Materials Literature
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We analyze the molecular dynamics heterogeneity of the liquid crystal 4-n-octyl-4'-cyanobiphenyl nanoconfined in porous silicon. We show that the temperature dependence of the dynamic correlation length xi_(wall) , which measures the distance over which a memory of the interfacial slowing down of the molecular dynamic…
Phase field micromagnetic microelastic modeling is used to simulate magnetization processes in growth twinned Terfenol-D crystals under external magnetic field applied along the [112¯] growth direction. The simulations reveal complex domain microstructure evolution involving both magnetization rotation and domain wall…
Large magnetic circular dichroism (MCD) in Co-doped ZnO films is reported. The Co-(∼20%) doped ZnO films with oxygen deficiencies show ferromagnetic behavior at room temperature. While paramagnetic films exhibit a small MCD signal, broad MCD spectra with large amplitude of ∼20kdeg∕cm are observed for the ferromagnetic…
‘Charge-shifting’ cationic polymers are used to fabricate ultrathin multilayered films that promote the release of two different DNA constructs with separate and essentially nonoverlapping release profiles. This approach could contribute to the development of thin films and functional coatings capable of regulating th…
We report measurements of the phonon density of states in iron oxypnictide superconductors by inelastic x-ray scattering. Good agreement with ab initio calculations that do not take into account strong electronic correlations is found, and an unpredicted softening of phonon branches under F doping of these compounds i…
We report on the extremely large nonresonant quadratic optical nonlinearity of the stilbazolium salt trans-4′-(dimethylamino)-N-phenyl-4-stilbazolium hexafluorophosphate (DAPSH). The phenyl-pyridinium chromophores in DAPSH crystals grown from acetone solution pack with a highly aligned polar order, resulting in a very…
Abstract In this paper, we introduce a simple single‐step method for creating spatially graded helical nanostructured thin films. The films mimic some of the interesting polarization and coloration properties found in nature and enhance the application prospects for helically structured thin films. Our helical nanostr…
The development of a surfactant-driven route to control multifold assemblies of monodispersed gold nanoparticles dimensions controlled into one, two-, and three dimensional architectures is reported. By using a self-assembly route with careful choice of ligands, a tunable multi-dimensional assembly of quantum-sized go…
A simple mathematical algorithm is proposed to generate electron-density functions whose Fourier amplitudes match the diffraction intensities. The function is by construction everywhere positive. Using appropriate averaging procedures, the high-density regions of such functions could yield important structural informa…
Cointercalation of graphite with lithium and organic molecules, such as benzene and tetrahydrofuran (THF), is studied using first-principles calculations. The molecules play an important role in expanding the interlayer graphene distance to $\ensuremath{\sim}7.7\text{ }\text{\AA{}}$. The increased space permits multip…
Multilayer ZnO/Al/ZnO coatings were deposited by thermal evaporation on unheated substrates. Subsequently, the coatings were annealed in air in the temperature range 300–600 °C. The structural properties of the films were investigated using x-ray diffraction and atomic force microscopy. The chemical properties were de…
Abstract The luminescence properties of K 3 Tb(PO 4 ) 2 activated by Eu 3+ were studied at excitation over the 120–300 nm wavelength range. It is demonstrated that Tb 3+ ions, exhibiting a strong absorption band in the vacuum‐ultraviolet (VUV), can provide efficient sensitisation of Eu 3+ emission in this wave length…
We demonstrate that the resonant near fields of a large-area replica molded photonic crystal (PC) slab can efficiently couple light from a laser to SiO2–Ag “post-cap” nanostructures deposited on the PC surface by a glancing angle evaporation technique for achieving high surface enhanced Raman spectroscopy (SERS) enhan…
This paper reports the effect of replacement of selenium by germanium on the optical constants of chalcogenide Ge x As 20 Se 80− x (where x = 0, 5, 10, 15 and 20 at.%) thin films. Films of Ge x As 20 Se 80− x glasses were prepared by thermal evaporation of the bulk samples. The transmission spectra, T (λ), of the film…
<div class="htmlview paragraph">Viscosity index improvers based on poly(alkyl methacrylates) as well as polyolefins have been well known to the industry as key additives to formulate lube oils for decades. Recent efforts to combine these two chemistries to prepare well-defined comb polymer architectures have led…
An in situ telecentric height monitoring system was employed as a standard characterization tool for in situ height monitoring of nanotube forests. We demonstrated that the system possesses a wide dynamic range beyond the centimeter scale, high resolution of 1 μm, free from routine maintenance, simple installation, an…
A tangled web: Hydroentangling, a simple, high-speed, low-cost, environmentally benign textile technology, is used to assemble individual carbon nanotubes (CNTs) into strong, electrical-conducting, multifunctional CNT nonwoven membranes. Hydroentangled CNT membranes with thicknesses ranging from 80 nm to 1.5 mm can be…
The influence of Sn doping on the crystallization and thermal stability of Ge2Sb2Te5 phase change material was studied. Thermal analysis shows that the phase change of Sn7.0Ge20.6Sb20.7Te51.7 occurs slightly higher than that of Ge2Sb2Te5 at 154 °C and has a lower melting point at 536 °C. The activation energy for crys…
Interpenetrated inorganic–organic composite materials can be synthesized by twin polymerization of (µ4-oxido)-hexakis(µ-furfuryloxo)-octakis(furfuryloxo)-tetra-titanium. Poly(furfuryl alcohol)/titanium dioxide composites are formed in which the titania species are uniform dispersed. Pure nanosized titanium dioxide (an…
Surface polarity and shape-controlled ZnO nanostructures are synthesized on GaN thin films using metalorganic vapor phase epitaxy (MOVPE). By adjusting the growth parameters from Zn-rich at low temperature to O-rich at high temperature, morphology of ZnO nanostructures was tuned from nonpolar, smooth-surfaced ZnO nano…