Materials Literature
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Sum-Frequency Vibrational Spectroscopy (SFVS) has been used to investigate the effect of nitrogen-flow drying on the molecular ordering of Layer-by-Layer (LbL) films of poly(allylamine hydrochloride) (PAH) alternated with poly(styrene sulfonate) (PSS). We find that films dried by spontaneous water evaporation are more…
Zirconia powders doped with different amounts of dopants (CeO2, Gd2O3, and CaO) were synthesized by a citrate technique. X-ray diffraction for samples sintered at 1500 °C revealed that the zirconia ceramics were stabilized in the cubic phase above 12 mole % CaO and 10 mole % Gd2O3, while tetragonal zirconia is obtaine…
Hollow microcapsules containing polymeric micelles in their walls were fabricated by alternating assembly of poly(allylamine hydrochloride) (PAH) and poly(styrene- b-acrylic acid) (PS- b-PAA) micelles on MnCO(3) microparticles followed by sacrificing the templates in acid solution. The successful formation of PAH/mice…
We present here a detailed study of the controlled release of amino acid derived amphiphilic molecules from the internal pore structure of mesoporous nanoparticle drug delivery systems with different structural properties; namely cubic and hexagonal structures of various degrees of complexity. The internal pore surfac…
Microcrystals of potassium hydrogen hexaniobate (K 1.8 H 2.2 Nb 6 O 17 · n H 2 O) and nanoscrolls derived from them were suspended in an aqueous solution of tetramethyl orthosilicate and then subjected to a static homogeneous 11.74 T magnetic field as the silicate solution formed a gel. After supercritical drying of t…
Abstract An investigation based on an ultra‐soft, pseudo‐potential, density functional theory (DFT) method, using a generalized gradient approximation (GGA) under periodic boundary conditions, is performed in order to investigate the effect of substitutional nitrogen on the CH 3 adsorption and the H abstraction from t…
The chelating characteristics of 1-(aminoformyl-N-phenylform)-4-ethylthiosemicarbazide (H3APET) towards Cr3+, Fe3+, Mn2+, Co2+, Ni2+, Cu2+, Cd2+, Zn2+ and ions have been investigated. The structures of the isolated complexes were assigned based on elemental and thermal analyses, spectra [IR, UV-visible, 1H NMR, ESR (f…
Dielectric and magnetic properties of selected rare earth ferrites, LnFe2O4 (Ln=Y,Er,Yb), have been investigated. All these materials show ferroelectricity near the ferrimagnetic transition temperature around 250 K. More importantly, they exhibit a change in the dielectric behavior on the application of magnetic field…
The authors conducted thermoelectric characterizations on polycrystalline samples of ErNi1−xPdxSb (x=0.25, 0.5, and 0.75) to develop p-type half-Heusler thermoelectric materials. All samples prepared here indicated positive Seebeck coefficient (S) values. Variations of the electrical resistivity (ρ) and the S of ErNi1…
The paper reports on the fabrication and characterization of chemically and optically stable silver-based surface plasmon resonance (SPR) interfaces. The SPR interfaces are obtained by a radio frequency (rf) sputtering technique of titanium (Ti), silver (Ag), and indium tin oxide (ITO) targets in one run at ambient te…
Two types of global space-group optimization (GSGO) problems can be recognized in binary metallic alloys A q B 1− q : (i) configuration search problems, where the underlying crystal lattice is known and the aim is finding the most favorable decoration of the lattice by A and B atoms and (ii) lattice-type search proble…
The objective of this study is to examine the influence of poly [styrene-b-(ethylene-co-butylene)-b-styrene] (SEBS) compatibilizer on the morphology and properties of atactic polystyrene/high density polyethylene (aPS/HDPE) blends. The rheological behavior of the blends melt during processing is followed. The concentr…
Cost-effective nanotechnology-based water-repellent treatments for clothing fabrics are now commercially available. The effectiveness of these durable water repellent (DWR) fabric treatments are evaluated for application to military uniforms. The addition of a non-wicking finish to clothing fabric negatively impacts c…
The two major interconnect failure modes most commonly considered in IC technology are electromigration (EM) and time dependent dielectric breakdown (TDDB) in interlevel dielectrics. In order to evaluate reliability, tests must be performed under conditions that are much more severe than those expected under normal us…
This article addresses the response of failed ceramics. Under high-velocity impact, ceramics transition from a solid intact material to a fragmented and granular material. This process is often referred to as “damage and failure” and is a complex phenomenon. Because ceramics are very strong in compression, it is diffi…
Macromolecule crystal structure analyses can be severely hampered by cases of twinning or of lattice disorders or of multiple crystals. However, it is increasingly the case that twinning can readily be recognized and accounted for, or remediations found. A review of this topic is given, covering both the less-than-per…
Excimer formation by pyrene is a well-known process in solution and on solid surfaces. In solution, excimer formation is highly dependent on the concentration of pyrene. When adsorbed on solid surfaces (i.e., silica surfaces), pyrene has been shown to form ground-state pairs which lead to static excimer emission even…
Abstract The Zircobase thermodynamic database for zirconium alloys coupled with Thermo-Calc software represents a powerful tool for prediction of thermodynamic and metallurgical data such as activities, formation enthalpies, phase transformation temperatures, solubility limits, existence temperature range, and chemica…
Thermoelectric properties of Al-substituted Ge clathrate compounds Ba8AlxGe46−x were investigated experimentally and theoretically. Polycrystalline Ba8AlxGe46−x (x=12–18) was synthesized by using an arc melting and a spark plasma sintering technique. The obtained samples show the n-type behavior and the carrier concen…
We have prepared supramolecular assemblies of hexaaryl-anchored polyester zinc(II) porphyrin dendrimers (6P(Zn)W, 12P(Zn)W, and 24P(Zn)W) with various bipyridyl guests (C(n)Py2; n = 1, 2, 4, 6, and 8) through self-assembled coordination to control the structures and photophysical properties. We comparatively investiga…