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https://www.readbyqxmd.com/read/28643002/genotoxicity-testing-of-different-surface-functionalized-sio2-zro2-and-silver-nanomaterials-in-3d-human-bronchial-models
#1
Andrea Haase, Nils Dommershausen, Markus Schulz, Robert Landsiedel, Philipp Reichardt, Benjamin-Christoph Krause, Jutta Tentschert, Andreas Luch
Inhalation is considered a critical uptake route for NMs, demanding for sound toxicity testing using relevant test systems. This study investigates cytotoxicity and genotoxicity in EpiAirway™ 3D human bronchial models using 16 well-characterized NMs, including surface-functionalized 15 nm SiO2 (4 variants), 10 nm ZrO2 (4), and nanosilver (3), ZnO NM-110, TiO2 NM-105, BaSO4 NM-220, and two AlOOH NMs. Cytotoxicity was assessed by LDH and ATP assays and genotoxicity by the alkaline comet assay. For 9 NMs, uptake was investigated using inductively coupled plasma-mass spectrometry (ICP-MS)...
June 22, 2017: Archives of Toxicology
https://www.readbyqxmd.com/read/28639671/construction-of-unique-two-dimensional-mos2-tio2-hybrid-nanojunctions-mos2-as-a-promising-cost-effective-cocatalyst-toward-improved-photocatalytic-reduction-of-co2-to-methanol
#2
Wenguang Tu, Yichang Li, Libang Kuai, Yong Zhou, Qinfeng Xu, Haijin Li, Xiaoyong Wang, Min Xiao, Zhigang Zou
Two-dimensional MoS2 nanosheets were in situ grown on TiO2 nanosheets to form two-dimensional (2D) hybrid nanojunctions, with which MoS2 nanosheets compactly contact with TiO2 to increase the interfacial area. MoS2 was identified as a promising cost-effective substitute for noble metal cocatalysts such as Pt, Au, and Ag, and shows superior activity and selectivity for reducing CO2 to CH3OH in aqueous solution to these metal cocatalysts under UV-vis light irradiation. The photo-luminescence (PL) spectra and transient time-resolved PL decay measurements reveal that the fast electron transfer from TiO2 to MoS2 can minimize charge recombination losses to improve the conversion efficiency of photoreduction...
June 22, 2017: Nanoscale
https://www.readbyqxmd.com/read/28639026/regulation-of-engineered-nanomaterials-current-challenges-insights-and-future-directions
#3
Racliffe W S Lai, Katie W Y Yeung, Mana M N Yung, Aleksandra B Djurišić, John P Giesy, Kenneth M Y Leung
Substantial production and wide applications of engineered nanomaterials (ENMs) have raised concerns over their potential influences on the environment and humans. However, regulations of products containing ENMs are scarce, even in countries with the greatest volume of ENMs produced, such as the United States and China. After a comprehensive review of life cycles of ENMs, five major challenges to regulators posed by ENMs are proposed in this review: (a) ENMs exhibit variable physicochemical characteristics, which makes them difficult for regulators to establish regulatory definition; (b) Due to diverse sources and transport pathways for ENMs, it is difficult to monitor or predict their fates in the environment; (c) There is a lack of reliable techniques for quantifying exposures to ENMs; (d) Because of diverse intrinsic properties of ENMs and dynamic environmental conditions, it is difficult to predict bioavailability of ENMs on wildlife and the environment; and (e) There are knowledge gaps in toxicity and toxic mechanisms of ENMs from which to predict their hazards...
June 22, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28629075/fabrication-of-chitosan-au-tio2-nanotube-based-dry-electrodes-for-electroencephalography-recording
#4
Yanjuan Song, Penghai Li, Mingji Li, Hongji Li, Cuiping Li, Dazhi Sun, Baohe Yang
In this paper, we describe a method for fabricating dry electrodes for use in recording electroencephalograms (EEGs), which are based on the use of chitosan (Ch), gold (Au) particles, and titanium dioxide (TiO2) nanotube arrays deposited on titanium (Ti) thin sheets. The samples were characterized by scanning electron microscopy, X-ray diffraction, electrochemical impedance spectroscopy, and EEG signal collection. The TiO2 nanotube arrays were grown on the Ti thin sheet by an electrochemical anodic oxidation method...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28626359/noble-metal-modified-octahedral-anatase-titania-particles-with-enhanced-activity-for-decomposition-of-chemical-and-microbiological-pollutants
#5
Z Wei, M Endo, K Wang, E Charbit, A Markowska-Szczupak, B Ohtani, E Kowalska
Octahedral anatase particles (OAPs) were prepared by hydrothermal (HT) reaction of titanate nanowires (TNWs). OAPs were modified with noble metals (Au, Ag, Cu and Pt) by two photodeposition methods: in the absence and in the initial presence of oxygen in the system. Photocatalytic activities for oxidative decomposition of acetic acid and anaerobic dehydrogenation of methanol under UV/vis irradiation and for oxidation of 2-propanol under visible light irradiation were investigated. Antibacterial activities for bacteria (Escherichia coli) and fungi (Candida albicans) were investigated in the dark and under UV irradiation and/or visible light irradiation...
