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Blue TiO2

Xianbin Zhang, Hanna Tiainen, Håvard J Haugen
TiO2 scaffolds have previously shown to have promising osteoconductive properties in previous in vivo experiments. Appropriate mechanical stimuli can further promote this osteoconductive behaviour. However, the complex mechanical environment and the mechanical stimuli enhancing bone regeneration for porous bioceramics have not yet been fully elucidated. This paper aims to compare and evaluate mechanical environment of TiO2 scaffold with three commercial CaP biomaterials, i.e. Bio-Oss, Cerabone and Maxresorb under simulated perfusion culture conditions...
August 16, 2018: Medical & Biological Engineering & Computing
Chentao Hou, Wenli Liu
TiO2 /TiOF2 nanohybrids were quickly synthesized through a hydrothermal process using titanium n-butoxide (TBOT), ethanol (C2 H5 OH) and hydrofluoric acid as precursors. The prepared nanohybrids underwent additional NaOH treatment (OH-TiO2 /TiOF2 ) to enhance their photocatalytic performance. In this paper, the mechanism of NaOH affecting the pathway of transformation from TBOT (Ti precursor) to TiO2 nanosheets was discussed. The synthesized TiO2 /TiOF2 and OH-TiO2 /TiOF2 were characterized by field emission scanning electron microscopy (FE-SEM), high-resolution transmission electron microscopy (HRTEM), X-ray diffraction pattern (XRD), Fourier infrared spectroscopic analysis (FT-IR), Photoluminescence (PL) emission spectra and UV-visible diffuse reflection spectra (UV-vis DRS)...
June 2018: Royal Society Open Science
Hisayuki Nakatani, Ryousuke Hamachi, Kenta Fukui, Suguru Motokucho
A polymer photocatalyst system was synthesized using a poly(styrene-block-acrylic acid) (PS-b-PAA) containing TiO2 gel without calcination, and its activity characteristics were assessed with methylene blue (MB) photodegradation test in water under visible light irradiation. The initial photodegradation activity was controllable by the polymer chain length and PAA/PS molar ratio. The longer polymer chain length provoked the activity decrease by macromolecular crowding effect. The lower molar ratio did an increase in the photocatalytic surface area by generation of a large number of anatase TiO2 crystal nuclei, leading to the activity increase...
July 31, 2018: Journal of Colloid and Interface Science
Subramaniyan Ramasundaram, Mingizem Gashaw Seid, Hyung-Eun Kim, Aseom Son, Changha Lee, Eun-Ju Kim, Seok Won Hong
An immobilized photocatalyst was prepared by thermally treating TiO2 -coated steel mesh (TiO2 -IS) in a laboratory hot-press with no binder. TiO2 coating was performed by electrospraying a 1 mg/mL methanol dispersion of Evonik P25 powder. The thermal treatment conditions at 350 °C, 100 Mpa, and 1 h were found to be the optimum conditions. Scanning electron microscopic images displayed a robust and adherent TiO2 layer on steel mesh. X-ray photoelectron spectroscopy and elemental mapping studies confirmed that the Fe3 O4 interface formed during thermal treatment strongly bound the TiO2 on steel mesh...
July 26, 2018: Journal of Hazardous Materials
Yuan Yao, Mingxuan Sun, Xiaojiao Yuan, Yuanhua Zhu, Xiaojing Lin, Sambandam Anandan
N/Ti3+ co-doping multiphasic TiO2 /BiOBr heterojunctions (NT-TBx) were prepared by one-step in situ hydrothermal processes. The crystal phase, morphology, component, and optical properties of the heterojunctions were characterized by X-ray diffraction, scanning electron microscope, transmission electron microscope, X-ray photoelectron spectroscopy, and Ultraviolet-visible diffuse reflectance spectroscopy techniques, respectively. The as-prepared samples exhibit better sonocatalytic activity for the degradation methylene blue, Rhodamine B, and p-Nitrophenol aqueous solution compared with pristine TiO2 and N/Ti3+ co-doping multiphasic TiO2 ...
July 19, 2018: Ultrasonics Sonochemistry
Evangelia Vasilaki, Maria Vamvakaki, Nikos Katsarakis
ZnO-TiO2 core-shell photocatalysts of a complex flower-like architecture were synthesized, using a well-controlled sol-gel coating reaction of presynthesized ZnO flower-like structures. The samples were characterized by X-ray diffraction, field emission scanning and transmission electron microscopy, energy-dispersive X-ray spectroscopy, diffuse reflectance UV-vis and attenuated total reflectance-Fourier transform infrared spectroscopy, nitrogen adsorption-desorption measurements, and photoluminescence measurements...
August 7, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Bruna de Paula Soares, Leticia Rosa Climaco, Lariana Negrão Beraldo de Almeida, Giane Gonçalves Lenzi
The present work aimed at evaluating the photocatalytic process as an alternative for color removal from a synthetic solution (methylene blue dye) and of a sample of textile effluent, obtained from the various stages of the process, mainly dyeing. The parameters were evaluated using titanium dioxide (anatase, rutile, commercial and synthetized by the sol-gel method) in order to determine their structural influence in the discoloration of the samples. A synthetic methylene blue dye solution and a real effluent (Brazilian textile industry) were treated...
