Materials Literature
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Abstract Polyurethane (PU) nanocomposites were prepared through conventional and in situ methods with multiwalled carbon nanotubes (MWNTs) functionalized with poly(ϵ‐caprolactone). The thermal degradation and stability of PU–MWNT nanocomposites were investigated with nonisothermal thermogravimetry and were explained i…
Abstract The thermal degradation behavior of meta- and para-aramid fibers (PMIA and PPTA) in different atmospheres was studied by thermogravimetric analysis coupled with mass spectrometry (TGA-DTA/MS). The process of mass loss in the degradation of PMIA was divided into three steps in both argon and air. The mass loss…
Abstract Rigid monoliths were prepared from concentrated oil in water (O/W) emulsions by a base‐catalyzed polycondensation reaction of 2‐nitroresorcinol with cyanuric chloride. Mercury intrusion/extrusion porosimetry confirmed that the obtained monoliths were porous with an open porosity. However, scanning electron mi…
The authors have studied the substrate-induced strain effect in La0.875Ba0.125MnO3 (LBMO) thin films grown on ferroelectric 0.67Pb(Mg1∕3Nb2∕3)O3–0.33PbTiO3 (PMN-PT) single-crystal substrates. Both the strain and resistance of the films can be in situ varied by applying an electric field across the PMN-PT substrates. X…
The authors demonstrate amplified spontaneous emission (ASE) from quaterthiophene single crystals and study its behavior at low temperature. The room temperature photoluminescence exhibits line narrowing (spectral width down to 10nm) at 553nm for excitation fluence larger than 1mJcm−2. At low temperature (10K), ASE is…
Abstract Poly(3,4‐ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS) is a widely used conductive aqueous dispersion synthesized by using emulsion polymerization method. To further enhance its solution processability and conductivity of PEDOT derivatives, we proposed to replace the nonconductive PSS with condu…
We have studied the structural phase transition of solid solutions (x)Bi(Zn1∕2Ti1∕2)O3–(1−x)PbTiO3. The temperature evolution of the x-ray diffraction patterns of the θ-2θ scans around {110} has been performed to check the structural phase transitions: The (101)∕(011) peak shifts to a larger value, while the (110) pea…
We have carried out a band-resolved analysis of the optical absorption spectra of structural disorder in ${\text{SiO}}_{2}$ glass by using a first-principles method, where dominant orbitals involved in the absorption spectra can be analyzed. We provided a strong theoretical support to a model where heavily strained bo…
Abstract We report a metamaterial with optically isotropic negative refraction index, n , and small loss factor, k = |Im ( n )/Re ( n )| ≤ 0.4, that occurs near the visible/UV line. The metamaterial presented consists of two media. One medium (randomly distributed gold spherical nanoparticles with Drude‐like permittiv…
Air/vacuum dielectric organic field-effect transistors (OFETs) based on submicrometer-size copper-hexadecafluorophthalocyanine single crystalline ribbon were fabricated and characterized. The n-type OFETs showed high performance with the electron mobility at ∼0.35cm2V−1s−1 and on/off ratio at >3×105, respective…
We investigate numerically the effect of an applied electric field on the physics of cholesteric cubic blue phases. The full hydrodynamic equations of motion are solved via a lattice Boltzmann algorithm which leads to an exact minimisation of the Landau-de Gennes free energy in steady state. This technique is able to…
The temperature–field phase diagrams are discussed within the Landau theory for perovskite-type ferroelectrics, which undergo successive transitions of first order. The sequences of the cubic–tetragonal–orthorhombic–rhombohedral phases and the cubic–rhombohedral–orthorhombic–tetragonal phases are considered, and the f…
Abstract Starch‐based loose‐fill packaging foams were made in a single‐screw laboratory‐scale extruder. Corn starch was blended with polystyrene in the ratio of 70 : 30 and extruded into foams using talc and polycarbonate as additives. Extrusions were carried out at moisture contents of 16, 18 and 20% (dry basis), and…
By combining Raman scattering from the cleaved edge and under hydrostatic pressure, we have accurately determined the tetragonal phonon deformation potentials of strained Si1−xGex alloys in the entire compositional range for the Ge-like, Si-like, and mixed Si–Ge optical modes. A known biaxial strain is induced on thin…
The finite-temperature magnetism of Ni and permalloy in body-centered-cubic (bcc) and face-centered-cubic (fcc) phases is studied theoretically using ab initio supercell calculations and Green's function methods. The results confirm and explain the general experimental trend that the fcc phases have higher Curie tempe…
Patterned all-graphene circuits, in which semiconducting graphene nanoribbon (GNR) device channels are connected by metallic GNR interconnects, raise possibilities for carbon-based electronics. The properties of GNR metal-semiconductor junctions, which are the key elements in all-graphene circuits, are studied by atom…
Abstract Highly porous elastomeric nanocomposites were successfully synthesized through copolymerization of 2‐ethylhexyl acrylate (EHA), divinyl benzene (DVB), and up to 9 mol % of a polyhedral oligomeric silsesquioxane bearing one propylmethacryl group and seven cyclohexyl groups (MACH‐POSS) within the external phase…
We have studied structure formation in a confined block copolymer melt by means of dynamic density functional theory. The confinement is two dimensional, and the confined geometry is that of a cylindrical nanopore. Although the results of this study are general, our coarse-grained molecular model is inspired by an exp…
Star-shaped mesogens with a phloroglucinol or a trimesic acid core and oligobenzoate arms with up to five repeating units have been synthesised. These non-conventional mesogens form various columnar mesophases over a broad temperature range. The liquid-crystal phases were characterised by optical microscopy, different…
We measure the dependence of the interparticle force F on the distance R between two colloidal particles with hyperbolic hedgehog defects in a nematic liquid crystal using optical tweezers. The particle-defect pair can be regarded as an elastic "dipole" in the electrostatic analogy. In a parallel configuration, where…