Materials Literature
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We use molecular dynamics with a first-principles-based shell model potential to study the electrocaloric effect (ECE) in lithium niobate, LiNbO(3), and find a giant electrocaloric effect along a line passing through the ferroelectric transition. With an applied electric field, a line of maximum ECE passes through the…
Polymeric nanoparticles are promising candidates as drug and gene carriers. Among polymeric nanoparticles, those that are responsive to internal or external stimuli are of greater interest because they allow more efficient delivery of therapeutics to pathological regions. Stimulus-sensitive polymeric nanoparticles hav…
Silicone has been used for peritoneal dialysis (PD) catheters for several decades. However, bacteria, platelets, proteins, and other biomolecules tend to adhere to its hydrophobic surface, which may lead to PD outflow failure, serious infection, or even death. In this work, a cross-linked poly(poly(ethylene glycol) di…
In the chemical enhancement mechanism for Raman scattering, the two types of charge-transfer models, the excited-state and the ground-state charge-transfer mechanisms, present the different dependence of the enhanced Raman signals on the excitation wavelength. To investigate the type of charge-transfer mechanism in gr…
Electrospinnng is one of the most conventional methods for producing nano fibers in different forms, such as core-shell hollow and porous nanofibers. These forms open new windows on innovative applications for nanofibers like ultra filtration, fuel cells, membranes, tissue engineering, catalysis and drug delivery or r…
Silicene, the all Si analogue of graphene is structurally different due to the presence of buckling distortions in the individual six membered rings. The sufficiently strong coupling between the unoccupied molecular orbitals (UMOs) with occupied molecular orbitals (OMOs) leads to pseudo-Jahn–Teller distortion (PJT) an…
We report a study of the valence band dispersion of twisted bilayer graphene using angle-resolved photoemission spectroscopy and ab initio calculations. We observe two noninteracting cones near the Dirac crossing energy and the emergence of van Hove singularities where the cones overlap for large twist angles (>5°). B…
Based on systematic first principles calculations, we investigate Sr surface segregation (SSS) in La(1-x)Sr(x)Co(1-y)Fe(y)O(3-δ) (LSCF) (a typical perovskite ABO(3) compound), a bottleneck causing efficiency degradation of solid oxide fuel cells. We identify two basic thermodynamic driving forces for SSS and suggest t…
Hydrogen adatoms are shown to generate magnetic moments inside single layer graphene. Spin transport measurements on graphene spin valves exhibit a dip in the nonlocal spin signal as a function of the applied magnetic field, which is due to scattering (relaxation) of pure spin currents by exchange coupling to the magn…
Silk protein-biomaterial wound dressings with epidermal growth factor (EGF) and silver sulfadiazine were studied with a cutaneous excisional mouse wound model. Three different material designs and two different drug incorporation techniques were studied to compare wound healing responses. Material formats included sil…
Abstract In this study the surface adjustment by two polymers with addition of preservatives of chosen packaging material on starch base with incorporated additives has been investigated. Its bioactive function was verified by measuring zones of inhibition and mutual comparison of bacteriocin released from samples coa…
Piezoelectric materials are commonly used in various sensors and actuators. Besides the traditional piezoelectric ceramics such as Lead Zirconate Titanate and polar piezoelectric polymers such as β-phase Polyvinylidene Fluoride, piezoelectrets have recently become a new group of piezoelectric materials. Piezoelectrets…
Electrochemical noise (EN) measurements and their corrosion products were observed by Scanning Electron Microscopy (SEM). Digital image process allows changing the image result of corrosion products in an equivalent signal. Samples of Ti-6Al-4V were produced by mechanical milling at different milling times. After that…
z La z O 19 with (x = 0.1, 0.25, 0.4; z = 0.1, 0.2, 0.3 & y = 0.2) were synthesized by high temperature solid state diffusion reactions. The dielectric constant (') dielectric loss tangent (tan) and complex dielectric constant ( * ) of the compounds were studied in the frequency range of 10Hz -2MHz. The dielectric par…
We present the fabrication and characterisation of Dy<sup>3+</sup>-doped tellurite glasses and waveguides for applications in the mid-IR. The low phonon energy and large rare-earth ion solubility of tellurite glasses, as well as having infrared transmission ranges up to <5 μm, make them promising candidates for new…
In this paper, the problem of a line source radiation on top of a grounded dielectric slab covered with a graphene sheet is analyzed through the method of plane waves expansion. It is demonstrated that besides providing the tunability of radiation parameters, existence of graphene on top of the substrate, eliminates t…
With the sixth large-scale railway speed-up, the quality of the axles is essential to the safety of the locomotive. According to the high-speed axle technical standard for the control of alloy elements in axle steel, optimization experiments of 25CrMo steel composition were performed by vacuum inductive melting. In or…
Targeted drug delivery has been one of the most important biomedical applications for magnetic particles. Such applications require magnetic particles to have functionalized surfaces/surface coatings that facilitate their incorporation into a polymer matrix to produce a polymer composite. In this paper, nanocrystallin…
The results of an X-ray Photoelectron Spectroscopy study conducted on a series of gold nanoparticles recently reported by us, stabilized by monodentate, bidentate, tridentate and tetradentate thiolate calix[n]arene ligands, are presented here. By virtue of the different denticity of the ligands, the nuclearity of the…
One of most effective NOx control technology of modern diesel engines is SCR with ammonia. Current NOx reduction systems are being designed to use a solution of urea dissolved in water as a source of ammonia. However, there is a lot of demand for alternative ammonia source, because the urea solution supply systems are…