Materials Literature
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Abstract Crosslink distributions in gum natural rubber (NR)/ cis -poly(butadiene) (BR) blend vulcanizates have been studied previously for cure states ranging from times shortly after the onset of cure to over-cure at 150 and 175 °C, respectively. The effects of lower cure temperatures on the crosslink distributions t…
A new nomenclature for the crystalline phases present in a sequence of structural phase transitions occurring as a function of temperature and/or pressure is dened as a rst step in presenting a unied and informative notation for the various phases appearing in a phase diagram. This nomenclature species in a compact bu…
The octamer motif (ATTTGCAT) present in several eukaryotic promoters and enhancers is now known to influence the transcription of several genes by interacting with members of a broad family of homeodomain proteins. The promoter of the human class II MHC gene HLA-DRA contains a conserved octamer element that can bind (…
Spontaneous polarization, P s , dielectric constant, ε s , and piezoelectric constant, d i j , at a given composition and temperature were calculated for all compositions of the Pb(Zr 1- x Ti x )O 3 system using phenomenological thermodynamics and compared with experimental data by considering the domain effect. In th…
We report experimental evidence for a weak first-order nematic-nematic transition in thin ( ∼ 1–2 μm) cells of the strongly polar nematogen, p -cyanophenyl p - n heptylbenzoate. The transition temperature T NN increases as the thickness of the cell decreases indicating that, in the bulk, this transition may occur at t…
The phase content of a low-density polyethylene was studied by analysis of the CH 2 rocking vibrations in non-oriented films prepared from the press (P-films) or from solution (S-films). Spectral simulations of the transmission spectra give the mass fractions of the orthorhombic phase α ortho and of two noncrystalline…
Amphoteric surfactants play an important role for the formulation of cosmetical shampoos. In recent years they find also increasing interest as for the development of dishwashing agents or household cleaners. The following article intends to demonstrate as simply as possible the chemical background of the mainly used…
Ultraviolet (UV) blocking filters are needed for atomic flux imaging in environments where high levels of ultraviolet radiation are present. Freestanding gratings are a promising candidate for UV filtering. They have a high aspect ratio (∼13), narrow (∼40 nm) slots, and effectively block UV radiation. The grating fabr…
The low frequency (LF) dielectric constant was studied as a function of temperature in the Schiff 's base liquid crystalline compounds of N (p - n -alkoxybenzylidene)- p - n -alkylanilines with the applied field parallel to the director to determine the phase transition temperatures and the underlying dipolar associat…
A surface reaction model for the catalyzed reaction A+(12)B2→AB is studied by means of Monte Carlo simulations. Motivated by experiments on the catalytic oxidation of CO on certain Pt surfaces; i.e., A≡CO, B2≡O2, and AB≡CO2; it is assumed that the catalyst surface undergoes reactant’s induced reversible phase transiti…
Abstract Binary blends of two random copolymers, ethylene‐vinyl‐alcohol (EVOH) consisting of different ethylene contents, and copolyamide‐6/6.9 with an approximate 1:1 comonomer ratio, have been prepared via blown film extrusion as films, 20 μm thick. Thermal, dynamic‐mechanical, and rheological properties were determ…
Single crystals of quaternary solid solution compositions of A-site filled tungsten bronze-type α(Ba1−xSrx)Nb2O6:β(Na1−yKy)NbO3 (where α:β=2:1, 9:2, x=0.75, 0.60, and y=0.50, 0.40, and 0.25) have been grown by the laser heated pedestal growth technique, both along the a axis and the c axis. The crystal growth studies,…
RATIONALE AND OBJECTIVES: Many magnetic resonance imaging (MRI) agents are Gd(III)-based; its half-filled f-shell has an S-ground state and hence a long electronic relaxation time, leading to comparably large effects on 1/T1 and 1/T2 of water protons with no shift in the water-proton resonance frequency. 1/T1 and 1/T2…
This paper describes a novel way to prepare the ternary phase Ti 3 SiC 2 in a single‐step procedure that we call electron‐beam‐ignited solid‐state reaction (EBI‐SSR). The preparation route is discussed by means of an isothermal section of the Ti‐Si‐C phase diagram. Properties such as the Vickers hardness and the elect…
A series of planned tritium release experiments into the Tritium Systems Test Assembly (TSTA) tritium processing rooms (3000 m3), were performed under the US-Japan collaboration program at Los Alamos National Laboratory (LANL). These experiments were carried out to acquire data on the behavior of tritium in an actual…
Solid‐state reactions between thin films of nickel oxide (NiO) that had been grown on four different orientations of alpha‐alumina (alpha‐Al 2 O 3 ), each with an intermediate layer of spinel, have been studied by using electron microscopy. The starting reaction geometry consists of a nickel aluminate (NiAl 2 O 4 ) bu…
A microcalorimetric technique has been developed to measure crystal-growth kinetics and enthalpies of crystallization. The enthalpy of crystallization of hen egg-white lysozyme in 0.1 M acetate buffer at pH 4.6 was determined at 287 K using this technique. The enthalpies were directly measured to be -14.3 +/- 2.0 and…
In recent years, considerable attention has been focused on polymer miscibility and Complexation due to hydrogen bonding. Monodisperse, proton-donating polystyrene (PS), that is, poly{styrene-co-[p-(2-hydroxypropan-2-yl)styrene]} [PS(t-OH)], was synthesized via chemical modification of polystyrene. Poly[n-butyl methac…
Addition of tungsten to duplex stainless steels (DSS) is known to suppress formation of the brittle secondary phases that may have a negative effect on general corrosion and stress corrosion cracking (SCC) properties. The effects of tungsten addition to DSS on microstructural, electrochemical, and SCC properties were…
Applying the augmented spherical wave method, the Heusler alloy Fe3-x Mn x Si is studied for integer values of x where it forms fairly well ordered intermetallic compounds. In our calculation we allow for non-collinear spin ordering. It is found that the magnetic ground state changes from a ferromagnet for Fe3Si to a…