Materials Literature
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Shear localization in an aqueous clay suspension of Laponite is investigated through dynamic light scattering, which provides access both to the dynamics of the system (homodyne mode) and to the local velocity profile (heterodyne mode). When shear bands form, a relaxation of the dynamics typical of a gel phase is obse…
Abstract We report on angle‐resolved reflection‐type generalized ellipsometry investigations of form‐birefringent chiral silicon sculptured thin films. The nanodimensional structures within the sculptured thin films are designed in geometries of left‐handed hollow‐core three‐, four‐, and five‐fold, and solid‐core cont…
There is a strong interest in the use of conductive shape memory polymer (SMP) for actuation by passing an electrical current. This paper presents a systematic study on the effect of multi-walled carbon nanotubes (MWCNTs) and carbon nanoparticles on the electro activate shape memory polymer (SMP). The first is the fab…
Thin films of SiO x ( x = 1.15, d = 1 and 2 µm), deposited by thermal vacuum evaporation of SiO on n- and p-type crystalline Si or quartz substrates, and then furnace annealed at 250, 700 and 1000 °C, are studied. Optical and infrared transmission measurements prove phase separation upon annealing at 700 and 1000 °C a…
Abstract Organic thin films frequently exhibit strong anisotropic optical constants, which in many cases are uniaxial with the optic axis oriented along the surface normal. The data analysis presented here to obtain the anisotropic optical constants of thin films on silicon substrates is based on the model system diin…
Periodic arrays of nanorings of morphotropic phase boundary lead zirconium titanate (PZT) have been successfully fabricated using a novel self-assembly technique: close-packed monolayers of latex nanospheres were deposited onto Pt-coated silicon substrates, and then plasma cleaned to form ordered arrays of isolated na…
Hierarchical core/shell PbWO 4 /WO 3 microcrystals were subjected to convergent electron beam irradiation in a 300 kV transmission electron microscope, and W 18 O 49 nanowires can be rapidly produced within 5 s irradiation. It was found that the produced W 18 O 49 nanowires are single crystals with monoclinic structur…
There are two general mechanisms of devitrification in glass: heterogeneous nucleation of crystals from surfaces and impurities and homogeneous nucleation from the volume. It is thought that structural similarities between glass and crystal at the intermediate-range level influence the mechanism followed; however, the…
Abstract Spectroscopic ellipsometry (SE) is applied to characterize Si columnar nanostructures. By employing effective medium approximation (EMA) theory, Si nanorods are treated as a graded layer with each sub‐layer modeled as a mixture of Si and voids with varying porosity fraction. In addition, the rigorous coupled‐…
Abstract The differential reflection of p‐ and s‐polarized light by interfaces and thin films is central to the theory and applications of ellipsometry. It is also the basis of a wide variety of optical devices for the control and analysis of polarized light such as polarizers, polarizing and polarization‐preserving b…
We report the effect of stacking fault on the formation of the saw-teeth of ZnS nanosaws, which were synthesized by a hydrogen-assisted thermal evaporation method. The stem of ZnS nanosaw grows along the [101̅0] direction and possesses wurtzite (WZ) structure, while the saw-tooth grows along the [111] direction and po…
Abstract This study reports on the effect of gamma radiation on morphological, thermal, and water barrier properties of pure ethylene vinyl alcohol copolymers (EVOH29 and EVOH44) and its biocomposites with the nanofiller microfibrillated cellulose (2 wt %). Added microfibrillated cellulose (MFC) preserved the transpar…
Three novel series of triphenylene-based derivatives possessing functional group (ester, carboxylic acid, or hydroxy) at the ends of two aliphatic chains on the opposite position of triphenylene core have been synthesized and studied on mesomorphic properties. Their chemical structures were characterized by FT-IR, 1H-…
Highly functionalized fluorinated porphyrins were synthesized by a convergent strategy. Nucleophilic substitution using fluorinated branched unit and 5,10,15,20-tetrakis(pentafluorophenyl)porphyrin afforded highly functionalized fluorinated porphyrin 8 containing 24 fluorinated chains in the peripheral region.
A novel mechanism of carbon black network formation in a binary immiscible rubber blend has been proposed in this paper. The network formation implies that the specific rubber molecules are selectively confined into the void of carbon black aggregate structure during their solution mixing. The selective adsorption and…
The adsorption of acetate species (CH 3 COO - ) on the Ag/ Al 2 O 3 catalyst has been studied using in situ diffuse reflectance infrared Fourier transform spectroscopy and Density functional theory (DFT). The geometrical structures and vibrational spectra were obtained at the PBE1PBE level of DFT and compared with the…
Classically, there have been two different ways to obtain mean-field theories for liquid crystals. One is based on short-range repulsive steric forces and the other on long-range attractive dispersion forces. In the former approach, it is the anisotropic shape of the molecules that leads to the anisotropic interaction…
The unoccupied electronic states of $\mathrm{La}\mathrm{Co}{\mathrm{O}}_{3}$ and $\mathrm{Pr}\mathrm{Co}{\mathrm{O}}_{3}$ are studied using room temperature inverse photoemission spectroscopy and ab initio $\mathrm{GGA}+U$ band structure calculations. A fairly good agreement between experiment and theory is obtained.…
Abstract The adhesion properties, i.e. viscosity, tack, and peel strength of pressure‐sensitive adhesives prepared from natural rubber/epoxidized natural rubber blends were investigated using coumarone‐indene resin and toluene as the tackifier and solvent respectively. One grade of natural rubber (SMR 10) and two grad…
Abstract Cs 2 Hg 27 , the Mercury‐richest Amalgam with Close Relationship to the Bergman Phases By electrolyzing a solution of cesium iodide in N,N‐dimethylformamide at 2 °C on a mercury cathode the amalgam Cs 2 Hg 27 can be synthesized. It crystallizes in an own cubic structure type (space group $Im{\bar 3}$ , a = 16…