Materials Literature
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The flexural wave behavior in carbon nanotubes embedded in an elastic medium is analyzed based on the classical and nonlocal theories of the Timoshenko beam. Emphasis is focused on the effects of small scale and the surrounding elastic medium on the phase velocity of the transverse wave. The system of basic equations…
Abstract Experiments on the effect of temperature on the optical and electro‐optical behaviors of polymer‐dispersed liquid crystals (PDLCs) are considered. Composite films composed of poly(methyl methacrylate) (PMMA) and the nematic‐type liquid crystal (LC) E7 were prepared by solvent casting in chloroform. The PDLC f…
In the absence of an external direction-controlling process, exclusive self-bundled arrays of CdS nanorods are formed using a facile solution-based method involving trioctylphosphine (TOP) and tetradecylphosphonic acids (TDPA) as cosurfactants. CdS self-bundled arrays with an area of as large as 2.0 microm(2) could be…
Scaling effects in polycrystalline ferroelectric thin films were investigated by preparing barium titanate in a manner that maintained constant composition and film thickness while allowing systematically increased grain size and crystalline coherence. The average grain dimensions ranged from 60to110nm, and temperatur…
Mechanical, physical, and barrier properties of films obtained from soy protein isolate solutions at different pH were studied and correlated with the structural properties and the microstructure of films. Films obtained at pH 2 and 11, which had denser microstructures and a higher amount of disulfide bonds, showed a…
Highly transparent (Bi,Eu)4Ti3O12 (BEuT) ferroelectric thin films were prepared on indium-tin-oxide (ITO)-coated glass substrates by using chemical solution deposition technique, and the photoluminescence and electrical properties of the thin films were investigated in terms of annealing temperature and concentration…
According to hydrophobicity and hydrophobicity transfer studies on silicone rubber surfaces, although the silicone rubber can transfer its hydrophobicity to various contaminants deposited on its surface, the hydrophobic states of water droplets on clean silicone rubber surfaces and on various contaminated silicone rub…
SrTiO 3 (111) samples, doped with Nb, are Ar + ion sputtered and annealed in ultrahigh vacuum (UHV) and in varying pressures of oxygen and investigated using scanning tunneling microscopy (STM) and Auger electron spectroscopy (AES). STM images show that a number of reconstructions constituting a family of ( n × n ) su…
c -axis oriented polycrystalline ZnO:Al (AZO) films were deposited at different substrate temperature (Ts) and oxygen ambient (PO2) by pulsed laser deposition. It is found that with the increase in Ts and PO2, the 2θ position of AZO (0002) shifts to higher angle, which can be attributed to the different amounts and sp…
Ali Durmusa*, Ahmet Kaşgöza & Christopher W. Macoskob a Faculty of Engineering, Department of Chemical Engineering , Istanbul University , Avcilar, Istanbul, Turkey b Department of Chemical Engineering and Materials Science , University of Minnesota , Minneapolis, MN, USA * Faculty of Engineering, Department of Chemic…
Inspired by the principle of holography we present a concept for making simple transmission screens that can focus an incident wave into a sub-wavelength spot in the near field. The screen is made out of closely spaced, unequal slits cut on a metallic sheet. Fullwave simulations are presented for an example screen tha…
The application of external dc voltages significantly increases the piezoelectric d33-coefficients of ferroelectret films and also enhances their thermal stability. In this paper, interferometric measurements and model calculations with such dc-biased ferroelectret films are reported. It is shown experimentally and th…
Dielectric properties of low-density polyethylene (LDPE) blended with metallocene catalyzed polyethylene (MPE) to 1, 3, 5 wt% of the latter are reported. It was found that the 1 wt% MPE blend had the lowest volume resistivity, the highest direct current (DC) breakdown strength and the least accumulated space charge. T…
Simultaneous advances in making, measuring, and modeling noble metal (plasmonic) particles--designated as the 3M's principle--have led to a perfect storm in discoveries and applications of gold nanoparticles. Three articles in this issue of ACS Nano illustrate this concept. First, exquisite control over gold nanorod l…
Indium-tin-oxide (ITO) films deposited on crystalline silicon wafer and Corning glass are prepared by direct-current magnetron sputtering method at room temperature with various thicknesses. The thickness dependences of structure, resistance and optical reflectance of ITO films are characterized. The results show that…
Ferritic/martensitic (F/M) steels are good candidate structural materials for the future fusion reactors and spallation sources. However, irradiation of steels is known to produce hardening, loss of ductility, shift in ductile to brittle transition temperature (DBTT) and reduction of fracture toughness and creep resis…
Cobalt-based Fischer-Tropsch systems are widely used to convert synthesis gas to clean hydrocarbon fuel. However, surprisingly little is known about the morphology of the catalysts on the nanoscale. Here we show that scanning transmission electron tomography reveals their true 3-D morphology and provides direct eviden…
The patterning of biologically active materials has been accomplished by the use of imprint lithography of functional photopolymer resins to create controlled nanoscale patterns of a cross-linked photopolymer containing embedded initiator groups. Functionalized polymer brushes consisting of polystyrene and poly(N,N-di…
A series of 4‐decyloxy‐4′‐hydroxybiphenyl esters of α,ω‐alkanedicarboxylic acids containing two mesogenic units connected by a methylene spacer was synthesized. The mesogenic properties of the compounds were investigated by polarising optical microscopy, differential scanning calorimetry and X‐ray diffraction methods.…
Positively charged silver nanoparticles, Ag [+], obtained by UV-assisted reduction of silver nitrate using branched poly(ethyleneimine) (BPEI) and 4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid (HEPES) solutions as reducing agents, were immobilized on glass surfaces to produce substrates active in surface-enhanced…