Materials Literature
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Ionomers are polymers with bonded ionic species that are used under conditions where the salt groups are in a condensed state. This Feature Article discusses the state of our understanding of ionomers and the historical applications of these nanostructured polymers. It also discusses modern methods for synthesizing ne…
In this work, the optical properties of carbon nanoparticles (CNPs) can be modulated by the dopant‐N atom and sp2 C‐contents. CNPs prepared with the low urea mass ratio of 0.2:1 (CNP1) exhibit blue emission (maximum PL quantum yield: 15%). Increasing sp2 C‐ and dopant‐N atom contents, as determined in CNPs prepared wi…
Solar cell substrates require high optical transparency but also prefer high optical haze to increase the light scattering and consequently the absorption in the active materials. Unfortunately, there is a trade-off between these optical properties, which is exemplified by common transparent paper substrates exhibitin…
Piezoelectric polymer, poly (vinylidene fluoride), PVDF is a widely used fluorocarbon polymer with varied range of applications. PVDF is known to exhibits scientifically interesting and technologically important electrical properties due to their polar structure. When it is subjected to mechanical deformation, it beco…
Novel X-type polyurethane 4 containing 4-(4-nitrophenylazo)-6-nitroresorcinoxy groups as nonlinear optical (NLO) chromophores, which are parts of the polymer main chains, was prepared and characterized. Polyurethane 4 is soluble in common organic solvents such as acetone and N,N-dimethylformamide. It shows thermal sta…
ZnO films were deposited onto glass, ITO coated glass, and sapphire substrate by spray pyrolysis, and subsequently annealed at the same temperature of 400°C for 3 h. The role of substrate on the properties of ZnO films was investigated. The structural and optical properties of the films were investigated by X-ray diff…
Around the globe, several researchers are exploring in the area of potential use of biodegradable polymeric as carriers for a wide range therapeutic applications. In the past two decades, a considerable progress has been made in the development of biodegradable polymeric materials mainly in biomedical and pharmaceutic…
The formation of a ring area around the cavitation erosion pit on carbon steel is due to the cavitation erosion–corrosion. For the ultrasonic irradiation in water, both the ultrasonic cavitation and the acoustic streaming are generated. Due to the oscillation of the horn, the acoustic streaming flows from the tip of t…
Geometries, IR and Raman spectra, nucleus independent chemical shifts, and static electronic (hyper)polarizabilities of the equilibrium conformations of 2,2′-biselenophene were determined in vacuum using density functional theory (DFT) computations. At the DFT-PBE0/6-31G+pdd′ level the antigauche structure characteriz…
The structure and growth of molecular NaCl crystals in bulk and in a narrow, nanometer-sized apolar confinement are examined by explicit-water molecular dynamics computer simulations. It is demonstrated that fast crystallization and subsequent diffusion-controlled cluster growth in bulk is triggered by supersaturation…
We study the influence of different thermal treatments and pulsed laser irradiation on the temperature dependence of resistance and activation energy of ceramic samples of copper oxide. For studies of influence of impurity, thin film of silver was deposited on some samples prior to laser action. It is revealed that th…
Finite element modelling of steady state creep process has been described. Using an analogy of visco-plastic problem with a described procedure, the finite element method has been used to calculate steady state stresses and strains in 2D problems. An example of application of such a procedure have been presented, usin…
The full color greenish-white-emitting phosphors Eu 2+ -doped Sr 3 Bi(PO 4 ) 3 have been successfully synthesized by the conventional solid-state reaction, and its photoluminescence properties have been investigated for the first time. The emission spectra of Sr 3 Bi(PO 4 ) 3 ∶Eu 2+ phosphors exhibit a greenish-white-…
New nanocomposite materials based on a modified polypropylene (PP) and an amorphous polyamide (aPA)/organoclay nanocomposite were obtained in the melt state. Two aPA contents and organoclay contents in the dispersed phase that varied from 0 to 10 wt% were studied. All the fully exfoliated organoclay remained in the di…
A new upper bound for A-1 of a real strictly diagonally dominant M -matrix A is present, and a new lower bound of the smallest eigenvalue λminA of A is given, which improved the results in the literature. Furthermore, an upper bound for A-1 of a real strictly α -diagonally dominant M -matrix is shown.
The phase diagrams of trivalent lanthanide–alkali metal halide systems range from simple eutectic systems to systems with one or several congruently or incongruently melting compounds. Using both literature information and the authors’ extensive experimental results, the LnX3–MX binary mixture phase diagrams were scre…
In this study, the static pull-in instability of beam-type micro-electromechanical system (MEMS) is theoretically investigated. Considering the mid-plane stretching as the source of the nonlinearity in the beam behavior, a nonlinear size dependent Euler-Bernoulli beam model is used based on a modified couple stress th…
In their ideal structure, double perovskites such as Sr${}_{2}$FeMoO${}_{6}$ have alternating Fe and Mo along each cubic axis, and a homogeneous ferromagnetic metallic ground state. Imperfect annealing leads to the formation of structural domains. The moments on mislocated Fe atoms that adjoin each other across the do…
The interband optical properties of single‐crystal berlinite AlPO 4 have been investigated in the vacuum ultraviolet ( VUV ) range using VUV spectroscopy and spectroscopic ellipsometry. The complex optical properties were directly determined from 0.8 to 45 eV. Band gap energies, index of refraction and complex dielect…
OBJECTIVE: The aim of this study was to improve the oral bioavailability of spironolactone (SP). METHOD: SP was adsorbed on the fumed silica using supercritical CO2 (scCO2) technology and further compressed into tablets. The morphology was observed by scanning electron microscopy (SEM), and the crystalline form was in…