Materials Literature
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The crystalline thin film growth of the organic material, copper phthalocyanine (CuPc), by organic vapor-phase deposition (OVPD) is studied using high-pressure reflection high-energy electron diffraction (HP-RHEED). In situ growth of this material was monitored, in real time, on both highly oriented pyrolytic graphite…
For the first five members of the homologous series of 4-n-alkyl-4'-cyanobiphenyls in the nematic and isotropic phases, molecular dynamics (MD) simulations were performed by using a united atom model. An odd-even effect was seen to be found in the molecular length, width, biaxiality, and inertia tensor anisotropy with…
The microrheology of viscoelastic fluids containing light-scattering inclusions is measured by depolarized dynamic light scattering (DDLS) from optically anisotropic spherical colloidal probes. The anisotropy of the probes allows us to measure both their translational and the rotational mean squared displacements simu…
The authors synthesized high-quality gold nano-sea-urchin in aqueous solution with an environment-friendly method. They found that the gold nano-sea-urchin can induce the interaction of surface plasmon resonance (SPR) mode with substrate. The SPR peak splits and blueshifts from 630to440nm and the result has potential…
The ultraviolet (UV) irradiation of a titanium dioxide (TiO2) film surface gives rise to two simultaneous phenomena: photocatalysis and superhydrophilicity. Photocatalysis has been thoroughly studied, but the mechanism governing superhydrophilicity remains controversial. The authors’ investigations show the effects in…
Silicon nanoclusters were formed in plasma-enhanced chemical vapor deposited substoichiometric silicon oxide films by annealing at 1100°C for 1∕2h as a function of different deposition parameters. The samples were analyzed by energy filtered transmission electron microscopy and Rutherford backscattering. At any deposi…
We use the -operator to construct a family of Fibonacci tilings of the unit interval consisting of short and long elementary intervals with the ratio of the lengths equal to the golden section . We prove that the tilings satisfy a recurrence relation similar to the relation for the Fibonacci numbers. The ends of the e…
The electronic behavior of metallic carbon nanotubes under the influence of atomistic vacancy defects present in the channel is theoretically investigated using non-equilibrium Green’s function method self-consistently coupled with three-dimensional electrostatics. A nearest neighbor tight binding model based on a sin…
Nephrogenic systemic fibrosis/nephrogenic fibrosing dermopathy (NSF/NFD) is a rare fibrosing disorder that occurs in patients with renal failure. It is associated with significant mortality and morbidity. Patients typically present with painful or pruritic indurated plaques involving the limbs and trunk, with sparing…
BACKGROUND: Nephrogenic fibrosing dermopathy/nephrogenic systemic fibrosis (NFD/NSF) is a fibrosing cutaneous disorder recently recognized to have systemic manifestations. The disease is characterized clinically by an acute onset of hardening and thickening of the skin of the extremities and trunk, often resulting in…
Abstract To increase the compatibility of polystyrene (PS) and polyolefin elastomer (POE) blends, a Lewis acid catalyst, aluminum chloride (AlCl 3 ), was adopted to initiate the Friedel–Crafts alkylation reaction for the formation of PS‐ graft ‐POE copolymer. Dynamic mechanical analysis indicated that PS/POE and PS/PO…
The atomic force microscopy images showed that the dimensional structural transformation from CdxZn1−xTe quantum dots (QDs) with Cd mole fractions of 0.5 and 0.6 to CdxZn1−xTe quantum wires occurred at a Cd mole fraction of 0.8. Photoluminescence spectra showed that the excitonic peak corresponding to the transition f…
Employing high-tunability PbO–ZnO–Nb2O5 thin film dielectrics, low-voltage and high-tunability interdigital capacitors (IDCs) were implemented on a silicon substrate. In order to reduce the bias voltage of the IDC and increase its tunability, its electrodes were fully embedded into the thin film dielectrics to confine…
This paper is devoted to the interpretation of scanning tunneling microscopy (STM) images of a single atomic vacancy on single and double graphene sheets as a model for the (0001) surface of graphite. We first selected a one-layer model which would allow us to run periodic density-functional theory calculations withou…
Abstract Dynamically vulcanized blends of polyoxymethylene (POM) and ethylene propylene diene terpolymer (EPDM) with and without compatibilizer were prepared by melt mixing in a twin screw extruder. Maleic anhydride (MAH) grafted EPDM (EPDM‐ g ‐MAH) has been used as a compatibilizer. Dicumyl peroxide was used for vulc…
Abstract High strength fibers were prepared from high density polyethylene (HDPE)/organically modified montmorillonite (OMMT) composites. X‐ray diffraction study revealed that the composites were of conventional or phase‐separated type. As‐spun composite fibers were found to have higher drawability than as‐spun HDPE f…
Abstract Three different types of characteristic structures‐microcells, nanoclay, and crystallite lamella‐exist in injection molded polyamide‐6 microcellular nanocomposites. These structures are in completely different scales. The spatial orientation of these microscale structures crucially determines the material's b…
Dielectric relaxation and ultrasonic attenuation spectra of Sr4La2Ti4Nb6O30 tungsten bronze ceramics were investigated over a broad temperature range. A broad permittivity peak with strong frequency dispersion was observed around 200K, which followed well the Vogel-Fulcher relationship, and is attributed to relaxor fe…
The paper presents a new analytical method for extracting the diode ideality factor of a p-n junction device using Lambert W-function model and the dark current-voltage data. The extracted values are found to be in good agreement with those calculated experimentally from dark current-voltage characteristics. © TÜBİTAK.
The authors experimentally demonstrate a magnetically tunable optical negative refraction (NR) in nematic liquid crystals (NLCs), arising from the variation of optical anisotropy in the NLCs induced by external magnetic field. By measuring the refraction angle of the transmitted beam through the prism-shaped NLC devic…