Materials Literature
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Abstract Composites with several hierarchical structures were prepared by using different clays, compatibilizers, and PPs. TGA showed that the thermal stability of the composites can be strongly improved, under either inert or thermo‐oxidative conditions, depending on the type of clay and its morphology. Drastic incre…
Mind over matter: Electronic structure calculations have been used to establish linear energy relations for chemical reactions on solid surfaces which aid in the design of new catalytic materials. Newly discovered accurate linear relations for the hydrogenation of organic molecules on transition metals suggest that th…
The elastic properties of Cu–Al–Ni single crystals have been studied during forward and reverse martensitic transformation by dynamic mechanical analysis. Measurements were performed for two alloys, occurring in austenitic (Cu–14%Al–4%Ni) and martensitic (Cu–13.7%Al–3%Ni) phases at room temperature. Investigation of e…
The labdane diterpene solidagenone and four semisynthetic derivatives were assessed for effects on the glucocorticoid-mediated signal transduction. Solidagenone and the derivatives proved to be active with IC50 values between 1 and 25 micrograms/mL. All compounds were cytotoxic towards L 1210, BHK and COS 7 cells with…
Abstract Blends of a random poly(propylene) copolymer with different types of polyethylene were used to develop a sample independent statistic mathematical model which describes the quality of phase separation of polymer blends obtained by CRYSTAF. By coupling the abstract model with experimental data, process paramet…
The lead titanate based glass samples were prepared by conventional quenching technique. The Tg, Tc and density of the glass samples were measured. The glass samples were converted to glass ceramics by two stage heat treatment schedule. The dielectric constant has been studied for the glass and glass ceramics. The gla…
Surface-initiated graft polymerization on multi-walled carbon nanotubes pretreated with a corona discharge at atmospheric pressure was explored. The mechanism of the corona-discharge-induced graft polymerization is discussed. The results indicate that MWCNTs were encapsulated by poly(glycidyl methacrylate) (PGMA), dem…
In this paper, microstructure and mechanical properties of welding metals in 610 MPa high strength low alloy (HSLA) were studied after high-heat-input welding. Both the base material and the weld joint proved excellent strength and toughness by vibratory electrogas arc (VEGA) welding under 90 to 100 kJ/cm heat- input.…
Abstract The melt rheological behavior of segmented block copolymers with high melting diamide (A) hard segments (HS) and polyether (B) soft segments was studied. The block copolymers can be classified as B (monoblock), AB (diblock), ABA (triblock, diamide end segment), BAB (triblock, diamide mid‐segment) and (AB) n…
The effects of ion bombardment on polymer surfaces can be profound, with implications for all plasma-based pattern transfer processes that involve the use of polymer etch masks in lithography and etching. We report results from molecular dynamics (MD) simulations of Ar + (100 eV) sputtering of oxygen-containing polyme…
We employed density functional theory (DFT) calculations to explore the manipulation of the electrical and magnetic properties of one-dimensional (1D) bimetallic sandwich molecular wire, (FeCpVCp) ∞, under uniaxial strain. It is predicted that (FeCpVCp) ∞ undergoes ferromagnetic-semiconducting, metallic, and antiferro…
Nephrogenic systemic fibrosis (NSF) has been related to the administration of gadolinium-based contrast agents for magnetic resonance imaging studies in patients with kidney disease. After reviewing the pathophysiology of NSF, we discuss the possible factors contributing to the toxicity of gadolinium in susceptible pa…
We present computer simulations of a simple bead-spring model for polymer melts with intramolecular barriers. By systematically tuning the strength of the barriers, we investigate their role on the glass transition. Dynamic observables are analyzed within the framework of the mode coupling theory (MCT). Critical noner…
This paper reports the surface chemical properties of ca. 20 nm wide domains on a UV-treated thin film of a polystyrene-poly(methyl methacrylate) diblock copolymer (PS-b-PMMA; 0.3 as the PMMA volume fraction). UV irradiation and subsequent acetic acid (AcOH) treatment were used for selectively etching horizontally ali…
Aberration-corrected high-resolution transmission electron microscopy (HRTEM) has been applied to resolve the atomic structure of a complex layered crystal, (PbS)(1.14)NbS(2), which comprises a high density of incommensurate interfaces. The strong suppression of image delocalization and the favourable contrast transfe…
Abstract Functionally graded polymer composites (FGPCs) were prepared by construction based layering method employing natural rubber (NR) as a matrix and carbon black (CB) in graded form. CB particles were graded along the rectangular geometry polymer matrix comprising the variation of particle volume fraction along t…
Abstract Azobenzene monomeric precursors bearing piperazine as donor moiety with different withdrawing groups and derived side chain polymethacrylates have been prepared and characterized. Monomers having terminal cyano or nitro groups, and the corresponding polymers, exhibited smectic A phases. Linear and nonlinear o…
We measure resonant Raman scattering from 11 individual C(60)-derived double-wall carbon nanotubes all having inner semiconducting (6,5) tubes and various outer metallic tubes. The Raman spectra show the radial breathing modes (RBM) of the inner and the outer tubes to be simultaneously in resonance with the same laser…
The manganese(V)-nitrido polyoxometalate derivative [PW(11)O(39){Mn(V)N}](5-) has been synthesized by photochemical activation of the parent manganese(III)-azido derivative [PW(11)O(39)Mn(III)N(3)](5-). It was characterized by mass spectrometry, (31)P NMR, UV-vis, and IR spectroscopies. An electrochemistry study indic…
Abstract Deep Level Transient Spectroscopy (DLTS) and Laplace DLTS (LDLTS) techniques have been employed to study defects in n‐type GaAs grown by MBE on (100) and (211)B GaAs planes. The DLTS spectra were different for the two GaAs substrate orientations. Five and four defect states are found in samples grown on (100)…