Materials Literature
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The electronic structure and ferroelectric polarization of multiferroic TbMn${}_{2}$O${}_{5}$ are investigated using the generalized gradient approximation (GGA) and the GGA plus on-site Coulomb interaction (GGA$+U$) methods. We find an insulating charge-orbital ordered ground state driven by octahedral and pyramidal…
Fiber mats of a synthetic anionic copolypeptide of l-glutamic acid and l-tyrosine (PLEY) have been produced by electrospinning, and physical, chemical, and biological properties of the fibers have been characterized in vitro. Fibers were obtained from polymer dissolved in water at concentrations of 20-60% (w/v) but no…
We measure the anisotropy of the crystal-fluid interfacial free energy in soft colloidal systems. A temperature gradient is used to direct crystal nucleation and control the growth of large single crystals in order to achieve well-equilibrated crystal-fluid interfaces. Confocal microscopy is used to follow both the gr…
We demonstrate a procedure for measuring the thermal conductivity of non-ideal thin-films with significant non-uniformity. By spatially mapping the thermal transport with time-domain thermoreflectance measurements, followed by statistical analysis, we determined the thermal conductivity of Cu composite films containin…
Abstract The mechanical strengths of neat low‐density polyethylene (LDPE), a blend of LDPE with linear low‐density polyethylene (LLDPE), and a composite of LDPE with wood flour (wood/LDPE) were investigated in molten and solidified states under tensile deformation. The results are discussed in terms of the effects of…
The two-dimensional (2D) spatial electric-field mapping apparatus [Opt. Express 14, 8694 (2006)] plays an important role in experiments involving metamaterials, such as the verification of free-space and ground-plane invisibility cloaks. However, such an apparatus is valid only for the transverse-electric (TE) mode an…
Unsymmetrical phthalocyanines with one or two TTF units were obtained by treating mixed 3,6-dioctyltetrathiafluvalenophthalonitrile and 4,5dioctoxyphthalonitrile with Li in n-hexanol.Their optical and electrochemical properties were examined by UV-vis spectroscopy and cyclic voltammetry.
This work reports the effect of lithium doping on the dielectric and polar properties of potassium tantalate. Experimental data were obtained in K 1− x Li x TaO 3 ceramics with x = 0, 0.02, 0.05 and 0.10 by measuring both the dielectric permittivity from 10 2 to 10 8 Hz, and polarization under an ac electric field dri…
The synthesis of a dithiol-functionalized pyrene derivative is reported, together with studies of interactions between this receptor (and other related pyrenes) and nitroaromatic compounds (NACs), in both solution and in the solid state. Spectroscopic analysis in solution and X-ray crystallographic analysis of cocryst…
We investigate the pinning of domain walls in ferroelectrics on the basis of the two phonon bound state (TPBS) or discrete breather state due to impurity energy levels above the phonon continua in ferroelectrics such as LiNbO3 in order to show the pinning transition, which indicates the point of easiest switching. We…
The Zn-dominant analogue of rockbridgeite, recently described mineral plimerite, was found in samples from the Huber open pit, the Krsno near Horn Slavkov ore district, western Bohemia, Czech Republic. Plimerite occurs there in five morphologically different types, as black-green to black semi-spherical to spheroidal…
The structural origin of the nonlinear optical susceptibility (/χ(3)/) of lead-niobium-germanate film glasses with large Nb2O5 contents has been investigated. /χ(3)/ shows a strong enhancement with the Nb content in the films with /χ(3)/ values close to 2 × 10−11 esu at 800 nm for a Nb content as high as 0.71. Boling-…
Abstract SrMoO 4 rose‐like and persimmon‐like structures were synthesized via microwave radiation‐assisted chelating agent method. The microstructure and morphology of the as‐prepared samples were analyzed by X‐ray diffraction and field‐emission scanning electron microscope. According to the experimental results, ethy…
Abstract Wurtzite ZnO nanonail structures have been grown on sapphire substrate by simple thermal evaporation of Zn powder in oxygen ambient. Growth parameters such as growth temperature and oxygen gas flow have been examined for the growth of nanonail structure. It is found that the nanonail structures repeatedly gro…
Ca 0.33 CoO 2 crystals have been prepared by a low-temperature ion-exchange technique from layered Na 0.50 CoO 2 precursor crystals and characterized by X-ray diffraction, magnetic susceptibility, and a b -plane thermoelectric property measurements. Ca 0.33 CoO 2 is isostructural to Na 0.50 CoO 2 with a layered triang…
The montmorillonite (MMT) surface was modified by 1,12 diaminododecane via cation exchange reaction in order to provide a chemical potential for MMT to react with polypropylene grafted maleic anhydride, PP-g-MA, compatibilizer. The Diamine modified nanoclay (DA) was then utilized to prepare PP based nanocomposite samp…
Silicon carbide nanofiber dispersion within a silicon oxycarbide glassy ceramic was achieved through a combination of a fast sol–gel procedure for in situ ceramic matrix synthesis and nanofiber conversion from sacrificial multiwalled carbon nanotube templates. Nanotubes were dispersed using both surfactant adsorption…
A real-space, real-time implementation of time-dependent density functional theory is used to study electron field emission from nanostructures. Carbon nanotubes and graphene nanoribbons are used as model systems. The calculations show that carbon nanotubes with iron adsorbates have spin-polarized emission currents. G…
Molecular dynamics simulations are performed to investigate the behavior of water molecules near gold monolayer protected clusters (MPCs) with two different types of surfactant, HS(CH(2))(5)(OCH(2)CH(2))(2)COOH (type1) and HS(CH(2))(11)COOH (type2). The effects of the different moieties of the two ligands on the local…
Nanocomposite materials based on bismuth telluride with fullerene additions have been synthesized via ball milling and spark plasma sintering. The impact of fullerene addition upon the composites is studied with respect to both fullerene volume percentage and ball-mill duration. It is demonstrated that fullerenes can…