Materials Literature
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The promotional effect of Cr addition on the methane aromatization performance of the Mo/HZSM-5 catalyst was investigated. It was found that much higher methane conversion was obtained over Mo–Cr/HZSM-5 catalyst than over Mo/HZSM-5. The results indicate that when the Cr/Mo molar ratio is 0.07, the methane conversion a…
NiAl 2 O 4 is known to transform from a normal spinel, (Ni 2+ )[Al 2 3+ ]O 4 , to an inverse spinel, (Al 3+ )[Ni 2+ Al 3+ ]O 4 , and vice versa. In this process, the larger Ni 2+ ions which occupy the tetrahedral (8a) sites in normal spinel move to the octahedral (16d) sites in inverse spinel while half of the smaller…
To simplify the abstraction of descriptors, for the correlation analysis of the stability constants of gadolinium(III) complexes and their ligand structures, aiming at gadolinium(III) complexes, we only considered the ligands and ignored the common parts of the structures, i.e., the metal ions. Quantum-chemical descri…
Photoisomerization of a chiral azobenzene dopant possessing only one asymmetric carbon, (R)-3-(1-methylhexyloxy)-3′-octyloxy-2,2′-dimethylazobenzene, was found to be able to specifically induce a helical twist inversion in liquid crystals having alkenyl terminal substituents, an alkenyl-selective interaction which was…
We prove that point defect clustering in perovskite ferroelectrics and the subsequent loss in switchable polarization can occur only if the depolarizing fields are locally unscreened during certain fractions of time in each of the multiple bipolar electric field cycles.
A chiral, 3-substituted polythiophene with an amino-acid function shows pH-dependent visible, emission and circular dichroism spectra in buffered aqueous solution. At pH equal to the p I of the amino-acid, the backbone adopts a nonplanar right-handed helical conformation and the polymer chains are separated from each…
The ability of living systems to form many different minerals has attracted the attention of biologists and materials scientists alike for decades. But the field is still good for surprises. In their Perspective, Weiner and Addadi highlight the report by Lichteneggeret al., who show that the teeth of the marine bloodw…
The nearest-neighbor coordination environments of Ge and As atoms in ${\mathrm{Ge}}_{x}{\mathrm{As}}_{y}{\mathrm{Se}}_{1\ensuremath{-}x\ensuremath{-}y}$ glasses with $x:y=1:2$ and 1:1 and in ${\mathrm{Ge}}_{0.154}{\mathrm{As}}_{0.308}$ $(\mathrm{S},\mathrm{S}\mathrm{e}{)}_{0.538}$ sulfoselenide glasses with wide-rangi…
The synthesis and characterization of novel complementary multiple hydrogen-bonded poly(styrene) (CMHB-PS) oligomers possessing controlled molecular weights and narrow molecular distributions are described. Novel CMHB-PS oligomers comprising terminal heterocyclic base units were synthesized in a controlled fashion via…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTStabilization of Dispersed Phase to Static Coarsening: Polymer Blend Compatibilization via Solid-State Shear PulverizationAndrew H. Lebovitz, Klementina Khait, and John M. TorkelsonView Author Information Department of Chemical Engi…
In this paper, we propose a variational formulation to study the singular evolution equations that govern the dynamics of surface modulations on crystals below the roughening temperature. The basic idea of the formulation is to expand the surface shape in terms of a complete set of basis functions and to use a variati…
Intentionally-produced inversion domain boundaries in GaN have been reported to be highly efficient recombination centers. Here I report a rationale for this phenomenon based on ab initio density-functional calculations. I also propose a model, based on the existence of polarization in GaN, of the observation that a d…
We investigate the dynamics of two interacting electrons in coupled quantum dots driven by an AC field. We find that the two electrons can be trapped in one of the dots by the AC field, in spite of the strong Coulomb repulsion. In particular, we find that the interaction may enhance the localization effect. We also de…
An extensive literature review, covering environmental corrosion of mild steel and low alloy steels, pitting, interand transcryst. stress corrosion cracking of stainless steels and austenitic Mn steels, and corrosion at high temp. A short section on corrosion prevention is included. The discussion gives a comprehensiv…
Biominerals are widely exploited to harden or stiffen tissues in living organisms, with calcium-, silicon-, and iron-based minerals being most common. In notable contrast, the jaws of the marine bloodworm Glycera dibranchiata contain the copper-based biomineral atacamite [Cu2(OH)3Cl]. Polycrystalline fibers are orient…
Bimetallic nanoparticles (Ru(6)Pd(6), Ru(6)Sn, Ru(10)Pt(2), Ru(5)Pt, Ru(12)Cu(4), and Ru(12)Ag(4)) anchored within silica nanopores exhibit high activities and frequently high selectivities, depending upon the composition of the nanocatalyst, in a number of single-step (and often solvent-free) hydrogenations at low te…
The local segmental dynamics of melt anthracene-labeled cis-1,4-polyisoprene have been studied as a function of temperature (318–333 K) and pressure (0.1–140 MPa). Activation volumes for the motions range from 24 to 39 cm3 mol−1 and are observed to be temperature dependent, decreasing with increasing temperature. Acti…
Based on experimental observations and theoretical explanation of the streamer spatial extension for an inhomogeneous field gap in SF 6 , a new model is developed, taking into account the probability of the appearance of an efficient electron. The model, which can help one to better understand the breakdown characteri…
Carbon encapsulated magnetic cobalt nanoparticles have been synthesized by the modified arc-discharge method. Both high resolution transmission electron microscopy (HREM) and powder X-ray diffraction (XRD) profiles reveal the presence of 8–15 nm diameter crystallites coated with 1–3 carbon layers. In particular, HREM…
The preparation of binuclear mesogenic copper(I) isocyanide complexes [CuX(CNR)(2)](2) (X = halogen; R = C(6)H(4)C(6)H(4)OC(10)H(21) (L(A)), C(6)H(4)COOC(6)H(4)OC(n)H(2n+1)((L(B)), C(6)H(2)(3,4,5-OC(n)H(2n+1))(3) (L(C))) with an unusual tetrahedral core is described. The copper complexes with L(A) are not liquid cryst…