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Tio2 Nanotubes

Qiong Yuan, Lei He, Zhong-Ji Qian, Chunxia Zhou, Pengzhi Hong, Zhe Wang, Yi Wang, Shengli Sun, Chengyong Li
Microstructure of hydroxyapatite is known to influence cellular behavior, can be performed as a substrate for osteoblast growth, and exploited as a drug release platform. However, easy delamination and self-decomposition of hydroxyapatite caused by poor adhesion with substrates are the main problems currently. In this paper, we successfully fabricated TiO2/SrHA composite scaffolds by self-generated strontium substituted hydroxyapatite microspheres in TiO2 nanotubes. Moreover, the active compound 1-(5-bromo-2-hydroxy-methoxyphenyl)-ethanone (BHM) from Seahorse (Hippocampus kuda Bleeler) was loaded in this scaffold, and the controlled release kinetics of BHM was studied...
August 16, 2018: ACS Applied Materials & Interfaces
Kefeng Wang, Qi Chen, Yingyan Hu, Wei Wei, Songzhu Wang, Qi Shen, Peng Qu
Nowadays, the state-of-the-art electrocatalysts for hydrogen evolution reaction (HER) are platinum group metals. Nonetheless, Pt-based catalysts show decreased HER activity in alkaline media compared with that in acidic media due to the sluggish dissociation process of H2 O on the surface of Pt. With a cost 1/25 that of Pt, Ru demonstrates a favorable dissociation kinetics of absorbed H2 O. Herein, crystalline Ru0.33 Se nanoparticles are decorated onto TiO2 nanotube arrays (TNAs) to fabricate Ru0.33 Se @ TNA hybrid for HER...
August 14, 2018: Small
Hong Li, Yanhui Li, Meng Wang, Zhen Niu, Xiutong Wang, Baorong Hou
For improving the photocathodic protection performance of TiO2 photoanode, ZnIn2S4/reduced graphene oxide (RGO)/TiO2 nanotubes (NTs) composite was synthesized by electrochemical anodizing combined with hydrothermal method. The photoelectrochemical and photocathodic protection properties of the ZnIn2S4/RGO/TiO2 composite were investigated in detail. Compared with pure TiO2 NTs, the ZnIn2S4/RGO/TiO2 composite showed a significant improvement in photocathodic protection performances. The photogenerated open circuit potential (OCP) drop of ZnIn2S4/RGO/TiO2 coupled with Q235 carbon steel (CS) in 3...
August 14, 2018: Nanotechnology
Zhang Yuan, Peng Liu, Yansha Hao, Yao Ding, Kaiyong Cai
In orthopedic fields, effective anti-infection property and promotive biocompatibility on surface of titanium implants are two crucial factors for long-term successful implants. Herein, Ag nanoparticles (NPs) loaded TiO2 nanotubes (TNT) arrays were fabricated on Ti substrates with assistance of ultraviolet irradiation. Then, bioactive multilayer films of chitosan (CHI) and dialdehyde alginate (ADA) pair were deposited onto the Ag-loaded TNT arrays via a layer-by-layer (LBL) self-assembly technique, which could effectively achieve the impactful antibacterial ability of titanium and endow the substrates with favorable biocompatibility...
July 29, 2018: Colloids and Surfaces. B, Biointerfaces
Bekir Çakıroğlu, Mahmut Özacar
In this study, a photoelectrochemical (PEC) biosensor was constructed by depositing supercapacitor carbon nanotubes (CNT) and Co3 O4 onto the anatase TiO2 coated ITO electrodes. Herein, supercapacitor Co3 O4 was employed as a semiconductor with a band gap of ~2.07 eV, and the supercapacitor behavior of the PEC system was improved by introducing CNT into the electrode material. Furthermore, a self-empowering glucose biosensor operating at 0 V was constructed for the first time. Also, upon the formation of p-n junction, Co3 O4 was rendered electron accepting material, unlike its usual use in photocatalytic systems...
July 27, 2018: Biosensors & Bioelectronics
Lenore Kubie, Kevin J Watkins, Rachelle Ihly, Henry V Wladkowski, Jeffrey L Blackburn, William Douglas Rice, Bruce A Parkinson
Semiconducting single-walled carbon nanotubes' (SWCNTs) broad absorption range and all-carbon composition make them attractive materials for light harvesting. While several studies have utilized interfaces with organic electron donors/acceptors to dissociate strongly bound SWCNT excitons, much less attention has been given to exciton dissociation across interfaces with well-characterized inorganic semiconductors. We report photoinduced charge transfer from both multi-chiral and single-chirality SWCNT films into atomically-flat SnO2 and TiO2 crystals...
