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https://www.readbyqxmd.com/read/28107988/quantitative-assay-for-the-detection-screening-and-reactivity-evaluation-of-nanoceria-particles
#1
Ali Othman, Kristen Bear, Silvana Andreescu
Increasing use of engineered nanoparticles (NPs) in many industrial processes and consumer products requires rapid analytical methodologies to reliably detect and screen samples for the presence of NPs. Here, we report the development, analytical characterization and performance evaluation of a colorimetric assay as a comprehensive test for quantitative detection, screening and reactivity evaluation of nanoceria (cerium oxide, CeO2) particles in aqueous environments. We provide a critical discussion of the role of environmental conditions including pH, ionic composition, and presence of humic acid and particle type on the overall performance and sensitivity of this assay...
March 1, 2017: Talanta
https://www.readbyqxmd.com/read/28107921/highly-selective-enrichment-of-phosphopeptides-using-zr-4-immobilized-titania-nanoparticles
#2
Junyong Dai, Miaode Wang, Hailong Liu
It is urgent to selectively enrich trace phosphorylated proteins or peptides from complex biological sample for mass spectrometry (MS)-based phosphoproteomics. In this study, a novel immobilized metal affinity chromatography (IMAC) material with DOTA(1,4,7,10-tetraazacyclododecane N, N', N'', N'''-tetra-acetic acid) coated on the surface of TiO2 nanomaterials and functionalized with the metal ion Zr(4+)(TiO2@DOTA-Zr) has been synthesized successfully to improve the enrichment specificity and sensitivity for phosphopeptides...
March 1, 2017: Talanta
https://www.readbyqxmd.com/read/28107731/natural-amelioration-of-zinc-oxide-nanoparticle-toxicity-in-fenugreek%C3%A2-trigonella-foenum-gracum-by-arbuscular-mycorrhizal-glomus-intraradices-secretion-of-glomalin
#3
Narges Ghasemi Siani, Seyfollah Fallah, Lok Raj Pokhrel, Ali Rostamnejadi
Owing to rising production and use of engineered nanoparticles (ENPs) in the myriad of consumer applications, ENPs are being released into the environment where their potential fate and effects have remained unclear. With naturally occurring arbuscular mycorrhizal fungus (AMF; Glomus intraradices) in soils, their influence (positive or negative) on ENPs toxicity in plants is not well documented. Herein, we investigated potential influence of AMF on the growth and development in fenugreek (Trigonella foenum-graecum) under varied Zinc oxide nanoparticles (ZnONPs) treatments (0, 125, 250, 375 and 500 μg g(-1))...
January 3, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28107728/a-three-dimensional-core-shell-nanostructured-composite-of-polypyrrole-wrapped-mno2-reduced-graphene-oxide-carbon-nanotube-for-high-performance-lithium-ion-batteries
#4
Yong Li, Daixin Ye, Wen Liu, Bin Shi, Rui Guo, Haijuan Pei, Jingying Xie
Manganese oxides are promising anode materials for their high-energy density. However, they suffer from poor rate capability and fast capacity fading. Herein, we construct a three-dimensional (3D) core-shell structured polypyrrole (PPy)/MnO2-reduced graphene oxide (rGO)-carbon nanotubes (CNTs) composite via a facile two-step method. In the structure, the CNTs can facilitate fast electron conduction and keep structural integrity. The flexible and conductive rGO nanosheets work as both a reactive material and a carrier for MnO2 in-situ growth...
January 10, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28107662/a-simple-and-powerful-co-delivery-system-based-on-ph-responsive-metal-organic-frameworks-for-enhanced-cancer-immunotherapy
#5
Fei Duan, Xiaochen Feng, Xinjian Yang, Wentong Sun, Yi Jin, Huifang Liu, Kun Ge, Zhenhua Li, Jinchao Zhang
Tumor-associated antigens (TAAs)-loaded nanoparticles are able to be actively internalized by antigen-presenting cells (APCs) and have shown promising potential in cancer immunotherapy. However, current TAAs delivery strategy exhibits limitations of complicated synthesis process, low loading efficiency and inefficient CD8(+) cytotoxic T lymphocyte activation leading to unsatisfactory therapeutic effect. Thus, the construction of novel TAAs-delivery systems for enhanced cancer therapy is highly desirable. In this work, we fabricated a very simple yet powerful antigens-delivery system for cancer immunotherapy based-on pH-responsive metal-organic frameworks (MOFs) with size about 30 nm...
