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Shahanavaj Khan, Anees A Ansari, Christian Rolfo, Andreia Coelho, Maha Abdulla, Khayal Al-Khayal, Rehan Ahmad
Cerium oxide nanocrystals (CeO2-NCs) exhibit superoxide dismutase and catalase mimetic activities. Based on these catalytic activities, CeO2-NCs have been suggested to have the potential to treat various diseases. The crystalline size of these materials is an important factor that influences the performance of CeO2-NCs. Previous reports have shown that several metal-based nanocrystals, including CeO2-NCs, can induce cytotoxicity in cancer cells. However, the underlying mechanisms have remained unclear. To characterize the anticancer activities of CeO2-NCs, several assays related to the mechanism of cytotoxicity and induction of apoptosis has been performed...
2017: Science and Technology of Advanced Materials
Wei Xia, Jun Zhao, Tao Wang, Li Song, Hao Gong, Hu Guo, Bing Gao, Xiaoli Fan, Jianping He
Polymer networks such as those of epoxy resin, as common protection materials, possess radiolytic oxidation degradation effects under gamma irradiation environment, which have a great accelerating effect on the ageing rate and severely limit their potential applications for metal protection in the nuclear industry. To overcome this, we report a simple scheme of anchoring crystalline ceria nanoparticles onto graphene sheets (CG) and incorporate it into the epoxy resin, followed by thermal polymerization to obtain CeO2/graphene-epoxy nanocomposite coating (CGNS)...
June 19, 2017: Physical Chemistry Chemical Physics: PCCP
Kai Li, Qingyi Shen, Youtao Xie, Mingyu You, Liping Huang, Xuebin Zheng
Oxidative stress exerts a key influence in osteoporosis in part by inhibiting osteogenic differentiation of bone marrow stromal cells (BMSCs). With their unique antioxidant properties and reported biocompatibility, cerium oxide (CeO2) ceramics exhibit promising potential for the treatment of osteoporosis resulting from oxidative stress. In this study, protective effects of CeO2-incorporated hydroxyapatite coatings (HA-10Ce and HA-30Ce) on the viability and osteogenic differentiation of H2O2-treated BMSCs were examined...
June 17, 2017: Biological Trace Element Research
Jing Ouyang, Zai Zhao, Yi Zhang, Huaming Yang
Halloysite (Hal) hybridized ceria-zirconia solid solution material (CZ-Hal) for three way catalysis was synthesized through co-precipitation method. X-ray diffraction (XRD), N2 adsorption-desorption isotherms, transmission electronic microscopy (TEM), scanning electronic microscopy (SEM), X-ray energy dispersion spectrum (EDS), and temperature-programmed H2 reduction (H2-TPR) were used to characterize the crystalline, textural, morphological, and reducibility of the products. The three way catalytic performances of the supported products was tested in stoichiometric air/fuel condition...
June 9, 2017: Journal of Colloid and Interface Science
Tetyana V Beregova, Karine S Neporada, Maksym Skrypnyk, Tetyana M Falalyeyeva, Nadiya M Zholobak, Oleksandr B Shcherbakov, Mykola Ya Spivak, Rostyslav V Bubnov
BACKGROUND: Nowadays, we face the global epidemic of obesity, that is known to contribute to the development of many diseases, such as the oral cavity pathologies. Dental and oral pathologies are frequently caused by and overlapped with systemic multifactorial diseases such as obesity being its early indicators and risk factors. The aim was to study the influence of nanoceria on periodontal tissues alteration in glutamate (MSG)-induced obese rats. METHODS: We included 52 Wistar rats of both genders and divided into four groups: newborn rats in group 1 (control) received subcutaneously 8 μl/g saline...
March 2017: EPMA Journal
P Arunkumar, R Ramaseshan, S Dash, K Suresh Babu
Quest for efficient ion conducting electrolyte thin film operating at intermediate temperature (~600 °C) holds promise for the real-world utilization of solid oxide fuel cells. Here, we report the correlation between mixed as well as preferentially oriented samarium doped cerium oxide electrolyte films fabricated by varying the substrate temperatures (100, 300 and 500 °C) over anode/ quartz by electron beam physical vapor deposition. Pole figure analysis of films deposited at 300 °C demonstrated a preferential (111) orientation in out-off plane direction, while a mixed orientation was observed at 100 and 500 °C...
June 14, 2017: Scientific Reports
Artur Braun, Qianli Chen
Hydration of oxygen-deficient metal oxides causes filling of oxygen vacancies and formation of hydroxyl groups with interstitial structural protons, rotating around the oxygen in localized motion. Thermal activation from 500 to 800 K triggers delocalization of the protons by jumping to adjacent oxygen ions, constituting proton conductivity. We report quantitative analyses of proton and lattice dynamics by neutron-scattering data, which reveal the interaction of protons with the crystal lattice and proton-phonon coupling...
