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Haimin Zhang, Guoqiang Liu, Zhiqing Cui, Miaomiao Han, Shengbo Zhang, Cuijiao Zhao, Chun Chen, Guozhong Wang
Electrosynthesis of NH3 from N2 reduction reaction (NRR) at ambient conditions has been regarded as a promising technology to replace the industrial energy and capital intensive Haber-Bosch process. Here we report a room-temperature spontaneous redox approach to fabricate core-shell structure Au@CeO2 composite with Au nanoparticle sizes below ~10 nm and loading amount of 3.6 wt.% for the NRR. The results demonstrate that the as-synthesized Au@CeO2 possesses a surface area of 40.7 m2 g-1 and porous structure, as electrocatalyst exhibiting high NRR activity with a NH3 yield rate of 28...
February 14, 2019: Chemistry: a European Journal
S Gunasekaran, A Dinesh, A Silambarasu, V Thirumurugan, S Shankar
Pure and Nd-doped cerium oxides (CeO₂, Ce0.075 Nd0.025 O and Ce0.050 Nd0.050 O) nanoparticles (NPs) were synthesized using Aloe vera leaf extract. X-ray powder diffraction studies were confirmed that synthesized pure and Nd3+ doped CeO₂ NPs and were exhibited cubic structure. FE-SEM image exhibited pure and Nd3+ doped CeO₂ NPs have spherical structure and Nd doped CeO2 NPs small pores were formed in the surface. EDAX spectral analysis used to identify the elemental compositions. FT-IR spectra shows various functional groups and were identified for pure and Nd3+ doped CeO₂ NPs...
July 1, 2019: Journal of Nanoscience and Nanotechnology
Martha Ilett, Rik Brydson, Andy Brown, Nicole Hondow
In situ characterisation of nanoparticle dispersion and surface coatings is required to further our understanding of the behaviour of nanoparticles in aqueous suspension. Using cryogenic transmission electron microscopy (cryo-TEM) it is possible to analyse a nanoparticle suspension in the frozen, hydrated state; however, this analysis is often limited to imaging alone. This work demonstrates the first use of analytical scanning TEM (STEM) in the examination of nanoparticles captured in a layer of vitreous ice...
January 31, 2019: Micron: the International Research and Review Journal for Microscopy
Atefeh Pesaraklou, Nasser Mahdavi-Shahri, Halimeh Hassanzadeh, Masoud Ghasemi, Mahboubeh Kazemi, Nasser Sanjar Mousavi, Maryam M Matin
Today advancements in nanotechnology have made extensive progress in tissue engineering. Application of cerium oxide nanoparticles (CeO2) has improved regenerative medicine due to their antioxidant properties. In this study, nanoparticles were used to increase the efficacy of skin substitutes. Human skin samples were decellularized using four methods and studied via histological stainings and DNA content analyses. Then CeO2 dispersing and its stability were investigated. The prepared acellular dermal matrices (ADMs) were immersed in CeO2 suspension and their effects were evaluated on growth of cultured human adipose derived-mesenchymal stem cells (hAd-MSCs) using MTT assay and histological methods...
February 12, 2019: Biomedical Materials
Yi Xu, Chao Wang, Jun Hou, Peifang Wang, Guoxiang You, Lingzhan Miao
In this paper, the effects of cerium oxide nanoparticles (CeO2 NPs) on the group bacterial behaviors were elaborated. After 36-h cultivation, the biofilm biomass was enhanced by the sub-lethal concentrations of 0.5 and 2 mg/L CeO2 NP exposure. Meanwhile, the promoted production of total amino acids in microbes further resulted in the increased surface hydrophobicity and percentage aggregation. To resist the CeO2 NPs stress, the biofilm exhibited a double-layer microstructure, with the protein (PRO) and living cells occupying the bottom, the polysaccharide (PS), and dead cells dominating the top...
February 5, 2019: Environmental Science and Pollution Research International
Yangyu Zhang, Zhenni Tan, Xiuyun Wang, Yingying Zhan, Yihong Xiao, Chaktong Au, Lilong Jiang
The design of heterogeneous catalysts of high efficiency for complete oxidation of volatile organic compounds (VOCs) is a challenge. In the present study, propane is adopted as a VOC representative, and core-shell structured ZnCo2O4@CeO2 catalysts with Ce decoration were synthesized and tested for propane combustion. Through SEM, STEM, and EDX analyses, the structure of the ZnCo2O4@CeO2 catalysts was characterized. The results of activity evaluation demonstrate that the presence of Ce can significantly promote catalytic performance, and the most suitable Ce content has been verified...
February 6, 2019: Nanoscale
Jing Wang, Xie Quan, Shuo Chen, Hongtao Yu, Guobin Liu
Heterogeneous catalytic ozonation, in which ozone is activated by various catalysts to produce reactive oxygen species (ROS), is an effective approach to degrade persistent organic pollutants in water. However, catalyst with high activity and good stability for catalytic ozonation still remains rare. In this work, a highly dispersed cerium oxide on oxidized carbon nanotubes (CeO2 -OCNT) were prepared and characterized by X-ray diffractometer (XRD), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), and temperature-programmed reduction using hydrogen (TPR-H2 ) experiments...