January 11, 2017: Biomaterials
https://www.readbyqxmd.com/read/28106897/transition-metal-co-ni-nanoparticles-wrapped-with-carbon-and-their-superior-catalytic-activities-for-the-reversible-hydrogen-storage-of-magnesium-hydride
#6
Xu Huang, Xuezhang Xiao, Wei Zhang, Xiulin Fan, Liuting Zhang, Changjun Cheng, Shouquan Li, Hongwei Ge, Qidong Wang, Lixin Chen
Magnesium hydride (MgH2) exhibits long-term stability and has recently been developed as a safe alternative to store hydrogen in the solid state, due to its high capacity of 7.6 wt% H2 and low cost compared to other metal hydrides. However, the high activation energy and poor kinetics of MgH2 lead to inadequate hydrogen storage properties, resulting in low energy efficiency. Nano-catalysis is deemed to be the most effective strategy in improving the kinetics performance of hydrogen storage materials. In this work, robust and efficient architectures of carbon-wrapped transition metal (Co/C, Ni/C) nanoparticles (8-16 nm) were prepared and used as catalysts in the MgH2 system via ball milling to improve its de/rehydrogenation kinetics...
January 20, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28106856/green-synthesis-and-characterization-of-palladium-nanoparticles-using-origanum-vulgare-l-extract-and-their-catalytic-activity
#7
Mohammed Rafi Shaik, Zuhur Jameel Qandeel Ali, Mujeeb Khan, Mufsir Kuniyil, Mohamed E Assal, Hamad Z Alkhathlan, Abdulrahman Al-Warthan, Mohammed Rafiq H Siddiqui, Merajuddin Khan, Syed Farooq Adil
The synthesis of Palladium (Pd) nanoparticles by green methods has attracted remarkable attention in recent years because of its superiority above chemical approaches, owing to its low cost and ecological compatibility. In this present work, we describe a facile and environmentally friendly synthesis of Pd nanoparticles (Pd NPs) using an aqueous extract of aerial parts of Origanum vulgare L. (OV) as a bioreductant. This plant is available in many parts of the world as well as in Saudi Arabia and is known to be a rich source of phenolic components, a feature we fruitfully utilized in the synthesis of Pd NPs, using various concentrations of plant extracts...
January 19, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28106214/copper-nanoparticle-interspersed-mos2-nanoflowers-with-enhanced-efficiency-for-co2-electrochemical-reduction-to-fuel
#8
Guodong Shi, Luo Yu, Xin Ba, Xiaoshu Zhang, Jianqing Zhou, Ying Yu
Electrocatalytic conversion of carbon dioxide (CO2) has been considered as an ideal method to simultaneously solve the energy crisis and environmental issue around the world. In this work, ultrasmall Cu nanoparticle interspersed flower-like MoS2 was successfully fabricated via a facile microwave hydrothermal method. The designed optimal hierarchical Cu/MoS2 composite not only exhibited remarkably enhanced electronic conductivity and specific surface area but also possessed improved CO2 adsorption capacity, resulting in a significant increase in overall faradaic efficiency and a 7-fold augmentation of the faradaic efficiency of CH4 in comparison with bare MoS2...
January 20, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28106128/fabrication-of-au-ag-nanocage-nayf4-nayf4-yb-er-core-shell-hybrid-and-its-tunable-upconversion-enhancement
#9
Xu Chen, Donglei Zhou, Wen Xu, Jinyang Zhu, Gencai Pan, Ze Yin, He Wang, Yongsheng Zhu, Cui Shaobo, Hongwei Song
Localized electric filed enhancement by surface plasmon resonance (SPR) of noble metal nanoparticles is an effective method to amplify the upconversion luminescence (UCL) strength of upconversion nanoparticles (UCNPs), whereas the highly effective UCL enhancement of UCNPs in colloids has not been realized until now. Here, we designed and fabricated the colloidal Au-Ag nanocage@NaYF4@NaYF4:Yb,Er core-shell hybrid with different intermediate thickness (NaYF4) and tunable SPR peaks from visible wavelength region to NIR region...
January 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28105903/criteria-to-define-a-more-relevant-reference-sample-of-titanium-dioxide-in-the-context-of-food-a-multiscale-approach
#10
William Dudefoi, Hélène Terrisse, Mireille Richard-Plouet, Eric Gautron, Florin Popa, Bernard Humbert, Marie-Hélène Ropers
Titanium dioxide (TiO2) is a transition metal oxide widely used as a white pigment in various applications, including food. Due to the classification of TiO2 nanoparticles as potentially harmful for humans by inhalation (IARC, 2006), the presence of nanoparticles in food products needed to be confirmed by a set of independent studies. Seven samples of food grade titanium dioxide (E171) were extensively characterised for their size distribution, crystallinity, and surface properties by the currently recommended methods...
