Materials Literature
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Since their discovery in the early 1990s, the interest in carbon nanotube (CNT) electronics has exploded. One main factor that controls the device performance of CNT field-effect transistors (CNT MOSFETs) is the electronic structure of the nanotube. In this paper we use three different bandstructure models: 1) extende…
This paper reports the orientation-dependent optical properties of two-dimensional arrays of anisotropic metallic nanoparticles. These studies were made possible by our simple procedure to encapsulate and manipulate aligned particles having complex three-dimensional (3D) shapes inside a uniform dielectric environment.…
New nuclear highly durable glass compositions, able to immobilize a higher concentration of high-level nuclear wastes than current borosilicate nuclear glasses, are being studied. Investigations are performed on rare earth (RE)-rich glasses, known as durable matrices. After a preliminary study on complex and simplifie…
A method for predicting XPS C1s binding energies in polymers has been developed previously [1]. The calculation uses partial atomic charges determined quantum chemically (by the semi-empirical AM1 Method), which are found to provide a linear correlation with the binding energies corrected by the so-called Madelung int…
Kinetics of phosphating MA 21 magnesium-lithium alloys in a zinc-nitrate-phosphate solution (0.25 M Zn2++0.34M PO 4 3− +0.17M NO 3 − +0.02M F−, pH = 2.7) at 25°C is studied with various surface preparation procedures. The effect of the alloy surface pretreatment in titanium-containing activating solutions on the elect…
Crystals of a new rare-earth borate, LaB 5 O 8 (OH) 2 (space group P 2 1 / n ), are synthesized under hydrothermal conditions. The crystal structure is determined by the heavy-atom method without prior knowledge of the chemical formula. The radical anion is a layer composed of pentaborate blocks 5[3 T + 2Δ]. The topol…
Abstract The synthesis of new isocyanate monomers and their polymerization by anionic route is reported. Reaction of 1,6‐diisocyanatohexane with aliphatic alcohols such as methanol, n‐propanol and n‐pentanol in 1:0.5 molar ratios was carried out in the presence of pyridine such that one NCO group remained unreacted.…
The recent trends in the synthesis, characterization, and application of thiophene-containing polymers are surveyed. This review covers methods used for the synthesis of polythiophene and thiophene-based copolymers via oxidative dehydropolycondensation as well as electrochemical and metal-catalyzed polycondensations.…
The canonical mapping transformation (CMT) theory has been generalized to nonmeridional (skewed) rays. It has been derived that with minor mathematical modification a CMT optical parameter, “electron gun focal length,” can be applied to skewed rays. The generalization makes it possible to characterize the behavior of…
A method to obtain the effective diffusion coefficient of the gas contained in closed cell polyolefin foams under static loading is presented. This property is obtained from pressure decrease with time using an analytical solution of the diffusion equation. The effect of density, type of base polymer, crosslinking and…
Phase equilibria in the ternary system ZrO2-Y2O3-La2O3 at 1250 °C have been studied and isothermal section have been developed. Fine chemical technique such as co-precipitation was used to obtain ceramic nanopowders (with average particle size of 8-20 nm) available for nonisothermal sintering as well. The phase compos…
Inactivation of soybean urease in aqueous solution at pH 5.4, 36 degrees C, and high-frequency sonication (2.64 MHz, 1.0 W/cm2) is substantially reduced in the presence of seven structurally different flavonoids. A comparative kinetic study of the effect of these flavonoids on the effective first-order rate constants…
Bi 6 Ti 3 WO 18 is a ferroelectric phase which belongs to the Aurivillius family like Bi 4 Ti 3 O 12 or Bi 2 WO 6 layered phases. The present work is focused on the study of the sintering behaviour as well as on the electric and ferroelectric properties of this m = 2 Aurivillius phase. Ceramic samples were obtained by…
The increasing availability of structurally aligned protein families has made it possible to use statistical methods to discover regions of interpositional dependencies of residue identity. Such dependencies amongst residues often have structural or functional implications, and their discovery can supply valuable cons…
In Brief Purpose: The historical extrusion/explantation rate of silicone sponge scleral buckle exoplants is 3.5 to 24.4%. This contrasts with the published 0.6 to 1.2% explantation rate of solid silicone elements. Previously reported silicone sponge exoplants studies were noncircumferential (quadrantic or multiple). T…
The rubbing angle effect on transmissive in‐plane switching liquid crystal displays is analysed by the Jones matrix method. Simulation results show that the optimum rubbing angle is around 30°–40°; the cell gap/birefringence product (dΔn) is about 0.33 µm. Increasing the rubbing angle can shorten the rise time and enl…
Chemical vapor deposition (CVD) diamond is known for its superior characteristics such as hardness, toughness and wear resistance. However, due to these factors, machining CVD diamond is a difficult material removal process. A new technique to polish CVD diamond film efficiently is reported in the present paper. In th…
Abstract Three‐ and four‐arm star‐block copolypeptides, (BL‐b‐G) 3 and (G‐b‐BL) 4 , of poly(ε‐butyloxycarbonyl‐L‐lysine) (BL) and poly(γ‐benzyl‐L‐glutamate) (G), were synthesized under high vacuum conditions, using three different multifunctional amino‐initiators for the ring opening polymerization of the correspondin…
Abstract Amorphous boron rich nanowires are grown on ZrB 2 particles using diborane as the gas precursor in a CVD process under 20 Torr pressure and at 900 °C. These nanowires have uniform diameters of tens of nanometers and lengths of up to several micrometers. The boron‐rich nanowires are characterized and found to…
Abstract Well-ordered Sn4+-incorporated mesoporous silica SBA-15 samples have been synthesized from tetraethyl orthosilicate (TEOS) and SnCl4 (Si/Sn = 114–15) using nonionic surfactants under a slightly higher pH medium (optimum H2O to HCl molar ratio) and characterized by XRD (an increase in lattice parameter), TEM (…