Materials Literature
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The dark conductivity (dc and ac) and dielectric properties of chromotrope 2R (CHR) in pellet as well as in thin film forms have been investigated as function of frequency (100 Hz to 5 MHz) within the temperature range (293–423 K). The ac conductivity of CHR pellet in sandwich structure employing two symmetrical gold…
Magnetic proximity effects in single-crystalline NixMn100-x/Ni(/Co) bilayers on Cu3Au(001) are investigated for in-plane (IP) and out-of-plane (OoP) magnetization by means of the longitudinal and polar magneto-optical Kerr effect. Attention is paid to the influence on concentration- and thickness-dependent antiferroma…
A series of polypropylene/poly(ethylene- co -propylene) in-reactor alloys was prepared by a periodic switching polymerization process (PSPP) in which the monomer feed was periodically switched between pure propylene and an ethylene/propylene mixture using a commercial TiCl 4 /MgCl 2 /phthalate–Al(C 2 H 5 ) 3 /DCPDMS Z…
Analytic solutions for finding the achromatic triplet in the midwave and longwave infrared spectra simultaneously are explored. The relationship between the combination of promising refractive materials and the system’s optical power is also formulated. The principles for stabilizing the effective focal length of an a…
The structural and magnetic properties of seven PrMn2Ge2-xSix compounds with Si concentrations in the range x = 0.0-2.0 have been investigated by x-ray diffraction, magnetic (5-350 K), differential scanning calorimetry (300-500 K) and neutron diffraction (3-480 K) measurements. Replacement of Ge by Si leads to a contr…
ABSTRACT Polyvinyl alcohol(PVA) bead crosslinked with boric acid has been widely utilized as a microorganism immobilization carrier. However, it has some disadvantages such as drastic cell viability loss, small adsorption capacity and mass transfer limitation. To improve upon these drawbacks, a new method to prepare P…
Approximately 60% of oil and 40% of gas world reserves are in carbonate reservoirs. These reservoirs are heterogeneous with a textural variety and typically fractured, leading to low recovery factors and also complex relationships between rock properties and geophysical data. Studies of these reservoirs have become ve…
A methodology is presented to obtain a kinetic model for curing reactions, from conversion against time and the glass‐transition temperature versus conversion data. Isothermal runs for a cyanate ester resin from 140 to 190°C, reported previously, were evaluated. The approach utilizes the conversion measurement time de…
NMR spin-spin couplings through a hydrogen bond in the free-base and protonated forms of the complete series of [(15)N2]-N-methylated 1,8-diaminonaphthalenes have been analyzed using quantum chemistry tools. The dominating role of the overlap of the coupling pathway orbitals has been demonstrated. The correlation of t…
Mechanical properties of glass fiber reinforced composite materials are affected by fiber sizing. A complex film formation, based on a silane film and PVA/PVAc (polyvinyl alcohol/polyvinyl acetate) microspheres on a glass fiber surface is determined at 1) the nanoscale by using atomic force microscopy (AFM), and 2) th…
“Adsorption, absorption, and crystal growth”: the controlled growth of crystalline organic thin films on top of another organic solid perfectly fits with the title of the school, being a specific example of crystal growth on a solid surface, where adsorption is the fundamental process. In this contribution, after illu…
Comparing with the well-established theory of periodic surface faceting, the formation mechanism of localized surface faceting is not yet clear. We investigate the localized surface faceting of 4H silicon carbide (4H-SiC) epilayers using atomic force microscopy (AFM). The AFM measurements reveal that this phenomenon g…
A biomaterial is defined as a material, either man-made or natural, intended to interact with biological systems. It does not have a chemical effect in the organism, nor thus it need to be metabolised to be active like for example drugs 1. When inserted into the body, a local tissue inflammatory reaction called fore…
In this article, biodegradability of Low Density Polyethylene (LDPE) with potato starch was studied. Polyethylene grafted maleic anhydride (PE-g-MA) used as a compatibilizer. Samples with different levels of potato starch (as10%, 20%, 30% and 40%) with constant amount of PE-g-MA as 5% were prepared. In all samples amo…
Electrical evaluation along with the material analysis and reliability investigation of cosputtered Cu/Ti bonded interconnect in 3-D integration is presented in this paper. Diffusion behavior of cosputtered metals under different bonding ambient is evaluated as well. This paper shows that the bonded structure exhibits…
The authors report the fabrication and optical characterization of fully suspended, transferrable, and deflectable silicon photonic crystal nanomembranes. Starting with a silicon-on-insulator wafer, the authors used electron beam lithography and inductively coupled plasma reactive ion etching (ICP-RIE) to introduce va…
Stoichiometric LnBaFe4O7.0 oxides with Ln = Dy to Lu have been synthesized and protected in order to prevent oxidation at room temperature. The structural study of these compounds, using laboratory and synchrotron X-ray as well as neutron powder diffraction, shows the extraordinary flexibility of the tetrahedral [Fe4]…
Abstract Dry reforming of methane (CH4) with carbon dioxide (CO2) catalysts produces synthesis gas at atmospheric pressure. Synthesis gas is important feed stock to chemical and petrochemical industries to produce chemicals such as methanol and ammonia. It is also a source of hydrogen that is potential to fuel cells.…
In Arabidopsis leaves there is a bi-phasic dose-response to applied nucleotides; i.e., lower concentrations induce stomatal opening, while higher concentrations induce closure. Two mammalian purinoceptor antagonists, PPADS and RB2, block both nucleotide-induced stomatal opening and closing. These antagonists also part…
Microscopic structures of monodispersed rhodium dicarbonyl species chemisorbed on a ceramic metal-oxide support (γ-alumina) have been obtained by density functional theory (DFT) calculations with periodic boundary conditions applied. Several minimum energy structures of species were obtained and their relative energie…