Materials Literature
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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…
The viscosity of potassium chloride in a mixture of poly(vinyl alcohol) and water (1.0 g·L -1 to 5.0 g·L -1 ) was measured at different concentrations of the solute (1.0 × 10 -2 to 9.0 × 10 -2 ) mol·dm -3 at various temperatures ranging from 303 K to 323 K at intervals of 5 K. Ionic interactions in terms of Jones−Dole…
Although the papers in this volume indicate the variety of areas in which conducting polymers have been utilized, the growth of the field in the period since has benefitted from a growing interest in their application, especially for sensing, anticorrosion and investigation of biologically important processes.This int…
Surface migration is the basis of the solid state preparation of various materials. In the case of heterogeneous catalysts, it involves the spreading of metal oxides with low Tammann temperature, such as MoO3, on various refractory supports like γ-Al2O3 and zeolites. In spite of its importance, the speciation of oxide…
Charge-induced dimensional changes allow conducting polymers and single walled carbon nanotubes to function as electromechanical actuators. The unit cell of the prototypical conducting polymer, trans-polyacetylene, was calculated as a function of charge injection using density functional theory in combination with ult…
A fully explicit three-dimensional lattice density functional theory is used to investigate adsorption behavior in collections of noninterconnected pores. The study focuses on the effects of external surfaces and the shape of individual pores on the adsorption and desorption isotherms. Pore shapes far more varied than…
The features of the incommensurate phase in $\mathrm{Pb}({\mathrm{Zr}}_{1\ensuremath{-}x}{\mathrm{Ti}}_{x}){\mathrm{O}}_{3},$ which has a simple perovskite structure, have been investigated in the whole incommensurate region of the phase diagram by transmission electron microscopy. The incommensurate phase basically e…