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https://www.readbyqxmd.com/read/28350433/scalable-fabrication-of-photochemically-reduced-graphene-based-monolithic-micro-supercapacitors-with-superior-energy-and-power-densities
#1
Sen Wang, Zhong-Shuai Wu, Shuanghao Zheng, Feng Zhou, Chenglin Sun, Hui-Ming Cheng, Xinhe Bao
Micro-supercapacitors (MSCs) hold great promise as highly competitive miniaturized power sources satisfying the increased demand of smart integrated electronics. However, single-step scalable fabrication of MSCs with both high energy and power densities is still challenging. Here we demonstrate the scalable fabrication of graphene-based monolithic MSCs with diverse planar geometries and capable of superior integration by photochemical reduction of graphene oxide/TiO2 nanoparticle hybrid films. The resulting MSCs exhibit high volumetric capacitance of 233...
March 28, 2017: ACS Nano
https://www.readbyqxmd.com/read/28345932/formation-of-turmeric-based-thin-films-universal-and-transparent-coating
#2
Do Kyoung Yeon, So Hyun Ki, Jeanne Choi, Sung Min Kang, Woo Kyung Cho
Curry stains on clothes and dishes in daily life inspired us to investigate the potential use of a turmeric powder, major ingredient of curry, as a universal-coating material. After condition optimization, the coating solution was made by boiling and filtering a turmeric slurry, and the coating was performed at pH 3, leading to the formation of ultrathin and transparent films. Various inorganic and polymeric substrates were successfully coated with turmeric-based materials, including gold, TiO2, SiO2, glass, stainless steel, indium tin oxide, nylon, polyethylene, polycarbonate, polypropylene, acryl, and polyethylene terephthalate...
March 27, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28345719/new-insight-into-binary-tio2-c-nanocomposites-the-crucial-effect-of-an-interfacial-microstructure
#3
Jiandong Zhuang, Qinfen Tian, Qian Liu, Ping Liu, Xiurong Cui, Yuqi Li, Mizi Fan
Combining with carbon materials is a common and efficient strategy to improve the photocatalytic performance of TiO2. But the fundamental nature of the interfacial microstructures between carbon and TiO2 and how they affect the photocatalysis process remain controversial. In this work, hybrid TiO2@C nanocomposites with different carbon contents are synthesized. It is found that an interfacial disorder region with interfacial Ti-O-C bonds and abundant defects (oxygen vacancies, VO) can be generally formed from the chemical interactions between carbon and Ti-O-Ti skeletons...
March 27, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28345699/gold-and-iodine-diffusion-in-large-area-perovskite-solar-cells-under-illumination
#4
S Cacovich, L Ciná, F Matteocci, G Divitini, P A Midgley, A Di Carlo, C Ducati
Operational stability is the main issue hindering the commercialisation of perovskite solar cells. Here, a long term light soaking test was performed on large area hybrid halide perovskite solar cells to investigate the morphological and chemical changes associated with the degradation of photovoltaic performance occurring within the devices. Using Scanning Transmission Electron Microscopy (STEM) in conjunction with EDX analysis on device cross sections, we observe the formation of gold clusters in the perovskite active layer as well as in the TiO2 mesoporous layer, and a severe degradation of the perovskite due to iodine migration into the hole transporter...
March 27, 2017: Nanoscale
https://www.readbyqxmd.com/read/28345057/chemical-imaging-of-fischer-tropsch-catalysts-under-operating-conditions
#5
Stephen W T Price, David J Martin, Aaron D Parsons, Wojciech A Sławiński, Antonios Vamvakeros, Stephen J Keylock, Andrew M Beale, J Frederick W Mosselmans
Although we often understand empirically what constitutes an active catalyst, there is still much to be understood fundamentally about how catalytic performance is influenced by formulation. Catalysts are often designed to have a microstructure and nanostructure that can influence performance but that is rarely considered when correlating structure with function. Fischer-Tropsch synthesis (FTS) is a well-known and potentially sustainable technology for converting synthetic natural gas ("syngas": CO + H2) into functional hydrocarbons, such as sulfur- and aromatic-free fuel and high-value wax products...
