Materials Literature
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We utilize spin-casting and ultraviolet (UV) light-induced polymerization to make organic−inorganic nanocomposite thin films. The initial mixture consists of polycaprolactone (PCL) stabilized gold nanoparticles, reactive monomer alkoxytitanium triacrylate, and photoinitiator benzophenone, dissolved in n -butyl acetate…
Reaction of Ti[N(But)Ar]3 (Ar = 3,5-C6H3Me2 or Ar' = C6H5) with CO2 at -40 degrees C produces diamagmetic Ti(III) paddlewheel complexes with long Ti-Ti separations (>3.4 Angstrom), thus excluding direct Ti-Ti bonding. 1H NMR spectroscopy shows that the compounds are diamagnetic in solution in the temperature range of…
Magnetomechanical coupling factor, piezomagnetic d-constant and magnetic permeability are reported as a function of magnetic field and applied stress for stress annealed Fe-Ga and Fe-Al alloys. Magnetic field dependences of the samples were measured as a function of the intrinsic saturation flux density (Js), lowest o…
Many utilities are focusing their efforts on developing methods to assess the condition of equipment to extend the life of existing infrastructure. In many cases, these utilities focus their efforts on extending the life of power transformers and paper-insulated lead-covered (PILC) cables because these components offe…
By means of dielectric spectroscopy, the segmental dynamics (α-relaxation) of four different polymers (poly(vinyl acetate), poly(vinyl methyl ether), poly(vinyl chloride) and poly( o -chlorostyrene)) was mea-sured over a broad range of frequencies (10 -1 −10 7 Hz), pressures (0−300 MPa), and temperatures (240−460 K).…
Conventional Cu-ultra low K (ULK) integration schemes lead to a drastic increase of the effective dielectric constant due to porous material degradation during process steps. Although a postintegration porogen removal scheme allows overcoming these issues, only spin-on dielectrics were developed to validate this appro…
When most proteins undergo oxidative damage, they yield a variety of products containing oxidative damage at a large number of sites, most of which are modified substoichiometrically. The resulting complex mixture of products is not amenable to high-resolution structural analyses. The previous methods of structural an…
Attempts to produce Zn analogues of the structural model complexes [M2(mu-O2CR)2(O2CR)2(mu-H2O)(tmen)2] (M = Ni, Co, Mn; R = CH(3), C(CH3)3, CF3) by the reaction of a series of zinc carboxylates with N,N,N',N'-tetramethylethylenediamine (tmen), resulted in the mononuclear complexes [Zn(OAc)(2)(tmen)] (1) and [Zn(crot)…
In the absence of weak boundary layers, surface energy can be an excellent indicator of the suitability of a fiber-reinforced composite surface for adhesive bonding. Mechanical surface treatments such as grit blasting are effective and commonly used to prepare composite surfaces, but the roughness introduced by these…
We have undertaken a detailed analysis of the X-ray photoelectron spectra obtained from the three polymorphs of Al 2 SiO 5 ; andalusite, sillimanite, and kyanite. Comparison of the spectra was made based on the chemical bonding and structural differences in the Al- and Si-coordination within each polymorph. The spectr…
Abstract The structure and the electrical properties of porous and dense liquid-phase sintered silicon carbide ceramics (LPS-SiC), containing yttria and alumina additives, have been studied. The electrical resistance of LPS-SiC-materials varies in a wide range. This paper is focused on the influence of porosity on the…
The Au nanoparticles have been synthesized in the presence of micellar solutions of fixed concentration (i.e. 1.4 x 10(-3) mol dm(-3)) of each poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide), triblock polymers (TBP), such as P103, P84, P123, and F127. The nanoparticles have also been synthesized in the…
ABSTRACT: Casein precipitated with high pressure‐CO 2 (CO 2 CAS) has unique properties compared to commercial acid‐precipitated casein. CO 2 CAS is less water‐soluble and films made from it are less susceptible to high humidity environments; however, the films are also opaque and hazy. The appearance of CO 2 CAS films…
A series of segmented polyurethane (PU) were prepared using five different polyols and hexamethylene diisocyanate (HDI) as mixing soft segment, 4,4′-diphenylmethane diisocyanate, hydrophilic segment poly (ethylene glycol) 200 (PEG 200) and chain extender 1,4-butanediol (1,4-BDO) as triblock hard segment. The micro-str…
Two new chiral liquid crystalline monomers with bilactate or trilactate chiral units were synthesized and studied. The monomers show the paraelectric SmA and ferroelectric SmC∗ phases. The antiferroelectric phase was detected only for the monomer possessing the bilactate unit. The temperature dependences of the sponta…
Monte Carlo calculations of copper atom diffusion via the vacancy mechanism in bcc iron are presented. The activation energy of atomic jumps is taken from recent ab initio calculations. It is shown that the vacancy–copper atom cross-diffusion coefficient is positive at all temperatures, for which the bcc crystal struc…
An artificial dielectric medium comprising two sublattices of spherical particles made of a high-dielectric-constant (high-ε) material, which are embedded into a low-ε dielectric matrix, are considered. Particles belonging to different sublattices have different diameters. It is shown that the properties of this compo…
The structural properties, thermal stability, thermal expansion, and electrical properties of the RBaCuFeO 5+δ (R = Y, La, Pr, Nd, Sm-Lu) layered ferrocuprates have been studied systematically. The linear thermal expansion coefficients of the RBaCuFeO 5+δ phases are ≃ 13 × 10 −6 and ≃ 13 × 10 −6 K −1 for R = La-Eu and…
A mechanical model of liquid crystals (LCs) is applied to study the polymorphism of homologous series of terphenyl compounds. With a semi-experimental molecular orbit method, we calculate the moment of inertia which represents the rotation state to describe the phase transition temperature obtained from experimental d…
Effect of ZnO, SrO, and La 2 O 3 additions on properties of lead zirconate titanate (PZT) nanopowder were investigated. Our objective was to densify PZT near 900°C to reduce lead loss and increase processing compatibility of these materials with IC fabrication technique for micro‐electro‐mechanical systems (MEMS). PZT…