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Tio2 Nanotubes

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https://www.readbyqxmd.com/read/30508760/novel-grafted-electrochemical-interface-for-covalent-glucose-oxidase-immobilization-using-reactive-pentafluorophenyl-methacrylate
#1
Margalida Artigues, Sejin Oh, Joan Gilabert-Porres, Jordi Abellà, Salvador Borrós, Sergi Colominas
One of the most important factors for the proper functioning of enzymatic electrochemical biosensors is the enzyme immobilization strategy. In this work, glucose oxidase was covalently immobilized using pentafluorophenyl methacrylate (PFM) by applying two different surface modification techniques (plasma polymerization and plasma-grafting). The grafted surface was specifically designed to covalently anchor enzyme molecules. It was observed using QCM-D measurements the PFM plasma-grafted surfaces were able to retain a higher number of active enzyme molecules than the PFM polymerized surfaces...
November 28, 2018: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/30504044/a-facile-synthesis-of-cs-loaded-tio-2-nanotube-photoelectrode-for-the-removal-of-4-chloroguaiacol
#2
Himadri Rajput, Rahil Changotra, Vikas Kumar Sangal, Sunil Kumar Mahla, Amit Dhir
In this study, novel Cesium (Cs) doped TiO2 nanotubes photoelectrode (Cs/TiO2 NTs) were synthesized by simple electrochemical anodization method and characterized by several physicochemical techniques. In particular, the photocatalytic (PC), electrocatalytic (EC) and photoelectrocatalytic (PEC) activity of newly synthesized Cs/TiO2 NTs electrodes was investigated using 4-Chloroguaiacol (4-CG). The effect of operating parameters like Cs concentration, electrolyte concentration, external current and pH on degradation efficacy was examined...
November 27, 2018: Chemosphere
https://www.readbyqxmd.com/read/30500470/pt-tio-2-nanotube-photocatalyst-effect-of-synthesis-methods-on-valance-state-of-pt-and-its-influence-on-hydrogen-production-and-dye-degradation
#3
Nagappagari Lakshmanareddy, Vempuluru Navakoteswara Rao, Kanakkampalayam Krishnan Cheralathan, Ellappalayam Palanisamy Subramaniam, Muthukonda Venkatakrishnan Shankar
Direct conversion of solar energy into clean fuels is emerging as an efficient way for the future energy generation and solving environmental issues. Especially, photocatalytic splitting of water into H2 under solar light irradiation is one of the best techniques for clean energy production. Also, decomposition of organic pollutants using solar light is an urgent need to protect the environment. Hence, in the present study, we studied Pt-TiO2 nanotubes based composites for H2 generation and methyl orange dye degradation under solar light irradiation and compared the effect of deposition methods namely photo-deposition and chemical reduction methods...
November 20, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/30484456/plasmonic-hot-carrier-driven-oxygen-evolution-reaction-on-au-nanoparticles-tio-2-nanotube-arrays
#4
Song Yi Moon, Hee Chan Song, Eun Heui Gwag, Ievgen I Nedrygailov, Changhwan Lee, Jeong Jin Kim, Won Hui Doh, Jeong Young Park
The use of hot carriers generated from the decay of localized surface plasmon resonance in noble metal nanoparticles is a promising concept for photocatalysis. Here, we report the enhancement of photocatalytic activity by the flow of hot electrons on TiO2 nanotube arrays decorated with 5-30 nm Au nanoparticles as photoanodes for photoelectrochemical water splitting. This enhanced photocatalytic activity is correlated to the size of the Au nanoparticles, where higher oxygen evolution was observed on the smaller nanoparticles...
November 28, 2018: Nanoscale
https://www.readbyqxmd.com/read/30476718/determination-of-the-small-amount-of-proteins-interacting-with-tio-2-nanotubes-by-afm-measurement
#5
Yihui Dong, Xiaoyan Ji, Aatto Laaksonen, Wei Cao, Rong An, Linghong Lu, Xiaohua Lu
Detecting the small amounts of proteins interacting effectively with the solid film electrodes surface still remains a challenge. To address this, in this work, a new approach was proposed by the combination of the adhesion forces and the molecular interaction measured with AFM. Cytochrome c (Cyt C) interacting effectively with TiO2 nanotube arrays (TNAs) was chosen as a probe. The amounts of Cyt C molecules interacting effectively on TNAs surface (CTNA ) range from 5.5×10-12 to 7.0×10-12  mol/cm2 (68.2-86...
