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Che-Wei Chang, Xiangchen Huo, Tsair-Fuh Lin
The aims of this study are to evaluate, under visible light conditions, the ability of H2 O2 and TiO2 to produce OH, their quantitative impacts on the cell integrity of Microcystis, and the subsequent release and degradation of microcystins (MCs). A sequential reaction model was developed, including one sub-model to simulate the rupture kinetics for cell integrity of Microcystis, and another to describe the release and degradation of MCs. For cell rupture, the dual-oxidant Delayed Chick-Watson model (DCWM) and dual-oxidant Hom model (HM) were first proposed and developed, giving excellent simulation results of cell rupture kinetics...
May 14, 2018: Water Research
A Jbeli, A M Ferraria, A M Botelho do Rego, S Boufi, S Bouattour
Thin films of chitosan (CS) coated on glass substrates were used as support for the immobilization of nanostructures TiO2 /ZnS via a mild chemical process followed by a hydrothermal treatment at 90 °C. The preparation route involved the coating of the CS film on the glass substrate followed by the deposition of a thin layer of Ti(OBu)4 precursor and immersion in a solution of Zn(O2 CCH3 )2 and Na2 S. After a hydrothermal treatment at 90 °C, an even layer of TiO2 anatase decorated by ZnS nanorods was generated...
May 21, 2018: International Journal of Biological Macromolecules
Vahid Goudarzi, Iman Shahabi-Ghahfarrokhi
This paper reports on an experiment in which starch/kefiran/TiO2 (SKT)-based bio-nanocomposite films were developed and modified by photo-chemical reaction. In so doing, film-forming solutions were exposed to ultraviolet A (UV-A) for different times (1, 6, and 12 h). The obtained results indicated that increasing UV-A exposure time brought about an increase (≈14.9%) in the tensile strength of bio-nanocomposites. However, elongation at break and Young's modulus of irradiated film specimen decreased (≈32%, ≈12%, respectively) by increasing UV-A exposure time, and the moisture-sensitive parameters of specimen decreased using UV-A irradiation...
May 21, 2018: International Journal of Biological Macromolecules
Adam Heller, Karalee Jarvis, Sheryl S Coffman
Pigment-grade titanium dioxide (TiO2) of 200-300 nm particle diameter is one of the most widely used submicron-sized particle materials. Inhaled and ingested TiO2 particles are known to enter the bloodstream, to be phagocytized by macrophages and neutrophils, to be inflammatory, and to activate the NLRP3 inflammasome. In this pilot study of 11 pancreatic specimens, 8 of the type 2 diabetic pancreas and 3 of the non-diabetic pancreas, we show that 110±70 nm average diameter TiO2 crystals abound in the type 2 diabetic pancreas, but not in the non-diabetic pancreas...
May 24, 2018: Chemical Research in Toxicology
Jin-Le Hou, Peng Huo, Zheng-Zhen Tang, Li-Na Cui, Qin-Yu Zhu, Jie Dai
The use of multiple sensitizers in dye sensitized solar cells has been attractive as a promising way to achieve highly efficient photovoltaic performance. However, except for the complementary absorption, synergistic effects among the dye components have not been well understood. Herein, using ferrocene-1-carboxylate (FcCO2 ) and catechol (Cat) as dye ligands, two titanium oxo clusters (TOCs), [Ti3 O(Oi Pr)6 (Cat)(FcCO2 )2 ] (1) and [Ti7 O4 (Oi Pr)8 (Cat)5 (FcCO2 )2 ] (2), were synthesized and structurally characterized...
May 24, 2018: Inorganic Chemistry
Gema Cabello, Rogério A Davoglio, Luis G Cuadrado
Herein, we report a detailed study of microwave-matter interaction focused on the role of small nanoparticles and the effects on microwave thermal heating. We have used a model reaction (degradation of methylene blue) to study the influence of temperature, size, and catalytic properties of the nanoparticles in the potential formation of hot spots. Total mineralization was achieved after 3 h microwave heating at 200 °C in the presence of 2 nm TiO2 nanoparticles (92% calculated TOC decay), but the reaction resulted in a mixture of intermediates (52% TOC decay) in the absence of TiO2 ...
May 24, 2018: Inorganic Chemistry
X Dai, R Liu, N Li, J Yi
AIM: Concerns about the possible toxicity to environment and human health of titanium dioxide nanoparticles (TiO2 NPs) are increasing. The aim of this study was to investigate the relationship between toxicology and autophage in vitro. METHODS: RAW 264.7 cells were exposed to five concentrations (50, 100, 200, 300, and 400 μg/mL) and two particle size of TiO2 NPs (30 and 100 nm) for 24 h. RESULTS: The results showed that TiO2 NPs decreased cell viability, phagocytic rate, and phagocytic index in a concentration-dependent manner, thereby inducing autophagy...
