Materials Literature
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In this work, a superhydrophilic polypyrrole (PPy) nanofiber network is electrochemically synthesized in an aqueous solution by using phosphate buffer solution (PBS) in the absence of templates, surfactants and structure-directing molecules. FESEM, X-ray diffraction, UV−visible absorption, and contact angle measuremen…
Giant dielectric permittivity (Li, Ti)-doped NiO (LTNO) ceramics are prepared by a simple PVA sol–gel method. The dielectric properties are investigated as a function of frequency (10 2 –10 6 Hz) at different temperatures (233–473 K). The concentration of Li has a remarkable effect on the dielectric properties of the…
First-principles calculations show that the electronic structure of graphene on ${\text{SiO}}_{2}$ strongly depends on the surface polarity and interface geometry. Surface dangling bonds mediate the coupling to graphene and can induce hole or electron doping via charge transfer even in the absence of extrinsic impurit…
A newly developed fast molecular dynamics method is applied to ${\text{BaTiO}}_{3}$ ferroelectric thin-film capacitors with short-circuited electrodes or under applied voltage. The molecular dynamics simulations based on a first-principles effective Hamiltonian clarify that dead layers (or passive layers) between ferr…
An effort is made to study the contrast in magnetic behavior resulting from minimal disorder introduced by substitution of 2.5% Ga or Al in Mn-site of La${_{0.9}}$Sr$_{0.1}$MnO${_3}$. It is considered that Ga or Al selectively creates disorder within the orbital domains or on its walls, causing enhancement of Griffith…
We report neutron inelastic scattering and high-resolution x-ray diffraction measurements on single crystal $0.68\text{Pb}({\text{Mg}}_{1/3}{\text{Nb}}_{2/3}{\text{O}}_{3})\text{\ensuremath{-}}0.32{\text{PbTiO}}_{3}$ (PMN-0.32PT), a relaxor ferroelectric material that lies within the compositional range of the morphot…
Critical curves "critical current - external magnetic field" of long Josephson junctions with inhomogeneity and variable width are studied. We demonstrate the existence of the regions of magnetic field where some fluxon states are stable only, if the external current through the junction is different from zero. Positi…
Dual responsive molecular brushes consisting of statistical copolymers of di(ethylene glycol) methyl ether methacrylate (MEO 2 MA) and either methacrylic acid (MAA) or N,N -dimethylaminoethyl methacrylate (DMAEMA) were synthesized by grafting from poly(2-(2-bromoisobutyroyloxy)ethyl methacrylate (PBIEM) macroinitiator…
The effect of cobalt and nickel substitutions for manganese on the physical properties of the perovskite manganite La1.2Bi0.8Mn2-x(Ni/Co)xO6+d, with x = 0.0-0.8, has been investigated. It is observed that the ferromagnetism is enhanced, TC being increased from 103 K for the parent compound (x = 0.0) to 178 K for Ni-ph…
Using a combination of vertical transport measurements across and lateral transport measurements along the LaAlO$_{3}$/SrTiO$_{3}$ heterointerface, we demonstrate that significant potential barrier lowering and band bending are the cause of interfacial metallicity. Barrier lowering and enhanced band bending extends ov…
The coupling with the lattice vibrations is shown to drastically modify the state-of-the-art picture of the excitonic states based on a frozen-atom approximation. The zero-point vibrations renormalize the bare energies and optical strengths. Excitons acquire a nonradiative lifetime that decreases with increasing tempe…
The pharmaceutical co-crystal approach has been introduced recently to address poor physicochemical properties of new chemical entities. In this study we prepared and investigated ten co-crystals of AMG 517. Based on thermal analysis, 1 H NMR and p K a values we have prepared co-crystals rather than solvates or salts.…
Direct measurement of the remanent polarization of high quality (001)-oriented epitaxial BiFeO3 thin films shows a strong strain dependence, even larger than conventional (001)-oriented PbTiO3 films. Thermodynamic analysis reveals that a strain-induced polarization rotation mechanism is responsible for the large chang…
In this paper, we report the assembly of single-walled carbon nanotubes (SWNTs) and single-stranded DNA to develop a new class of fluorescent biosensors which are able to probe and recognize biomolecular interactions in a homogeneous format. This novel sensing platform consists of a structure formed by the interaction…
This paper reports a novel static method to fabricate three-dimensional (3D) fibrous tubes composed of ultrafine electrospun fibers. By using this unique technique, micro and macro single tubes with multiple micropatterns, multiple interconnected tubes, and many tubes with the same or different sizes, shapes, structur…
Access to excited-state structures and dynamics of pi-chromophor aggregates is needed to understand their fluorescence behavior and the properties of related materials. A quantum-chemistry-based protocol that provides quantitative and qualitative insight into fluorescence spectra has been applied to perylene bisimide…
Phthalocyanines and porphyrins are versatile functional pigments with a wide range of applications. These macrocyclic compounds contain four isoindole or pyrrole nitrogen atoms, which can complex with a range of metal ions. Large rare earth metal ions can bring together these tetrapyrrole derivatives to form sandwich-…
We perform electrical transport measurements in graphene with several sample geometries. In particular, we design ``invasive'' probes crossing the whole graphene sheet as well as ``external'' probes connected through graphene side arms. The four-probe conductance measured between external probes varies linearly with c…
Abstract Poly(3‐hydroxybutyrate‐ co ‐3‐hydroxyhexanoate) (PHBHHx) is a thermoplastic biopolyester with a slow crystallization rate. L ‐Phenylalanine ( L ‐PH) was used to improve the crystallization rate of PHBHHx. The nonisothermal crystallization kinetics and melting behaviors of PHBHHx and PHBHHx/ L ‐PH samples were…
We have investigated backflow and dynamic behavior of a homogeneously aligned liquid crystal cell in the modulated electric field. We quantitatively describe the dynamic behavior of director, flow velocity, and fluid displacement. The numerical calculation shows the whole dynamic process of director and flow in the mo…