July 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Zewu Zhang, Yuhang Ma, Xiaohai Bu, Qiong Wu, Zusheng Hang, Zhao Dong, Xiaohan Wu
Novel TiO2 /Ag/SnO2 composites were successfully prepared by a facile one-step reduction approach using stannous chloride as both SnO2 precursor and reducing agent. The Ag nanoparticles with sizes of 2.04-3.94 nm were located on TiO2 matrix and immobilized by the surrounded SnO2 . The resulted TiO2 /Ag/SnO2 nanocomposites were used as photocatalyst for photodegradation of methylene blue under visible light. The experimental results demonstrated that the visible light photocatalytic activity of the TiO2 /Ag/SnO2 was significantly enhanced in comparison with the individual TiO2 or the binary composite (TiO2 /Ag or TiO2 /SnO2 ) and the degradation rate was up to about 9...
July 12, 2018: Scientific Reports
Étude O'Neel-Judy, Dylan Nicholls, John Castañeda, John G Gibbs
Using a dynamic fabrication process, hybrid, photoactivated microswimmers made from two different semiconductors, titanium dioxide (TiO2 ) and cuprous oxide (Cu2 O) are developed, where each material occupies a distinct portion of the multiconstituent particles. Structured light-activated microswimmers made from only TiO2 or Cu2 O are observed to be driven in hydrogen peroxide and water most vigorously under UV or blue light, respectively, whereas hybrid structures made from both of these materials exhibit wavelength-dependent modes of motion due to the disparate responses of each photocatalyst...
July 11, 2018: Small
Duo Pan, Shengsong Ge, Junkai Zhao, Qian Shao, Lin Guo, Xincheng Zhang, Jing Lin, Gaofeng Xu, Zhanhu Guo
Ternary NiCoFe mixed-metal oxides (NCF-MMOs) with different Ni/Co/Fe ratios were successfully synthesized through a hydrotalcite-like precursor route by co-precipitation of appropriate amounts of metal salts from homogeneous solution, followed by calcination at 600 °C. X-ray diffraction (XRD) patterns revealed the formation of well crystalline layered double hydroxides (LDHs), particularly at the M2+/M3+ ratio of 3 : 1. Brunauer-Emmett-Teller (BET) analysis revealed that the resulting NiCoFe LDHs possessed large specific surface areas (66...
July 24, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Meng Dang, Qi-Liang Deng, Guo-Zhen Fang, Dong-Dong Zhang, Hai-Jie Li, Jing-Min Liu, Shuo Wang
Herein, novel bifunctional smart films containing poly(styrene-butyl acrylate-ionic liquids) (P(S-BA-ILs)) and TiO2 were first prepared by a simple cast method and then used to demonstrate a superior bifunction of adsorption/desorption for dyes due to the property of reversible wettability switching and photodegradation under ultraviolet (UV) irradiation due to the addition of TiO2 . The glass transition temperature (Tg) of P(S-BA-ILs) latex was characterized using a differential scanning calorimeter (DSC)...
June 30, 2018: Journal of Colloid and Interface Science
Yuanzuo Li, Chaofan Sun, Peng Song, Fengcai Ma, Nawee Kungwan, Mengtao Sun
Two series of novel dyes were designed based on the multipolar structures of the red dye D35 and blue dye DB, by introducing the furan (F), benzene ring (B) and benzo[c]thiophene (BT) groups into the conjugated bridge of D35 in proper order and adjusting the position of diketopyrrolopyrrole(DPP) unit and the incorporation of fluorine in the conjugated bridge of DB, respectively. We performed the quantum chemistry calculation to investigate the ground state and excited properties in a direct correlation with the spectra properties and abilities of losing or accepting electron for the original and designed molecules...
July 4, 2018: Scientific Reports
Nagat Areid, Ari Peltola, Ilkka Kangasniemi, Ahmed Ballo, Timo O Närhi
This study was designed to investigate the effect of nanostructured TiO2 coatings on human gingival fibroblast and to explore the influence of ultraviolet (UV) light on surface wettability and cellular response. Ti-6Al-4V titanium alloy discs ( n  = 96) were divided into three groups: a sol-gel-derived MetAlive™ (MA) coating; hydrothermal (HT) coating; and a non-coated (NC) group. Forty-eight titanium substrates were further treated with UV light for 15 min. The water contact angles of the substrates were measured using the sessile drop method...
June 2018: Clinical and Experimental Dental Research
Apabrita Mallick, Soumyajit Roy
Visible light propelled nanomotors are a class of highly sought after active matter. Here we report a gold decorated semiconductor and a soft-oxometalate based TiO2-{Mo7}-Au nanomotor which can be propelled diffusiophoretically on exposure to visible light and show excellent photocatalytic activity. These systems exclude the use of any harsh toxic chemical as fuel and exhibit a speed of 10 μm s-1 in water. Their motion can also be controlled by rapid switching of light. We use these photocatalytic nanomotors for environmental cleansing as they can facilitate the removal of organic pollutants from water under visible light...
