Materials Literature
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We have performed detailed magnetic susceptibility measurements as well as synchrotron x-ray diffraction studies to determine the temperature vs concentration ($T$ - $x$) phase diagram of Cu${}_{1-x}$Mg${}_x$GeO${}_3$. We observe clear double peaks in the magnetic susceptibility implying two antiferromagnetic (AF) tra…
Measurements of the interfacial properties between an elastic tape and poly(methyl methylcrylate) substrates were carried out using a circular blister test. All properties, including adhesive fracture energy Ga, residual stress ςo and the elastic modulus of the tapes can be deduced in a single test. Three different ap…
Cavitation induced by a converging flow leads to such a powerful concentration of energy that subnanosecond flashes of light with an ultraviolet spectrum are emitted. Light intensity is enhanced a factor of 5000 by using xenon rather than helium. This xenon enhancement is similar to that seen with surface bubbles and…
The properties of nanostructured plastics are determined by complex relationships between the type and size of the nanoreinforcement, the interface and chemical interaction between the nanoreinforcement and the polymeric chain, along with macroscopic processing and microstructural effects. In this article, we investig…
Poly(ethylene terephthalate) (PET) and polystyrene (PS) are immiscible and incompatible and have been well recognized. In this study, styrene maleic anhydride random copolymer (SMA–8 wt % MA) and tetra-glycidyl ether of diphenyl diamino methane (TGDDM) are employed as reactive dual compatibilizers in the blends of PET…
The effects of ionic strength and pH on the diffusion coefficients and gross conformation of chitosan molecules in solution were studied. Chitosan with 83% degree of deacetylation (DD) was prepared from red shrimp (Solemocera prominenitis) processing waste. Ten different molecular weight chitosans were prepared by ult…
We have observed electric-field-induced and photoinduced switching from insulating to conducting state in stressed epitaxial Sm0.5Sr0.5MnO3 thin films fabricated by pulsed-laser deposition. Previously known only in bulk crystals of perovskite manganese oxides, the switching behavior in thin film form is more significa…
The interface formation between indium–tin–oxide (ITO) having various work functions and N,N′-bis-(1-naphthyl)-N,N′-diphenyl-1,1′-biphenyl-4,4′-diamine (NPB) was investigated using x-ray and ultraviolet photoelectron spectroscopy. Phosphoric acid and tetrabutylammonium hydroxide were used to modify the ITO work functi…
Polarization analyses of transmitted and first-diffracted orders have been performed on photoinduced gratings in azopolymers. The polarization states of diffracted orders depend strongly on irradiation time because of the contribution from both a phase grating at short time and a surface relief grating at longer time.…
First-principle studies of magnons and magnon-phonon interactions are carried out in bcc and fcc iron in the adiabatic approximation. It is shown that the phonons have a minor effect on magnons in bcc Fe and thus the lattice vibrations make a small contribution to the Curie temperature. fcc Fe is unstable against magn…
The ferromagnetic shape memory alloy Ni2MnGa has been grown on GaAs by molecular beam epitaxy. In situ reflection high energy electron diffraction, ex situ x-ray diffraction, and transmission electron microscopy selective area electron diffraction indicate the single crystal growth of a pseudomorphic tetragonal phase…
The properties of nanostructured plastics are determined by complex relationships between the type and size of the nanoreinforcement, the interface and chemical interaction between the nanoreinforcement and the polymeric chain, along with macroscopic processing and microstructural effects. In this article, we investig…
We have successfully grown Bi2Te3 thin films on CdTe(111)B using molecular-beam epitaxy. Structural and transport properties have been investigated using in situ reflection high-energy electron diffraction, θ–2θ x-ray diffraction analysis, thermopower, and Hall measurements. Both the crystallinity and the transport ar…
The effect of localized holes on the long-range antiferromagnetic order in bilayer cuprates is studied, by applying the renormalization group to the appropriate non-linear sigma model. The theory accounts quantitatively for the magnetic phase diagram of Ca doepd YBa_2Cu_3O_6.
Bi2Sr2-xLaxCaCu2O8+d superconducting whiskers were successfully grown from Bi-rich meltscontaining various La contents. Effect of La-doping on the whisker growth, structure and superconductivity has been studied. It has been found that the whiskers can be grown only from La-doped melts, no whisker was obtained from th…
Oriented, single phase thin films of La1−xCaxMnO3 have been deposited onto (100)-oriented LaAlO3 (0.1<x<0.5) substrates using the pulsed laser deposition technique. While for some compositions, the physical properties (transport and magnetization) of the as-grown films are higher than the bulk values, fo…
Superconductivity in thin films and powders, and in single crystals of Pr-123 has been found by Blackstead et al. and Zou et al., respectively. Nevertheless, up to now it has never been reported in sintered-policrystalline samples. We have prepared high-quality samples of this material by following a sol-gel method. W…
Omega-Methacryloyloxyalkyl phosphorylcholine (MAPC) polymer, which has various methylene chain lengths between the phosphorylcholine group and the backbone, was synthesized with attention to formation of the biomembrane. The effect of water-soluble poly(MAPC) on the function and activation of blood cells was evaluated…
The adhesion of marrow stromal osteoblasts and the adsorption of fetal bovine serum (FBS) proteins to end-capped poly(D,L-lactic acid) 50:50 (PLA50) of molecular weight 17,000 (PLA5017), non-end-capped PLA50 of molecular weight 11,000 (PLA5011h), and a diblock copolymer made of poly(ethylene glycol)-monomethyl ether o…
Crosslinking of dermal sheep collagen (DSC) was accomplished using 1, 4-butanediol diglycidyl ether (BDDGE). At pH values > 8.0, epoxide groups of BDDGE will react with amine groups of collagen. The effects of BDDGE concentration, pH, time, and temperature were studied. Utilization of a 4-wt % BDDGE instead of 1-wt %…