November 20, 2018: Biomaterials
https://www.readbyqxmd.com/read/30472544/effective-removal-of-emerging-dissolved-cyanotoxins-from-water-using-hybrid-photocatalytic-composites
#6
Soryong Chae, Tahereh Noeiaghaei, Yoontaek Oh, In S Kim, Jin-Soo Park
Harmful algal blooms are occurring more frequently in fresh water throughout the world. Certain cyanobacteria can produce and release potent toxic compounds, known as cyanotoxins, such as microcystins, cylindrospermopsin, saxitoxin, and anatoxin-a, and as such they have become a human and environmental health concern. Hybrid photocatalytic composites (HPCs) comprising carbon nanotubes on the surface of TiO2 nanotubes were designed in this study. The HPCs have a selective adsorption capacity to cyanotoxins and provide photocatalytic activity to produce reactive oxygen species for the degradation of cyanotoxins...
November 13, 2018: Water Research
https://www.readbyqxmd.com/read/30467766/application-of-central-composite-design-for-the-optimization-of-electrode-surface-composition-for-glucose-biosensor-fabrication
#7
İrem Okman Koçoğlu, Pınar Esra Erden, Adnan Kenar, Esma Kılıç
The use of a central composite design (CCD) for the optimization of electrode surface composition and its application to develop an amperometric glucose biosensor as a model system are described. A five-level three-factorial CCD was applied to determine the optimum electrode surface composition for three critical variables: amounts of carboxylated multiwall carbon nanotubes (c-MWCNT), titanium dioxide nanoparticles (TiO2 NP), and glucose oxidase (GOx). The statistical significance of the model and factors were evaluated using the variance analysis (ANOVA) at 95% of confidence level...
November 22, 2018: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/30453796/the-hierarchical-micro-nanotextured-topographies-promote-the-proliferation-and-angiogenesis-related-genes-expression-in-human-umbilical-vein-endothelial-cells-by-initiation-of-hedgehog-gli1-signaling
#8
Yao Lin, Yiming Shao, Jieyin Li, Wenying Zhang, Kaibin Zheng, Xuying Zheng, Xiaoman Huang, Zipeng Liao, Yirui Xie, Junbing He
The hierarchical microtextured/nanotextured topographies have been recognized to have better tissue integration properties, but the underlying mechanisms are only partially understood. Hedgehog signaling plays a pivotal role in developmental and homeostatic angiogenesis. We suppose that the Hedgehog-Gli1 signaling may play a significant role in the response of endothelial cells to microtextured/nanotextured topographies (MNTs). To confirm this hypothesis, we produced the MNTs decorated with TiO2 nanotubes of two different diameters (25 and 70 nm), and the proliferation, apoptosis, angiogenesis-related genes expression and Hedgehog signaling activity of human umbilical vein endothelial cells (HUVECs) grown onto these MNTs were measured...
November 19, 2018: Artificial Cells, Nanomedicine, and Biotechnology
https://www.readbyqxmd.com/read/30425488/decreased-porphyromonas-gingivalis-adhesion-and-improved-biocompatibility-on-tetracycline-loaded-tio-2-nanotubes-an-in-vitro-study
#9
Lei Sun, Jiliang Xu, Zihuan Sun, Fang Zheng, Chun Liu, Chao Wang, Xiaoye Hu, Lunguo Xia, Zhou Liu, Rong Xia
Background: Titanium dioxide (TiO2 ) nanotubes are often used as carriers for loading materials such as drugs, proteins, and growth factors. Materials and methods: In this study, we loaded tetracycline onto TiO2 nanotubes to demonstrate its antibacterial properties and biocompatibility. The two-layered anodic TiO2 nanotubes with a honeycomb-like porous structure were fabricated by using a two-step anodization, and they were loaded with tetracycline by using a simplified lyophilization method and vacuum drying...
2018: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/30417513/ppy-encapsulated-sns2-nanosheets-stabilized-by-defects-on-tio2-support-as-durable-anode-material-for-lithium-ion-battery
#10
Ling Wu, Jie Zheng, Liang Wang, Xunhui Xiong, Yanyan Shao, Gang Wang, Jeng-Han Wang, Shengkui Zhong, Minghong Wu
Nanostructured alloy-type anodes have received great interests for high-performance lithium ion batteries (LIBs). However, these anodes experience huge volume fluctuations during repeated lithiation/delithiation and are easily pulverized and subsequently form aggregates. Herein, an efficient method to stabilize alloy-type anodes by creating defects on the surface of metal oxide support is proposed. As a demonstration, PPy-encapsulated SnS2 nanosheets supported on defect-rich TiO2 nanotubes are produced and investigated as an anode material for LIBs...
