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Zhi-Hui Zhang, Rajasekhar Balasubramanian
This study systematically examined the potential impacts of doping CeO2 and Fe(C5H5)2 nanoparticles as fuel-borne catalysts (FBCs) to ultralow sulfur diesel (ULSD) fuel on the physical, chemical and toxicological characteristics of diesel particulate matter (DPM). The FBCs-doped fuels are effective in promoting soot oxidation and reducing the DPM mass emissions, but lead to a significant increase in the total particle counts due to the formation of self-nucleated metallic nanoparticles. Compared to undoped ULSD, the FBCs-doped fuels result in higher concentrations of particle-phase polycyclic aromatic hydrocarbons (PAHs) and n-alkanes, higher fractions of organic carbon (OC) and water-soluble organic carbon (WSOC) in particles, show slight alterations in soot nanostructure, reduce soot ignition temperature and activation energy...
March 27, 2017: Environmental Science & Technology
R Jaisingh, R Shanbhog, B Nandlal, M Thippeswamy
AIM: To evaluate the effect of 10% cerium chloride intervention on pre-demineralised human enamel subjected to cycles of de- and remineralisation. METHODS: This was an in vitro, comparative type study of 60 human enamel samples that were randomly divided into control and test groups. The samples were then subjected to a cycle of demineralisation followed by intervention with respective treatment solutions (control group: placebo solution; test: 10% cerium chloride) for 30 s under constant agitation and then to a 2nd cycle of demineralisation followed by remineralisation using artificial saliva...
March 25, 2017: European Archives of Paediatric Dentistry: Official Journal of the European Academy of Paediatric Dentistry
Jie-Mei Chu, Tai-Lang Yin, Shu-Jian Zheng, Jing Yang, Bi-Feng Yuan, Yu-Qi Feng
Polycystic ovary syndrome (PCOS) is the most common cause of anovulatory infertility. The pathogenesis of PCOS remains unclear and early diagnosis of PCOS is challenging. Follicular fluid provides a unique window in the critical processes during oocyte and follicular maturation, and the metabolic level of follicular fluid has important impact on the developmental potential of oocytes and subsequent embryos. Previous studies demonstrated some modified ribonucleosides in biological fluids were diseases related metabolites...
May 15, 2017: Talanta
Ali Othman, Daniel Andreescu, Dinusha P Karunaratne, Suryadevara V Babu, Silvana Andreescu
Development of systems for capture, sequestration and tracking of nanoparticles (NPs) is becoming a significant focus in many aspects of nanotechnology and environmental research. These systems enable a broad range of applications for evaluating concentration, distribution and effects of NPs for environmental, clinical, epidemiological and occupational exposure studies. Herein, we describe the first example of a ligand-graft multifunctional platform for capture and detection of cerium oxide (CeO2 or ceria) NPs...
March 24, 2017: ACS Applied Materials & Interfaces
Panpan Guan, Yongjian Li, Jie Zhang, Wei Li
Copper oxide (CuO)-decorated cerium oxide (CeO₂) nanoparticles were synthesized and used to detect glucose non-enzymatically. The morphological characteristics and structure of the nanoparticles were characterized through transmission electron microscopy, X-ray photoelectron spectroscopy, and X-ray diffraction. The sensor responses of electrodes to glucose were investigated via an electrochemical method. The CuO/CeO₂ nanocomposite exhibited a reasonably good sensitivity of 2.77 μA mM(-1)cm(-2), an estimated detection limit of 10 μA, and a good anti-interference ability...
August 26, 2016: Nanomaterials
Nader Shehata, Soha Gaballah, Effat Samir, Aya Hamed, Marwa Saad
This paper introduces a new fluorescent nanocomposite of electrospun biodegradable nanofibers embedded with optical nanoparticles. In detail, this work introduces the fluorescence properties of PVA nanofibers generated by the electrospinning technique with embedded cerium oxide (ceria) nanoparticles. Under near-ultra violet excitation, the synthesized nanocomposite generates a visible fluorescent emission at 520 nm, varying its intensity peak according to the concentration of in situ embedded ceria nanoparticles...
June 1, 2016: Nanomaterials
Reiner Anwander, David Schneider, Frank Edelmann, Nicole Harmgarth
A series of heteroleptic tris(cyclopentadienyl) CeIV complexes has been isolated and crystallographically characterized, implying a broad accessibility of such organocerium(IV) compounds. The oxidation of complexes CpMe3Ce(thf) and Cp'3Ce(thf) (CpMe = C5H4Me, Cp' = C5H4SiMe3), bearing monosubstituted electron-poor cyclopentadienyl ligands, with either 0.5 equiv. 1,4-benzoquinone or C2Cl6 gave the cerium(IV) hydroquinolate and chloride complexes CpMe3Ce(OC6H4O)CeCpMe3, Cp'3Ce(OC6H4O)CeCp'3, as well as CpMe3CeCl and Cp'3CeCl, respectively...