March 2017: Science Advances
https://www.readbyqxmd.com/read/28343050/photocatalytic-efficiency-of-fe2o3-tio2-for-the-degradation-of-typical-dyes-in-textile-industries-effects-of-calcination-temperature-and-uv-assisted-thermal-synthesis
#6
Mohsen Nasirian, Ciro Fernando Bustillo-Lecompte, Mehrab Mehrvar
The inadequate management practices in industrial textile effluents have a considerable negative impact on the environment and human health due to the indiscriminate release of dyes. Photocatalysis is one of the diverse advance oxidation processes (AOPs) and titanium dioxide (TiO2) is recognized for its high oxidation and reduction power. A composite photocatalyst of Fe2O3/TiO2 is synthesized using different mass ratios of Fe:TiO2 to improve its photoactivity. The composite photocatalyst is calcined at 300-900 °C...
March 23, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28342756/photocatalytic-and-antimicrobial-activities-of-chitosan-tio2-nanocomposite
#7
K T Karthikeyan, A Nithya, K Jothivenkatachalam
Chitosan, a natural polysaccharide widely used for various biological applications due to their potential benefits. Incorporation of biomaterials with semiconductor has been exploited for waste water treatment and biological applications due to their nanometric sizes and biocompatibility of chitosan. Chitosan-Titanium dioxide (CS-TiO2) nanocomposite was synthesized and their optical, structural, spectral, thermal, morphological and elemental analyses were carried out by several techniques. The particle size of the synthesized CS-TiO2 nanocomposite was around 90nm and has a crystalline structure with anatase phase of TiO2...
March 22, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28342752/chitosan-doped-hybrid-tio2-nanocomposite-based-sol-gel-coating-for-the-corrosion-resistance-of-aluminum-metal-in-3-5-nacl-medium
#8
Balaji J, Sethuraman M G
The study outlines the role of chitosan, a biopolymer on corrosion behavior of Hy/nano-TiO2 based sol-gel coating over aluminum metal. In this study organic-inorganic hybrid sols were synthesized through hydrolysis and condensation of 3-glycidoxypropyltrimethoxy silane (GPTMS), tetraethoxysilane (TEOS) and titanium (IV) isopropoxide (TIP) in acidic solution. Chitosan was doped into sol-gel matrix and self-assembled over aluminum substrate. The resultant chitosan-doped-Hy/nano-TiO2 sol-gel coating was characterized by Fourier Transform Infrared (FT-IR) spectra, Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM) and Energy-Dispersive X-ray Spectroscopy (EDX) analyses...
March 22, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28342417/the-protective-roles-of-tio2-nanoparticles-against-uv-b-toxicity-in-daphnia-magna
#9
Jie Liu, Wen-Xiong Wang
Aquatic environments are increasingly under environmental stress due to ultraviolet (UV) radiation and potential inputs of nanoparticles with intense application of nanotechnology. In this study, we investigated the interaction between UV-B radiation and titanium nanoparticles (TiO2-NPs) in a model freshwater cladoceran Daphnia magna. UV-B toxicity to Daphnia magna was examined when the daphnids were exposed to a range of TiO2-NPs concentrations with an initial 5 or 10min of 200μW/cm(2) UV-B radiation. In addition, UV-B toxicity was also examined in the presence of TiO2-NPs in the body of daphnids...
March 22, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28342359/synergetic-effect-between-adsorption-and-photodegradation-on-nanostructured-tio2-activated-carbon-fiber-felt-porous-composites-for-toluene-removal
#10
Min Li, Bin Lu, Qin-Fei Ke, Ya-Jun Guo, Ya-Ping Guo
The low quantum efficiency and limited adsorption efficiency of TiO2 makes it only fit for the removal of VOCs with low concentrations. Herein, we for the first time fabricated nanostructured TiO2/activated carbon fiber felt (TiO2/ACFF) porous composites by the in situ deposition of TiO2 microspheres on the carbon fibers in ACFF. Interestingly, the TiO2 microspheres exhibit hierarchical nanostructures constructed by nanocrystals as building blocks. The TiO2/ACFF porous composites possess excellent adsorption and photodegradation properties for toluene because of the synergetic effects between the nanostructured TiO2 and ACFF...
