Materials Literature
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The resistances of magnesium alloys to wear, friction and corrosion can be effectively improved by depositing coatings on their surfaces. However, the coatings can also reduce the heat transfer from the coated components to the surroundings (e.g., coated cylinder bores for internal combustion of engine blocks). In thi…
Poly(2-ethynyl-N-iodopyridinium iodide) [PEIPI] was easily prepared via in-situ uncatalyzed polymerization of 2-ethynylpyridine by using iodine. The activated acetylenic bond of 2-ethynyl-N-iodopyridinium iodide formed at the initial reaction time was assumed to be susceptible to linear polymerization, followed by an…
We fabricated interdigitated germanium (Ge) metal-semiconductor-metal photodetectors (MSM PDs) with interdigitated platinum (Pt) finger electrodes and investigated the effects of Pt finger width and spacing on their spectral response. An increase in the incident optical power enhances the creation of electron-hole pai…
Applicability of nonlocal models to nano-beams is discussed in terms of physical implications via the similarity between a nonlocal Euler-Bernoulli (EB) beam theory and a classical Rankine-Timoshenko (RT) beam theory. The nonlocal EB beam model, Eringen's model, is briefly reviewed and the classical RT beam theory is…
Graphite oxide (GO) is promising precursor for a bulk production of graphene-based materials due to easy preparation. Typically, exfoliation and reduction of GO have depended on either sonication process using chemical agents or heat treatment. In this study, we introduce a preparation of exfoliated and reduced GO pow…
Conventional oral dosage forms offer no control over drug delivery, leading to fluctuations in plasma drug level. The floating or hydrodynamically controlled drug delivery systems are useful in such application. Floating microspheres are especially suitable for achieving sustained or delayed release oral formulations…
The grain growth behavior of NiO nano grains in mesoporous gadolinium-doped ceria (GDC) network was investigated for anode materials of intermediate-temperature solid oxide fuel cell (SOFC). Both mesoporous GDC and NiO-GDC powders were synthesized using tri-block copolymer, Pluronic F127 as a structure-directing agent…
Characterization and electrocatalytic oxidation of formic acid on PtAu nanoparticles supported multiwalled carbon nanotube (MWCNT) were studied. Electrochemical measurements were conducted in a self-made conventional three-electrode glass cell at room temperature. A Pt wire and Ag/AgCl were used as auxiliary and refer…
Highly luminescent CdTe quantum dots (QDs) were synthesized through a co-precipitation route in aqueous salt solutions using different thiols as stabilizers. The synthetic procedure was simple, efficient, and stable. It could also allow controlling the emission wavelength by varying the experimental conditions such as…
Composite polymer electrolytes (CPEs) were prepared by containing blend of poly(ethylene oxide) (PEO) and poly(methyl methacrylate) (PMMA) as a host polymer, propylene carbonate as a plasticizer, and LiClO4 as a salt. By an addition of a various content of ionic liquid attached TiO2 (IL-TiO2) to above electrolytes, th…
Nanocomposites of n-type Zinc Oxide ( ZnO ) and p-type copper phthalocyanine ( CuPc ) were synthesized using solution route and the electrical properties of heterojunctions of ZnO and CuPc in the nanocomposite film was studied. For comparison, electrical properties of bilayer heterojunction devices using ZnO nanostruc…
For solid alkaline fuel cell applications, membrane-electrode assemblies (MEAs) should be prepared. Thus, in this study, anion-conducting ionomer binder was prepared for electrodes of MEAs. Specifically, we synthesized water soluble anionic binder solutions based on quaternized chitosan derivatives (QCDs) and cross-li…
Arrayed NiO co-catalyst on GaN is proposed to improve water splitting efficiency and to obtain stable photoelectrolysis without dissolution of photoanode. The characteristics of photoanodes were investigated by changing the height of NiO on n-GaN. The photoanode stability and performance of GaN with NiO was significan…
This comparative study investigates the mechanical properties of polycarbonate in manufacturing conditions of different cooling speed. All experiments were conducted using 0.8 mm thick specimens made of commercial Polycarbonate granule (3 mm), according to the ASTM standard. The test results illustrate that polycarbon…
In this study, patterned sapphire substrates are fabricated using nanosphere lithography (NSL) and inductively-coupled-plasma reactive ion etching (ICP-RIE). Polystyrene nanospheres of approximately 600 nm diameter are self-assembled on c-plane sapphire substrates by spin-coating. The diameter of the polystyrene nanos…
The influence of propionic acid on BaTiO3 particles prepared via hydorthermal method is discussed. The amount of the acid is varied in the experimental processes to enhance understanding of the roles of the propionic acid. Smaller sized BaTiO3 powders with more uniform particle sizes can be achieved at 200 degrees C a…
High adhesive superhydrophobic polymer pillar surfaces with dispersed metallic crown-like micro structures were prepared by electroless plating on self-organized honeycomb patterned polymer films and peeling off the top layer of the metal covered honeycomb films. Thus obtained polymer pillar surfaces with metallic cro…
Room-temperature ferromagnetism was found in BaTi0.98Mn0.02O3 nanoparticles fabricated by solid-state reaction and mechanical-ball milling. The nature of ferromagnetism was systematically investigated by means of X-ray diffraction (XRD), electron spin resonance (ESR), superconducting quantum interference device (SQUID…
In this study, the hydrothermal method is used to grow phosphorus-doped ZnO nanowires on Si/SiO2 substrates deposited with Al-doped ZnO thin film. This structure forms a homogeneous p-n junction. In this study, we are the pioneers to use ammonium hypophosphite (NH4H2PO2) as a source of phosphorus to prepare the precur…
A novel approach for characterization of non-conductive protein-immobilized nanoparticles using AC impedance spectroscopy combined with conductive atomic force microscopy was examined. As AC impedance spectroscopy can provide information on diverse electrical properties such as capacitance and inductance, it is applic…