June 15, 2017: Chemical Engineering Journal
https://www.readbyqxmd.com/read/28605067/nanometer-scale-phase-transformation-determines-threshold-and-memory-switching-mechanism
#6
Byeong-Gyu Chae, Jae-Bok Seol, Jeong-Hwan Song, Kyungjoon Baek, Sang-Ho Oh, Hyunsang Hwang, Chan-Gyung Park
Creation of nanometer-scale conductive filaments in resistive switching devices makes them appealing for advanced electrical applications. While in situ electrical probing transmission electron microscopy promotes fundamental investigations of how the conductive filament comes into existence, it does not provide proof-of-principle observations for the filament growth. Here, using advanced microscopy techniques, electrical, 3D compositional, and structural information of the switching-induced conductive filament are described...
June 12, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28600938/highly-synergistic-antimicrobial-activity-of-spherical-and-flower-like-hierarchical-titanium-dioxide-silver-composites
#7
Junwei Ye, Hang Cheng, Hong Li, Yaoyao Yang, Siqi Zhang, Abdul Rauf, Qi Zhao, Guiling Ning
A spherical titanium dioxide/silver (TiO2/Ag) composite and a flower-like hierarchical TiO2/Ag composite were prepared via a template-induced method and a solvothermal method based on the Ag/Carbon spheres templates followed by calcination treatment, respectively. The morphologies of the composites were controlled by changing the concentration of reactants and calcination temperature. The antibacterial efficiency of the composites was evaluated with both Gram-negative Escherichia coli and Gram-positive Staphylococcus aureus, respectively...
May 31, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28598483/the-photocurrent-response-in-the-perovskite-device-based-on-coordination-polymers-structure-topology-band-gap-and-matched-energy-levels
#8
Hai-Qiang Luo, Xiao-Han Xing, Pan Zhang, Zhi-Shuo Yan, Qing-Feng Zhou, Yun Gong, Jian-Hua Lin
Using a rigid ditopic ligand, 4,5-di(4'-carboxylphenyl)benzene (H2L), three coordination polymers (CPs) formulated as MnL(H2O)2 (1), CdL(H2O) (2) and Mn2L2(DMF)3 (3) have been synthesized and structurally characterized by single-crystal X-ray diffraction. These three CPs display 2D architectures but with different topologies. The experimental data and DFT calculation indicate that CP 2 is a semiconductor, and its CB/VB energy levels match with those of the perovskite CH3NH3PbI3. A FTO/TiO2/CH3NH3PbI3/CP 2 device is fabricated and the CP-based device shows much larger photoresponse under visible light illumination (650 nm > λ > 350 nm, 100 mW cm(-2)) than the individual CP 2...
June 9, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28577321/chlorophyll-based-organic-inorganic-heterojunction-solar-cells
#9
Yue Li, Wenjie Zhao, Mengzhen Li, Gang Chen, Wang Xiaofeng, Xueqi Fu, Osamu Kitao, Hitoshi Tamiaki, Tokowa Sakai, Toshitaka Ikeuchi, Shin-Ichi Sasaki
We demonstrate solid-state chlorophyll solar cells (CSCs) employing a carboxylated chlorophyll derivative, methyl trans-32-carboxy-pyropheophorbide a as a light-harvesting dye sensitizer chlorophyll (DSC) deposited on mesoporous TiO2, on which four zinc hydroxylated chlorophyll derivatives were spin-coated for hole transporter chlorophylls (HTCs). The key parameters including the effective carrier mobility of the HTC films determined by the space charge-limited current method and the frontier molecular orbitals of these DSC and HTCs estimated from the cyclic voltammetry and the electronic absorption spectra suggest that both their charge separation and carrier transport are favorable...