January 29, 2019: Journal of Hazardous Materials
Sania Naz, Syeda Tayyaba Batool Kazmi, Muhammad Zia
Widespread use of cerium oxide (CeO2 ) nanoparticles (NPs) is found in almost all areas of research due to their distinctive properties. CeO2 NPs synthesized via green chemistry have been characterized for antioxidant, phytochemical, and biological potential. Physical characterization through scanning electron microscopy, XRD, and TGA showed that the NPs are circular in shape, 20-25 nm in size, and stable in a wide range of temperature. NPs display significant antioxidant (32.7% free radical scavenging activity) and antileishmanial (IC50 48 µg mL-1 ) properties...
February 4, 2019: Journal of Biochemical and Molecular Toxicology
V Kalyanaraman, Sangeetha Vasudevaraj Naveen, N Mohana, R M Balaje, K R Navaneethakrishnan, B Brabu, S S Murugan, T S Kumaravel
An implantation study of cerium oxide nanoparticles (CeO2-NP) combined with 28-day systemic toxicity and genotoxicity studies aligned to current regulatory standards was conducted. The results suggested that local tissue reactions caused by CeO2-NP was minimal (implantation irritation index of less than 3) and was better tolerated than most other implant materials tested in our laboratory. Furthermore, CeO2-NP showed virtually no systemic toxicity or in vivo micronucleus induction in bone marrow via implantation route...
January 1, 2019: Toxicology Research
Chang Guo, Sarah Robertson, Ralf J M Weber, Alison Buckley, James Warren, Alan Hodgson, Joshua Z Rappoport, Konstantin Ignatyev, Kirsty Meldrum, Isabella Römer, Sameirah Macchiarulo, James Kevin Chipman, Tim Marczylo, Martin O Leonard, Timothy W Gant, Mark R Viant, Rachel Smith
Cerium oxide nanoparticles (CeO2 NPs), used in some diesel fuel additives to improve fuel combustion efficiency and exhaust filter operation, have been detected in ambient air and concerns have been raised about their potential human health impact. The majority of CeO2 NP inhalation studies undertaken to date have used aerosol particles of larger sizes than the evidence suggests are emitted from vehicles using such fuel additives. Hence, the objective of this study was to investigate the effects of inhaled CeO2 NP aerosols of a more environmentally relevant size, utilizing a combination of methods, including untargeted multi-omics to enable the broadest possible survey of molecular responses and synchrotron X-ray spectroscopy to investigate cerium speciation...
February 1, 2019: Nanotoxicology
Yanyu Bao, Chengrong Pan, Weitao Liu, Yunxia Li, Chuanxin Ma, Baoshan Xing
This study aims to assess the role of iron plaque (IP) on cerium (Ce) uptake and translocation by rice after CeO2 nanoparticles (NPs) exposure over a 4 days period. A hydroponic experiment was performed under two IP levels (low and high) combined with two CeO2 NPs size (14 nm and 25 nm). It was found that CeO2 NPs as the main form was absorbed by rice due to limited NPs dissolution in hydroponic solution. IP significantly reduced surface-Ce, root-Ce and shoot-Ce accumulation, irrespective of CeO2 NPs sizes...
January 15, 2019: Science of the Total Environment
Mohammad Mehdi Sabzehmeidani, Hajir Karimi, Mehrorang Ghaedi
CeO2 /Ag2 CrO4 composite photocatalyst was successfully fabricated using electrospinning and calcination and chemical precipitation method based on CeO2 ribbon-like fibers and characterized by field-emission scanning electron microscopy (FESEM), energy dispersive X-ray (EDX), X-ray diffraction (XRD), UV-Vis diffuse reflectance spectroscopy (DRS) and Fourier-transform infrared spectroscopy (FT-IR). The as-obtained CeO2 /Ag2 CrO4 composite used photocatalytic performance in the sonophotodegradation of rhodamine B in aqueous solution under visible-light (LED) irradiation...
January 26, 2019: Environmental Science and Pollution Research International
Feng Tan, Xiao Jiang, Xianliang Qiao, Daming Sun, Jinsuo Gao, Xie Quan, Jingwen Chen, Suyu Ren, Yi Wang
A diffusive gradients in thin films (DGT) method using a new high-capacity cerium oxide (CeO2 ) binding gel, for the first time, was developed for measuring dissolved inorganic arsenic in freshwater and seawater. The capacities of the new CeO2 binding gel were 682 μg and 375 μg for AsIII and AsV , respectively. The masses of AsIII and AsV accumulated by CeO2 -DGT device increased linearly with time and agreed well with the theoretical value calculated by DGT equation. The arsenic accumulation by CeO2 -DGT was independent of pH (4...