June 14, 2017: Nature Communications
K Saravanakumar, R Karthik, Shen-Ming Chen, J Vinoth Kumar, K Prakash, V Muthuraj
In this study, we report a series of novel palladium nanoparticles (Pd) supported cerium oxide (CeO2)/graphitic carbon nitride (g-C3N4) nanocomposites, fabricated via the simple strategy, which were used for the detoxification of toxic hexavalent chromium to benign trivalent chromium under visible light irradiation. The synthesized Pd/CeO2/g-C3N4 nanocomposites were characterized by various tools including powder X-ray diffraction (PXRD), fourier transform infrared (FTIR), X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance spectra (DRS/UV-vis), high resolution transmission electron microscopy (HRTEM), and energy dispersive X-ray spectra (EDS)...
June 3, 2017: Journal of Colloid and Interface Science
Cheng Peng, Ying Chen, Zhichao Pu, Qing Zhao, Xin Tong, Yongsheng Chen, Lin Jiang
Despite considerable research on the environmental impacts of nanomaterials, we know little about how they influence interactions between species. Here, we investigated the acute (12 d) and chronic (64 d) toxicities of cerium oxide nanoparticles (CeO2 NPs) and bulk particles (0 ∼ 200 mg/L) to three ciliated protist species (Loxocephalus sp., Paramecium aurelia, and Tetrahymena pyriformis) in single-, bi-, and multispecies microcosms. The results show that CeO2 NPs strongly affected the interactions between ciliated protozoan species...
June 8, 2017: Nanotoxicology
Yingfei Xue, Sricharani Rao Balmuri, Akhil Patel, Vinayak Sant, Shilpa Sant
Cerium oxide nanoparticles (CNPs) represent a promising class of antioxidant nanoparticles with potential therapeutic value. Due to the easily reversible oxidation states of cerium (Ce(3+) and Ce(4+)) at the nanoscale, CNPs scavenge excessive reactive oxygen and nitrogen species in a self-regenerative manner. In this study, we have demonstrated a simple method to functionalize shape-specific CNPs (i.e., rod- and cube-shaped) with polyethylene glycol (PEG) and studied the effect of PEGylation on the physico-chemical properties, antioxidant activity, and biocompatibility of rod- and cube-shaped CNPs...
June 6, 2017: Drug Delivery and Translational Research
Lorenzo Rossi, Weilan Zhang, Xingmao Ma
Rapidly growing global population adds significant strains on the fresh water resources. Consequently, saline water is increasingly tapped for crop irrigation. Meanwhile, rapid advancement of nanotechnology is introducing more and more engineered nanoparticles into the environment and in agricultural soils. While some negative effects of ENPs on plant health at very high concentrations have been reported, more beneficial effects of ENPs at relatively low concentrations are increasingly noticed, opening doors for potential applications of nanotechnology in agriculture...
June 2, 2017: Environmental Pollution
Jingcheng Hao, Ling Wang, Yitong Wang, Xiaofeng Sun, Geping Zhang, Shuli Dong
Self-assembly exploits noncovalent interactions to offer a facile and effective method for the soft materials construction with multi-functionalities and diversity. In this work, fluorescence carbon quantum dots with coordinated Ce3+ ions (CQDCe) were firstly synthesized and exploited as building blocks to generate a series of hierarchical structures via ionic self-assembly of CQDCe and biomolecules, DNA, myoglobin (Mb) and hyaluronic acid (HA). In particularly, the vesicles can be constructed by simple mixing oppositely-charged CQDCe and DNA in water...
June 4, 2017: Chemistry: a European Journal
Gajalakshmi Sekar, N Prem Kumar, Amitava Mukherjee, Natarajan Chandrasekaran
Physicochemical characterization of CeO2NPs using UV-vis, FTIR and XRD have confirmed the characteristic identity and fluorite phase of their crystalline nature. The interaction studies between cerium oxide nanoparticles (CeO2NPs) and HSA were investigated using fluorescence emission and synchronous spectra, UV-vis absorbance, FTIR, FT-Raman and Circular Dichroism spectroscopy. Thermodynamic parameters and Stern-Volmer plot has conveyed the existence of the ground state complex raised due to static quenching...
June 1, 2017: International Journal of Biological Macromolecules
Eleanor Spielman-Sun, Enzo Lombi, Erica Donner, Daryl Howard, Jason M Unrine, Gregory V Lowry
Nanoparticle (NP) physiochemical properties, including surface charge, affect cellular uptake, translocation, and tissue localization. To evaluate the influence of surface charge on NP uptake by plants, wheat seedlings were hydroponically exposed to 20 mg/L of ∼4 nm CeO2 NPs functionalized with positively charged, negatively charged, and neutral dextran coatings. Fresh, hydrated roots and leaves were analyzed at various time points over 34 h using fluorescence X-ray absorption near-edge spectroscopy to provide laterally resolved spatial distribution and speciation of Ce...