January 20, 2017: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/28105488/effects-of-ceo2-nanoparticles-on-terrestrial-isopod-porcellio-scaber-comparison-of-ceo2-biological-potential-with-other-nanoparticles
#11
Olga Malev, Polonca Trebše, Małgorzata Piecha, Sara Novak, Bojan Budič, Miroslav D Dramićanin, Damjana Drobne
Nano-sized cerium dioxide (CeO2) particles are emerging as an environmental issue due to their extensive use in automobile industries as fuel additives. Limited information is available on the potential toxicity of CeO2 nanoparticles (NPs) on terrestrial invertebrates through dietary exposure. In the present study, the toxic effects of CeO2 NPs on the model soil organism Porcellio scaber were evaluated. Nanotoxicity was assessed by monitoring the lipid peroxidation (LP) level and feeding rate after 14-days exposure to food amended with nano CeO2...
January 19, 2017: Archives of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28105397/s-n-co-doped-graphene-nickel-cobalt-sulfide-aerogel-improved-energy-storage-and-electrocatalytic-performance
#12
Guanjie He, Mo Qiao, Wenyao Li, Yao Lu, Tingting Zhao, Rujia Zou, Bo Li, Jawwad A Darr, Junqing Hu, Maria-Magdalena Titirici, Ivan P Parkin
Metal sulfides are commonly used in energy storage and electrocatalysts due to their redox centers and active sites. Most literature reports show that their performance decreases significantly caused by oxidation in alkaline electrolyte during electrochemical testing. Herein, S and N co-doped graphene-based nickel cobalt sulfide aerogels are synthesized for use as rechargeable alkaline battery electrodes and oxygen reduction reaction (ORR) catalysts. Notably, this system shows improved cyclability due to the stabilization effect of the S and N co-doped graphene aerogel (SNGA)...
January 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/28103021/efficient-removal-of-methane-over-the-cobalt-monoxide-doped-aupd-nanocatalysts
#13
Shaohua Xie, Yuxi Liu, Jiguang Deng, Simiao Zang, Zhenhua Zhang, Hamidreza Arandiyan, Hongxing Dai
Catalytic total oxidation of CH4 at a relatively low temperature over the precious metal (e.g., Pd-, Rh- or Pt)-based catalyst is believed to be a potential technology for the removal of greenhouse gas CH4. The traditional Pd-based catalysts for CH4 combustion reported in the literature tend to deactivate at high temperatures (> 600 °C), because the PdOx active phase is easily changed into aggregated metallic Pd nanoparticles (NPs). The high cost of Pd also limits its wide applications. In order to overcome such drawbacks, we herein design a novel pathway by introducing a certain amount of CoO to the supported Au-Pd alloy NPs to generate high-performance Au-Pd-xCoO/3DOM Co3O4 (x is the Co/Pd molar ratio) catalysts...
January 19, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28102964/plasmonic-chirality-imprinting-on-nucleobase-displaying-supramolecular-nanohelices-by-metal-nucleobase-recognition
#14
Yiyang Lin, E Thomas Pashuck, Michael R Thomas, Nadav Amdursky, Shih-Ting Wang, Lesley W Chow, Molly M Stevens
Supramolecular self-assembly is an important process that enables the conception of complex structures mimicking biological motifs. Herein, we constructed helical fibrils through chiral self-assembly of nucleobase-peptide conjugates (NPCs), where achiral nucleobases are helically displayed on the surface of fibrils, comparable to polymerized nucleic acids. Selective binding between DNA and the NPC fibrils was observed with fluorescence polarization. Taking advantage of metal-nucleobase recognition, we highlight the possibility of deposition/assembly of plasmonic nanoparticles onto the fibrillar constructs...
January 19, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28102612/nickel-nanoparticles-encapsulated-in-few-layer-nitrogen-doped-graphene-derived-from-metal-organic-frameworks-as-efficient-bifunctional-electrocatalysts-for-overall-water-splitting
#15
You Xu, Wenguang Tu, Bowei Zhang, Shengming Yin, Yizhong Huang, Markus Kraft, Rong Xu
Nickel nanoparticles encapsulated in few-layer nitrogen-doped graphene (Ni@NC) have been synthesized by using a Ni-based metal-organic framework as the precursor for high-temperature annealing treatment. The resulting Ni@NC materials exhibit highly efficient and ultrastable electrocatalytic activity toward hydrogen evolution reaction and oxygen evolution reaction as well as overall water splitting in alkaline environment.