June 3, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28574064/efficiency-enhancement-in-dye-sensitized-solar-cells-using-the-shape-size-dependent-plasmonic-nanocomposite-photoanodes-incorporating-silver-nanoplates
#10
Hyun-Jun Hwang, Sung-Jun Joo, Supriya A Patil, Hak-Sung Kim
In this work, we describe the efficiency enhancement in dye-sensitized solar cells (DSSCs) by using TiO2/silver nanoplate plasmonic nanocomposite photoanodes. The nanocomposite photoanodes with tunable plasmonic properties assembled from shape/size-selected silver (Ag) nanoplates were applied to enhance the light absorption for high-performance DSSCs. It was found that the localized surface plasmon resonance can be tuned over a range from 500 to 1000 nm, which is strongly dependent on the shape and size of Ag nanoplates and the refractive index of the surrounding dielectric...
June 2, 2017: Nanoscale
https://www.readbyqxmd.com/read/28571856/ag-agbr-tio2-rgo-nanocomposite-synthesis-characterization-photocatalytic-activity-and-aggregation-evaluation
#11
Penghua Wang
Ag-AgBr/TiO2 supported on reduced graphene oxide (Ag-AgBr/TiO2/RGO) with different mass ratios of grapheme oxide (GO) to TiO2 were synthesized via a facile solvothermal-photo reduction method. Compared to the single-, two- and three-component nanocomposites, the four-component nanocomposite, Ag-AgBr/TiO2/RGO-1 with mass ratio of GO to TiO2 at 1%, exhibited a much higher photocatalytic activity for the degradation of penicillin G (PG) under white light-emitting diode (LED-W) irradiation. The PG degradation efficiency increased with the increase of mass ratio of GO to TiO2 from 0...
June 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28548289/effects-of-food-borne-nanomaterials-on-gastrointestinal-tissues-and-microbiota
#12
REVIEW
Hans Bouwmeester, Meike van der Zande, Mark A Jepson
Ingestion of engineered nanomaterials is inevitable due to their addition to food and prevalence in food packaging and domestic products such as toothpaste and sun cream. In the absence of robust dosimetry and particokinetic data, it is currently challenging to accurately assess the potential toxicity of food-borne nanomaterials. Herein, we review current understanding of gastrointestinal uptake mechanisms, consider some data on the potential for toxicity of the most commonly encountered classes of food-borne nanomaterials (including TiO2 , SiO2, ZnO, and Ag nanoparticles), and discuss the potential impact of the luminal environment on nanoparticle properties and toxicity...
May 26, 2017: Wiley Interdisciplinary Reviews. Nanomedicine and Nanobiotechnology
https://www.readbyqxmd.com/read/28539585/natural-convection-flow-of-a-nanofluid-in-an-inclined-square-enclosure-partially-filled-with-a-porous-medium
#13
A I Alsabery, A J Chamkha, H Saleh, I Hashim
This work analyses free convection flow of a nanofluid in an inclined square enclosure consisting of a porous layer and a nanofluid layer using the finite difference methodology. Sinusoidal temperature boundary conditions are imposed on the two opposing vertical walls. Nanofluids with water as base and Ag or Cu or Al2O3 or TiO2 nanoparticles are considered for the problem. The related parameters of this study are the Darcy number, nanoparticle volume fraction, phase deviation, amplitude ratio, porous layer thickness and the inclination angle of the cavity...
May 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28534918/fabrication-of-metal-semiconductor-nanocomposites-by-selective-laser-nano-welding
#14
Huiwu Yu, Xiangyou Li, Zhongqi Hao, Wei Xiong, Lianbo Guo, Yongfeng Lu, Rongxing Yi, Jiaming Li, Xinyan Yang, Xiaoyan Zeng
A green and simple method to prepare metal/semiconductor nanocomposites by selective laser nano-welding metal and semiconductor nanoparticles was presented, in which the sizes, phases, and morphologies of the components can be maintained. Many types of nanocomposites (such as Ag/TiO2, Ag/SnO2, Ag/ZnO2, Pt/TiO2, Pt/SnO2, and Pt/ZnO) can be prepared by this method and their corresponding performances were enhanced.
June 1, 2017: Nanoscale
https://www.readbyqxmd.com/read/28507303/silver-nanoparticles-decorated-titanium-oxynitride-nanotube-arrays-for-enhanced-solar-fuel-generation
#15
Khaled A Soliman, Abdallah F Zedan, Ahmed Khalifa, Hany A El-Sayed, Amina S Aljaber, Siham Y AlQaradawi, Nageh K Allam
We demonstrate, for the first time, the synthesis of highly ordered titanium oxynitride nanotube arrays sensitized with Ag nanoparticles (Ag/TiON) as an attractive class of materials for visible-light-driven water splitting. The nanostructure topology of TiO2, TiON and Ag/TiON was investigated using FESEM and TEM. The X-ray photoelectron spectroscopy (XPS) and the energy dispersive X-ray spectroscopy (EDS) analyses confirm the formation of the oxynitride structure. Upon their use to split water photoelectrochemically under AM 1...