January 1, 2018: Human & Experimental Toxicology
Conghui Yuan, Tong Wu, Jie Mao, Ting Chen, Yuntong Li, Min Li, Yiting Xu, Birong Zeng, Weiang Luo, Lingke Yu, Gaofeng Zheng, Lizong Dai
Core-shell structures are of particular interest in the development of advanced composite materials as they can efficiently bring different components together at nanoscale. The advantage of this structure greatly relies on the crucial design of both core and shell, thus achieving an inter-component synergistic effect. In this report, we show that decorating semiconductor nanocrystals with a boronate polymer shell can easily achieve programmable core-shell interactions. Taking ZnO and anatase TiO2 nanocrystals as inner core examples, the effective core-shell interactions can narrow the band gap of semiconductor nanocrystals, change the HOMO and LUMO levels of boronate polymer shell and significantly improve the carrier density of core-shell particles...
May 24, 2018: Journal of the American Chemical Society
Markus Kratzer, Konrad Szajna, Domink Wrana, Wojciech Belza, Franciszek Krok, Christian Teichert
Control over organic thin film growth is a central issue in the development of organic electronics. The anisotropy and extended size of the molecular building blocks introduce a high degree of complexity within the formation of thin films. This complexity can be even increased for substrates with induced, sophisticated morphology and anisotropy. Thus, targeted structuring like ion beam mediated modification of substrates in order to create ripples, pyramids, or pit structures provides a further degree of freedom in manipulating the growth morphology of organic thin films...
May 23, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Stefan Schünemann, Maurice van Gastel, Harun Tüysüz
Halide perovskites have attracted great attention in the fields of photovoltaics, LEDs, lasers, and most recently photocatalysis due to their unique optoelectronic properties. Here, we present an all-inorganic halide perovskites CsPbBr3/TiO2 composite material for the selective benzyl alcohol oxidation to benzaldehyde under visible light illumination. The catalyst, which is prepared via a facile wet-impregnation method, shows very good selectivities towards benzaldehyde (90 % at 50 % conversion). Action spectra and electron spin resonance (ESR) studies reveal that photo-excited electrons formed within the CsPbBr3 upon visible light illumination take part in the reaction via the reduction of oxygen to form superoxide radicals...
May 23, 2018: ChemSusChem
Shiyuan Gao, Bin Wang, Xinyu Liu, Zhanhu Guo, Zhongqing Liu, Yichao Wang
Amorphous molybdenum sulfides (a-MoSx) have been demonstrated as economic and efficient hydrogen evolution catalysts for water splitting. Further improvements of their hydrogen evolution reaction (HER) activities could be achieved by coupling them with appropriate electron transfer intermediates via interfacial engineering. In this study, a novel ternary composite electrode comprising PbTe quantum dots (QDs), a-MoSx and TiO2 nanotube arrays (TNAs) was successfully fabricated by a facile combination of successive ionic layer adsorption and reaction (SILAR) and electrodeposition routes...
May 23, 2018: Nanoscale
Liangliang Liu, Chongyang Li, Man Jiang, Xiaodong Li, Xiaowei Huang, Zhu Wang, Yu Jia
First principles calculations were performed to cast insight into the mechanism of the improvement of O2 reduction reaction (ORR) activity by Zn and H interstitials on the anatase TiO2 (101) surface. For the Zn-modified anatase TiO2 (101) surface, both surface and subsurface Zn interstitials could contribute to O2 adsorption and dissociation, but the dissociation barriers of O2 molecules are still too high, which limits the ORR activity. After a H adatom is introduced onto the Zn-modified anatase TiO2 (101) surface, the highest energy barriers are greatly reduced compared with those of the Zn-modified surface...
May 23, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Chunjun Chen, Tianbin Wu, Dexin Yang, Pei Zhang, Huizhen Liu, Youdi Yang, Guanying Yang, Buxing Han
Novel porous TiO2@Cu3(BTC)2 composites, which were synthesized using ionic liquids (ILs) as solvents, exhibited excellent activity for photooxidation of styrene to 4-aryl tetralones and promoting the Glaser coupling reaction with O2 under light irradiation. It was discovered that the transformation between Cu2+ and Cu+ was crucial for enhancing the photocatalytic performance.
May 23, 2018: Chemical Communications: Chem Comm
Feyza Dundar Arisoy, Kristopher W Kolewe, Benjamin Homyak, Irene S Kurtz, Jessica D Schiffman, James J Watkins
By combining antifouling shark skin patterns with antibacterial titanium dioxide (TiO2) nanoparticles (NPs), we present a simple route towards producing durable multifunctional surfaces that decrease microbial attachment and inactivate attached microorganisms. Norland Optical Adhesive (NOA), a UV-crosslinkable adhesive material was loaded with 0, 10, or 50 wt% TiO2 NPs from which shark skin microstructures were imprinted using solvent-assisted soft nanoimprint lithography on a polyethylene terephthalate (PET) substrate...
