Materials Literature
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Abstract A novel diatomite composite superabsorbent was synthesized by solution polymerization of partially neutralized acrylic acid and diatomite, using N,N′‐methylenebisacrylamide as a crosslinking agent and hydrogen peroxide and L ‐ascorbic acid as a redox initial system. The influences of some reaction conditions,…
Using density functional theory we studied systematically a Au atom adsorption on a Mo-supported regular and defected ultrathin MgO film with 1 to 5 ML thickness. On Mo(100) grown regular MgO Au prefers to adsorb at a hollow site instead of an O site found for single-crystal MgO. The metal support also enhances Au ads…
A bifunctionalized polyelectrolyte multilayer film (PEM film) that can drive embryonic stem cells to cartilage or bone differentiation is presented. A model system is constructed from a PEM film into which transforming growth factor β1 and bone morphogenetic protein has been embedded. The synergy between both factors…
We report the fabrication of microporous thin film membranes with two-dimensionally arranged submicron pores whose size can be varied by changing pH of aqueous medium. A solution containing poly(2-vinylpyridine) partially quaternized with 1,4-diiodobutane (qP2VP) and unreacted 1,4-diodobutane (DIB) was used for the fo…
We report a joint theoretical and experimental study of low-lying structures and structural transitions of gold cluster anions Au n - in the size range of n = 21−25. Well-resolved photoelectron spectra are used to compare with density functional theory calculations and to identify the low-lying structures of the gold…
Abstract The silicone rubber with good thermal conductivity and electrical insulation was obtained by taking vinyl endblocked polymethylsiloxane as basic gum and thermally conductive, but electrically insulating hybrid Al 2 O 3 powder as fillers. The effects of the amount of Al 2 O 3 on the thermal conductivity, coeff…
Walls that build themselves: Long-range nanowalls assemble with uniform tetragonal Mn3O4 nanoparticles by a simple solution-phase synthesis method under low temperature and surfactant-free conditions (see image). The magnetization of the sample is investigated. A mechanism for formation of the wall-like crystals is su…
We have systematically investigated the phase diagram of clay particles in water to understand the relation between the local and macroscopic properties and the structures of clay suspensions. We focused, in particular, on sodium Cloisite (CNa) particles at concentrations typically used in nanocomposites (concentratio…
Prompted by our interest in new photochromic organic-inorganic hybrid materials, the reactivity of [Mo7O24]6- toward a structure-directing reagent diamine such as 1,4-diazabicyclo[2.2.2]octane (DABCO) and piperazine (pipz) has been investigated, and three new molybdenum(VI)-containing compounds, namely, (H2DABCO)3[Mo7…
The dielectric response of various series of cross-linked and non-cross-linked solution-styrene-butadiene-rubber and/or carbon black composites is investigated in the frequency range from $0.1\phantom{\rule{0.3em}{0ex}}\mathrm{Hz}$ up to $10\phantom{\rule{0.3em}{0ex}}\mathrm{MHz}$. Two types of rubber, differing in vi…
La2Mo2O9 (LAMOX) is a fast oxygen ion conductor which shows high oxygen ion conductivities comparable to those of yttria-sabilized zirconia (YSZ) . LAMOX is subject to a structural phase transition from the non-conductive monoclinic form to the highly-conductive cubic form at about 580C. The origin of the conductivity…
Using single-particle pseudopotential and many-particle configuration interaction methods, we compare various physical quantities of (In,Ga)As/GaAs quantum dot molecules (QDMs) made of dissimilar dots (heteropolar QDMs) with QDMs made of identical dots (homopolar QDMs). The calculations show that the electronic struct…
We report on the direct visualization of chirality changes in carbon nanotubes by mapping local changes in resonant RBM phonon frequencies with an optical resolution of 40 nm using near-field Raman spectroscopy. We observe the transition from semiconducting-to-metal and metal-to-metal chiralities at the single nanotub…
A direct and environmentally friendly synthesis method was developed to produce aqueous CdS quantum dots (QDs) at room temperature. The transmission electron microscopy (TEM) and X-ray diffraction (XRD) results showed the small size and the cubic zinc blende structure of the nanocrystals. The quantum yield was compara…
A Dy(III)4Mn(III)6 complex with a metallacrown (MC)-like topology possesses frequency-dependent magnetic behavior, indicating possible single-molecule magnet behavior.
We study the ground state properties of classical Coulomb charges interacting with a 1/r potential moving on a plane but confined either by a circular hard wall boundary or by a harmonic potential. The charge density in the continuum limit is determined analytically and is non-uniform. Because of the non-uniform densi…
Crystalline acetanilide is a an organic solid with peptide bond structure similar to that of proteins. Two states appear in the amide I spectral region having drastically different properties: one is strongly temperature dependent and disappears at high temperatures while the other is stable at all temperatures. Exper…
An efficient modified arc plasma method, where a focusing electric field is superimposed on the arc electric field, is optimized for the bulk generation of highly pure multi-walled carbon nanotubes. Raman spectroscopy and thermogravimetric measurements have been used to optimize the process.
We present a theoretical discussion of a self-assembly scheme which makes it possible to use DNA to uniquely encode the composition and structure of micro- and nanoparticle clusters. These anisotropic DNA-decorated clusters can be further used as building blocks for hierarchical self-assembly of larger structures. We…
We present a general scheme for treating the integrable singular terms within exact exchange (EXX) Kohn-Sham or Hartree-Fock (HF) methods for periodic solids. We show that the singularity corrections for treating these divergencies depend only on the total number and the positions of k-points and on the lattice vector…