March 23, 2017: Chemistry: a European Journal
Mohammad Hossein Sowlat, Babak Kakavandi, Saeedeh Lotfi, Masud Yunesian, Mohammad Abdollahi, Roshanak Rezaei Kalantary
In the present systematic review, we aimed to collect and analyze all the relevant evidence on the efficiency of cerium-impregnated versus virgin-activated carbons (ACs) for the removal of gas-phase elemental mercury (Hg(0)) from the flue gas of coal-fired power plants and to assess the effect of different calcination and operational parameters on their efficiency. A total of eight relevant papers (out of 1193 hits produced by the search) met the eligibility criteria and were included in the study. Results indicated that the Hg(0) adsorption capacity of cerium-impregnated ACs is significantly higher than that of virgin ACs, depending highly on the impregnation and operational parameters...
March 21, 2017: Environmental Science and Pollution Research International
Jane Ma, Bridget Bishoff, R R Mercer, Mark Barger, Diane Schwegler-Berry, Vincent Castranova
The emission of cerium oxide nanoparticles (CeO2) from diesel engines, using cerium compounds as a catalyst to lower the diesel exhaust particles, is a health concern. We have previously shown that CeO2 induced pulmonary inflammation and lung fibrosis. The objective of the present study was to investigate the modification of fibroblast function and the role of epithelial-mesenchymal transition (EMT) in CeO2-induced fibrosis. Male Sprague-Dawley rats were exposed to CeO2 (0.15 to 7mg/kg) by a single intratracheal instillation and sacrificed at various times post-exposure...
March 16, 2017: Toxicology and Applied Pharmacology
Ruofei Wu, Xingxing Jiang, Mingjun Xia, Lijuan Liu, Xiaoyang Wang, Zheshuai Lin, Chuangtian Chen
Hydrothermally grown iodate, K8Ce2I18O53, featuring polar 0D [Ce(IO3)8](4-) units, has shown the highest visible light driven (VLD) photocatalytic activity in metal iodates reported before. The enhanced VLD photocatalytic property results from a synergistic effect between the narrow band gap and polar 0D [Ce(IO3)8](4-) units, as confirmed using first principles calculations.
March 27, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
I Kamika, M Tekere
Rapidly developing industry raises concerns about the environmental impacts of nanoparticles, but the effects of inorganic nanoparticles on bacterial community in wastewater treatment remain unclear. The present research assessed the impact of cerium oxide nanoparticles (nCeO) on the microbiome of activated sludge system. The results showed that 18,330 over 28,201 reads generated from control samples were assigned to Proteobacteria while 5527 reads (19.6%), 3260 reads (11.567%), and 719 reads (2.55%) were assigned to unclassified_Bacteria, Firmicutes and Actinobacteria, respectively...
December 2017: AMB Express
Manju Bhargavi Gumpu, Noel Nesakumar, Srinidhi Nagarajan, Sadhana Ramanujam, Uma Maheswari Krishnan, K Jayanth Babu, John Bosco Balaguru Rayappan
Acetylcholinesterase (AChE) enzyme has been predominantly used for the detection of pesticides and metal ions. But, these sensors respond to pesticides as well as metal ions at certain concentration, which results in poor selectivity. Hence in this work, the amount of thiocholine produced during AChE inhibition has been estimated to detect the residual activity of AChE enzyme in-turn to enhance the efficiency of the biosensor. In this context, Pt/ZnO-CeO2/AChE/Chitosan based biosensor has been developed for sensitive voltammetric quantification of thiocholine in AChE...
March 16, 2017: Bulletin of Environmental Contamination and Toxicology
Salik Hussain, Preeti P Kodavanti, Jamie D Marshburn, Agnes Janoshazi, Stella M Marinakos, Margaret George, Annette Rice, Mark R Wiesner, Stavros Garantziotis
Cerium dioxide nanoparticles (nanoceria), currently used as catalysts including additives to diesel fuel, also present potential as a novel therapeutic agent for disorders involving oxidative stress. However, little is known about the effects of nanoceria on primary human cells involved in the innate immune response. Here, we evaluate nanoceria effects on monocyte derived macrophages (MDMs) from healthy human subjects. Peripheral blood monocytes were isolated from healthy human volunteers. MDMs were obtained by maturing monocytes over a five-day period...
