Materials Literature
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Abstract Nose and wing leading edges for future generations space vehicles will withstand very high temperature in an oxidizing environment. UHTC (Ultra High Temperature Ceramics) materials are very promising candidate materials for such applications. An innovative, proprietary methodology was developed to produce, by…
Abstract The multifunctional effect of the dihydrogen phosphate of ε‐aminocaproic acid (DHPh ε‐ACA) on isoprene rubber compounds is presented in this paper. DHPh ε‐ACA is the product of interaction of polymeric, oligomeric or monomeric ε‐aminocaprolactam and phosphoric acid, with an excess of the acid. This interactio…
The relationship between the behaviour at melting and the range and softness of interatomic potentials is explored using Monte Carlo simulations of bulk Morse and Lennard-Jones systems. The range parameter of the Morse interaction is tuned to mimic the variation seen in atomic systems, from metallic systems with soft,…
Abstract The effects of polypropylene (PP)–barium sulfate (BaSO 4 ) interfacial interaction on the crystallization and melting behaviour of PP/BaSO 4 composites were investigated by means of differential scanning calorimetry. The results show that BaSO 4 can act as nucleating agent and the nucleation activity increase…
Glutamic acid removal in the activated sludge process is studied herein, primarily the formation of storage polymers under dynamic conditions. The activated sludge process was operated by using a sequencing batch reactor (sludge age of 6 d) fed with a synthetic mixture of readily available carbon sources, including gl…
Abstract Polyaniline emeraldine base (PANI‐EB) powder was synthesized by oxidative polymerization of aniline. The PANI‐EB films were prepared by the solution‐casting technique. The temperature‐dependent dc conductivity measured in the range 173–303 K suggests that the PANI‐EB is a quasi‐one‐dimensional disordered cond…
Abstract Thin films of layered manganese oxides with alkylammonium and alkali-metal ions in the interlayer were formed on a platinum electrode by a one-step electrochemical route. The interlayer distance was determined by the size of the electrolyte cations used.
Abstract The products and mechanism of the thermal oxidative degradation at 180 °C and the photo‐oxidative degradation at 40 °C of polytetrahydrofuran have been investigated using 1 H NMR, 13 C NMR and GPC. The NMR analysis was assisted by the use of DEPT 13 C spectra, two‐dimensional NMR spectroscopy (COSY, HMQC and…
White rice husk ash (WRHA) and black rice husk ash (BRHA) were incorporated as filler in natural rubber (NR) compounds. A conventional vulcanization system (CV) was chosen and cure studies were carried out on a TI-100 Curometer at 150, 160, 170 and 180°C. From the rheometric data obtained at 150°C, a specific constant…
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…