Materials Literature
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In this article, we report our results on 980nm high-index-contrast subwavelength grating (HCG) VCSELs for optical interconnection applications. In our structure, a thin undoped HCG layer replaces a thick p-type Bragg mirror. The HCG mirror can feasibly achieve polarization-selective reflectivities close to 100%. The…
Lattice dynamics of tetragonal hen egg-white lysozyme crystals was studied by Brillouin light scattering and differential ac-nanocalorimetry with controlled relative humidity from 298 to 330 K. Temperature dependences of fast quasitransverse phonon velocity and integral intensity were found to exhibit anomalies in the…
Abstract Imaging nano‐domains in spin crossover (SCO) compounds remains so far an unreached goal. We report on the first AFM tapping‐mode investigation of SCO single crystals, performed at room temperature with the well known mononuclear compound [Fe(ptz) 6 ](BF 4 ) 2 (ptz = 1‐propyl‐tetrazole) and the trinuclear supr…
Abstract The effects of compatibilizer and the number of layers on the interfacial adhesion and delamination model of coextruded microlayer samples consisting of alternating layers of high‐density polyethylene (HDPE) and polyamide 6 (PA6) were studied with T‐peel test. When more maleic anhydride‐grafted HDPE was incor…
The cross-plane thermal conductivity of several nanoscale layered oxides SiO2/Y2O3, SiO2/Cr2O3, and SiO2/Al2O3, synthesized by e-beam evaporation was measured in the range from 30 K to 300 K by the 3ω method. Thermal conductivity attains values around 0.5 W/m K at room temperature in multilayer samples, formed by 20 b…
Abstract The influence of relatively nontoxic thermal stabilizers including different types of organic calcium complex (Ca/Zn system of liquid stabilizers) and organotin on photodegradation of poly(vinyl chloride) (PVC) was investigated by color difference measurement, viscosity‐average molecular weight determination,…
Abstract This article reports an investigation into the miscibility and morphology of octaisobutyl‐substituted polyhedral oligomeric silsesquioxane (ibPOSS) nanocages over a wide concentration range (25–75 wt%) in polymer matrices, produced by solution blending. Three different, strategically chosen polymers were used…
Oxygen level in mammalian cell culture is often controlled by placing culture vessels in humidified incubators with a defined gas phase partial pressure of oxygen (pO(2gas)). Because the cells are consuming oxygen supplied by diffusion, a difference between pO(2gas) and that experienced by the cells (pO(2cell)) arises…
Abstract In an attempt to understand the relationships between the evolution of ultrasonic signal and the change of molecular structure during processing, shear‐induced chain orientation and its subsequent disorientation of high‐density polyethylene (HDPE) melts with different melt indices were studied using a noninva…
Recombination dynamics of photoluminescence (PL) in Au nanoclusters (NCs) with different capping molecules were studied with time-resolved PL. Based on the emission-energy of carrier lifetimes; we suggest that the fast and slow PL decay of Au NCs originates from recombination of the linear Au–S bond and the staple mot…
The immobilization of a thiophene-based tripodal ligand, with a donor sulfur, on the surface of an epoxide group containing a silica gel phase for the synthesis of a newly functionalized material based on porous silica-bound bi-thiophene tripodal ligand (SGBT) is described. The modified silica surface was characterize…
Single electrospun nanofibers of light-emitting conjugated polymers hierarchically assemble at nano- to macroscopic lengthscales in various helical morphologies. At nanoscopic lengthscales, molecular chains follow the microscopic assembly, prevalently aligning along the fiber dynamic axis, as demonstrated by polarized…
High-level ab initio calculations reveal that the Eu(2) dimer is a van der Waals molecule with extremely weak antiferromagnetic spin coupling. The Heisenberg spin-exchange model, validated by the multireference configuration interaction method, is used to construct the full set of model interaction potentials for the…
We report a solution-processed chemical reaction approach to patterned growth of rubrene polycrystalline films over Ag electrodes for organic field effect transistors. The reduction in cationic precursors of Ru•+ by Ag atoms generated neutral molecules with a concentration above the nucleation threshold near to the el…
Abstract Blends of linear‐low‐density polyethylene (LLDPE), low‐density polyethylene (LDPE), and high‐ density polyethylene (HDPE) were foamed and characterized in this research. The goal was to generate clear dual peaks from the expanded polyethylene (EPE) foam beads made from these blends in autoclave processing. Th…
We investigate the characterization and adsorption modeling of Ti 3 SiC 2 -derived carbons (Ti 3 SiC 2 -DCs) prepared by chlorination at three temperatures (600, 800, and 1000 °C) as well as samples heat-treated at 1100 °C for one and three day periods. The modeling exploits our recent finite wall thickness model-base…
The thickness-dependent morphology and structure transitions of pristine and thermally annealed F 16 CuPc thin films deposited from the vapor phase by organic molecular beam deposition have been studied with use of atomic force microscopy, scanning electron microscopy, and X-ray diffraction. Pristine films show clear…
Electrical characteristics of graphite oxide (GO) thin films deposited on a p-type silicon substrate were investigated to explore its potential application as a dielectric material in organic field effect transistors. Channel current in the GO films exhibited linear response with the applied bias in the positive volta…
A bisthienylethene-functionalized perylene diimide (BTE-PDI) photochromic dyad was synthesized for self-assembly into 1-D nanotubes by a reprecipitation method. SEM and TEM observations showed that the nanotubes were formed from their 0-D precursors of hollow nanospheres. HR-TEM images revealed that both the nanospher…
Formation of thin layers of the composite material by a method based on interphase polymerization induced by a transport-controlled redox reaction is described. The obtained films were of 0.2-1 microm thickness, consisted of polypyrrole and gold nanoparticles (up to 13.5 at. %), strongly adhered to the substrate surfa…