Materials Literature
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Abstract Plasticizer (vegetable or parafinic oil) pretreated carbon black is mixed with rubber for its compounding. It is observed that the extent of cure obtained from rheometric torque decreases linearly with an increase in vegetable oil content. The presence of a coupling action and a monolayer (microplasticization…
The first synthesis of well-defined narrow molecular weight (MW) distribution macrocyclic poly(2-vinylnaphthalene) (P2VN) containing a single 1,4-benzylidene or 9,10-anthracenylidene unit is reported. The synthesis involves the potassium naphthalide (K-Naph) or potassium 1,1,4,4,7,7,10,10-octamethyl-1,2,3,4,7,8,9,10-o…
We prove a general rigidity result for the maximal possible number of gradients by showing that any lipschitz function using four pairwise not rank-one connected gradients is necessarily affine. This exhibits an interesting difference between rigidity features of approximate and exact solutions of differential inclusi…
A modular synthetic strategy for the construction of cofacial porphyrin architectures bearing hydrogen-bond synthons on a xanthene platform is presented. The convergent approach is based on a xanthene aldehyde-ester building block that is easily obtainable on a multigram scale with minimal purification. Treatment of t…
Aluminum nitride-type species were prepared on porous alumina and silica by repeated separate, saturated reactions of gaseous trimethylaluminum (TMA) and ammonia with solid substrates. Reaction cycles of TMA at 423 K and ammonia at 823 K were performed up to six times. Growth per cycle was on average 2.4 AlN units/nm…
Abstract Many of the fields that have been discovered recently in the West African deep-offshore will produce acidic crudes associated with gas containing a high concentration of CO2. During the oil production process, a pH increase due to decompression and carbon dioxide degassing may generate surface-active naphthen…
Silica gels usually show the phenomena of syneresis. The gels shrink with time after preparation. This process is also observed with the gels that are prepared with the new Si precursor silicic acid tetrakis(2-hydroxyethyl) ester. It is shown that the shrinkage of the gels can be prevented if the cationic precursor N…
The combination of in situ surface plasmon resonance spectroscopy (SPS) and surface plasmon field-enhanced light scattering (SPLS) with an electrochemical method was used to simultaneously investigate the optical and electrochemical properties of polyaniline films on a planar gold electrode. First, the electropolymeri…
The combination of electrochemistry with surface plasmon resonance (SPR) has been used to characterize the growth of polyaniline (PAn) on a gold electrode surface during potential cycling. Potential-modulated SPR characteristics of the PAn film were also revealed. The potential switch between the oxidized and reduced…
Abstract The adsorption and desorption potential of inhibitors to crystal nuclei has never been determined at the extremely low, threshold levels that are known to inhibit nucleation. An extensive study of adsorption and desorption isotherms of four phosphonates on barite or calcite are tested over a wide range of sol…
Abstract Inhibitor performance in terms of the minimum inhibitor concentration (MIC) or the threshold concentration required to prevent scale is the most important aspect for scale control additives. The laboratory test protocols adopted throughout the industry are very similar and are based upon static "bulk" inhibit…
Mathematical modeling of three-way catalytic converter (3WCC) operation is increasingly employed in automotive catalyst and converter systems optimization. Oxygen storage is known to strongly affect catalytic converter operation under real world transient operating conditions. This paper presents a modeling approach e…
Abstract Structure–property relationships in poly(urethane urea)s synthesized with ultra‐low monol content poly(propylene glycol) soft segments were investigated as soft segment molecular weight (2000, 4000, and 8000 g/mol) and hard segment content (6.3 and 9.0 wt %) were varied. Morphological features such as interdo…
In an effort to gain insight into the effect of carbon nanotube confinement on reaction enthalpies and activation energies, calculations using hybrid density functional theory have been carried out for the Menshutkin S N 2 reaction in gas phase and inside carbon nanotubes. The polarizability of the carbon nanotubes pr…
One-dimensional quasilattices are classified into mutual local-derivability (MLD) classes on the basis of geometrical and number-theoretical considerations. Most quasilattices are ternary, and there exist an infinite number of MLD classes. Every MLD class has a finite number of quasilattices with inflation symmetries.…
Different liquid routes have been used to prepare Eu 3+ -activated YPO 4 phosphors. These materials have been compared with conventionally obtained YPO 4 . For the first time (to our knowledge), a specific sol−gel approach has been developed to produce this material. All phases have been checked with X-ray diffraction…
Water adsorption on a ${\mathrm{PuO}}_{2}(110)$ surface is studied using a periodic model with both the local-density approximation (LDA) and the generalized gradient approximation (GGA) of density-functional theory. The 60 core electrons of the Pu atom are represented by a relativistic effective core potential, and s…
We present a combined study by Scanning Tunneling Microscopy and atomistic simulations of the emission of dissociated dislocation loops by nanoindentation on a (001) fcc surface. The latter consist of two stacking-fault ribbons bounded by Shockley partials and a stair-rod dislocation. These dissociated loops, which in…
Irradiation of the N−D stretching band in crystalline deuterium-doped ammonium copper Tutton salt rotates the ammonium ion and changes the conformation of molecules about the copper. The crystal salt exists in at least two different crystal forms, each form containing a particular Jahn−Teller distorted copper conforma…
Pressure swing NOx adsorption-desorption cycles were performed in the temperature range 200-350 degrees C using a fixed adsorbent bed of compressed Na-Y pellets and using a honeycomb coated with Na-Y powder. The experiments were performed using a synthetic gas mixture mimicking exhaust from a lean burn internal combus…