July 9, 2018: Nanoscale
Siew Yee Lim, Cheryl Suwen Law, Marijana Markovic, Jason K Kirby, Andrew D Abell, Abel Santos
In this study, we explore for the first time the capabilities of nanoporous anodic alumina gradient-index filters (NAA-GIFs) functionalized with titanium dioxide (TiO2 ) photoactive layers to enhance photon-to-electron conversion rates and improve the efficiency of photocatalytic reactions by "slow photon" effect. A set of NAA-GIFs was fabricated by sinusoidal pulse anodization, in which a systematic modification of various anodization parameters (i.e., pore widening time, anodization period, and anodization time) enables the fine-tuning of the photonic stopband (PSB) of these nanoporous photonic crystals (PCs) across the spectral regions...
July 18, 2018: ACS Applied Materials & Interfaces
Hyuncheol Kim, Minsun Kim, Wooyul Kim, Wanno Lee, Soonhyun Kim
After the Fukushima nuclear accident, tremendous efforts were made to treat radiocesium, radiostrontium, and other radioactive materials. For the first time, we demonstrate that a TiO2 photocatalyst can significantly enhance Cs adsorption by Prussian blue-deposited TiO2 (PB/TiO2 ) under UV irradiation. In this study, we synthesized PB/TiO2 using the photodeposition method. After the Cs ions were adsorbed on the PB/TiO2 in darkness, we then exposed the PB/TiO2 to UV light irradiation. This resulted in a further increase in Cs ion adsorption of more than 10 times the amount adsorbed in darkness...
September 5, 2018: Journal of Hazardous Materials
Sa Xiao, Yi Lu, Xin Li, Bing-Yu Xiao, Liang Wu, Jian-Ping Song, Yu-Xuan Xiao, Si-Ming Wu, Jie Hu, Yong Wang, Gang-Gang Chang, Ge Tian, Silvia Lenaerts, Christoph Janiak, Xiao-Yu Yang, Bao-Lian Su
Hierarchically dual-mesoporous TiO2 microspheres have been synthesized via a solvothermal process in the presence of 1-butyl-3-methylmidazolium tetrafluoroborate ([BMIm][BF4]) and diethylenetriamine (DETA) as co-templates. Secondary mesostructured defects in the hierarchical TiO2 microspheres produce the oxygen vacancies, which not only significantly enhance the photocatalytic activity on degrading methyl blue (over 1.7 times to P25) and acetone (over 2.9 times of P25), but which also are beneficial for lithium storage...
June 21, 2018: Chemistry: a European Journal
Amir Ghasemi, Navid Rabiee, Sepideh Ahmadi, Shabnam Hashemzadeh, Farshad Lolasi, Mahnaz Bozorgomid, Alireza Kalbasi, Behzad Nasseri, Amin Shiralizadeh Dezfuli, Amir Reza Aref, Mahdi Karimi, Michael R Hamblin
Colloidal inorganic nanoparticles have wide applications in the detection of analytes and in biological assays. A large number of these assays rely on the ability of gold nanoparticles (AuNPs, in the 20 nm diameter size range) to undergo a color change from red to blue upon aggregation. AuNP assays can be based on cross-linking, non-cross linking or unmodified charge-based aggregation. Nucleic acid-based probes, monoclonal antibodies, and molecular-affinity agents can be attached by covalent or non-covalent means...
July 21, 2018: Analyst
Rini Ravindranath, Arun Prakash Periasamy, Prathik Roy, Yu-Wen Chen, Huan-Tsung Chang
We have devised a unique strategy for highly sensitive, selective, and colorimetric detection of mercury based on analyte-induced enhancement of the photocatalytic activity of TiO2 -Au nanospheres (TiO2 -Au NSs) toward degradation of methylene blue (MB). Through electrostatic interactions, Au nanoparticles are attached to poly-(sodium 4-styreneulfonate)/poly(diallyldimethylammonium chloride) modified TiO2 nanoparticles, which then form an Au shell on each TiO2 core through reduction of Au3+ with ascorbic acid...
July 2018: Analytical and Bioanalytical Chemistry
Henry Agbe, Nadeem Raza, David Dodoo-Arhin, Aditya Chauhan, Ramachandran Vasant Kumar
Ag3 PO4 photocatalyst has attracted interest of the scientific community in recent times due to its reported high efficiency for water oxidation and dye degradation. However, Ag3 PO4 photo-corrodes if electron accepter such as AgNO3 is not used as scavenger. Synthesis of efficient Ag3 PO4 followed by a simple protocol for regeneration of the photocatalyst is therefore a prerequisite for practical application. Herein, we present a facile method for the synthesis of a highly efficient Ag3 PO4 , whose photocatalytic efficiency was demonstrated using 3 different organic dyes: Methylene Blue (MB), Methyl orange (MO) and Rhodamine B (RhB) organic dyes for degradation tests...
April 2018: Heliyon
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