December 2016: Journal of Biomedical Nanotechnology
Wolfram W Rudolph, Gert Irmer
Raman spectra of aqueous La(3+), Ce(3+), Pr(3+), Nd(3+) and Sm(3+) - perchlorate solutions were measured and weak strongly polarized Raman bands were detected at 343 cm(-1), 344 cm(-1), 347 cm(-1), 352 cm(-1) and 363 cm(-1), respectively. The full width at half height for these bands is quite broad (∼50 cm(-1)) in the isotropic spectrum and the band width increases with increasing solute concentration. The polarized Raman bands were assigned to the breathing modes of the nona-aqua ions of the mentioned rare earth ions...
March 27, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Muhammad Sajid Ali Asghar, Beverley J Inkson, Guenter Moebus
Dynamics of cerium oxide nanoparticle aqueous corrosion are revealed in-situ. We use innovative liquid-cell transmission electron microscopy (TEM) combined with deliberate high-intensity electron-beam irradiation of nanoparticle suspensions. This enables life video-recording of materials reactions in liquid, with nm-resolution. We introduce image-quantification to measure detailed rates of dissolution as a function of time and particle size to be compared with literature data. Giant dissolution rates, exceeding any previous reports for chemical dissolution rates at room temperature by many orders of magnitude, are discovered...
March 9, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
Edgar R López-Mena, Carlos R Michel, Alma H Martínez-Preciado, Alex Elías-Zuñiga
In this work, nanostructured CeO2 microspheres with high surface area and mesoporosity were prepared by the coprecipitation method, in absence of a template. The reaction between cerium nitrate and concentrated formic acid produced cerium formate, at room temperature. Further, calcination at 300 °C yielded single-phase CeO2 microspheres, with a diameter in the range 0.5-2.6 μm, the surface of these microspheres is completely nanostructured (diameter about 30-90 nm). CeO2 microspheres were used to fabricate a sensor device, and it was tested for intermediate CO gas concentrations (200-800 ppm)...
December 2017: Nanoscale Research Letters
Fahimeh Charbgoo, Mansor Bin Ahmad, Majid Darroudi
CeO2 nanoparticles (NPs) have shown promising approaches as therapeutic agents in biology and medical sciences. The physicochemical properties of CeO2-NPs, such as size, agglomeration status in liquid, and surface charge, play important roles in the ultimate interactions of the NP with target cells. Recently, CeO2-NPs have been synthesized through several bio-directed methods applying natural and organic matrices as stabilizing agents in order to prepare biocompatible CeO2-NPs, thereby solving the challenges regarding safety, and providing the appropriate situation for their effective use in biomedicine...
2017: International Journal of Nanomedicine
Jianshuai Mu, Xin Zhao, Jie Li, En-Cui Yang, Xiao-Jun Zhao
Development of nanomaterials-based enzymatic mimics has gained considerable attention in recent years, because of their low cost, high stability and efficiently catalytic ability. Here, CeO2 was successfully incorporated into the coral-like NiO nanostructures assembled by nanoflakes with high surface area, forming the coral-like CeO2/NiO nanocomposites. The morphology and composition of CeO2/NiO nanocomposites were characterized by XRD, SEM, element mapping and XPS. The results of characterization showed that cerium was highly dispersed in the coral-like NiO nanostructures...
May 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
Ho-Il Ji, Timothy C Davenport, Michael J Ignatowich, Sossina M Haile
Cerium dioxide, CeO2-δ, remains one of the most attractive materials under consideration for solar-driven thermochemical production of chemical fuels. Understanding the rate-limiting factors in fuel production is essential for maximizing the efficacy of the thermochemical process. The rate of response is measured here via electrical conductance relaxation methods using porous ceria structures with architectural features typical of those employed in solar reactors. A transition from behavior controlled by material surface reaction kinetics to that controlled by sweep-gas supply rates is observed on increasing temperature, increasing volume specific surface area, and decreasing normalized gas flow rate...
February 28, 2017: Physical Chemistry Chemical Physics: PCCP
Jens Christoffers, Irina Geibel, Anna Dierks, Thomas Müller
The cerium-catalyzed, aerobic coupling of β-oxoesters with enol acetates and dioxygen yields δ-lactones with a 1,4-diketone moiety. In contrast to the Baeyer-Villiger oxidation (BVO), where the higher substituted residue migrates, in this case of an oxidative C-C coupling reaction the less substituted alkyl residue undergoes a 1,2-shift. An endoperoxidic oxycarbenium ion comparable to the Criegee intermediate in the BVO is proposed as a reaction intermediate and submitted to conformational analysis by computational methods...
February 23, 2017: Chemistry: a European Journal
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