Materials Literature
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We found that the drying process of the droplet of water-poly(N,N-dimethylacrylamide) (PDMA) solution on a glass substrate shows a somewhat unusual behavior. In this system, the contact line starts to recede at an early stage of drying, and as it recedes, it leaves a macroscopic polymer film behind. The resulting film…
We have investigated the transmission and reflection properties of structures incorporating left-handed materials with graded index of refraction. We present an exact analytical solution to Helmholtz' equation for a graded index profile changing according to a hyperbolic tangent function along the propagation directio…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTNovel Functionalized Conjugated Polythiophene with Oxetane Substituents: Synthesis, Optical, Electrochemical, and Field-Effect PropertiesKun Lu†‡, Yunlong Guo†‡, Yunqi Liu*†, Chong-an Di†, Tao Li†‡, Zhongming Wei†‡, Gui Yu†, Chunyan…
Abstract Mechanical and dynamic‐mechanical properties of a typical tire tread compound reinforced with one part aramid short fibers were investigated in order to predict the effects of fibers on tire tread performances such as rolling resistance and traction. Rubber processing, including mixing and extrusion, was perf…
An innovative and effective approach based on low-pressure, low-frequency, thermally nonequilibrium, high-density inductively coupled plasmas is proposed to synthesize device-quality nanocrystalline silicon (nc-Si) thin films at room temperature and with very competitive growth rates. The crystallinity and microstruct…
Mixing two types of glass formers in ion conducting glasses can be exploited to lower conductivity activation energy and thereby increasing the ionic conductivity, a phenomenon known as the mixed glass former effect (MGFE). We develop a model for this MGFE, where activation barriers for individual ion jumps get lowere…
Cocontinuous phase structures of immiscible polymers can be developed under appropriate melt-blending conditions. Because of the presence of interfacial tension, such cocontinuous structures start to coarsen when heated to a temperature higher than the melting/softening temperature of both phases. In this study, a met…
Adsorption of dopamine (DA) on a Au core −Ag shell bimetallic nanocolloidal surface has been investigated using surface-enhanced Raman spectroscopy (SERS). The normal Raman spectra (NRS) of DA molecules in bulk and in aqueous solution have been investigated in depth. The vibrational signatures, as observed from the Ra…
Near edge X-ray absorption fine structure (NEXAFS) spectroscopy is used to precisely probe the alignment, uniformity in crystal growth direction, and electronic structure of single-crystalline V 2 O 5 nanowire arrays prepared by a cobalt-catalyzed vapor transport process. The dipole selection rules operational for cor…
An extensive study of the factors that affect the interfacial assembly of bionanoparticles at the oil/water (O/W) interface is reported. Bionanoparticles, such as viruses, have distinctive structural properties due to the unique arrangement of their protein structures. The assembly process of such bionanoparticles at…
Abstract We report surface‐enhanced Raman scattering (SERS) spectra from 4‐mercaptopyridine (4‐Mpy) adsorbed on sub‐monolayers of α‐Fe2O3 nanocrystals (sphere, spindle, cube). The maximum enhancement factor has been estimated to be about 104 compared to that of 4‐Mpy in solution. A possible mechanism has been proposed…
A new model for analyzing in situ small-angle X-ray scattering measurements of the formation of hexagonal ordered mesoporous silica has been developed. It employs a factorization of the scattering intensity into contributions from the form factor and the structure factor. The model can therefore be used for the entire…
We present a method to produce superparamagnetic iron oxide/silica nanocomposites that have a large BET surface area, a high pore volume, and at least one pore size population centered at around or larger than 10 nm. By means of this methodology, which is based on nanocasting techniques, we are able to not only prepar…
Electronic states of normal graphene, the defective graphene (one carbon atom is removed from the normal graphene), the defective graphene anion (defective graphene plus an excess electron), and the defective graphene cation (defective graphene plus one hole) have been investigated by means of density functional theor…
In this paper, we report on diamond synthesis in the sulfur−carbon (S−C) system at temperatures in the range of 1550−2000 °C and pressures of 6.3−7.5 GPa. It is established that crystallization of carbon phases (diamond and graphite), the degree of the graphite-to-diamond conversion, and diamond crystal morphology are…
The novel memory effect of a nonpolar paraelectric phase with a collinear spin structure has been observed in a magnetoelectric multiferroic material MnWO4. Since the ferroelectric polarization arises from a noncollinear spin structure, in a new class of magnetoelectric multiferroic materials with a spiral-spin struct…
Abstract The preparation of mesoporous nanocompartment films composed of both hollow silica capsules and silica particles by using layer‐by‐layer (LbL) adsorption is described. The resultant nanocompartment films exhibit stepwise release of encapsulated water molecules without application of external stimuli. The holl…
We study the conductance of disordered graphene superlattices with short-range structural correlations. The system consists of electron- and hole-doped graphenes of various thicknesses, which fluctuate randomly around their mean value. The effect of the randomness on the probability of transmission through the system…
The accuracy of DFT methods for treating NO bonding to heme groups, both with ferric and ferrous iron, is assessed. These systems are shown to be unusually challenging for obtaining accurate binding energies. The hybrid functionals B3LYP and B3PW91 underestimate the bond energy, and the nonhybrid functional BP86 overe…
Molecular dynamics simulations and complementary neutron and x-ray diffraction studies have been carried out within the single phase glass forming range of (Y(2)O(3))(x)(Al(2)O(3))((100-x)), for x = 27 and 30. For x = 27, the experimental Al-O and Y-O coordination numbers are found to be 4.9 ± 0.2 and 6.9 ± 0.4 respec…