April 4, 2019: Analytica Chimica Acta
Megavath Vijay Kumar, Aluri Veeresh Babu, Puli Ravi Kumar
Biodiesel has been renowned as potential and alternative fuel for years. In order to improve the quality of the conventional fossil fuels, biodiesel, and air pollution from combustion, additives are essential to exploit. In this study, the uses of cerium oxide (CeO2 ) nanoparticle additive for B20 fuel in a diesel engine are investigated. The CeO2 nanoparticles with cetyl-trimethyl ammonium bromide are doped into the B20 fuel by using ultrasonicator. The purpose of the experimental work was adopted to enhance engine combustion and reduce the emissions with an approach of CeO2 nanoparticle additive...
January 21, 2019: Environmental Science and Pollution Research International
Komeil Kohansal, Ahmad Tavasoli, Ali Bozorg
Hydrothermal liquefaction of Scenedesmus obliquus has been optimized in a micro reactor using response surface methodology. Temperature, residence time and feedstock concentration were studied through central composite design to verify the optimized conditions leading to the highest yield of bio-crude and energy recovery. Based on the non-catalytic studies, temperature, feedstock concentration, and their interaction were respectively determined as the most effective variables. In order to improve the quality of produced bio-crude, the one step upgrading procedure was carried out in the presence of synthesized heterogeneous catalysts including Ni/AC, Ni/AC-CeO2 nanorods and Ni/CeO2 nanorods...
December 24, 2018: Bioresource Technology
Lulu Yao, Jiajun Gu, Weiqiang Wang, Tengfei Li, Dongling Ma, Qinglei Liu, Wang Zhang, Waseem Abbas, Ashkan Bahadoran, Di Zhang
Surface modification for templated synthesis is crucial to achieving three-dimensional (3D) architectured materials for catalysis, photonics, energy storage, etc. However, the existing facile and versatile modification methods (e.g. with dopamine and catechol) generate modification layers that are unstable in harsh environments. These methods are thus unsuitable for electrical applications. Here we report that Ce4+ can act as an effective surface modification reagent for a broad range of substrates (chitinous butterfly wings, carbon paper, nickel foam, and polyethylene terephthalate planks) with various structural features owing to its strong oxidizing ability and Lewis acid nature...
January 21, 2019: Nanoscale
Eric Nestor Tseng, Yin-Ting Hsiao, Yi-Che Chen, Shih-Yun Chen, Alexandre Gloter, Jenn-Ming Song
We investigate the role of interfaces and surfaces in the magnetic and surface enhanced Raman spectroscopy (SERS) properties of CeO2 hollow spheres decorated with Ag nanoparticles (H-CeO2@Ag). The composites, H-CeO2@Ag, were synthesized using a newly developed two-step process. The CeO2 hollow sphere diameter ranges from 100 nm to 2 μm and the grafted Ag nanoparticle (NP) size varies from 5 to 50 nm with a controllable coverage ratio. Spectroscopic and microscopic characterization confirms the formation of an interface between the Ag and ceria and shows different charge rearrangements occurring at both the interface and the surface...
January 21, 2019: Nanoscale
Victor M Lu, Felicity Crawshay-Williams, Benjamin White, Amy Elliot, Mark A Hill, Helen E Townley
Glioblastoma is a heterogeneous disease with multiple genotypic origins. Despite treatment protocols such as surgery, radiotherapy and chemotherapy, the prognosis for patients remains poor. This study investigates the cytotoxic and radiation dose-enhancing and radiosensitizing ability of five rare earth oxide nanoparticles, in two different immortalized mammalian cell lines; U-87 MG and Mo59K. Significant cytotoxicity was observed in U-87 MG cells when exposed to Nd2 O3 and La2 O3. Autophagy was also detected in cells after incubation with Nd2 O3...
December 2019: Artificial Cells, Nanomedicine, and Biotechnology
Kejun Feng, Biao Song, Xianfeng Li, Fangli Liao, Jilai Gong
An easily separated photocatalyst, magnetic multi-walled carbon nanotubes/cerium dioxide (MMWCNTs-CeO2 ) nanocomposite, has been successfully prepared by hydrothermal synthesis and subsequent loading of magnetic nanoparticles. The synthesized nanocomposite was characterized by scanning electron microscope, transmission electron microscopy, X-ray photoelectron spectroscopy, powder X-ray diffraction, and vibrating sample magnetometer. The characterization results indicated the successful synthesis of MMWCNTs-CeO2 nanocomposite...
January 15, 2019: Ecotoxicology and Environmental Safety
Shuyan Xue, Qingqing Li, Lei Wang, Wenbin You, Jie Zhang, Renchao Che
Oxide materials with redox properties have aroused growing interest in many applications. Introducing dopants into crystal lattice provides an effective way to optimize the catalytic activities of the oxides as well as their redox properties. Herein, CeO2 nanospheres codoped with Cu and Co (CuCo-CeO2 NSs) were first synthesized and exploited as efficient electrocatalysts for dual-mode electrochemical sensing of microRNA (miRNA). Since the doping of Cu and Co into the CeO2 lattice, large amounts of extra oxygen vacancies were generated, which remarkably enhances the redox and electrocatalytic properties of the CeO2 material...
January 17, 2019: Analytical Chemistry
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