scholarly journals High-Efficiency, Near-Diffraction Limited, Dielectric Metasurface Lenses Based on Crystalline Titanium Dioxide at Visible Wavelengths

Nanomaterials ◽  
2018 ◽  
Vol 8 (5) ◽  
pp. 288 ◽  
Author(s):  
Yaoyao Liang ◽  
Hongzhan Liu ◽  
Faqiang Wang ◽  
Hongyun Meng ◽  
Jianping Guo ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
High Efficiency ◽  
Visible Wavelengths ◽  
Dielectric Metasurface

Enhancement on Stability of Nanosized Titanium Dioxide in Silicone Suspension Using Diblock Copolymer: Influence of Dispersant Structure

2013 ◽  
Vol 747 ◽  
pp. 599-602
Author(s):  
Surachet Toommee ◽  
Nisanart Traiphol
Keyword(s):  
Titanium Dioxide ◽  
Surface Area ◽  
Diblock Copolymer ◽  
High Efficiency ◽  
Particle Surface ◽  
Ethyl Acrylate ◽  
Polymer Structure ◽  
Particle Agglomeration ◽  
Nanosized Titanium Dioxide ◽  
Enhanced Adsorption

This research investigates using of poly (dimethylsiloxane-b-hydroxy ethyl acrylate) (PDMS-b-PHEA) diblock copolymer to stabilized TiO2nanoparticles in silicone fluid. The polar PHEA segment is expected to anchor on TiO2surface while the non-polar PDMS segment extends into silicone medium. To study effects of polymer structure on its stabilizing efficiency, PDMS-b-PHEA of structures 5-b-0.3, 5-b-1.1 and 8-b-1.0 are used. Results show that suspensions of particle with surface area ~40 and ~200 m2/g can be stabilized for longer than 1 and 7 hrs, respectively. The copolymer with relatively long PHEA and PDMS segments is highly effective as a dispersant. This is due to enhanced adsorption on particle surface and steric stabilization. However, in the system of 40 m2/g-TiO2, excess amounts could lead to polymer entanglement and particle agglomeration. The copolymer dispersant exhibits high efficiency for the 200 m2/g-TiO2suspension as well. In the latter system, higher concentration is required to effectively cover particle surface.

An Au nanofin array for high efficiency plasmonic optical retarders at visible wavelengths

2015 ◽  
Vol 106 (2) ◽  
pp. 021115 ◽  
Author(s):  
Miho Ishii ◽  
Kentaro Iwami ◽  
Norihiro Umeda
Keyword(s):  
High Efficiency ◽  
Visible Wavelengths

Phenol Removal from Contaminated Wastewater Using Activated Carbon/Zeolite Composite Coated with Titanium Dioxide

2016 ◽  
Vol 690 ◽  
pp. 103-108
Author(s):  
Khemmakorn Gomonsirisuk ◽  
Thanakorn Wasanapiarnpong ◽  
Charusporn Mongkolkachit
Keyword(s):  
Titanium Dioxide ◽  
Activated Carbon ◽  
High Efficiency ◽  
Adsorption Property ◽  
Phenol Concentration ◽  
Study Phase ◽  
Phenol Removal ◽  
High Porosity ◽  
Good Efficiency ◽  
Composite Substrate

Phenol and phenolic compounds in wastewater from various industries were toxic to water livings and human even in ppm concentration. A number of photocatalysts and adsorbents were applied for the low cost and good efficiency wastewater management to reduce phenol concentration in water. In this work titanium dioxide, one of high efficiency photocatalysts which is widely used in water treatement, was coated on the fabricated adsorbent composite substrate. The composite substrate composed of activated carbon and NaA zeolite presents high phenol adsorption because of high porosity and good ion exchange properties resulting in good adsorption property. Accordingly, the absorption could promote the photocatalytic activity of TiO2 catalyst. As the specimens were easily disposed after water treatment process, therefore, it was a good choice for lower energy consumption. The composite substrate was easily fabricated by simple extrusion and fired under non oxidation atmosphere at 650°C for 3 hours. Then polyurethane foam was inserted into the composite substrate to make it be able to float and be swirled by wind near water surface to get more UV excitation than deeper water. Phenol concentration was investigated by the UV absorbance at 270 nm using UV-Vis spectrophotometer. The XRD and SEM were used to study phase crystal structure and morphology of the composite.

scholarly journals Synthesis of Zinc Oxide Supported on Titanium Dioxide for Photocatalytic Oxidative Desulfurization of Dibenzothiophene

2018 ◽  
Vol 1 (1) ◽  
Author(s):  
Hitam, C.N.C. ◽  
Jalil, A.A. ◽  
Triwahyono, S.
Keyword(s):  
Zinc Oxide ◽  
Titanium Dioxide ◽  
High Efficiency ◽  
Diffuse Reflectance Spectroscopy ◽  
Anatase Phase ◽  
Oxidative Desulfurization ◽  
Xrd Analysis ◽  
X Ray Diffraction ◽  
Desulfurization Rate ◽  
Low Energy Consumption

Photocatalytic oxidative desulfurization (PODS) has received much attention due to low energy consumption and high efficiency, as well as simple and pollution-free operation. In this study, zinc oxide supported on titanium dioxide (ZnO/TiO2) catalysts were prepared via a simple electrochemical method. The presence of anatase phase TiO2 and wurtzite ZnO was confirmed by X-ray diffraction (XRD) analysis while band gap energies were determined by UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS). The photocatalytic activity was tested for desulfurization of 100 mg/L dibenzothiophene (DBT). The highest desulfurization rate (2.20 × 10-3 mM/min) was achieved using 1 g/L of 10 wt% ZnO/TiO2 after 2 hr under UV irradiation.

Titanium dioxide slot waveguides for visible wavelengths

2015 ◽  
Vol 54 (10) ◽  
pp. 2653 ◽  
Author(s):  
Markus Häyrinen ◽  
Matthieu Roussey ◽  
Antti Säynätjoki ◽  
Markku Kuittinen ◽  
Seppo Honkanen
Keyword(s):  
Titanium Dioxide ◽  
Visible Wavelengths ◽  
Slot Waveguides

scholarly journals Spectral broadening in anatase titanium dioxide waveguides at telecommunication and near-visible wavelengths

2013 ◽  
Vol 21 (15) ◽  
pp. 18582 ◽  
Author(s):  
Christopher C. Evans ◽  
Katia Shtyrkova ◽  
Jonathan D. B. Bradley ◽  
Orad Reshef ◽  
Erich Ippen ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Spectral Broadening ◽  
Visible Wavelengths

Tungsten doped titanium dioxide nanowires for high efficiency dye-sensitized solar cells

2014 ◽  
Vol 16 (16) ◽  
pp. 7448-7454 ◽  
Author(s):  
P. S. Archana ◽  
Arunava Gupta ◽  
Mashitah M. Yusoff ◽  
Rajan Jose
Keyword(s):  
Titanium Dioxide ◽  
Solar Cells ◽  
High Efficiency ◽  
Dye Sensitized Solar Cells ◽  
Photocurrent Density ◽  
Niobium Doping ◽  
Dye Sensitized ◽  
Dye Loading ◽  
Doped Titanium Dioxide ◽  
Sensitized Solar Cells

Tungsten doping in TiO2 nanowires led to increased photocurrent density resulting from increased lifetime and dye-loading compared to niobium doping.

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