Materials Literature
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In this article, we present a theoretical study of the optical spectrum induced by electron-electron interaction in graphene, which can be compared with the case in a conventional two-dimensional electron gas (2DEG). It is found that in sharp contrast to the conventional 2DEG, two intra- and inter-band transition chan…
Musa Şahın*a, Tülay Bal-demırcıa, Namik Özdemırb & Bahrı Ülküsevenaa Faculty of Sciences, Department of Chemistry, Istanbul University, Istanbul, Turkeyb Faculty of Arts and Sciences, Department of Physics, Ondokuz Mayıs University, Samsun, Turkey* Corresponding author. Email: musahin@istanbul.edu.trThree alkylated th…
A transport-based formulation is used to model three-dimensional objects made of a uniaxial wire medium. The resulting drift-diffusion equation is used to calculate the extinction/scattering cross section of various uniaxial wire medium objects. A comparison is made with measurement and full wave simulation results. T…
Many proteins perform essential biological functions by means of regions that lacking specific organized structure exist as an ensemble of interconverting transient conformers. The characterization of such regions, including the description of their structural propensities, number of conformations and relative populat…
The 18 toroidal field coils of the JT-60SA are mechanically linked by the so called “Outer Intercoil Structure” (OIS). Each OIS is bolted to its neighbors by five splice plates: this presents the double advantage of facilitating the assembly of the structure as well as ensuring an efficient electrical insulation by th…
We have measured the low-frequency noises of ultrathin indium tin oxide films to investigate the effect of post annealing on the noise level. The noises obtained obey an approximate 1/f law in the frequency range f ≈ 0.1–20 Hz. The microstructures and grain sizes of our films were altered by adjusting the annealing co…
In previous papers analytical expressions were derived and validated for the packing fraction of bimodal hard spheres with small size ratio, applicable to ordered (crystalline) [H. J. H. Brouwers, Phys. Rev. E 76, 041304 (2007);H. J. H. Brouwers, Phys. Rev. E 78, 011303 (2008)] and disordered (random) packings [H. J.…
A bidomain oligomer containing a ( P )-amidohelicene tetramer domain and a ( P )-ethynylhelicene tetramer domain formed self-assembled organogels in the presence of an ( M )-ethynylhelicene pentamer. Strong Cotton effects were observed for gels in pyridine, piperidine, cyclohexanone, and 1,2-dimethoxybenzene (Type A s…
ABSTRACT A series of novel poly(thienylene vinylene) derivatives (PTVs), P20‐P24, with imide substituents were designed and synthesized by palladium‐catalyzed Stille coupling polymerization, wherein the imide substituent density was decreased gradually, which allowed us to explicitly study the effect of electron‐defic…
Plasmonic nanostructures composed of an outer dish and an inner disk are generated and applied as a nanoscale ruler for analyzing the polarization of light. A multi-compositional nanostructure, in which chemically active materials are positioned as the inner disks inside the gold dishes, is also demonstrated to monito…
We report enhanced internal quantum efficiency and absorption of parallel-like bulk heterojunction small molecular organic solar cells by inserting multi-functional layers (MFLs). The inserted MFL has an energy level between main donor and acceptor levels, assisting exciton dissociation of the charge transfer state an…
Antineoplastic drug ellipticine and its derivatives are used in human cancer therapy. However, their clinical applications have been limited by its great hydrophobicity and severe side effects. An efficient delivery system is therefore very desirable. In this research, an ellipticine-loaded core-shell structured nanos…
Efficiency of photoinduced charge transfer (CT) reactions in supramolecular assemblies is often compromised due to the rigid parametrization of acceptable donor-acceptor (D-A) distances and orientations. Using a combined approach of time-resolved optical measurements and electronic structure studies guided by molecula…
Novel branched polyoxymethylene copolymers are synthesized by cationic copolymerization of 1,3,5‐trioxane (TOX) with 3‐(alkoxymethyl)‐3‐ethyloxetane (ROX) using BF3·Et2O as an initiator. Four oxetane derivatives with different side‐chain lengths (from 1 to 6 carbons) are tested for copolymerization. The copolymer comp…
We here present our state of art spark plasma sintering technology in ultrafast fabricating transparent Ce:YAG@MgAl2O4 composite ceramics based white light emitting diodes directly from powder synthesis to final devices. The total heat processing time is less than 3 h. The optical properties of the sintered transparen…
An elliptical monolithic bifocal zone plate as a collimating lens, whose two focal lengths in the orthogonal directions match the different beam waist positions of the fast and slow axes' light from edge-emitting laser diodes, is proposed and experimentally demonstrated by employing femtosecond laser direct writing te…
We developed a simple method to stabilize colloidal solutions of amino-grafted nanoparticles based on electrostatic interactions with poly(acrylic) acid (PAA). This process is instantaneous, technically simple and nondenaturing for the ferrofluids because it occurs at room temperature. This interaction increases stabi…
A small angle X-ray scattering (SAXS) study of nanovoids in 99.988 and 99.995 at.% aluminium is presented. Absolute intensity calibration using a glassy carbon standard is used to extract the weak SAXS signature from nanovoids introduced by thermal quenching. SAXS analysis methods, including Guinier, Porod and Indirec…
To form a cable-in-conduit conductor (CICC) a cable should be inserted into a jacket under tensile force that is increasing with length of insertion. This tensile force can lead to both elongation and untwisting of a cable with increase of a twist pitch. The untwisting can also be induced by stress accumulated in the…
Si/SiO2 core/shell quantum dots (QDs) have been shown with wavelength-tunable photoluminescence in addition to their inert, nontoxic, abundant, low-cost, biocompatible advantages. Due to their big size, here, we apply density-functional tight-binding (DFTB) method to perform calculations to study their structures and…