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https://www.readbyqxmd.com/read/28213304/photocatalytic-effects-of-titanium-dioxide-nanoparticles-on-aquatic-organisms-current-knowledge-and-suggestions-for-future-research
#1
REVIEW
Vena N Haynes, J Evan Ward, Brandon J Russell, Alexander G Agrios
Nanoparticles are entering natural systems through product usage, industrial waste and post-consumer material degradation. As the production of nanoparticles is expected to increase in the next decade, so too are predicted environmental loads. Engineered metal-oxide nanomaterials, such as titanium dioxide, are known for their photocatalytic capabilities. When these nanoparticles are exposed to ultraviolet radiation in the environment, however, they can produce radicals that are harmful to aquatic organisms...
February 9, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28213246/spinel-type-manganese-ferrite-mnfe2o4-microspheres-a-novel-affinity-probe-for-selective-and-fast-enrichment-of-phosphopeptides
#2
Xing-Yu Long, Jia-Yuan Li, Dong Sheng, Hong-Zhen Lian
The spinel-type magnetic manganese ferrite (MnFe2O4) microspheres synthesized by simple solvothermal method were used as a novel adsorbent for selective enrichment and effective isolation of phosphopeptides. The uniform MnFe2O4 magnetic affinity microspheres (MAMSs) had a narrow particle size distribution between 250 and 260nm, and displayed superparamagnetism with a saturation magnetization value of 67.0emu/g. Comprehensively, the possible formation mechanism of MnFe2O4 microspheres with ferric and manganous sources as dual precursors was elucidated by comparison with those of Fe3O4 nanoparticles and MnOOH nanosheets respectively with either ferric or manganous source as single precursor...
May 1, 2017: Talanta
https://www.readbyqxmd.com/read/28213245/one-pot-synthesis-of-gold-carbon-dots-nanocomposite-and-its-application-for-cytosensing-of-metals-for-cancer-cells
#3
Hani Nasser Abdelhamid, Abuo Talib, Hui-Fen Wu
Cytosensing of biological transition metals is paramount important for cancer research. One-pot synthesis of the nanocomposite of carbon dots (CDs) and gold nanoparticles (AuNPs) is reported and has been applied for metal cytosensing. The nanocomposite (GCDs) is synthesized using citric acid (CA) and L-cysteine as precursors in the presence of chloroauric acid. The synthesis procedure exhibits many advantages including simple one step, green approach (solvent free method) and requires cheap chemical precursors...
May 1, 2017: Talanta
https://www.readbyqxmd.com/read/28212817/in-vivo-toxicity-of-copper-oxide-lead-oxide-and-zinc-oxide-nanoparticles-acting-in-different-combinations-and-its-attenuation-with-a-complex-of-innocuous-bio-protectors
#4
Ilzira A Minigalieva, Boris A Katsnelson, Vladimir G Panov, Larisa I Privalova, Anatoly N Varaksin, Vladimir B Gurvich, Marina P Sutunkova, Vladimir Ya Shur, Ekaterina V Shishkina, Irene E Valamina, Ilya V Zubarev, Oleg H Makeyev, Ekaterina Y Meshtcheryakova, Svetlana V Klinova
Stable suspensions of metal oxide nanoparticles (Me-NPs) obtained by laser ablation of 99.99% pure copper, zinc or lead under a layer of deionized water were used separately, in three binary combinations and a triple combination in two independent experiments on rats. In one of the experiments the rats were instilled with Me-NPs intratracheally (i.t.) (for performing a broncho-alveolar lavage in 24hrs to estimate the cytological and biochemical indices of the response of the lower airways), while in the other, Me-NPs were repeatedly injected intraperitoneally (i...
February 14, 2017: Toxicology
https://www.readbyqxmd.com/read/28212282/collagen-gold-nanoparticle-conjugates-for-versatile-biosensing
#5
Sarah Unser, Samuel Holcomb, ReJeana Cary, Laura Sagle
Integration of noble metal nanoparticles with proteins offers promising potential to create a wide variety of biosensors that possess both improved selectivity and versatility. The multitude of functionalities that proteins offer coupled with the unique optical properties of noble metal nanoparticles can allow for the realization of simple, colorimetric sensors for a significantly larger range of targets. Herein, we integrate the structural protein collagen with 10 nm gold nanoparticles to develop a protein-nanoparticle conjugate which possess the functionality of the protein with the desired colorimetric properties of the nanoparticles...