March 15, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28342335/enhanced-antimicrobial-efficacy-of-thermal-reduced-silver-nanoparticles-supported-by-titanium-dioxide
#11
Yen-Chi Chen, Kuo-Pin Yu
The antimicrobial efficacy of silver nanoparticles (AgNPs) is influenced by many factors, including the particle size, AgNP oxidation state and support materials. In this study, AgNPs are synthesized and supported by two types of TiO2 powders (P25 and Merck TiO2) using two heat-treatment temperatures (120 and 200°C). The formation of well-dispersed AgNPs with diameters ranging from 3.2 to 5.7nm was confirmed using transmission electron microscopy. X-ray photoelectron spectroscopy and X-ray diffraction indicated that the majority of the AgNPs were reduced from Ag(+) to Ag(0) at 200°C...
March 18, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28340948/application-of-ultrasound-aided-method-for-the-synthesis-of-cds-incorporated-three-dimensional-tio2-photocatalysts-with-enhanced-performance
#12
Joon Yeob Lee, Wan-Kuen Jo
In this study, an ultrasound-aided hydrothermal-impregnation method was used to synthesize three-dimensional (3D) urchin-like CdS-TiO2 nanostructures (UCTs) with variable CdS content. The photocatalytic efficiencies (for degrading limonene and toluene vapor) of UCTs synthesized using the ultrasound-aided process were greater than those of UCTs fabricated without ultrasound treatment. In addition, the photocatalytic efficiencies of ultrasound-treated UCTs were greater than those of zero-dimensional ultrasound-treated CdS-TiO2 particles, which, in turn, were greater than those of untreated 3D TiO2...
March 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28338134/uniform-tio2-nanoparticles-induce-apoptosis-in-epithelial-cell-lines-in-a-size-dependent-manner
#13
Qingqing Sun, Takayuki Ishii, Koki Kanehira, Takeshi Sato, Akiyoshi Taniguchi
The size of titanium dioxide (TiO2) nanoparticles is a vital parameter that determines their cytotoxicity. However, most reported studies have employed irregular shapes and sizes of TiO2 nanoparticles, as it is difficult to produce nanoparticles of suitable sizes for research. We produced good model TiO2 nanoparticles of uniform shape and size for use in studying their cytotoxicity. In this work, spherical, uniform polyethylene glycol-modified TiO2 (TiO2-PEG) nanoparticles of differing sizes (100, 200, and 300 nm) were prepared using the sol-gel method...
March 24, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28337807/a-strategy-for-breaking-polyoxometalate-based-mofs-to-obtain-high-loading-amount-of-nanosized-polyoxometalate-clusters-to-improve-the-performance-of-dye-sensitized-solar-cells
#14
Xiaotao Zheng, Weilin Chen, Li Chen, Yijing Wang, Xiangwei Guo, Jiabo Wang, En-Bo Wang
Polyoxometalate (POM) has already been confirmed to act as an effective electron-transfer mediator for improving the power conversion efficiency (PCE) of dye-sensitized solar cells (DSSCs) based on our studies. However, it may be limited by the agglomeration of the polyoxoanions. In this paper, we improve our previous synthesis strategy by breaking the MOFs with POMs as the secondary building units ([Ni(bpp)(H2O)2]3[P2W18O62]·24H2O(1) and H6[Cu3(H2O)6(P2W18O62)2(3-dpye)6]·28H2O (2)) to design and synthesize small-size and high-dispersive POM nanoparticles by means of compositing with TiO2 via the calcination to remove the organic ligand...
March 24, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28336278/thermoplastic-starch-composites-with-tio2-particles-preparation-morphology-rheology-and-mechanical-properties
#15
A Ostafińska, J Mikešová, S Krejčíková, M Nevoralová, A Šturcová, A Zhigunov, D Michálková, M Šlouf
Composites of thermoplastic starch (TPS) with titanium dioxide particles (mTiO2; average size 0.1μm) with very homogeneous matrix and well-dispersed filler were prepared by a two-step method, including solution casting (SC) followed by melt mixing (MM). Light and scanning electron microscopy confirmed that only the two-step procedure (SC+MM) resulted in ideally homogeneous TPS/mTiO2 systems. The composites prepared by single-step MM contained non-plasticized starch granules and the composites prepared by single-step SC suffered from mTiO2 agglomeration...
