Materials Literature
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Different physisorption properties by 2D and 3D isomers of $\mathrm{Au}_{n}{}^{\ensuremath{-}}$ clusters are observed and used to probe the 2D to 3D structural transition. Strong Ar clustering occurs on planar $\mathrm{Au}_{n}{}^{\ensuremath{-}}$ and the planar faces of the pyramidal $\mathrm{Au}_{20}{}^{\ensuremath{-…
Utilizing three-terminal tunnel emission of ballistic electrons and holes, we have developed a method to self-consistently measure the bandgap of semiconductors and band discontinuities at semiconductor heterojunctions without any prerequisite material parameter. Measurements are performed on lattice-matched GaAs/AlxG…
The magnetic and magnetocaloric properties of Ga1−xCMn3+x have been investigated. Reversible magnetocaloric effect (MCE) occurs near the Curie temperature TC. With increasing x, we find that the magnetic entropy change −ΔSM decreases while TC and magnetization increase. Meanwhile, the temperature span of −ΔSM versus T…
Here we show, with simultaneous transport and photoemission measurements, that the graphene terminated SiC(0001) surface undergoes a metal-insulator transition (MIT) upon dosingwith small amounts of atomic hydrogen. We find the room temperature resistance increases by about 4 orders of magnitude, a transition accompan…
Nanoscale lithography on SrRuO3 (SRO) thin film surfaces has been performed by scanning tunneling microscopy under ambient conditions. The depth of etched lines increases with increasing bias voltage but it does not change significantly by increasing the tunneling current. The dependence of line width on bias voltage…
Titanium dioxide (TiO2) nanocrystals were prepared by wet chemical method and characterized by x-ray diffraction (XRD), transmission electron microscopy (TEM), Raman scattering (RS) and photoluminescence (PL). The X-ray diffraction shows the formation of nanocrytalline TiO2 of average sizes 7 nm and 15 nm for two samp…
We calculate low-frequency Raman scattering from the confined acoustic phonon modes of CdS1-xSex nanoparticles embedded in borosilicate glass. The calculation of the Raman scattering by acoustic phonons in nanoparticles has been performed by using third-order perturbation theory. The deformation potential approximatio…
Low frequency acoustic vibration and phonon linewidth for CdTe0.68Se0.32 nanoparticle embedded in borosilicate glass are calculated using two different approaches by considering the elastic continuum model and fixed boundary condition. The presence of medium significantly affects the phonon peaks and results into the…
We report on the fabrication and electrical characterization of few-layer graphene (FLG) devices coated with a ferroelectric polymer layer of poly(vinylidene fluoride/trifluoroethylene) [P(VDF/TrFE)]. Highly stable and reliable resistance changes were observed under floating conditions, which were dependent on the bac…
The geometrical and mechanical properties and chemical composition of different basalt and glass fibers have been investigated. Tensile tests were performed on short basalt fiber made by melt blowing, glass fiber and three different types of continuous basalt fibers made by spinneret method. The chemical composition w…
Stoichiometric and nonstoichiometric (Bi0.5Na0.5)TiO3 (BNT) ceramics were prepared by a conventional ceramic fabrication process. This study revealed that the high conductivity of BNT ceramics is associated with Bi vaporization during sintering. An x-ray study revealed that a tetragonal phase exists in the temperature…
The scattering coefficients of a finite quasiperiodic Fibonacci sequence for the incident wave of perpendicular and parallel polarization are obtained using the matrix polynomials methods. The structure consists of isotropic layers and thick periodic grates of magnetodielectric bars. The grates are placed either ortho…
We present the microstructural evolution in Ge-rich ${\text{SiO}}_{2}$ doped with Er under different fabrication conditions. At sufficiently high Er contents and annealing temperatures, the ${\text{Er}}_{2}{\text{O}}_{3}$ and ${\text{Er}}_{2}{\text{Ge}}_{2}{\text{O}}_{7}$ phases are eventually formed, leading to an el…
Abstract A series of new organosoluble and optically transparent poly(ether imide)s (PEIs) were synthesized by the polycondensation of trifluoromethyl substituted and phthalimidine cardo group based bis(ether amine), 3,3‐bis‐[4‐{2′‐trifluoromethyl 4′‐(4″‐aminophenyl)phenoxy}phenyl]‐2‐phenyl‐2, 3‐dihydro‐isoindole‐1‐on…
Abstract The interfacial interaction and orientation of filler play important roles in the enhancement of mechanical performances for polymer/inorganic filler composites. Shear has been found to be a very effective way for the enhancement of interfacial interaction and orientation. In this work, we will report our rec…
Abstract Hydrogenated natural rubber (HNR) prepared from natural rubber (NR) is a new sustainable elastomer with excellent thermal properties. This study reports on the effect of vulcanization system and blend ratio on the thermal and oxidative resistance of HNR/NR vulcanizates. The various HNR/NR ratios vulcanized by…
Silica supports could constitute interesting stationary phases for the separation of biological substrates by affinity chromatography because of their better mechanical strength compared to polymers. Pore sizes and surface areas of the supports should be large enough (>70 nm) to provide high binding capacity and high…
Single-walled carbon nanotubes (SWCNTs) have been amidated by hydrothermal treatment with different aliphatic amines. The amido groups modified on the surface of the SWCNTs were characterized by Fourier transform infrared spectroscopy. The electrooxidation of nitric oxide (NO) at the modified electrodes of amidated SW…
Abstract Calcium–shellac microspheres with encapsulated carbamide peroxide (CP) were made by emulsification to generate an emulsion including shellac ammonium salt aqueous solution with soluble CP dispersed in sunflower oil with calcium chloride powders, followed by gelation between shellac and calcium. The effects of…
The generation and conduction of photoelectrons in ligated metallic Au NPs are demonstrated, and their key factors include tunneling of photoexcited electrons, the close packing of the NP network, and increased photoelectron-to-intrinsic electron ratio associated with ligand passivation. In view of their inherent char…