February 15, 2017: Sensors
https://www.readbyqxmd.com/read/28212026/isotope-tracers-to-study-the-environmental-fate-and-bioaccumulation-of-metal-containing-engineered-nanoparticles-techniques-and-applications
#6
Yongguang Yin, Zhiqiang Tan, Ligang Hu, Sujuan Yu, Jingfu Liu, Guibin Jiang
The rapidly growing applicability of metal-containing engineered nanoparticles (MENPs) has made their environmental fate, biouptake, and transformation important research topics. However, considering the relatively low concentration of MENPs and the high concentration of background metals in the environment and in organisms, tracking the fate of MENPs in environment-related scenarios remains a challenge. Intrinsic labeling of MENPs with radioactive or stable isotopes is a useful tool for the highly sensitive and selective detection of MENPs in the environment and organisms, thus enabling tracing of their transformation, uptake, distribution, and clearance...
February 17, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/28211526/stable-optical-trapping-and-sensitive-characterization-of-nanostructures-using-standing-wave-raman-tweezers
#7
Mu-Ying Wu, Dong-Xiong Ling, Lin Ling, William Li, Yong-Qing Li
Optical manipulation and label-free characterization of nanoscale structures open up new possibilities for assembly and control of nanodevices and biomolecules. Optical tweezers integrated with Raman spectroscopy allows analyzing a single trapped particle, but is generally less effective for individual nanoparticles. The main challenge is the weak gradient force on nanoparticles that is insufficient to overcome the destabilizing effect of scattering force and Brownian motion. Here, we present standing-wave Raman tweezers for stable trapping and sensitive characterization of single isolated nanostructures with a low laser power by combining a standing-wave optical trap with confocal Raman spectroscopy...
February 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28211363/nanowire-networks-and-hollow-nanospheres-of-ag-au-bimetallic-alloys-at-room-temperature
#8
R Britto Hurtado, M Cortez-Valadez, H Arizpe-Chávez, N S Flores-Lopez, Ramón A B Álvarez, M Flores-Acosta
Due to their physicochemical properties, metallic nanoalloys have potential applications in biomedicine, electrocatalysis and electrochemical sensors, among many other fields. New alternative procedures have emerged in order to reduce production costs and the use of toxic substances. In this study we present a novel low-toxicity synthesis method for the fabrication of nanowire networks (NWNs) and Ag-Au hollow nanospheres. The synthesis process is performed at room temperature without any sophisticated equipment, such as special cameras or furnaces, etc...
March 17, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28211359/electrodeposition-of-wo3-nanoparticles-into-surface-mounted-metal-organic-framework-hkust-1-thin-films
#9
Hyeonseok Yoo, Alexander Welle, Wei Guo, Jinsub Choi, Engelbert Redel
We describe a novel procedure to fabricate WO3@surface-mounted metal-organic framework (SURMOF) hybrid materials by electrodeposition of WO3 nanoparticles into HKUST-1, also termed Cu3(BTC)2 SURMOFs. These materials have been characterized using x-ray diffraction, time-of-flight secondary ion mass spectrometry, scanning electron microscopy, x-ray photoelectron spectroscopy as well as linear sweep voltammetry. The WO3 semiconductor/SURMOF heterostructures were further tested as hybrid electrodes in their performance for hydrogen evolution reaction from water...
March 17, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28209054/confinement-of-ultrasmall-cu-znox-nanoparticles-in-metal-organic-frameworks-for-selective-methanol-synthesis-from-catalytic-hydrogenation-of-co2
#10
Bing An, Jingzheng Zhang, Kang Cheng, Pengfei Ji, Cheng Wang, Wenbin Lin
The interfaces of Cu/ZnO and Cu/ZrO2 play vital roles in the hydrogenation of CO2 to methanol by these composite catalysts. Surface structural reorganization and particle growth during catalysis deleteriously reduce these active interfaces, diminishing both catalytic activities and MeOH selectivities. Here we report the use of pre-assembled bpy and Zr6(μ3-O)4(μ3-OH)4 sites in UiO-bpy metal-organic frameworks (MOFs) to anchor ultrasmall Cu/ZnOx nanoparticles, thus preventing the agglomeration of Cu NPs and phase separation between Cu and ZnOx in MOF cavity-confined Cu/ZnOx nanoparticles...