March 20, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28336003/efficacy-of-a-titanium-dioxide-nanoparticles-based-indoor-anti-odor-product-as-assessed-by-electronic-nose-and-gaschromatography-mass-spectrometry
#16
Mara Mirasoli, Roberto Gotti, Massimo Di Fusco, Giulia Basaglia, Jessica Fiori, Aldo Roda
Indoor air pollutants and odorants may have psychological and physical impact on exposed individuals and the unpleasant room air is considered as one of the factors associated with sick building syndrome comprising general symptoms such as headache and lethargy. Approaches for improving the quality of indoor air are thus important as support for human health and well-being. Photo-oxidation catalyzed by titanium dioxide (TiO2), is one of the methods used for elimination of volatile organic compounds, which are the cause of odor nuisance in indoor and outdoor air...
March 9, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28333437/a-tio2-femnp-core-shell-nanorod-array-photoanode-for-efficient-photoelectrochemical-oxygen-evolution
#17
Desmond E Schipper, Zhenhuan Zhao, Andrew P Leitner, Lixin Xie, Fan Qin, Md Kamrul Alam, Shuo Chen, Dezhi Wang, Zhifeng Ren, Zhiming Wang, Jiming Bao, Kenton H Whitmire
A variety of catalysts have been developed for electrocatalytic oxygen evolution, but very few of them can be readily integrated with semiconducting light absorbers for photoelectrochemical or photocatalytic water splitting. Here, we demonstrate an efficient core/shell photoanode with a highly active oxygen evolution electrocatalyst shell (FeMnP) and semiconductor core (rutile TiO2) for photoelectrochemical oxygen evolution reaction (PEC-OER). Metal-organic chemical vapor deposition (MOCVD) from a single-source precursor was used to ensure good contact between the FeMnP and the TiO2...
March 23, 2017: ACS Nano
https://www.readbyqxmd.com/read/28333065/preparation-of-mesoporous-tio2-with-enhanced-photocatalytic-activity-towards-tannery-wastewater-degradation
#18
Weiwei Zhao, Xiu He, Yu Peng, Hongfeng Zhang, Donglan Sun, Xiaocong Wang
Ordered mesoporous TiO2 materials are successfully synthesized via a sol-gel route using butyl titanate as a precursor and sodium dodecyl benzene sulfonate surfactants as soft templates. The as-prepared TiO2 samples possess a relatively high surface area of 40.03 m(2)/g and the center of pore diameter distribution of 13.04 nm. They exhibit excellent photocatalytic activity towards degradation of organic pollutants in tannery wastewater under UV-light and natural sunlight irradiation. The effect of the catalyst dosage, the pH value of the solution and the concentration of H2O2 are discussed in detail...
March 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28332611/visible-light-focusing-flat-lenses-based-on-hybrid-dielectric-metal-metasurface-reflector-arrays
#19
Qingbin Fan, Pengcheng Huo, Daopeng Wang, Yuzhang Liang, Feng Yan, Ting Xu
Conventional metasurface reflector-arrays based on metallic resonant nanoantenna to control the wavefront of light for focusing always suffer from strong ohmic loss at optical frequencies. Here, we overcome this challenge by constructing a non-resonant, hybrid dielectric-metal configuration consisting of TiO2 nanofins associated with an Ag reflector substrate that provides a broadband response and high polarization conversion efficiency in the visible range. A reflective flat lens based on this configuration shows an excellent focusing performance with the spot size close to the diffraction limit...
March 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28331171/accelerated-ecotoxicity-of-photoreactive-nanoparticles-on-moina-macrocopa
#20
Sun-Hwa Nam, Yu-Jin Shin, Youn-Joo An
Zinc oxide nanoparticles (ZnO NPs) and titanium dioxide nanoparticles (TiO2 NPs) are well known as photoreactive NPs. Various phototoxicity of ZnO NPs and TiO2 NPs on several organisms were reported. There was still necessity to evaluate toxicity of photoreactive ZnO NPs and TiO2 NPs due to species-specific effects under various irradiation conditions. We compared acute toxicity of Moina macrocopa under visible, UVA, and UVB irradiations, according to Organization for Economic Cooperation and Development guidelines for the testing of chemicals (Test No...
March 22, 2017: Environmental Health and Toxicology
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