Materials Literature
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The multinuclear complexes 1,3,5-[ trans -I(Et 3 P) 2 PtC≡C] 3 C 6 H 3 ( 1 ) and 1,2,4,5-[ trans -I(Et 3 P) 2 PtC≡C] 4 C 6 H 2 ( 2 ) were prepared via σ-acetylide synthetic methodologies by reaction of tri- and tetraethynylbenzene with diiodobis(triethylphosphine)platinum. The combination of this synthetic coupling st…
The nuclear and magnetic structures of ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{MnO}}_{3}$ have been studied by neutron powder diffraction methods for the compositions $x=0.06,$ 0.15, 0.175, 0.25, and 0.33. At low concentrations of Ca $(x=0.06)$ the oxidized sample contains cation vacancies and the s…
The structure of sodium tetrasilicate (Na 2 Si 4 O 9 ) glasses containing 0 to 10 wt% water was investigated by a combination of Raman, IR, and NMR methods. Both the 29 Si magic angle spinning NMR data and Raman spectra in the Si-O stretching region clearly show that water depolymerizes the silicate network of the gla…
Two‐phase composites consisting of LaPO 4 or CePO 4 and alumina, mullite, or zirconia were found to be machinable; i.e., they can be cut and drilled using conventional tungsten carbide metal‐working tools. Single‐phase LaPO 4 was also machinable. Measurements of drilling rates, grinding rates, and normal forces are us…
Human transferrin was covalently coupled to ultrasmall superparamagnetic iron oxide (USPIO) particles, and the transferrin-USPIO obtained was investigated in vivo in experimental SMT/2A tumor-bearing rats (rat mammary carcinoma). Physicochemical characterization showed an overall size of 36 nm (DLS) with a core size o…
Abstract Biodegradable polymers are by definition those that degrade as a result of the action of microorganisms and/or enzymes. The rate of this biodegradation may vary from hours to years depending on the molecular architecture of the polymer in question. Biopolymers like lignin take years to degrade while many prot…
Scanning electrochemical microscopy with submicron resolution shows that the local current density for dissolution of certain MnS inclusions in stainless steel can be extremely high (>1 A cm −2 and appears to be chloride‐catalyzed, a result not anticipated by previous work on chemically prepared MnS. The dissolution f…
A wettability gradient was prepared on lowdensity polyethylene (PE) sheets by treating them in air with a corona from a knife-type electrode the power of which increased gradually along the sample length. The PE surfaces oxidized gradually with the increasing corona power and a wettability gradient was created on the…
We model the collapse of a bubble by taking into account all the energy forms involved (i.e., mechanical, thermal, chemical, and radiative) and compare the calculated radical yields with sonochemical data in H 2 O. Water decomposition plays a critical role in the energy balance, but trails equilibrium even in bubbles…
▪ Abstract Perovskite, ferroelectric and paraelectric, thin films exhibit outstanding dielectric properties, even at high frequencies (>1 GHz). This feature makes films such as (Ba,Sr)TiO 3 and Pb(Zr,Ti)O 3 ideally suited for a wide range of capacitor applications, particularly decoupling capacitors and tunable mic…
Abstract The surface properties at the interface between thermoplastic and cellulosic fibers strongly influence the mechanical properties of plastic/cellulosic fiber composites. This paper examines the role of surface acid‐base properties of plasticized PVC and cellulosic fibers on the mechanical properties of the com…
Ultralarge sale integrated circuit designs require multiple metal wiring layers for the formation of the device interconnections. Surface planarization and the deposition of high quality insulating films are critical fabrication steps related to the manufacture of these circuits. Planarization and dielectric depositio…
We report generalized stacking fault (GSF) curves along the [121] and [110] directions for Pd and Al, calculated from first principles. The GSF curves are applied in the classic PN model to calculate Peierls barriers and stresses for the Shockley partials and the unsplit edge dislocations in Pd and Al. The obtained st…
This article presents a review of recent important developments in the field of intelligent material systems. Intelligent material systems, sometimes referred to as smart materials, can adjust their behavior to changes of external or internal parameters analogously to biological systems. In these systems, sensors, act…
We present an optical reflectance and Raman-scattering study of the ${A}_{1\ensuremath{-}x}{A}_{x}^{\ensuremath{'}}{\mathrm{MnO}}_{3}$ system as a function of temperature and doping $(0.2<~x<~0.5).$ The metal-semiconductor transition in the ${A}_{1\ensuremath{-}x}{A}_{x}^{\ensuremath{'}}{\mathrm{MnO}}_{3}$ syste…
▪ Abstract Cathodic arc deposition is a plasma-based technology for the fabrication of films. The process can be carried out either at high vacuum or in a low pressure gaseous environment, and films can be formed for example of metals, ceramics, diamond-like carbon, some semiconductors and superconductors, and more. T…
Simultaneous small-angle scattering and in situ dynamic mechanical measurements offer an excellent opportunity to relate the macroscopic dynamical mechanical response of block copolymers and their mesoscopic structural behavior. We use small-angle neutron scattering and rheology to examine the ordered phases and the o…
The multiple-step transformation is a special case of martensitic transformation observed in NiTi alloys. It is characterized by the appearance of several transformation steps during the transformation of the R phase into martensite. The present study shows that this effect can be observed after the sample has been so…
We have performed electron spin resonance (ESR) and dc susceptibility measurements in Mn perovskites up to 1000 K. Assuming an effective Heisenberg-like interaction for ${\mathrm{Mn}}^{3+}\mathrm{\ensuremath{-}}{\mathrm{Mn}}^{4+}$ spin pairs, the dc susceptibility, ${\ensuremath{\chi}}_{\mathrm{dc}}(T),$ is well descr…
We report the results of resonant x-ray diffraction at the sulfur $K$-edge performed upon free-standing films of a thiobenzoate liquid-crystal compound. Our data provide the first direct structural evidence of distinct periodicities in several chiral Sm-C phases, including 2-layer, 3-layer, and 4-layer superlattices i…