Materials Literature
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The friction between the walls of multi-wall carbon nanotubes is shown to be extremely low in general, with important details related to the specific choice of the walls. This is governed by a simple expression revealing that the phenomenon is a profound consequence of the specific symmetry breaking: super-slippery sl…
We report observation of substantial thermal relaxation in single crystal of charge ordered system Pr$_{0.63}$Ca$_{0.37}$MnO$_3$ in an applied magnetic field of H = 8T. The relaxation is observed when the temperature is scanned in presence of a magnetic field in the temperature interval $T_{MH}
The paper discusses local porosity theory and its relation with other geometric characterization methods for porous media such as correlation functions and contact distributions. Special emphasis is placed on the charcterization of geometric observables through Hadwigers theorem in stochastic geometry. The four basic…
There is widespread interest in the search for materials that would allow the fabrication of more efficient thermoelectric devices for cooling and power generation applications. Here, we report a large increase in the thermoelectric power of p-doped antimony bismuth telluride alloys upon pressure tuning under nonhydro…
Studies of solid-state structures under different crystallization conditions, melting behavior, and crystal growth kinetics are reported for biodegradable aliphatic poly(butylene succinate) (PBS) and its random copolyesters of poly(butylene succinate-co-14 mol %ethylene succinate) [P(BS-co-14 mol %ES)] and poly(butyle…
The design of artificial models of the processes of biomineralization has resulted in the union of inorganic materials research and supramolecular organic chemistry. Recent work in this field of bioinspired synthesis of composite organic/inorganic materials is reviewed and prospects for the future are discussed. Atten…
A two-sublattice peudospin model with distance-dependent interaction parameters is constructed for the ferroelectric phase transition at 307 K and for the isomorphous anomaly at 180 K in pentakis (methylammonium) undecachlorodibismuthate (III) $({\mathrm{CH}}_{3}{\mathrm{NH}}_{3}{)}_{5}{\mathrm{Bi}}_{2}{\mathrm{Cl}}_{…
Two series of trends in negative pressure with cavitation in water were observed by the Berthelot method using single- and poly-crystalline molybdenum tubes sealed with single-crystalline copper plugs by repeating runs of temperature cycles at rates of 70-100 cycles/day between 50 and 98 °C, where a run means successi…
Using X-ray data, the determination of the cation distribution in crystals becomes problematic as a result of parameter correlations in the structure refinements. To circumvent the problem, a new refinement strategy (LOT analysis) was proposed by Kroll et al. [ Eur. J. Mineral. (1997), pp. 705–734] and successfully ap…
The first off-resonance hyperpolarizabilities (β(0)) of bisubstituted carotenoids are computed and analyzed using a quasiparticle, collective electronic oscillators (CEO) representation. The few oscillators which dominate the response are identified by solving the time dependent Hartree−Fock equations for the reduced…
The crystal structure of hexagonal ErMnO3, erbium manganese trioxide, has been determined at room temperature. It is isomorphous with YMnO3. Although we observed inversion twinning, similar to YMnO3, the twin fractions do not have a 1:1 ratio, and the crystals are expected to show net ferroelectricity.
Abstract The heat capacity of poly[carbonyl(ethylene‐ co ‐propylene)] with 95 mol % C 2 H 4 CO (Carilon EP®) was measured with standard differential scanning calorimetry (DSC) and temperature‐modulated DSC (TMDSC). The integral functions of enthalpy, entropy, and free enthalpy were derived. With quasi‐isothermal TMD…
We report extensive simulations of liquid supercooled states for a simple three-site molecular model, introduced by Lewis and Wahnström [Phys. Rev. E 50, 3865 (1994)] to mimic the behavior of orthoterphenyl. The large system size and the long simulation length allow us to calculate very precisely (in a large q-vector…
Ultrafine ${\mathrm{Pt}}_{x}{\mathrm{Ru}}_{1\ensuremath{-}x}$ particles (with $0<~x<~1),$ synthesized by decomposition of organometallic precursors in the presence of a stabilizing polymer, are studied using both high-resolution transmission electron microscopy and wide-angle x-ray scattering techniques. In this…
The molecular motions in d -sorbitol ( d -glucitol) have been studied by thermally stimulated depolarization currents (TSDC) in the temperature region between −160 and 10 °C. The β relaxation appears as a broad global peak between −160 and −50 °C and its features were compared with those of the β relaxation of maltito…
A fluid mixture of hard discs is made glassy in a molecular dynamics experiment by permanently constraining each disc center to stay within a cage of three near neighbors. The constraints can be applied at any density and they cause a thermodynamic glass transition where the compressibility, heat capacity, and entropy…
Abstract The miscibility, crystallization, vitrification, and melting behavior of multiblock copolymers consisting of alternating components of oligo[imino(1‐oxododecamethylene)] and oligo(oxytetramethylene) were investigated in their dependence of composition and molecular mass of the blocks. In all compositions stud…
From temperature studies at ambient pressure, it was pointed out for several glass-forming liquids that the alpha-relaxation time (tau) can be related to the dc-ionic conductivity (sigma) through the phenomenological fractional Debye-Stokes-Einstein (DSE) equation. In the present paper we test the validity of fraction…
Hydrogenated diamond-like carbon (DLC) films have been deposited on silicon substrates from dielectric barrier discharge (DBD) plasmas of CH 4 at room temperature under a pressure of 0.4-4.0 Torr. The effects of discharge gas pressure ( P ), the applied peak voltage and the distance of the discharge gas spacing ( d )…
A study of the electrical conductivity of polypyrrole-polyoxyphenylene composites (PPy-POP and PPy-POP-MPcTS) prepared by in situ electropolymerization is presented, where MPcTS stands for tetrasulfonated tetrasodium metallophthalocyanine salts and is used as a second dopand for polypyrrole. The conductivity is studie…