November 11, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/30416913/impact-of-the-anodization-time-on-the-photocatalytic-activity-of-tio-2-nanotubes
#11
Jesús A Díaz-Real, Geyla C Dubed-Bandomo, Juan Galindo-de-la-Rosa, Luis G Arriaga, Janet Ledesma-García, Nicolas Alonso-Vante
Titanium oxide nanotubes (TNTs) were anodically grown in ethylene glycol electrolyte. The influence of the anodization time on their physicochemical and photoelectrochemical properties was evaluated. Concomitant with the anodization time, the NT length, fluorine content, and capacitance of the space charge region increased, affecting the opto-electronic properties (bandgap, bathochromic shift, band-edge position) and surface hydrophilicity of TiO2 NTs. These properties are at the origin of the photocatalytic activity (PCA), as proved with the photooxidation of methylene blue...
2018: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/30398305/surface-plasmon-resonance-enhanced-visible-nir-driven-photocatalytic-and-photothermal-catalytic-performance-by-ag-mesoporous-black-tio2-nanotubes-heterojunctions
#12
Panzhe Qiao, Bojing Sun, Haoze Li, Kai Pan, Guohui Tian, Lei Wang, Wei Zhou
Ag/mesoporous black TiO2 nanotubes heterojunctions (Ag-MBTHs) are fabricated through surface hydrogenation, wet-impregnation and photoreduction strategy. The as-prepared Ag-MBTHs possess a relatively high specific surface area of ~85 m2 g-1 and an average pore size of ~13.2 nm. The Ag-MBTHs with narrow bandgap of ~2.63 eV extend the photoresponse from UV to visible light and near-infrared (NIR) region, which exhibit excellent visible-NIR-driven photothermal catalytic and photocatalytic performance for complete conversion nitro aromatic compounds (100%) and mineralization of high-toxic phenol (100%)...
November 6, 2018: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/30388387/the-controlled-naringin-release-from-tio-2-nanotubes-to-regulate-osteoblast-differentiation
#13
Min Lai, Ziyang Jin, Mengying Yan, Jing Zhu, Xufeng Yan, Kui Xu
To design titanium (Ti)-based biomaterials with controlled drug-releasing bioactive property, TiO2 nanotubes with a diameter of approximately 110 nm was fabricated by electrochemical anodization. TiO2 nanotubes were then loaded with naringin by direct dropping and coated with chitosan layers. The surface morphologies, chemical compositions and wettability of different substrates were characterized by field emission scanning electron microscopy, atomic force microscope, X-ray photoelectron spectroscopy and contact angle measurement, respectively...
November 2018: Journal of Biomaterials Applications
https://www.readbyqxmd.com/read/30368927/1d-sub-nanotubes-with-anatase-bronze-tio-2-nanocrystal-wall-for-high-rate-and-long-life-sodium-ion-batteries
#14
Biao Chen, Yuhuan Meng, Fangxi Xie, Fang He, Chunnian He, Kenneth Davey, Naiqin Zhao, Shi-Zhang Qiao
The development of 1D nanostructures with enhanced material properties has been an attractive endeavor for applications in energy and environmental fields, but it remains a major research challenge. Herein, this work demonstrates a simple, gel-derived method to synthesize uniform 1D elongated sub-nanotubes with an anatase/bronze TiO2 nanocrystal wall (TiO2 SNTs). The transformation mechanism of TiO2 SNTs is studied by various ex situ characterization techniques. The resulting 1D nanostructures exhibit, synchronously, a high aspect ratio, open tubular interior, and anatase/bronze nanocrystal TiO2 wall...
November 2018: Advanced Materials
https://www.readbyqxmd.com/read/30367003/microbiological-and-cellular-evaluation-of-fluorine-phosphorus-doped-titanium-alloy-a-novel-antibacterial-and-osteostimulatory-biomaterial-with-potential-applications-in-orthopedic-surgery
#15
John-Jairo Aguilera-Correa, Aranzazu Mediero, Francisco-Miguel Conesa-Buendía, Ana Conde, María-Ángeles Arenas, Juan-José de-Damborenea, Jaime Esteban
Joint prosthesis failure is mainly related to aseptic loosening and prosthetic joint infections, both of which are associated with high morbidity and substantial costs for patients and health systems. The development of a biomaterial that is capable of stimulating bone growth while minimizing bacterial adhesion would reduce the incidence of prosthetic failure. We report antibacterial and osteostimulatory effects in a novel F-P-doped TiO2 oxide film grown on Ti-6Al-4V alloy with a nanostructure of bottle-shape nanotubes -bNT samples-using five bacterial species ( Staphylococcus aureus , S...