February 17, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28208297/label-free-lspr-detection-of-trace-lead-ii-ions-in-drinking-water-by-synthetic-poly-mpd-co-asa-nanoparticles-on-gold-nanoislands
#11
Guangyu Qiu, Siu Pang Ng, Xiongyi Liang, Ning Ding, Xiangfeng Chen, Chi-Man Lawrence Wu
Using self-assembly gold nanoislands (SAM-AuNIs) functionalized by poly(m-phenylenediamine-co-aniline-2-sulfonic acid) (poly(mPD-co-ASA)) copolymer nanoparticles as specific receptors, a highly sensitive localized surface plasmon resonance (LSPR) optochemical sensor is demonstrated for detection of trace lead cation (Pb(II)) in drinking water. The copolymer receptor is optimized in three aspects: (1) mole ratio of mPD:ASA monomers, (2) size of copolymer nanoparticles, and (3) surface density of the copolymer...
February 7, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28208287/highly-uniform-gold-nanobipyramids-for-ultrasensitive-colorimetric-detection-of-influenza-virus
#12
Shaohua Xu, Wenjun Ouyang, Peisi Xie, Yi Lin, Bin Qiu, Zhenyu Lin, Guonan Chen, Longhua Guo
Gold nanoparticles (AuNPs) have been frequently utilized for the construction of diverse colorimetric biosensors. Normally, AuNPs with sharp edges could have better sensitivity. However, the poor monodipersity of AuNPs with sharp edges seriously confines their utility for colorimetric biosensing. Herein, we demonstrate the utility of highly uniform gold nanobipyramids (Au NBPs) for ultrasensitive colorimetric detection of H5N1 virus. The proposed method is based on the fact that alkaline phosphatase (ALP) could catalyze the decomposition of 4-aminophenyl phosphate (4-APP) to generate 4-aminophenol (4-AP), which would then reduce silver nitrate to metal silver and then deposited on Au NBPs...
February 7, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28207240/interfaces-in-heterogeneous-catalysts-advancing-mechanistic-understanding-through-atomic-scale-measurements
#13
Wenpei Gao, Zachary D Hood, Miaofang Chi
Developing novel catalysts with high efficiency and selectivity is critical for enabling future clean energy conversion technologies. Interfaces in catalyst systems have long been considered the most critical factor in controlling catalytic reaction mechanisms. Interfaces include not only the catalyst surface but also interfaces within catalyst particles and those formed by constructing heterogeneous catalysts. The atomic and electronic structures of catalytic surfaces govern the kinetics of binding and release of reactant molecules from surface atoms...
February 16, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28207233/nanoscale-pdo-catalyst-functionalized-co3o4-hollow-nanocages-using-mof-templates-for-selective-detection-of-acetone-molecules-in-exhaled-breath
#14
Won-Tae Koo, Sunmoon Yu, Seon-Jin Choi, Ji-Soo Jang, Jun Young Cheong, Il-Doo Kim
The increase of surface area and the functionalization of catalyst are crucial to develop high-performance semiconductor metal oxide (SMO) based chemi-resistive gas sensors. Herein, nanoscale catalyst loaded Co3O4 hollow nanocages (HNCs) by using metal-organic framework (MOF) templates have been developed as a new sensing platform. Nanoscale Pd nanoparticles (NPs) were easily loaded on the cavity of Co based zeolite imidazole framework (ZIF-67). The porous structure of ZIF-67 can restrict the size of Pd NPs (2-3 nm) and separate Pd NPs from each other...
February 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28207229/efficient-and-durable-bifunctional-oxygen-catalysts-based-on-nifeo-mnox-core-shell-structures-for-rechargeable-zn-air-batteries
#15
Yi Cheng, Shuo Dou, Jean-Pierre Veder, Shuangyin Wang, Martin Saunders, San Ping Jiang
Rechargeable Zn-air battery is limited by the sluggish kinetics and poor durability of the oxygen catalysts. In this paper, a new bifunctional oxygen catalyst has been developed through embedding the ultrafine NiFeO nanoparticles (NPs) in a porous amorphous MnOx layer, in which the NiFeO-core contributes to the high activity for oxygen evolution reaction (OER) and the amorphous MnOx-shell functions as active phase for oxygen evolution reaction (OER), promoted by the synergistic effect between the NiFeO core and MnOx shell...