August 7, 2018: Journal of Physical Chemistry Letters
Yulong Liao, Botao Yuan, Dainan Zhang, Jin Zhang, Xiaoyi Wang, Peng Deng, Kaibin Zhang, Huaiwu Zhang, Quanjun Xiang, Zhiyong Zhong
Heterostructured TiO2 materials are of great importance in electronic and photochemical related applications. We report herein a simple, low-cost, and scalable fabrication of metal oxides heterostructured TiO2 nanotube arrays (NTAs) through a combined strategy of thermal decomposition and crystallization. Various M x O y /TiO2 heterostructured films (M = Zn, Ce, Cu, Cr...) were obtained by using TiO2 NTAs as "nano-containers" as well as "nano-reactors", while using M(CH3 COO) x solutions as the precursors...
August 3, 2018: Inorganic Chemistry
M Türkay Aytekin Aydın, H Levent Hoşgün, Alper Dede, Kıymet Güven
One-dimensional titanium dioxide (TiO2 ) nanotubes (TNTs) doped with silver (Ag) (% 5) were synthesized via two-step hydrothermal method. These nanotubes were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The impact of Ag-doped TiO2 nanotubes as antibacterial agents against three strains of Gram positive Staphylococcus aureus and a strain of Gram negative Escherichia coli was also investigated...
July 25, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
M Vračko, S C Basak, F Witzmann
Applications of nanomaterials in biomedical, industrial, and consumer goods areas are expanding rapidly because of their unique physicochemical properties. Hazard assessment of nanosubstances is necessary for the protection of human and ecological health. We studied the proteomics patterns of three cell lines: co-culture of Caco-2 and HT29-MTX cells, primary small airway epithelial cells, and THP-1macrophage-like cells. The cells were exposed at 10 μg and 100 μg concentrations for 3 and 24 hours to multi-walled carbon nanotubes and TiO2 nanobelts (TiO2 -NB)...
July 27, 2018: SAR and QSAR in Environmental Research
Tilen Koklic, Iztok Urbančič, Irena Zdovc, Majda Golob, Polona Umek, Zoran Arsov, Goran Dražić, Štefan Pintarič, Martin Dobeic, Janez Štrancar
Bacterial infections acquired in healthcare facilities including hospitals, the so called healthcare acquired or nosocomial infections, are still of great concern worldwide and represent a significant economical burden. One of the major causes of morbidity is infection with Methicillin Resistant Staphylococcus aureus (MRSA), which has been reported to survive on surfaces for several months. Bactericidal activity of copper-TiO2 thin films, which release copper ions and are deposited on glass surfaces and heated to high temperatures, is well known even when illuminated with very weak UVA light of about 10 μW/cm2...
2018: PloS One
Mohamad Mohsen Momeni, Yousef Ghayeb, Negin Moosavi
Iron-doped TiO2 nanotubes (Fe-TNTs) were prepared by a one step anodization method. Nickel-platinum was then deposited on the surface of these Fe-TNTs samples by an electroless process during different time periods. SEM, XRD and UV-vis absorption spectroscopy was used to study the surface morphologies, composition and optical properties of the synthetic samples. In addition, the impact of coupling the samples prepared with 403 stainless steel on the corrosion of metal under illumination was studied. The corrosion behavior was studied by electrochemical techniques (choronoamperometery, open circuit potential and Tafel)...
July 26, 2018: Nanotechnology
Yulong Liao, Peng Deng, Xiaoyi Wang, Dainan Zhang, Faming Li, Qinghui Yang, Huaiwu Zhang, Zhiyong Zhong
Based on highly ordered TiO2 nanotube arrays (NTAs), we successfully fabricated the Cu2 O-TiO2 NTA heterojunction by a simple thermal decomposition process for the first time. The anodic TiO2 NTAs were functioned as both "nano-container" and "nano-reactors" to load and synthesize the narrow band Cu2 O nanoparticles. The loaded Cu2 O expanded absorption spectrum of the TiO2 NTAs from ultraviolent range to visible light range. We found that the Cu2 O-TiO2 NTA heterojunction films had visible activity towards photocatalytic degrading methyl orange (MO)...
July 24, 2018: Nanoscale Research Letters
Zhi Geng, Zhiting Chen, Zhaoyang Li, Xin Qi, Xia Yang, Wei Fan, Yingna Guo, Leilei Zhang, Mingxin Huo
TiO2 nanotubes (TNTs) and AgCl/TiO2 nanotubes (AgCl/TNTs) were synthesized by a hydrothermal method and used in the reduction of nitrate with formic acid as a hole scavenger. As-synthesized photocatalysts were well characterized by field emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), X-ray photoelectron spectra (XPS), N2 adsorption-desorption and UV-vis diffuse reflectance spectroscopy (UV-vis DRS). 5 wt% AgCl/TNTs showed excellent performance in the reduction of nitrate (94...