January 19, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28102397/highly-exposed-fe-n4-active-sites-in-porous-poly-iron-phthalocyanine-based-oxygen-reduction-electrocatalyst-with-ultrahigh-performance-for-air-cathode
#16
Ganesan Anandhababu, Syed Comail Abbas, Jiangquan Lv, Kui Ding, Qin Liu, Dickson D Babu, Yiyin Huang, Jiafang Xie, Maoxiang Wu, Yaobing Wang
Progress in the development of efficient electrocatalysts for oxygen reduction reactions is imperative for various energy systems such as metal-air batteries and fuel cells. In this paper, an innovative porous two-dimensional (2D) poly-iron-phthalocyanine (PFe-Pc) based oxygen reduction electrocatalyst created with a simple solid-state chemical reaction without pyrolysis is reported. In this strategy, silicon dioxide nanoparticles play a pivotal role in preserving the Fe-N4 structure during the polymerization process and thereby assist in the development of a porous structure...
January 19, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28101543/the-recent-development-of-efficient-earth-abundant-transition-metal-nanocatalysts
#17
REVIEW
Dong Wang, Didier Astruc
Whereas noble metal compounds have long been central in catalysis, Earth-abundant metal-based catalysts have in the same time remained undeveloped. Yet the efficacy of Earth-abundant metal catalysts was already shown at the very beginning of the 20th century with the Fe-catalyzed Haber-Bosch process of ammonia synthesis and later in the Fischer-Tropsch reaction. Nanoscience has revolutionized the world of catalysis since it was observed that very small Au nanoparticles (NPs) and other noble metal NPs are extraordinarily efficient...
January 19, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28099810/anisotropic-self-assembly-of-supramolecular-polymers-and-plasmonic-nanoparticles-at-the-liquid-liquid-interface
#18
Joseph J Armao, Irina Nyrkova, Gad Fuks, Artem Osypenko, Mounir Maaloum, Emilie Moulin, Raul Arenal, Odile Gavat, Alexander N Semenov, Nicolas Giuseppone
The study of supramolecular polymers in the bulk, in solution, and at the solid-liquid interface has recently become a major topic of interest, going from fundamental aspects to applications in materials science. However, examples of 1D supramolecular polymers at the liquid-liquid interface are mostly unexplored. Here we describe the light-assisted supramolecular polymerization of triarylamine molecules and their organization at a chloroform-water interface. The resulting interfacial nematic layer of these 1D supramolecular polymers is further used as a template for the precise alignment of spherical gold nanoparticles coming from the water phase...
January 18, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28098970/strong-enhancement-of-photoelectric-conversion-efficiency-of-co-hybridized-polymer-solar-cell-by-silver-nanoplates-and-core-shell-nanoparticles
#19
Wenfei Shen, Jianguo Tang, Yao Wang, Jixian Liu, Linjun Huang, Weichao Chen, Lanlan Yang, Wei Wang, Yanxin Wang, Renqiang Yang, Jungheum Yun, Laurence A Belfiore
A new way was meticulously designed to utilize the localized surface plasmon resonance (LSPR) effect and the light scattering effect of silver nanoplate (Ag-nPl) and core-shell Ag@SiO2 nanoparticles (Ag@SiO2-NPs) to enhance the photovoltaic performances of polymer solar cells (PSCs). To prevent direct contact between silver nanoparticles (Ag-NPs) and photo-active materials which will cause electrons quenching, bare Ag-nPl were spin-coated on indium tin oxide and silica capsulated Ag-NPs were incorporated to PBDTTT-C-T:PC71BM active layer...
January 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28098443/fe-cluster-pushing-electrons-to-n-doped-graphitic-layers-with-fe3c-fe-hybrid-nanostructure-to-enhance-o2-reduction-catalysis-of-zn-air-batteries
#20
Jie Yang, Jiangtao Hu, Mouyi Weng, Rui Tan, Lei-Lei Tian, Jinlong Yang, Joseph Amine, Jia-Xin Zheng, Haibiao Chen, Feng Pan
Non-noble metal catalysts with oxygen reduction reaction (ORR) performance comparable or even superior to that of Pt are extremely important for metal-air batteries and fuel cells. Here we report a simple and controllable strategy to synthesize Fe-cluster embedded in Fe3C nanoparticles (designated as Fe3C(Fe)) encased in nitrogen-doped Graphitic Layers (NDGL) with graphitic shells as a novel hybrid nanostructure as an effective ORR catalyst by directly pyrolyzing a mixture of Prussian blue (PB) and glucose...
January 18, 2017: ACS Applied Materials & Interfaces
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