Materials Literature
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We show the ferroelectric switching of a thin film of the copolymer of 60 mol% vinylidene fluoride and 40 mol% trifluoroethylene when it is subjected to a sinusoidal electric field from 10 Hz to 100 kHz using a conductive probe chip of AFM. A switching speed of 1.6 ×106 s-1 (switching time of 660 ns) was measured at 1…
P-type CuGaO2films have been fabricated on silicon substrates by the sol–gel method. The stable sol solutions for CuGaO2growth were developed by the mixing of Cu–O and Ga–O sol solutions using copper(II) acetate monohydrate and tris(acetylacetonato) gallium(III), respectively. Phase separation in CuGaO2films depends o…
Using first-principles calculations, we investigate the structures and properties of stereo triwing boron nitride nanoribbons (TBNNRs). These triwing structures are constructed by three BN ribbon wings connected via the junctions, which have comparable thermodynamic stabilities to the planar nanoribbons. We find that…
We propose an ellipsoid-chain model which may be routinely parameterized to capture large-scale properties of semiflexible, amphiphilic conjugated polymers in various solvent media. The model naturally utilizes the defect locations as pivotal centers connecting adjacent ellipsoids (each currently representing ten mono…
Giant negative thermal expansion in antiperovskite manganese nitrides Mn3AN (A = Zn, Ga, etc.) is achieved by substituting Ge for A as a “relaxant” to the sharp volume change associated with the magnetic transition. We have studied the effects of nitrogen deficiency on the broadening of volume change. Although the bro…
The electronic structure and magnetic properties of nitrogen or carbon doped zinc oxide are studied by using ab initio calculation, where the electronic correlation in anion p-orbitals are enhanced by adding the on-site Coulomb repulsion. The calculation shows that the enhanced electronic correlation can result in an…
The diffusion of charged particles interacting through a repulsive Yukawa potential, exp(-r/λ)/r, confined by a parabolic potential in the y direction and subjected to a periodic substrate potential in the x direction is investigated. Langevin dynamic simulations are used to investigate the effect of the particle dens…
Acrylonitrile was successfully grafted on polystyrene modified with activated carbon using gamma-irradiation technique. This process was carried out modified at various gamma dose (0.2 to 1.5 Mrad). The new grafted polymer (GP) was characterized and its properties were investigated. In this study, it was found that 2…
Abstract Nanographene, nanosized fragments of graphene, has edge-shape-dependent electronic structures different from those of infinite size graphene. Around the zigzag-shaped edges of a nanographene sheet, a nonbonding edge state of π-electron origin is created, which is the origin of electronic and chemical activiti…
Layered cobaltates LnxCoO2 (Ln = La, Pr, Nd; x ∼ 0.30), isostructural with well known thermoelectrics NaxCoO2, have been characterized by diffraction methods and probed by the electric transport, magnetic and heat capacity measurements. The thermopower increases with temperature and saturates above room temperature at…
By using non-equilibrium Green's functions in combination with the density-functional theory, we study the effect of zigzag graphene nanoribbons with edge hydrogenation and oxidation on transport properties. We find that for the ferromagnetic (FM) configuration the ZGNRs with CH2-CH group exhibit spin diode effect in…
In this work, we analyze the origins of the observed differences between the radiation sensitivities of fluorine-doped optical fibers made with different fabrication processes. We used several experimental techniques, coupling in situ radiation-induced absorption measurements with post mortem confocal microscopy lumin…
Rare earth borates are important due to their excellent properties, especially for optics. Here, we report the hydrothermal synthesis and structural determination by single-crystal X-ray diffraction of two new samarium polyborates with layered structures, being constituted by hexaborate chains. These hexaborate chains…
First-principles calculations are carried out to understand the structural stability and electronic properties of 1-D condensed clusters and their fundamental building blocks, Cd n S n ( n = 1–6) small clusters. By linear stacking of these stable isomers, the condensed clusters, (Cd n S n ) m, where n = 1–4 and m = 1–…
Abstract Novel electrochromic polymers were prepared by the click postfunctionalization of poly(4‐azidomethylstyrene) with alkyne‐containing aromatic amine units in the presence of Cu(I) catalysts. Two kinds of aromatic amine units, tris(4‐alkoxyphenyl)amine and N,N,N′,N′‐tetraphenyl‐p‐phenylenediamine, were introduce…
The synthesis of a highly crystalline graphite-like new material with an interlayer separation of 2.8 Å is demonstrated by re-stacking GO sheets in the form of a thin film. The optical absorption spectra and electrical data indicate that the new crystal phase is an indirect zero gap semiconductor.
PLA MPs are prepared via a novel and toxic-chemical-free fabrication route using ethyl lactate, a green solvent and FDA-approved aroma. MPs are obtained by a solution jet break-up and solvent displacement method. Adjusting flow parameters allows the tuning of MPs size between 60 and 180 µm, with reduced polydispersity…
As a weak base, β-glycerophosphate (β-GP) was used to spontaneously initiate gelation of quaternized cellulose (QC) solutions at body temperature. The QC/β-GP solutions are flowable below or at room temperature but gel rapidly under physiological conditions. In order to clarify the sol-gel transition process of the QC…
The syntheses and photophysical/photochemical properties of two amide-tethered coumarin-labeled nicotinamides are described. Photochemical studies of 6-bromo-7-hydroxycoumarin-4-ylmethylnicotinamide (BHC-nicotinamide) revealed an unexpected solvent effect. This result is rationalized by computational studies of the di…
This work presents results on the sorption of the azo dyes Remazol Yellow GR110 and Remazol Golden Yellow RNL onto calcined MgAl-CO3 hydrotalcite under different pH (7 and 11) and temperature (25°C and 40°C) conditions. In addition to isotherm and kinetic data, this work also shows results on two techniques (thermal a…