In this research different composites of impregnated TiO2 with LTA or FAU zeolites were used as different weight&#x25; ratio for photodegradation of organic dye. Normal laboratory UV-lamps were used as a source of UV irradiation. In addition a setup of system of mirrors was used to collect real Jeddah sunlight. A comparison of UV and real sunlight photodegradation activity showed that the real sunlight enhances new centers of active sites exhibiting higher catalytic activity than that of UV irradiated samples.

Laila M. Al-Harbi

Samia A. Kosa

Islam H. Abd El Maksod

Eman Z. Hegazy

The Photocatalytic Activity of TiO2-Zeolite Composite for Degradation of Dye Using Synthetic UV and Jeddah Sunlight

Magnetically recyclable materials should be ideal support in photocatalytic system because they permit the photocatalysts to be recovered rapidly and efficiently by applying an external magnetic field such as, MnF2. In this paper, MnF2 and SiO2 layers constitute a one-dimensional quasiperiodic photonic crystal according to Fibonacci. When the electromagnetic wave irradiates obliquely, the transmission peak moves to higher frequency direction with the angle increasing. Both the number of transmission peaks and the transmission peaks of double-forked structure increase with the increase of structural progression. We also found that the polarization of electromagnetic waves has influence on the transmission properties; TM wave transmission peak half wide is significantly greater than TE wave transmission peak half wide. The band gap near antiferromagnetic (AF) resonance frequency becomes narrow as the intensity of the applied static magnetic field increases. The as-prepared photonic crystal has tremendous potential practical use to eliminate organic pollutants from wastewater.

Qiang Zhang

Xuan-Zhang Wang

Shu-Fang Fu

Jing Bai

Sheng Zhou

MnF2/SiO2 Transport Properties of Quasiperiodic Photonic Crystals for Potential Catalytic Applications

The dispersion state of individual MWCNT in the polymer matrix influences the mechanical, thermal, and electrical properties of the resulting composite. One method of obtaining a good dispersion state of MWCNT in a polymer matrix is to functionalize the surface of MWCNT using various treatments to enhance the surface energy and increase the dispersibility of MWCNT. In this study, wettability and surface energy of UV/O3 and acid-treated multiwall carbon nanotubes (MWCNTs) and its polymethyl methacrylate (PMMA) polymer nanocomposites were measured using contact angle analysis in various solvent media. Contact angle analysis was based on ethylene glycol-water-glycerol probe liquid set and data was further fitted into geometric mean (Fowkes), van Oss-Chaudhury-Good (GvOC), and Chang-Qing-Chen (CQC) models to determine both nonpolar and acid base surface energy components. Analysis was conducted on MWCNT thin films subjected to different levels of UV/O3 and acid treatments as well as their resulting MWCNT/PMMA nanocomposites. Contact angle analysis of thin films and nanocomposites revealed that the total surface energy of all samples was well fitted with each other. In addition, CQC model was able to determine the surface nature and polarity of MWCNT and its nanocomposites. Results indicated that the wettability changes in the thin film and its nanocomposites are due to the change in surface chemistry. Finally, electrical properties of nanocomposites were measured to investigate the effect of surface functionality (acid or basic) on the MWCNT surfaces.

Seil Kim

Abdullah A. Kafi

Ehsan Bafekpour

Young-In Lee

Bronwyn Fox

Manwar Hussain

Yong-Ho Choa

Wettability Investigation of UV/O3 and Acid Functionalized MWCNT and MWCNT/PMMA Nanocomposites by Contact Angle Measurement

Porous conductors with large surface-volume ratios have been applied to a variety of fields, including absorbents, flexible heaters, and electrodes for supercapacitors. In this study, we implemented sensitive pressure sensors using the mechanical and electrical characteristics of conductive porous structures manufactured by immersing sponges into a carbon nanotube solution and then measured the change in resistance. When pressure was applied to conductive sponges, carbon nanotubes were attached to each other and the resistance was reduced by up to 20&#x25;. The carbon nanotube sponges, which were soft and had superior elasticity, were quickly stabilized without any changes taking place in their shape, and they showed consistent change in resistance during experiments of repetitive pressure. The pressure devices based on conductive porous sponges were connected to single-walled carbon nanotube field effect transistors (SWCNT-FETs) and changes in their characteristics were investigated according to external pressure.

Hye-Mi So

Cheolmin Park

Won Seok Chang

Electromechanical Response of Conductive Porous Structure

High-dose thermoluminescence dosimetry properties of novel zinc oxide nanophosphors synthesized by a solution combustion method in a glycine-nitrate process are presented for the very first time in this work. Sintered particles with sizes ranging between &#x7e;500&#x2009;nm and &#x7e;2&#x2009;&#x3bc;m were obtained by annealing the synthesized ZnO at 900&#xb0;C during 2&#x2009;h in air. X-ray diffraction patterns indicate the presence of the ZnO hexagonal phase, without any remaining nitrate peaks observed. Thermoluminescence glow curves of ZnO obtained after being exposed to beta radiation consists of two maxima: one located at &#x7e;149&#xb0;C and another at &#x7e;308&#xb0;C, the latter being the dosimetric component of the curve. The integrated TL fading displays an asymptotic behavior for times longer than 16&#x2009;h between irradiation and the corresponding TL readout, as well as a linear behaviour of the dose response without saturation in the studied dose interval (from 12.5 up to 400&#x2009;Gy). Such features place synthesized ZnO as a promising material for high-dose radiation dosimetry applications.

V. R. Orante-Barr&#xf3;n

F. M. Escobar-Ochoa

C. Cruz-V&#xe1;zquez

R. Bernal

Thermoluminescence of Novel Zinc Oxide Nanophosphors Obtained by Glycine-Based Solution Combustion Synthesis

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Journal of Nanomaterials publishes research on nanoscale and nanostructured materials with an emphasis on synthesis, processing, characterization, and the applications of nanomaterials.

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Chief Editor Stefano Bellucci is Professor of Theoretical Physics at the National Institute for Nuclear Physics in Frascati, Italy. His research interests include&nbsp;nanoscience and nanotechnology, nanocarbon-based composites, and the biomedical applications of nanomaterials.

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Journal of Nanomaterials - Table of contents 2015

title

Journal of Nanomaterials publishes research on nanoscale and nanostructured materials with an emphasis on synthesis, processing, characterization, and the applications of nanomaterials.

Journal of Nanomaterials

Table of Contents

Table of Contents: 2015

The Photocatalytic Activity of TiO₂-Zeolite Composite for Degradation of Dye Using Synthetic UV and Jeddah Sunlight

MnF₂/SiO₂ Transport Properties of Quasiperiodic Photonic Crystals for Potential Catalytic Applications

Wettability Investigation of UV/O₃ and Acid Functionalized MWCNT and MWCNT/PMMA Nanocomposites by Contact Angle Measurement

Electromechanical Response of Conductive Porous Structure

Thermoluminescence of Novel Zinc Oxide Nanophosphors Obtained by Glycine-Based Solution Combustion Synthesis