Materials Literature
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Duplex stainless steels are excellent materials for industrial applications and their use has increased in the oil, chemical, petroleum (offshore), and electric power industries. Pitting resistance equivalent (PRE) is the first parameter used to characterise the pitting and crevice corrosion resistance. Nevertheless,…
The Fermi level for a multiwalled carbon nanotube is determined analytically by using the Fermi velocity obtained from the particle-in-a-box model. Fermi energy is found to be quantized so that the corresponding quantum number coincides with the wall number. In addition, the classical limit is discussed.
Grand canonical Monte Carlo simulations of a simple model semiflexible equilibrium polymer system, consisting of hard sphere monomers reversibly self-assembling into chains of arbitrary length, have been performed using a novel sampling method to add or remove multiple monomers during a single MC move. Systems with tw…
We study via lattice Monte Carlo simulation and Flory theory the properties of g=1-6 dendrimers in variable solvent quality. For all the generations studied, we find that the radius of gyration R(g) collapses significantly (factor of 2) going from athermal to extreme poor solvent conditions, indicating that varying so…
We present a computer simulation study of binary mixtures of prolate Gay-Berne particles and Lennard-Jones spheres. Results are presented for three such rod-sphere systems which differ from each other only in the interaction between unlike particles. Both the mixing-demixing behavior and the transitions between the is…
Abstract In order to modify poly [(3‐hydroxybutyrate)‐ co ‐(3‐hydroxyvalerate)] (PHBV), the crosslinking of this copolymer was carried out at 160 °C using dicumyl peroxide (DCP) as the initiator. The torque of the PHBV melt showed an abrupt upturn when DCP was added. Appropriate values for the gel fraction and crossli…
Molecules 616 22.5 Synopsis of Vitrification Compared with Freezing, and the Advantagesof Vitreous Cryopreservation 620 22.5.1 Avoidance of Ice 620 22.5.2 Advantages of the Vitrification Approach 62122.6 Application to Viable Tissues 621 22.6.1 Corneas 622 22.6.2 Vascular Grafts 622
Corrosion failures due to condensing flue gases containing H 2 O, SO 3 , NO x and HCl still occur more often than might be expected. The corrosion failures can be of several types: general corrosion, pitting attack and stress corrosion cracking (SCC). The chemistry of condensing gases is discussed, and some examples o…
Abstract Polycrystalline CeO2 nanowires have been synthesized via a solution-phase route using sodium bis(2-ethylhexyl) sulfosuccinate as a structure-directing agent. The obtained CeO2 nanowires were 30–120 nm in diameters and 0.2–5 μm in lengths. The CeO2 nanowire consists of many tiny interconnected nanocrystallites…
We study a calcium aluminosilicate glass of composition (SiO(2))(0.67)-(Al(2)O(3))(0.12)-(CaO)(0.21) by means of molecular-dynamics simulations, using a potential made of two-body and three-body interactions. In order to prepare small samples that can subsequently be studied by first principles, the finite size effect…
Recently N. Garcia et al. (Phys. Rev. E 67, 046606 (2003)) theoretically studied several acoustic devices with dimensions on de order of several wavelenghts. The authors discussed on experimental results previously reported by several of us (F. Cervera et al., Phys. Rev. Lett. 88, 023902 (2002)). They concluded that d…
The anomalous Hall effect (AHE) of ferromagnetic thin films of Sr$_{1-x}$Ca$_{x}$RuO$_3$ (0 $\leq x \leq$ 0.4) is studied as a function of $x$ and temperature $T$. As $x$ increases, both the transition temperature $T_c$ and the magnetization $M$ are reduced and vanish near $x \sim$ 0.7. For all compositions, the trans…
Molecular-dynamics simulations have been used to compute thermodynamic and kinetic properties of the solid-liquid interface for both the fcc and bcc phases of Fe. Pure Fe was modeled using two different interatomic potentials of the embedded atom type as well as an effective pair potential. Free solidification simulat…
We report a detailed numerical investigation of a recently introduced two dimensional model for square-to-rectangle martensitic transformation that explains several unusual features of the martensitic transformation. This model includes inertial effects, dissipation, long-range interaction between the transformed doma…
Wound healing is a complex process that often requires treatment with antibiotics. This article reports the initial development of a biodegradable polymeric nanofiber-based antibiotic delivery system. The functions of such a system would be (a) to serve as a biodegradable gauze, and (b) to serve as an antibiotic deliv…
The thermodynamic behavior, the morphology, and the molecular structure of systems prepared from exposure to liquid solvent ( cis- and trans -decalin) of solid isotactic polystyrene samples at different temperatures (4−40 °C) are reported. No significant differences are detected when comparison is made with solution-c…
3-Keto-L-gulonate 6-phosphate decarboxylase (KGPDC), a member of the orotidine monophosphate decarboxylase (OMPDC) suprafamily, catalyzes the Mg(2+)-dependent decarboxylation of 3-keto-L-gulonate 6-phosphate to L-xylulose 5-phosphate. Structural and biochemical evidence suggests that the KGPDC reaction proceeds via a…
High-surface-area SiC has unique mechanical and thermal properties for use as a catalyst and sorbent support. A modified sol−gel route was chosen to synthesize SiC, where the precursor (phenyltrimethoxysilane) was hydrolyzed in the presence of a solvent (methanol) in order to enhance reaction rates and control the por…
Electronic relaxation dynamics of photoexcited CdSe quantum rods have been studied with femtosecond transient absorption spectroscopy. Samples with the same length, ∼30 nm, but with different diameters, 2.5 and 8.0 nm, were investigated. We found that the intraband energy relaxation is about 8 times faster in the thin…
Carbon/gold composite nanotubes as well as gold nanorods were synthesized by the impregnation of porous alumina with diluted hydrogen tetrachloroaurate (HAuCl 4 )/acetone solutions and subsequent thermolysis at moderate temperatures. Gold(III) is reduced, whereas carbon provided by the solvent acetone is oxidized. No…