May 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28497205/transmission-electron-microscopy-artifacts-in-characterization-of-the-nanomaterial-cell-interactions
#16
Yu Hang Leung, Mu Yao Guo, Angel P Y Ma, Alan M C Ng, Aleksandra B Djurišić, Natalie Degger, Frederick C C Leung
We investigated transmission electron microscopy artifacts obtained using standard sample preparation protocols applied to the investigation of Escherichia coli cells exposed to common nanomaterials, such as TiO2, Ag, ZnO, and MgO. While the common protocols for some nanomaterials result only in known issues of nanomaterial-independent generation of anomalous deposits due to fixation and staining, for others, there are reactions between the nanomaterial and chemicals used for post-fixation or staining. Only in the case of TiO2 do we observe only the known issues of nanomaterial-independent generation of anomalous deposits due to exceptional chemical stability of this material...
May 11, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28493879/heterogeneous-ag-tio2-sio2-composite-materials-as-novel-catalytic-systems-for-selective-epoxidation-of-cyclohexene-by-h2o2
#17
Xin Wang, Jianyue Xue, Xinyun Wang, Xiaoheng Liu
TiO2-SiO2 composites were synthesized using cetyl trimethyl ammonium bromide (CTAB) as the structure directing template. Self-assembly hexadecyltrimethyl- ammonium bromide TiO2-SiO2/(CTAB) were soaked into silver nitrate (AgNO3) aqueous solution. The Ag-TiO2-SiO2(Ag-TS) composite were prepared via a precipitation of AgBr in soaking process and its decomposition at calcination stage. Structural characterization of the materials was carried out by various techniques including X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), N2 adsorption-desorption and ultraviolet visible spectroscopy (UV-Vis)...
2017: PloS One
https://www.readbyqxmd.com/read/28471649/three-dimensional-self-organization-in-nanocomposite-layered-systems-by-ultrafast-laser-pulses
#18
Zeming Liu, Jan Siegel, Mario Garcia-Lechuga, Thierry Epicier, Yaya Lefkir, Stéphanie Reynaud, Matthieu Bugnet, Francis Vocanson, Javier Solis, Guy Vitrant, Nathalie Destouches
Controlling plasmonic systems with nanometer resolution in transparent films and their colors over large nonplanar areas is a key issue for spreading their use in various industrial fields. Using light to direct self-organization mechanisms provides high-speed and flexible processes to meet this challenge. Here, we describe a route for the laser-induced self-organization of metallic nanostructures in 3D. Going beyond the production of planar nanopatterns, we demonstrate that ultrafast laser-induced excitation combined with nonlinear feedback mechanisms in a nanocomposite thin film can lead to 3D self-organized nanostructured films...
May 9, 2017: ACS Nano
https://www.readbyqxmd.com/read/28463658/bactericidal-mechanisms-and-effector-targets-of-tio2-and-nbsp-ag-tio2-against-staphylococcus-aureus
#19
Xuhong Jiang, Bin Lv, Yuan Wang, Qianhong Shen, Xinmin Wang
PURPOSE: In our previous study, Ag+-loaded TiO2 and Ag+-loaded SiO2 coatings for tracheal intubation were prepared to prevent ventilator-associated pneumonia (VAP), but the antimicrobial targets and the underlying mechanisms of TiO2 and Ag-TiO2 (Ag+) are still unclear. We attempted to elucidate the antimicrobial activity and potential mechanisms against Staphylococcus aureus. METHODOLOGY: The study tested the TiO2 and Ag+ bacteriostatic activity against S. aureus strains by MIC assays and S...
April 2017: Journal of Medical Microbiology
https://www.readbyqxmd.com/read/28463002/purely-visible-light-induced-photochromism-in-ag-tio2-nanoheterostructures
#20
D M Tobaldi, M J Hortigüela Gallo, G Otero-Irurueta, M K Singh, R C Pullar, M P Seabra, J A Labrincha
We report titania nanoheterostructures decorated with silver, exhibiting tuneable photochromic properties for the first time when stimulated only by visible white light (domestic indoor lamp), with no UV wavelengths. Photochromic materials show reversible color changes under light exposure. However, all inorganic photochromic nanoparticles (NPs) require UV light to operate. Conventionally, multicolor photochromism in Ag-TiO2 films involves a change in color to brownish-gray during UV-light irradiation (i.e...
May 10, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
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