July 24, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Urvashi Fowdar Gunputh, Huirong Le, Richard D Handy, Christopher Tredwin
Medical grade titanium alloy is widely used for bone/dental implants, but the material alone has no innate antimicrobial properties that would reduce infection risk following surgery. However, silver nanoparticles (Ag NPs) are known to be antibacterial. This study investigated the growth of Ag NPs on titanium dioxide nanotubes (TiO2 NTs) on Ti-6Al-4V discs. The TiO2 NTs were grown on the Ti alloy using an electrochemical method, and then decorated with Ag NPs. The Ag NPs were synthesised by chemical reduction using δ-gluconolactone...
October 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
J Vassallo, A Besinis, R Boden, R D Handy
There are now over a thousand nano-containing products on the market and the antibacterial properties of some nanomaterials has created interest in their use as cleaning agents, biocides and disinfectants. Engineered nanomaterials (ENMs) are being released into the environment and this raises concerns about their effects on microbes in the receiving ecosystems. This study evaluated the bacterial toxicity of a wide range of nanomaterials with different surface coatings on Escherichia coli K-12 MG1655. The minimum inhibitory concentration (MIC) assay, which quantifies the threshold for growth inhibition in suspensions of bacteria, was used to rank the toxicity of silver (Ag), cupric oxide (CuO), cadmium telluride (CdTe) quantum dots, titanium dioxide (TiO2 ), nanodiamonds and multi-walled carbon nanotubes (MWCNTs)...
October 30, 2018: Ecotoxicology and Environmental Safety
Maryam Zare, Shahram Solaymani, Azizollah Shafiekhani, Slawomir Kulesza, Ştefan Ţălu, Miroslaw Bramowicz
Nowadays, increasing awareness of environment and fossil fuels protection stimulates intensive research on clean and renewable sources of energy. Production of hydrogen from water through solar-driven splitting reactions is one of the most promising approaches in the field of photoelectrochemistry (PEC). In this work we have fabricated well-aligned, highly-ordered, smooth-mouth TiO2 nanotube arrays (TNAs) in a two-step anodization process of titanium foil, which were then used as photoelectrodes for PEC water splitting...
July 18, 2018: Scientific Reports
Xiyu Ding, Yanmei Zhang, Jinyan Ling, Changjian Lin
Mussel-inspired deposition of polydopamine (PDA) is a green chemical method that has been used to load silver nanoparticles on titanium oxide nanotubes (TiO2 NTs) to kill bacteria. However, a long reaction time is required for both the polymerization of dopamine and the reaction between PDA and silver nitrate. In addition, the deposition of silver nanoparticles is difficult to control, which may increase the risk of cytotoxicity. In this study, a rapid polymerization of dopamine was achieved by performing the reaction in a water bath at 90 °C (PDA-H)...
July 9, 2018: Colloids and Surfaces. B, Biointerfaces
Seunghyun Weon, Eunji Choi, Hyejin Kim, Jee Yeon Kim, Hee-Jin Park, Sae-Mi Kim, Wooyul Kim, Wonyong Choi
TiO2 nanotubes (TNT) have a highly ordered open structure that promotes the diffusion of dioxygen and substrates onto active sites and exhibit high durability against deactivation during the photocatalytic air purification. Herein, we synthesized {001} facet-exposed TiO2 nanotubes (001-TNT) using a new and simple method that can be easily scaled up, and tested them for the photocatalytic removal of volatile organic compounds (VOCs) in both a laboratory reactor and a commercial air cleaner. While the surface of TNT is mainly composed of {101} facet anatase, 001-TNT's outer surface was preferentially aligned with {001} facet anatase...
July 31, 2018: Environmental Science & Technology
André L R Rangel, Javier A M Chaves, Ana L A Escada, Reginaldo T Konatu, Ketul C Popat, Ana P Rosifini Alves Claro
In this study, ordered and uniform TiO2 nanotubular structures were obtained on the surface of the Ti15Mo alloy by anodic oxidation. The amorphous state of TiO2 nanotubes formed under different anodization conditions was investigated. Crystallization of TiO2 into anatase phase occurs during annealing at temperatures of around 400°C, whereas anatase to rutile transformation starts around 500°C and is completed at 800°C. Phase transformations in annealed samples led to morphological changes of tubular nanostructures, suggesting that the oxide layer formed at the nanotube/substrate interface serves as nucleation sites for more stable phases of TiO2 ...
July 1, 2018: Journal of Applied Biomaterials & Functional Materials
Kalyan C Goddeti, Hyosun Lee, Beomjoon Jeon, Jeong Young Park
A novel three-dimensional catalytic nanodiode composed of a Pt thin film on TiO2 nanotubes was designed for the efficient detection of the flux of hot electrons, or chemicurrent, under hydrogen oxidation. We verify a significant increase in the chemicurrent from the fast transport of electrons across the ordered supporting oxide layer. This study demonstrates the direct detection of hot electrons on well-ordered TiO2 nanotubes during the catalytic reaction.
July 10, 2018: Chemical Communications: Chem Comm
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