Materials Literature
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The binding of fluorescent probe molecules to poly(amidoamine) starburst dendrimers of generations G-0, G-1, and G-2 was investigated. The solubilizing capability of these new materials, in aqueous media, increases with increasing degree of their generation. Pyrene fluorescence however undergoes significant quenching…
Functionalized self-assembled monolayers (SAMs) of alkanethiolates on gold were used to study citrated human plasma protein adsorption by ellipsometry and antibody techniques in vitro . The aspiration is to gain knowledge about how surface properties affect such events like coagulation and complement activation, which…
The electronic structure of pyramidal shaped InAs/GaAs quantum dots is calculated using an eight-band strain dependent $\bf k\cdot p$ Hamiltonian. The influence of strain on band energies and the conduction-band effective mass are examined. Single particle bound-state energies and exciton binding energies are computed…
The effect of pressure on acceptor levels and hole scattering mechanisms in p-GaSe is investigated through Hall effect and resistivity measurements under quasi-hydrostatic conditions up to 4 GPa. The pressure dependence of the hole concentration is interpreted through a carrier statistics equation with a single (nitro…
We present a general procedure for obtaining progressively more accurate functional expressions for the electron self-energy by iterative solution of Hedin's coupled equations. The iterative process starting from Hartree theory, which gives rise to the GW approximation, is continued further, and an explicit formula fo…
Volume is indexed by Thomson Reuters CPCI-S (WoS).The present book provides a timely update to the current understanding of degradation processes in high-temperature materials, as related to chemical interactions with the environment.The methods used to combat this degradation - particularly by means of protective coa…
In the binary glass system, a change of structural regime takes place near the composition . The presence of this topological threshold is established by direct and indirect evidence, such as peculiarities in the compositional dependence of the Raman vibrational modes, optical band-gap energy and drift mobilities of g…
By using large oil-in-water droplets covered with ionic surfactant we measure contact angles to deduce the adhesive energy between macroscopic interfaces as a function of the temperature $T$ and the salt concentration $C$. A wetting transition takes place at a well defined temperature ${T}^{*}(C)$. At the colloidal sc…
Single mode channel waveguides were fabricated in soda lime glass by poling the samples at 280 °C with 2.5 kV bias voltage. The refractive index of the glass was reduced by 1.5% due to the depletion of sodium ions, making possible the formation of waveguides in a depressed cladding configuration.
This letter reports a new way of preparing wafer sized SiGe quantum dots on an ordered mesoporous sol gel silica coated Si. It was found from x-ray diffraction that very good regular layers of mesoscopic sized SiGe quantum dots can be formed in the silica. Initial low temperature photoluminescence measurements show mu…
We report the formation of nanosize ferromagnetic MnAs crystallites imbedded in low-temperature grown GaAs using Mn+ ion implantation and subsequent annealing. The structural and magnetic properties of the crystallites have been characterized by transmission electron microscopy, electron beam induced x-ray fluorescenc…
Specular x-ray reflectivity (XRR) measurements were used to study the density and surface roughness of ultrathin hydrogen-free amorphous carbon films deposited by sputtering, of thickness varying from 25 to 325 Å. The film thickness and surface roughness obtained from XRR measurements are in good agreement with that f…
Measurements of the temperature dependence of the resistivity $\ensuremath{\rho}(T)$ and thermoelectric power $\ensuremath{\alpha}(T)$ under several hydrostatic pressures were made on single crystals of ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{MnO}}_{3}$ with $x\phantom{\rule{0ex}{0ex}}=\phantom{\rul…
The effect of particle size on the ferroelectric transition in fine-particle porcelain produced by the inorganic sol - gel method was investigated. The phase transition was measured by dielectric properties, variable temperature x-ray diffraction, and differential scanning calorimetry (DSC). The tetragonal distortion…
Monomer solubility is identified as the primary factor determining network morphology in polymer stabilized cholesteric liquid crystal textures. Poorly soluble monomers form coarse structures composed of discrete, oblong grains, whereas soluble monomers yield smooth, continuous polymer networks. A crossover from smoot…
Oxygen $K$-edge electron-energy-loss spectra have been measured for ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{MnO}}_{3}$ $(0\ensuremath{\le}x\ensuremath{\le}0.7)$ and ${\mathrm{La}}_{0.7}{\mathrm{Sr}}_{0.3}{\mathrm{MnO}}_{z}$ thin films as a function of $x$ and $z$. The spectra show a prepeak at the F…
We are optimizing thin films of perovskite manganese oxides for bolometric applications. We have studied the relevant material characteristics of several members of this family namely, La0.7Ba0.3MnO3, La0.7Sr0.3MnO3, La0.7Ca0.3MnO3, and Nd0.7Sr0.3MnO3. Here, we discuss issues related to the choice of material, the inf…
Rubber-grade carbon black filler HAF(N330) was modified with a plant product (PP; long aliphatic chain substituted phenols), a proprietary item under patent application, in the presence or absence of hexamine (Hexa) or dicumyl peroxide (DCP) to put a flexible moiety in between the carbon black and the elastomer chain…
Toughness of poly(butylene terephthalate) (PBT) was improved by reactive blending of PBT with 2-substituted 1,3-oxazoline intermediates such as low-molecular-weight bisoxazolines, and oxazoline-functionalized nitrile rubbers derived from both nitrile liquid rubber (Nipol®) and high-molecular-weight hydrogenated nitril…
The toughening enhancement of Polyamide 6 blended with different types of functionalized elastomers was studied. Morphological analysis by scanning electron microscopy (SEM) were performed on undeformed samples in order to determine particle—size distribution. Yet more SEM examination of the damage zone ahead of notch…