Materials Literature
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The structures of poly(2-(2-ethoxy)ethoxyethyl vinyl ether)-block-poly(2-methoxyethyl vinyl ether) in D2O have been investigated with small-angle neutron scattering (SANS) as a function of temperature T and pressure P. At ambient pressure, the solution underwent a two-step transition at 40 and 65 degrees C, both of wh…
Abstract Summary: The morphologies and conformations of triblock copolymer (ABA and ABC) thin films confined between two identical walls were investigated by Monte Carlo simulation using bond length fluctuation and cavity diffusion algorithm on cubic lattice. Effects of the wall‐block interactions, copolymer chain com…
A template synthesis of the soluble, high molecular weight (Mw), and perfect p-phenylenediimino (p-PDA)-bridged ladderlike polyphenylsiloxane (PLPS) is reported. First, N,N'-bis(phenyldichlorosilyl)-p-PDA monomers were self-assembled into a perfect ladder superstructure (LS) by concerted interaction of aromatic pi-pi…
Self-assembly of designed peptides is a promising area of biomaterials research and development. Here, polypeptide nanofilms have been prepared by electrostatic layer-by-layer self-assembly (LBL) of cysteine (Cys)-containing 32mers designed to be oppositely charged at neutral pH, and structural stability of the films…
Specific synthesis of a series of Ir-containing homo- and heterodinuclear complexes with the PNNP (3,5-bis((diphenylphosphino)methyl)pyrazolato) and PNNN ligands (3-(diphenylphosphino)methyl-5-pyridylpyrazolato) is reported. Reaction of the PNNX-H precursors (X = P, N) with [Ir(cod) 2 ]BF 4 gives pale yellow precipita…
'Photokinetics under Continuous Irradiation' published in 'Organic Photochromic and Thermochromic Compounds'
La 0.7 Sr 0.3 Mn 1− x Ti x O 3 films (0 ⩽ x ⩽ 0.5) were fabricated using chemical solution deposition. It was found that with an increase in Ti content, the lattice constant was first increased due to the substitution of Mn 4+ with Ti 4+ , and then it tended to decrease when x ⩾ 0.3 due to the substitution of Mn 3 + b…
Copolymers of N-acryloyl-m-aminophenylboronic acid (NAAPBA) with acryamide (AA), N,N-dimethylacrylamide (DMAA), and N-isopropylacrylamide (NIPAM) were found to adsorb on cross-linked agarose gel (Sepharose CL-6B) in the pH range from 7.5-9.2, due to specific boronate-sugar interactions. The molar percentages of phenyl…
A method for in situ monitoring of surface and gas species utilizing separately the difference and sum reflectivity of two polarizations, normal and parallel to the surface, measured by polarization-modulation infrared reflection-absorption spectroscopy is presented. Surface and gas-phase spectra were separately but s…
The static dielectric constant of isolated silicon nanocrystals (nc-Si) embedded in a SiO2 thin film synthesized by Si+ implantation has been determined from capacitance measurement based on the Maxwell–Garnett effective medium approximation and the stopping and range of ions in matter simulation. For the nc-Si with a…
A theoretical model is suggested that describes the generation of partial and split dislocations at grain boundaries in nanocrystalline metals. The ranges of parameters (such as grain size and level of external stress) are theoretically revealed at which the formation of partial dislocation semi-loops is energetically…
We examine the dynamics of acid and methylated precursors to sulfonated polystyrene ionomers. Dielectric relaxation spectroscopy was the primary tool used in the investigation of the dynamics, and dynamic mechanical analysis, Fourier transform infrared spectroscopy, and differential scanning calorimetry were employed…
Abstract Well‐defined poly( L ‐lactide)‐ b ‐poly(ethylene oxide) (PLLA‐ b ‐PEO) copolymers with different branch arms were synthesized via the controlled ring‐opening polymerization of L ‐lactide followed by a coupling reaction with carboxyl‐terminated poly(ethylene oxide) (PEO); these copolymers included both star‐sh…
In this letter, a first-principles study of the anisotropic thermal expansion of wurtzite ZnS in the framework of the density-functional theory and the density-functional perturbation theory is reported. The compound in zinc blende structure is also studied for comparison. The curves of the linear and volume thermal e…
We report that measurements of the Raman intensity versus applied voltage are sensitive to filling of the density of states and enable us to measure the second band gap in specific semiconducting single-walled carbon nanotubes (SWNTs). Raman scattering preferentially selects sets of SWNTs whose excitonic transitions a…
The effect of uniaxial compressive pre-stress on the ferroelectric properties of commercial soft PZT ceramics is investigated. The ferroelectric properties under the uniaxial compressive pre-stress of the ceramics are observed at stress up to 24 MPa using a compressometer in conjunction with a modified Sawyer–Tower ci…
A novel class of photochromic materials based on polar azo derivatives containing functionalized biphenyl substituents has been synthesized. Once melt and cooled, these compounds formed amorphous transparent monomeric materials whose glass transition temperatures depend mainly on the bulkiness of the biphenyl substitu…
Pb 2 MnWO 6 has been synthesized and its structure determined by powder x-ray diffraction. This sample undergoes a first order structural phase transition at ∼445 K. This transition is coupled to a change in the electrical properties manifested by a sharp discontinuity of the dielectric permittivity at the phase trans…
X-ray diffraction and differential scanning calorimetric studies were performed on bulk Sn–Sb–Se chalcogenide alloys, which were obtained by the conventional melt quenching technique. The addition of Sn reduces the crystalline nature of Sb20Se80 chalcogenide alloy and amorphous samples are obtained for a-SnxSb20Se80−x…
We report on the growth of uniquely shaped ZnO nanowires with high surface area and patterned over large areas by using a poly(dimethylsiloxane) (PDMS) microfluidic channel technique. The synthesis uses first a patterned seed template fabricated by zinc acetate solution flowing though a microfluidic channel and then g…