Materials Literature
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We have investigated the effect of the initial condition on the spreading exponents of the one-dimensional pair contact process (PCP) and threshold transfer process (TTP).The non-order field was found to exhibit critical fluctuations, relaxing to its natural value with the same power-law as the order parameter field.…
A technology has been developed to make all polymer integrated circuits. It involves reproducible fabrication of field-effect transistors in which the semiconducting, conducting and insulating parts are all made of polymers. The fabrication on flexible substrates uses spin-coating of electrically active precursors and…
Polyethyleneglycol-based networks were employed as substrates to graft bioactive peptides to study macrophage interactions with materials. Our overall objective was to utilize biologically active factors to stimulate certain macrophage function on materials suitable for implantation in connective tissues. In this stud…
Blends of Nylon 6 with very low density polyethylene (VLDPE) have been studied. The blends exhibit two phase morphology wherein VLDPE is dispersed in the form of spherical domains in Nylon 6 matrix. The water absorption of the blends decreased with increasing VLDPE content. The mechanical properties of these blends sh…
A series of (2-hydroxyethylmethacrylate)(n-propoxy)cyclotriphosphazenes (HPCP) has been prepared by the reaction of N3P3Cl6 with n-propanol and 2-hydroxyethylmethacrylate (HEMA) sequentially in the appropriate solvents. These phosphazene compounds are characterized by a combination of Fourier transform infrared, ultra…
A maleic-anhydride-grafted styrene–ethylene—butylene–styrene (SEBS–MA) triblock copolymer has been used as a compatibilizer in low-density polyethylene–wood flour (LDPE–WF) composite system. The location of compatibilizer was studied using transmission electron microscopy (TEM). The unsaturated parts of the copolymer…
The flow of granular material through a rough narrow pipe is described by the Langevin equation formalism. The stochastic force is caused by irregular interaction between the wall and the granular particles. In correspondence with experimental observations we find clogging and density waves in the flowing material.
Recently it has been discovered that lanthanum, yttrium, and other metal hydride films show dramatic changes in the optical properties at the metal-insulator transition. Such changes on a high energy scale suggest the electronic structure is best described by a local model based on negatively charged hydrogen (H$^-$)…
Electronic absorption and fluorescence spectroscopies are applied to study the adsorption of rhodamine 3B dye on Laponite particles in aqueous suspensions. The adsorption on the clay favors the aggregation of the dye. The monomer and aggregates of rhodamine 3B can be adsorbed on both the external and the internal surf…
The dream of molecular electronics and optics has recently been approached by several groups working on nanochemistry. They succeeded in building a transistor from a CdSe nanoparticle synthesized by wet-chemical methods (see diagram on the right) which can operate with single electrons. In the field of optics the lumi…
Allgemeingültige Prinzipien für das Design von tetraedrischen M4L4-Clustern (L=Ligand) werden am Beispiel der Bildung und Struktur der rechts abgebildeten [Ti4L4]8−-Spezies näher erläutert.
The physical principles of the MRI model (abbreviation for mixing-roughness- information depth) for the theoretical calculation of measured concentration- depth profiles obtained in sputter depth profiling with AES, XPS, SIMS, etc. are outlined. The main features of the calculation and the respective visual Basic prog…
The results of an experiment on the thermal stability of LiF GR-200 are presented. The evolution of the glow curves after controlled storage at 40(C and 70(C was studied in order to draw conclusions valid for environmental exposures. The comparison of the changes experienced by dosemeters irradiated before and after s…
LiF:Mg,Cu,P phosphors, which have a very high thermoluminescent (TL) sensitivity, are attractive for low level radiation monitoring. While the roles of Mg- and P- related defects on the TL process in this material are reasonably well understood, the role of the Cu impurity is still unclear. In this research, extended…
We analyze statistical probability distributions of intensities collected by diffraction techniques like Low-Energy Electron Diffraction. A simple theoretical model based in hard-sphere potentials and LEED formalism is investigated for different values of relevant parameters: energy, angle of incidence, muffin-tin pot…
An analytic derivation of the spinodal of a polydisperse mixture is presented. It holds for fluids whose excess free energy can be accurately described by a function of a few moments of the size distribution. It is shown that one such mixture of hard spheres in the Percus-Yevick approximation never demixes, despite it…
We study the role of diamagnetic effects on the transport properties of metallic magnetic multilayers to elucidate whether they can explain the Giant Magnetoresistance (GMR) effect observed in those systems. Realistic Fermi surface topologies in layered ferromagnets are taken into account, with the possibilities of di…
Abstract The technique of photo-electron emission microscopy (PEEM) is based on imaging of photo excited electrons from a surface. Typically ultra violet (UV) light above the work function of a metal will cause electrons to be emitted from a surface. Since photo excited electrons originate very near to the surface, th…
Abstract Compositional mapping with energy dispersive x-ray spectrometry (EDS) in the scanning electron microscope (SEM) is one of the most widely used techniques for elemental imaging of microstructures. SEM/EDS maps are usually qualitative presentations of elemental distributions in x-y space. In older implementatio…
V2O5 is a layered semiconducting oxide, which is used as a catalyst for the partial oxidation of hydrocarbons. In view of its catalytic applications, the vibrational properties of the (001) surface were examined by means of HREELS, a technique which is uniquely sensitive to the first layers' characteristics. On a clea…