10mg/L. The micro-profiles of dissolved oxygen, pH, and oxidation reduction potential suggested the developed protection mechanisms of microbes to progressive CeO2 NPs exposure led to the less influence of microenvironment, denitrification bacteria and enzyme activity than those with continuous ones...
September 1, 2017: Bioresource Technology
Chunmao Chen, Xin Yan, Brandon A Yoza, Tingting Zhou, Yang Li, Yali Zhan, Qinghong Wang, Qing X Li
Discharge of industrial wastewater causes water pollution. It is therefore necessary to treat wastewater prior to discharge. Catalytic ozonation processes (COP) using ZSM5 zeolites loaded with metallic (Ce, Fe, or Mn) oxides to remove nitrobenzene from water were investigated. The total organic carbon (TOC) removal by the COP treatment with NaZSM5-38, HZSM5-38, and NaZSM5-100 were increased by 6.7%, 23.1%, and 19.8%, respectively, in comparison with single ozonation efficiency (39.2%). The loadings of Ce, Fe, or Mn oxides increased the catalytic activity relative to ZSM5 zeolites alone...
September 8, 2017: Science of the Total Environment
Viktor Ivady, Adam Gali, Igor A Abrikosov
Hybrid functionals' non-local exchange-correlation potential contains a derivative discontinuity that improves on standard semi-local density functional theory (DFT) band gaps. Moreover, by careful parameterization, hybrid functionals can provide self-interaction reduced description of selected states. On the other hand, the uniform description of all the electronic states of a given system is a known drawback of these functionals that causes varying accuracy in the description of states with different degrees of localization...
September 11, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Devrah A Arndt, Emily K Oostveen, Judy Triplett, D Allan Butterfield, Olga V Tsyusko, Blanche E Collin, Daniel L Starnes, Jian Cai, Jon B Klein, Richard Nass, Jason M Unrine
This study examined the impact of surface functionalization and charge on ceria nanomaterial toxicity to Caenorhabditis elegans. The examined endpoints included mortality, reproduction, protein expression, and protein oxidation profiles. Caenorhabditis elegans were exposed to identical 2-5nm ceria nanomaterial cores which were coated with cationic (diethylaminoethyl dextran; DEAE), anionic (carboxymethyl dextran; CM), and non-ionic (dextran; DEX) polymers. Mortality and reproductive toxicity of DEAE-CeO2 was approximately an order of magnitude higher than for CM-CeO2 or DEX-CeO2...
September 6, 2017: Comparative Biochemistry and Physiology. Toxicology & Pharmacology: CBP
Mahdi Naseri-Nosar, Saeed Farzamfar, Hamed Sahrapeyma, Sadegh Ghorbani, Farshid Bastami, Ahmad Vaez, Majid Salehi
In the present study, cerium oxide (CeO2) nanoparticles were incorporated into poly (ε-caprolactone)/gelatin films in order to develop a potential wound dressing material. The wound dressings were prepared by electrospinning of poly (ε-caprolactone)/gelatin (1:1 (w/w)) solutions containing 1.50%, 3% and 6% (w/w) CeO2 nanoparticles. The electrospun films were evaluated regarding their morphology, contact angle, water-uptake capacity, water vapor transmission rate, tensile strength and cellular response. The film containing 1...
December 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
Einstein Mariya David Sugantharaj David, Madhav Madurantakam Royam, Suresh Kumar Rajamani Sekar, Bhuvaneshwari Manivannan, Swathy Jalaja Soman, Amitava Mukherjee, Chandrasekaran Natarajan
Although the toxicological impact of metal oxide nanoparticles has been studied for the last few decades on aquatic organisms, the exact mechanism of action is still unclear. The fate, behavior, and biological activity of nanoparticles are dependent on physicochemical factors like size, shape, surface area, and stability in the medium. This study deals with the effect of nano and bulk CeO2 particles on marine microcrustacean, Artemia salina. The primary size was found to be 15 ± 3.5 and 582 ± 50 nm for nano and bulk CeO2 (TEM), respectively...
September 8, 2017: Environmental Science and Pollution Research International
Shan-Shan Zhou, Shou-Qing Liu
Cocatalysts are vital for improving photocatalytic activity. Incorporating nitrogen atoms on a graphene frame using an imidazole cycle resulted in a new N-doped graphene (denoted as ING). Cerium(iv) oxide (CeO2) nanoparticles were dispersed on ING sheets, producing an ING/CeO2 hybrid material. The ING/CeO2 hybrid material was characterized using X-ray diffraction, transmission electron microscopy, Raman spectroscopy, ultraviolet-visible diffuse reflectance spectroscopy and surface photovoltage spectroscopy...
September 8, 2017: Photochemical & Photobiological Sciences
Irina Geibel, Marc Schmidtmann, Jens Christoffers
Densely functionalized, annulated dihydrofuran derivatives are prepared by a cerium-catalyzed aerobic oxidation reaction. The operationally simple transformation is environmentally and economically benign, since the precatalyst CeCl3·7H2O is non-toxic and inexpensive and the oxidant is simply dioxygen from air. Starting materials are β-oxoesters and silylenolethers, and the latter are derived from acetoacetate or acetylacetone. The reaction sequence is performed in one flask and consists of α-oxidation and Mukaiyama aldol reaction...
September 6, 2017: Organic & Biomolecular Chemistry
Ajay S Verma, Narendra M Suri, Suman Kant
Bauxite residue is the waste generated during alumina production by Bayer's process. The amount of bauxite residue (40-50 wt%) generated depends on the quality of bauxite ore used for the processing. High alkalinity and high caustic content in bauxite residue causes environmental risk for fertile soil and ground water contamination. The caustic (NaOH) content in bauxite residue leads to human health risks, like dermal problems and irritation to eyes. Moreover, disposal of bauxite residue requires a large area; such problems can only be minimised by utilising bauxite residue effectively...
