Materials Literature
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We investigate the slow dynamics in gelling systems by means of Monte Carlo simulations on the cubic lattice of a minimal statistical mechanics model. By opportunely varying some model parameter we are able to describe a crossover from the chemical gelation behaviour to dynamics more typical of colloidal systems. The…
The cubic titanosiloxane [RSiO(3)Ti(OPr(i))](4) (R = 2,6-Pr(2)(i)C(6)H(3)NSiMe(3)) (1) is found to be relatively inert in its attempted reactions with alcohols and other acidic hydrogen containing compounds. The reaction of 1 with silanol (Bu(t)O)(3)SiOH however proceeds over a period of approximately 3 months to resu…
The concept of polymerization-induced phase separation with hydrogen-bonded supramolecular polymers was investigated by the photopolymerization of films containing mixtures of supramolecular polymer 1a or 1b and varying amounts of monoacrylate and diacrylate with UV-A (320−400 nm) radiation (5 W/cm 2 ) for 0.3 s. The…
The cavitation corrosion behavior of 20SiMn low-alloy steel in both distilled water and 3% sodium chloride (NaCl) solution was investigated using a magnetostrictive-induced cavitation facility. The micrographs of damaged surfaces were observed with a scanning electron microscope (SEM). The role of corrosion was analyz…
We consider orientation mechanisms for block copolymers in an electric field. Theoretical and experimental studies have shown that nonuniformity of the dielectric constant gives rise to a preferred orientation of the melt with respect to the applied field. We show that the presence of ions, as found in anionically pre…
An investigation was performed to determine whether corrosion resistant boron-free E-glass fibers could adequately prevent acid induced brittle fracture failures of high voltage composite insulator rods. Nine different rod compositions were tested at 45% of mechanical failure load in contact with 1 N nitric acid. Rods…
We predict the thermodynamic and structural behavior of solutions of self-assembling chains, cross-links and end-cap molecules. We find that at the mean-field level, the entropy of self-assembled junctions induces an effective attraction that can result in equilibrium between a sol phase and a connected network. A con…
Abstract Crosslinked poly[styrene‐ co ‐(furfuryl methacrylate)] has been produced by the Diels–Alder (D‐A) reaction between the furan ring (within the copolymer) and the maleimide (MI) group (within the other reactant, bismaleimide). The retro D‐A reaction was followed by the analysis of MI groups produced at differen…
Luminescent [(NH(3))(4)Pt][Au(CN)(2)](2).1.5(H(2)O), which forms from aqueous solutions of [(NH(3))(4)Pt]Cl(2) and K[Au(CN)(2)], crystallizes with extended chains of the two ions with multiple close Pt...Au (3.2804(4) and 3.2794(4) A) and Au...Au (3.2902(5), 3.3312(5), and 3.1902(4) A) contacts. Nonluminescent [(NH(3)…
The crystal structure of a small, basic DNA binding protein, Sso10b2, from the thermoacidophilic archaeon Sulfolobus solfataricus was determined by the Zn multiwavelength anomalous diffraction method and refined to 1.85 A resolution. The 89-amino-acid protein adopts a betaalphabetaalphabetabeta topology. The structure…
Abstract The molecular design of semi‐inorganic polymers has produced polysilphenylene–siloxane and polyphosphazene elastomers having comparable fire safety to heat resistant engineering plastics. In flaming combustion a polyphosphazene rubber had a four times lower peak heat release rate than the polyurethane elastom…
D-Hydantoinase (D-HYD) is an industrial enzyme that is widely used in the production of D-amino acids which are precursors for semisynthesis of antibiotics, peptides, and pesticides. This report describes the crystal structure of D-hydantoinase from Burkholderia pickettii (HYD(Bp)) at a 2.7-A resolution. The structure…
Abstract The recent emergence of organic electrochromics on both the scientific and industrial levels has expedited the synthesis of new materials with varied electrochemical and optical properties. The structural versatility and broad usage of poly(3,4‐ethylenedioxythiophene) (PEDOT) has stimulated many research grou…
Over the past two decades and in particular the past five years, numerous sandwich-type rare earth complexes containing naphthalocyanine ligands have been synthesized. The more extended delocalized π-electron system of naphthalocyanine in comparison with phthalocyanine generates unique physical, spectroscopic, electro…
Anisotropic strain gradient elasticity theory is applied to the solution of a mode III crack in a functionally graded material. The theory possesses two material characteristic lengths, l and l′, which describe the size scale effect resulting from the underlining microstructure, and are associated to volumetric and su…
By examining natural-abundance 13 C and 15 N solid-state nuclear magnetic resonance (NMR) spectra of acid-precipitated chloroquine−ferriprotoporphyrin IX (CQ−FPIX) aggregates, the first direct evidence is provided for CQ−FPIX complexes in the solid state, formed in a physiologic aqueous solution that mimics the enviro…
Abstract Raman spectroscopy has been the most extensively employed method to study carbon nanotubes at high pressures. This review covers reversible pressure‐induced changes of the lattice dynamics and structure of single‐ and multi‐wall carbon nanotubes and irreversible transformations induced by high pressures. The…
Abstract The effect of a particle marble filler on the creep response of a crosslinked polyester matrix before and after physical aging is described. Composites with various filler–polyester matrix percentages are prepared by applying mixing technology, curing at room temperature, and postcuring above the glass‐transi…
Abstract The presence of biofilm modifies the electrochemical properties of the interface and the mass transport near the interface. Two biofilm effects are damageable: the reduction of heat and/or mass transfer and the biocorrosion or microbiologically influenced corrosion (MIC). Two kinds of electrochemical sensors…
Ralstonia eutropha accumulates poly(β-hydroxybutyrate) up to 80% of its dry weight (as a carbon andenergy source) and is the best-known PHB producer. Although PHB has many potential applications in medicine, veterinary practice, agriculture and surgery, its high cost limits the widespread use of it. The recentresearch…