May 23, 2018: ACS Applied Materials & Interfaces
Ying Jiang, Shi Chen, Daobin Mu, Zhikun Zhao, Chunli Li, Zepeng Ding, Chaoxiang Xie, Feng Wu
Flexible TiO2/SiO2/C films are prepared via an electrospinning approach and used as self-supporting electrodes for LIBs, which exhibits excellent high-rate capability with a capacity of 115.5 mA h g-1 at 8 A g-1 (9.8 C rate) and good storage performance. It also shows great long-term cycle of 700 cycles at 200 mA g-1 with a capacity of 380.1 mA h g-1 and a high capacity retention of 88.3%s. Thus, it has the potential as electrodes for flexible LIBs owing to its flexibility and excellent electrochemical performance...
May 22, 2018: ChemSusChem
Anny Leudjo Taka, Elvis Fosso-Kankeu, Kriveshini Pillay, Xavier Yangkou Mbianda
In this study, an insoluble nanosponge biopolymer composite was synthesized, using a combined process of amidation reaction, cross-linking polymerization, and sol-gel method to obtain a phosphorylated multiwalled carbon nanotube-cyclodextrin/silver-doped titania (pMWCNT-βCD/TiO2 -Ag). This work mainly emphasized on the removal of lead (Pb2+ ) and cobalt (Co2+ ) metal ions from synthetic and real wastewater samples using the synthesized pMWCNT-βCD/TiO2 -Ag as a biosorbent. The new material was characterized by Fourier transform infrared (FTIR) spectroscopy, zeta potential, Brunauer-Emmett-Teller (BET) method, and scanning electron microscopy (SEM)...
May 23, 2018: Environmental Science and Pollution Research International
Libin Yang, Qinqin Sang, Juan Du, Ming Yang, Xiuling Li, Yu Shen, Xiaoxia Han, Xin Jiang, Bing Zhao
Ag simultaneously deposited and doped TiO2 (Ag-TiO2) hybrid nanoparticles (NPs) were prepared via a sol-hydrothermal method, as both a sensitive surface-enhanced Raman scattering (SERS) substrate and a superior photocatalyst for the first time. Ag-TiO2 hybrid NPs exhibit excellent SERS performance for several probe molecules and the enhancement factor is calculated to be 1.86 × 105. The detection limit of the 4-mercaptobenzoic acid (4-MBA) probe on the Ag-TiO2 substrate is 1 × 10-9 mol L-1, which is four orders of magnitude lower than that on pure TiO2 as a consequence of the synergistic effects of TiO2 and Ag...
May 23, 2018: Physical Chemistry Chemical Physics: PCCP
Jingyu Jin, Xiaoyan Li, Jiafeng Geng, Dengwei Jing
Combinations of nanoparticles and surfactants have been widely employed in many industrial processes, i.e., boiling and condensation in heat transfer and hydraulic fracturing in shale oil and gas production, etc. However, the underlying mechanism for various phenomena resulting from the addition of nanoparticles into the surfactant solutions is still unclear. For instance, there are contradictory conclusions from the literature regarding the variations of surface tension upon the addition of nanoparticles into surfactant solutions...
May 23, 2018: Physical Chemistry Chemical Physics: PCCP
Kazuya Imamura, Hiroko Kato, Yuichiro Wada, Kazuhiro Makabe, Ayumu Onda, Atsuhiro Tanaka, Hiroshi Kominami, Katsutoshi Sato, Katsutoshi Nagaoka
In the presence of a palladium-loaded TiO2 photocatalyst, the cleavage of benzyl phenyl ether in low-molecular-weight alcohol solvents under de-aerated conditions afforded toluene and phenol simultaneously in a 1 : 1 molar ratio.
May 23, 2018: Chemical Communications: Chem Comm
Amir Asghari, Mahmoud Hosseini, Farimah Beheshti, Mohammad Naser Shafei, Soghra Mehri
INTRODUCTION: An interaction between oxidative stress, neuroinflammation and nitric oxide (NO) has been suggested to have a role neurotoxicity. The aim of current research was to investigate the effect of aminoguanidine (AG) as an inducible NO synthase (iNOS) inhibitor, on brain-derived neurotrophic factor (BDNF), oxidative stress and interleukin-6 (IL-6) concentrations in the brain tissues of neonates born from the rats exposed to titanium dioxide nanoparticles (TiO2 NPs) during gestation was...
May 22, 2018: Journal of Maternal-fetal & Neonatal Medicine
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