September 1, 2017: Waste Management & Research
Yuzhen Huang, Li Li, Yan Zhang, Lina Zhang, Shenguang Ge, Hao Li, Jinghua Yu
In this report, a 3D microfluidic lab-on-paper device for ultrasensitive detection of lead cation was designed using phoenix tree fruit-shaped CeO2 nanoparticles (PFCeO2 NPs) as the catalyst and 50 nm silver NPs (Ag NPs) as the quencher. First, snowflake-like Ag NPs were grown on the paper working electrode through an in situ growth method and used as a matrix for DNAzymes that were specific for lead ions (Pb(2+)). After the addition of Ag NP-labeled substrate strands, the Ag NPs restrained the electrochemiluminescence (ECL) intensity of luminol greatly through the resonance energy transfer from luminol to Ag NPs...
September 15, 2017: ACS Applied Materials & Interfaces
Damian S Nakonieczny, Zbigniew K Paszenda, Marcin Basiaga, Tomasz Radko, Sabina Drewniak, Jacek Podwórny, Wojciech Bogacz
PURPOSE: High purity, fine crystalline, degradation-free at low temperature powders have attracted special interest in CAD/CAM prosthetic dentistry full ceramic restorations. This study reports the preparation and characterisation of zirconia-ceria (0.9 ZrO2 0.1 CeO2) powders. Materials were obtained from zirconium-n-alkoxide and cerium nitrate hexahydrate in the pH 2-4 and 8-10. METHODS: Zirconia- ceria powders were obtained with the sol-gel method in a humid-free environment...
2017: Acta of Bioengineering and Biomechanics
Matthäus Rothensteiner, Joel Jenni, Hermann Emerich, Alexander Bonk, Ulrich F Vogt, Jeroen A van Bokhoven
An in situ/operando flow cell for transmission mode X-ray absorption spectroscopy (XAS), X-ray diffraction (XRD), and combined XAS/XRD measurements in a single experiment under the extreme conditions of two-step solar thermochemical looping for the dissociation of water and/or carbon dioxide was developed. The apparatus exposes materials to relevant conditions of both the auto-reduction and the oxidation sub-steps of the thermochemical cycle at ambient temperature up to 1773 K and enables determination of the composition of the effluent gases by online quadrupole mass spectrometry...
August 2017: Review of Scientific Instruments
Chengwu Yang, Xiaojuan Yu, Philipp N Pleßow, Stefan Heissler, Peter Weidler, Alexei Nefedov, Felix Studt, Yuemin Wang, Christof Wöll
The photoreactivity of ceria, a photochemically inert, large band-gap oxide, can be increased to competitive values by introducing defects. We have investigated this previously unexplained phenomenon by monitoring UV-induced N2O decomposition on well-defined single crystals of this material using polarization-dependent infrared reflection-absorption spectroscopy (IRRAS). The IRRAS data, in conjunction with theory, provide direct evidence that reducing the ceria (110) surface yields high photoreactivity. On the (111) surface no such effects are seen...
August 31, 2017: Angewandte Chemie
Eudald Casals, Muriel F Gusta, Jordi Piella, Gregori Casals, Wladimiro Jiménez, Victor Puntes
We review the apparent discrepancies between studies that report anti-inflammatory effects of cerium oxide nanoparticles (CeO2 NPs) through their reactive oxygen species-chelating properties and immunological studies highlighting their toxicity. We observe that several underappreciated parameters, such as aggregation size and degree of impurity, are critical determinants that need to be carefully addressed to better understand the NP biological effects in order to unleash their potential clinical benefits. This is because NPs can evolve toward different states, depending on the environment where they have been dispersed and how they have been dispersed...
2017: Frontiers in Immunology
Sheida Yousefi Mobasherat Jajroud, Mojtaba Falahati, Farnoosh Attar, Ramazan Ali Khavari-Nejad
The nanoparticle (NP)-induced conformational changes of protein and NP agglomeration have gained a remarkable interest in medical and biotechnological area. Herein, the effect of human hemoglobin (Hb) on the colloidal stability of cerium oxide NP (CNP) was investigated by dynamic light scattering (DLS), zeta potential, and TEM analysis. In addition, the effect of CNP on the heme degradation and structural changes of Hb was studied using fluorescence, circular dichroism (CD), and UV-visible (UV-vis) spectroscopic methods...
August 28, 2017: Journal of Biomolecular Structure & Dynamics
Eun-Jung Park, Gwang-Hee Lee, Cheolho Yoon, Uiseok Jeong, Younghun Kim, Jaerak Chang, Dong-Wan Kim
The tissue distribution and toxicity of nanoparticles (NPs) depend on their physical and chemical properties both in the manufactured condition and within the biological system. We characterized three types of commercially available aluminum-based NPs (Al-NPs), two rod-type aluminum oxide NPs (Al2 O3 , AlONPs), with different aspect ratios (short [S]- and long [L]-AlONPs), and spherical aluminum cerium oxide NPs (AlCeO3 , AlCeONPs). The surface area was in order of the S-AlONPs > L-AlONPs > AlCeONPs. Very importantly, we found that AlCeONPs is Al2 O3 -coated CeO2 NPs, but not AlCeO3 NPs, and that the Al level in AlCeONPs is approximately 20% of those in S- and L-AlONPs...
August 24, 2017: Journal of Applied Toxicology: JAT
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