June 16, 2017: Environmental Science & Technology
Rafael Hernandez Damascena Dos Passos, Madjid Arab, Carlson Pereira de Souza, Christine Leroux
For the first time, a ternary tetragonal scheelite structure tungstate with strontium and cerium cations, (Sr,Ce)WO4, was synthesized. As much as 35% Ce could be inserted into the structure, leaving 1\over 7 of the (Sr,Ce) cation sites vacant. Partial ordering of Sr and Ce, with atomic displacements, were shown by high-resolution electron microscopy. Two-dimensional incommensurate modulations occur in this material, in small domains 20 nm in size. The band gap of this compound is significantly lower than the band gap of SrWO4 and this was related to the distortions of WO4 and (Sr,Ce)O8 polyhedra...
June 1, 2017: Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials
Fei Pan, Hao-Long Chen, Yen-Hsun Su, Yen-Hao Su, Weng-Sing Hwang
Inclusion species formed in SS400 steel with Ce-addition was predicted by thermodynamic calculation. The analysis of the inclusion morphology and size distribution was carried out by applying Scanning Electron Microscopy (SEM) and Transmission Electron Microscope (TEM). Nano-Fe3O4 particles were also found in cerium-deoxidized and -desulfurized steel and their shapes were nearly spherical. The complex Ce2O3 inclusions covering a layer of 218 nm composed by several MnS particles with similar diffraction pattern...
May 31, 2017: Scientific Reports
Mariadas Valan Arasu, R Thirumamagal, M P Srinivasan, Naif Abdullah Al-Dhabi, A Ayeshamariam, D Saravana Kumar, N Punithavelan, M Jayachandran
Nanomaterials of CeO2 with A. vera were synthesized by using simple chemical method. Grapes drops are used as an oxidizing agent. Structural and morphological studies of nanomaterials of cerium oxide (CeO2), were studied for combustion method of preparation. The precursor solution was initialized by a hydrothermal reaction. Cerium hydroxyl carbonate precursors which involves cerium (III) nitrate Ce(NO3)3. 6 H2O with (1.0M) of seashell powder, 3% A. vera, extracts, grapes and pomegranate drops and this complex solution was used to produce the CeO2 powder particles...
May 24, 2017: Journal of Photochemistry and Photobiology. B, Biology
Ishwar Prasad Sahu, D P Bisen, K V R Murthy, R K Tamrakar
Ca2 MgSi2 O7 :Ce(3+) , Ca2 MgSi2 O7 :Eu(2+) and Ca2 MgSi2 O7 :Eu(2+) ,Ce(3+) phosphors were prepared using the solid-state reaction method. The crystal structures of the sintered phosphors were of melilite type, which has a tetragonal crystallography. The chemical compositions of the sintered phosphors was confirmed by energy dispersive X-ray spectroscopy. The different thermoluminescence kinetic parameters [activation energy (E), frequency factor (s) and order of the kinetics (b)] of these phosphors were evaluated and compared using the peak shape method...
May 29, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
C Maria Magdalane, K Kaviyarasu, J Judith Vijaya, B Siddhardha, B Jeyaraj
Ceria (CeO2) is an exciting alternative noble metal catalyst, because it has ability to release and absorb oxygen in the redox system, and function as an oxygen buffer. In this study, heterostructured catalysts consisting of CeO2/Y2O3 nanocomposites were successfully synthesized by hydrothermal method in the presence of sodium hydroxide as a reducing agent from cerium nitrate and yttrium nitrate as a precursor which was then evaluated for its photocatalytic activity in the degradation of Rhodamine B (RhB) synthetic dye...
May 20, 2017: Journal of Photochemistry and Photobiology. B, Biology
Haiwei Du, Tao Wan, Bo Qu, Jason Scott, Xi Lin, Adnan Younis, Dewei Chu
Lattice defects, for example oxygen vacancies in cerium oxide (CeO2), usually play a vital role in determining physical and chemical properties, including catalytic performance and resistance switching behaviour. Here, tin (Sn) was introduced as a dopant in one dimensional CeO2 nanostructures to investigate oxygen vacancy modulation and achieve improved catalytic properties and a tunable electrical performance. Our findings revealed that the Sn-doped CeO2 nanorods maintained their morphology while the aspect ratio decreased gradually with increasing Sn content...
May 21, 2017: Journal of Colloid and Interface Science
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