February 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28205434/recent-advances-on-magnetic-relaxation-switching-assay-based-nanosensors
#16
Yang Zhang, Hong Yang, Zhiguo Zhou, Kai Huang, Shi-Ping Yang, Gang Han
Magnetic relaxation switching assay (MRSw)-based nanosensors respond to the changes of transverse relaxation time (T2) of water molecules resulted from the analyte-induced aggregation / disaggregation of magnetic nanoparticles (MNPs). This strategy has been widely applied to the detections of various substrates from heavy metal ions to organic pollutants, proteins, nucleic acids, bacteria/viruses, and specific cells. Compared with other nanosensors, MRSw-based nanosensors not only are free from the background interferences, signal bleaching, and quenching but also overcome light scattering from samples without pre-treatments...
February 16, 2017: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/28202242/effects-of-monovalent-and-divalent-metal-cations-on-the-aggregation-and-suspension-of-fe3o4-magnetic-nanoparticles-in-aqueous-solution
#17
Hao Wang, Xiaoli Zhao, Xuejiao Han, Zhi Tang, Shasha Liu, Wenjing Guo, Chaobing Deng, Qingwei Guo, Huanhua Wang, Fengchang Wu, Xiaoguang Meng, John P Giesy
There has been limited research investigating how the mechanisms of aggregation of magnetic nanoparticles (MNPs) are affected by inorganic ions. In this study, Na(+), Mg(2+), Ca(2+), Sr(2+) and Ba(2+) were selected to systematically study the aggregation mechanisms of Fe3O4 MNPs. The results indicated that divalent cations more significantly affected the stabilities of MNPs than Na(+) at low concentrations (e.g., 0.1mM) in a decreasing order of Ba(2+)>Sr(2+)>Ca(2+)>Mg(2+)>Na(+). Extended DLVO theory did not offer a satisfactory explanation for the above difference due because it ignores specific ion effects...
February 12, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28198896/size-dependent-stability-of-cobalt-nanoparticles-on-silica-under-high-conversion-fischer-tropsch-environment
#18
Moritz Wolf, Hendrik Kotzé, Nico Fischer, Michael Claeys
Highly monodisperse cobalt crystallites, supported on Stöber silica spheres, as model catalysts for the Fischer-Tropsch synthesis were exposed to simulated high conversion environments in the presence and absence of CO utilising an in house developed in situ magnetometer. The catalyst comprising the smallest crystallites in the metallic state (average diameter of 3.2 nm) experienced pronounced oxidation whilst the ratio of H2O to H2 was increased stepwise to simulate CO conversions from 26% up to complete conversion...
February 15, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28196769/nanoparticles-of-wc-co-wc-co-and-cu-of-relevance-for-traffic-wear-particles-particle-stability-and-reactivity-in-synthetic-surface-water-and-influence-of-humic-matter
#19
Yolanda S Hedberg, Jonas F Hedberg, Sara Isaksson, Nanxuan Mei, Eva Blomberg, Susanna Wold, Inger Odnevall Wallinder
Studded tyres made of tungsten carbide cobalt (WC-Co) are in the Northern countries commonly used during the winter time. Tungsten (W)-containing nano- and micron-sized particles have been detected close to busy roads in several European countries. Other typical traffic wear particles consist of copper (Cu). The aims of this study were to investigate particle stability and transformation/dissolution properties of nanoparticles (NPs) of WC-Co compared with NPs of tungsten carbide (WC), cobalt (Co), and Cu. Their physicochemical characteristics (primarily surface oxide and charge) are compared with their extent of sedimentation and metal release in synthetic surface water (SW) with and without two different model organic molecules, 2,3- and 3,4-dihydroxybenzoic acid (DHBA) mimicking certain sorption sites of humic substances, for time periods up to 22 days...
February 11, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28196455/toxicological-perturbations-of-zinc-oxide-nanoparticles-in-the-coelatura-aegyptiaca-mussel
#20
Sohair R Fahmy, Dawlat A Sayed
More research is needed to understand the interactions of nanoparticles (NPs) with aquatic organisms and their mechanism of toxic action. Zinc oxide nanoparticles (ZnONPs) are the most used engineered metal oxide NPs in consumer products. The present study was designed to evaluate the cytotoxicity, genotoxicity and digestive gland (DG) as well as gill histopathology of the freshwater molluscan bivalve Coelatura aegyptiaca following exposure to ZnONPs (2, 10 and 50 mg/L) for 6 consecutive days. Exposure to ZnONPs (10 and 50 mg/L) induced a significant increase in malondialdehyde, superoxide dismutase and nitric oxide with a concomitant decrease in reduced glutathione, glutathione-S-transferase and catalase levels in the haemolymph, DG and gills of the treated mussels...
January 1, 2017: Toxicology and Industrial Health
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