Materials Literature
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Experiments on fracture surface morphologies offer increasing amounts of data that can be analyzed using methods of statistical physics. One finds scaling exponents associated with correlation and structure functions, indicating a rich phenomenology of anomalous scaling. We argue that traditional models of fracture fa…
We study interacting electrons in a periodic potential and a uniform magnetic field ${\bf B}$ taking the spin-orbit interaction into account. We first establish a perturbation expansion for those electrons with respect to the Bloch states in zero field. It is shown that the expansion can be performed with the zero-fie…
The occurrence of spin polarization at ZrO 2 , Al 2 O 3 and MgO surfaces is proved by means of ab initio calculations within the density functional theory. Large spin moments, as high as 1.56 μ B , develop at O-ended polar terminations, transforming the non-magnetic insulator into a half-metal. The magnetic moments ma…
BiFeO 3 (BFO) thin films of pure perovskite phase were deposited on LaNiO3-buffered Pt∕TiOx∕SiO2∕Si (LNO) and Pt∕TiOx∕SiO2∕Si (Pt) substrates by RF magnetron sputtering. Highly (100)-oriented BFO film was coherently grown on LNO at a temperature as low as 300 °C. The crystal structure and the film/electrode interface…
Raman scattering measurements were conducted for a 4-aminobenzenethiol (4-ABT) monolayer assembled on a macroscopically smooth Au substrate. Although no peak was detected at the beginning, Raman peaks were distinctly observed by attaching Ag or Au nanoparticles onto the 4-ABT monolayer (Ag(Au)@4-ABT/Au(flat)). Conside…
Organic-inorganic hybrid films were prepared through layer-by-layer (LBL) deposition of poly(allylamine hydrochloride) (PAH) and ZrO(2) nanoparticles coated with poly(acrylic acid) (PAA), allowing facile control of surface roughness and hydrophobicity. Superhydrophobic behavior was observed after deposition of silica…
We present powder and single-crystal neutron diffraction and bulk measurements of the Kagome-staircase compound Ni3V2O8 (NVO) in fields up to 8.5T applied along the c-direction. (The Kagome plane is the a-c plane.) This system contains two types of Ni ions, which we call "spine" and "cross-tie". Our neutron measuremen…
We study the linear- and nonlinear-optical lineshapes of metal nanoparticles (theory) and metallic photonic crystal slabs (experiment and theory). For metal nanoparticle ensembles, we show analytically and numerically that femtosecond second- or third-harmonic-generation (THG) experiments together with linear extincti…
Rhodium (Rh) is found similar to Palladium (Pd) in making near-Ohmic electrical contacts to single-walled carbon nanotubes (SWNTs) with diameters d>∼1.6nm. Non-negligible positive Schottky barriers (SBs) exist between Rh or Pd and semiconducting SWNTs (S-SWNTs) with d<∼1.6nm. With Rh and Pd contacts, the…
The functional versatility of tetrapyrroles as natural cofactors is related to their conformational flexibility where manipulation of the macrocycle conformation allows a fine-tuning of their physicochemical properties. This feature article gives a personal account of the synthesis and solid state structural character…
The evaporation process for small, 1-2-mm-diameter droplets of water from patterned polymer surfaces is followed and characterized. The surfaces consist of circular pillars (5-15 microm diameter) of SU-8 photoresist arranged in square lattice patterns such that the center-to-center separation between pillars is 20-30…
A series of new alkoxy-amino-bis(phenols) (H2L 1-6) has been synthesized by Mannich condensations of substituted phenols, formaldehyde, and amino ethers or diamines. The coordination properties of these dianionic ligands towards yttrium, lanthanum, and neodymium have been studied. The resulting Group 3 metal complexes…
A versatile method to produce superhydrophobic fabrics by combining electrospinning and initiated chemical vapor deposition (iCVD) is reported. In this study, poly(caprolactone) (PCL) was first electrospun and then coated with a thin layer of hydrophobic polymerized perfluoroalkyl ethyl methacrylate (PPFEMA) by iCVD.…
RATIONALE AND OBJECTIVES: To characterize and compare commercially available contrast media (CM) for magnetic resonance imaging (MRI) in terms of their relaxivity at magnetic field strengths ranging from 0.47 T to 4.7 T at physiological temperatures in water and in plasma. Relaxivities also were quantified in whole bl…
Polymer science naturally began with the search for experimental evidence establishing the existence of long-chain molecules and for ways to theoretically understand the consequences of long-chain connectivity. Most of the early pioneering research focused on polymer solutions where small changes in factors such as si…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSurface-Induced Crystal Orientation of Poly(trimethylene 2,6-naphthalate) Films Studied by Polarized FTIR-ATR and Grazing Incidence X-ray DiffractionYongri Liang and Han Sup LeeView Author Information Department of Textile Engineering, INHA University, Incheon 402-751, Korea Ci…
To design new hydrogen storage materials a main prerequisite is the knowledge about the site preference of hydrogen in the corresponding nonhydride phases. From the systematic investigation of ZrNiAl-type phases we found that the electron-localization function (ELF) can correctly predict the site preference of hydroge…
We investigate the crazing process (craze initiation, growth, and failure) in symmetric polystyrene- b -poly(2-vinylpyridine) (PS- b -P2VP) glassy thin films. PS- b -P2VP is a model material for this study due to its ability to self-assemble into well-aligned lamellar microdomains and the similar mechanical properties…
We have presented liquid crystal phase gratings using photoregulated photocrosslinkable polymer liquid crystals. The phase grating consists of homogeneous and 90°-twisted nematic area and shows unique polarization conversion in the diffraction process. The diffraction properties are well explained by the theory based…
The structures and magnetic properties of melt-spun B-rich (10 at. %) and Nb-containing nanocomposite alloys, with compositions based on the formula (Nd0.75Pr0.25)yFe90−y−xNbxB10 (y=8, 10; x=0, 2, 4) have been studied. Considerable enhancement of the intrinsic coercivity, (of 657kA∕m) together with excellent energy de…