October 26, 2018: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/30362766/on-the-interfacial-adhesion-between-tio-2-nanotube-array-layer-and-ti-substrate
#16
Shikai Cao, Wenqiang Huang, Lizhen Wu, Mengmeng Tian, Ye Song
Anodic titania nanotube arrays (TNTAs) with higher aspect ratio are observed to be liable to spontaneous curling or delamination from the underlying titanium (Ti) metal once dried because of the poor interfacial adhesion of the TNTA layer to the underlying Ti, especially when a thin Ti sheet is used. The interfacial adhesion strength was shown to decrease with increasing thickness of the TNTA layer. In this work, although the preparation of TNTAs in a frequently used fluoride-containing solution was completed, different anodization processes were further performed at lower current densities or at lower voltages for a short time in the same electrolyte to increase the adhesion...
November 7, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/30357698/modification-of-titanium-implant-and-titanium-dioxide-for-bone-tissue-engineering
#17
Tae-Keun Ahn, Dong Hyeon Lee, Tae-Sup Kim, Gyu Chol Jang, SeongJu Choi, Jong Beum Oh, Geunhee Ye, Soonchul Lee
Bone tissue engineering using titanium (Ti) implant and titanium dioxide (TiO2 ) with their modification is gaining increasing attention. Ti has been adopted as an implant material in dental and orthopedic fields due to its superior properties. However, it still requires modification in order to achieve robust osteointegration between the Ti implant and surrounding bone. To modify the Ti implant, numerous methods have been introduced to fabricate porous implant surfaces with a variety of coating materials. Among these, plasma spraying of hydroxyapatite (HA) has been the most commonly used with commercial success...
2018: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/30352603/usefulness-of-myeloperoxidase-as-a-biomarker-for-the-ranking-of-pulmonary-toxicity-of-nanomaterials
#18
Taisuke Tomonaga, Hiroto Izumi, Yukiko Yoshiura, Toshihiko Myojo, Takako Oyabu, Byeong-Woo Lee, Takami Okada, Takashi Marui, Ke-Yong Wang, Masaru Kubo, Manabu Shimada, Shingo Noguchi, Chinatsu Nishida, Kazuhiro Yatera, Yasuo Morimoto
BACKGROUND: In order to examine whether myeloperoxidase (MPO) can be a useful marker for evaluating the pulmonary toxicity of nanomaterials, we analyzed MPO protein in bronchoalveolar lavage fluid (BALF) samples obtained from previous examinations of a rat model. In those examinations we performed intratracheal instillation exposures (dose: 0.2-1.0 mg) and inhalation exposures (exposure concentration: 0.32-10.4 mg/m3 ) using 9 and 4 nanomaterials with different toxicities, respectively...
October 23, 2018: Particle and Fibre Toxicology
https://www.readbyqxmd.com/read/30339976/design-of-a-simple-and-novel-photoelectrochemical-aptasensor-for-detection-of-3-3-4-4-tetrachlorobiphenyl
#19
Lifang Fan, Caiyun Zhang, Huijie Shi, Guohua Zhao
In view of the urgent need of determining polychlorinated biphenyls in the environment, we developed a highly sensitive and selective photoelectrochemical (PEC) aptasensor for determination of 3,3',4,4'-tetrachlorobiphenyl (PCB77) by immobilizing aptamer on N-doped TiO2 nanotubes (N-doped TiO2 NTs). To improve analytical performance of the PEC sensor, the complementary DNA functionalized CdS quantum dots (DNA-CdS QDs) were introduced onto N-doped TiO2 NTs by hybridization. In addition of PCB77, owing to high affinity of aptamer to PCB77, PCB77-aptamer complexes were formed by being bound of PCB77 whilst DNA-CdS QDs were released from the sensing surface...
January 15, 2019: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/30339533/comparison-of-the-photocatalytic-performance-of-tio-2-ac-and-tio-2-cnt-nanocomposites-for-methyl-orange-photodegradation
#20
Liping Wang, Jingru Guo, Jingjing Dang, Xiaojun Huang, Si Chen, Weisheng Guan
To enhance the photocatalytic degradation efficiency of TiO2 on methyl orange (MO) removal, TiO2 /AC (activated carbon) and TiO2 /CNT (carbon nanotube) composites were synthesized. The prepared catalysts were characterized by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR). The photocatalytic performance of the obtained composites were investigated by the degradation of MO under UV irradiation (254 nm, 365 nm). The results revealed that the prepared nanocomposite showed higher MO degradation efficiency than pure nano-TiO2 ...
October 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
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