Materials Literature
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Samples of semicrystalline polyethylene in which the chain topology within the amorphous component was altered by using two-stage processing, including crystallization in a chain-extended fashion at high pressure in the first step, were produced, and their deformation behavior in the plane-strain compression was studi…
Poly(styrene- block- methyl methacrylate) thin films with cylindrical microdomains oriented normal to the surface were used as templates for nanoscopic silica structures. Silicon oxide was synthesized using vapor-phase and liquid-phase sol−gel reactions of tetraethoxysilane (TEOS). The vapor-phase reaction selectively…
An efficient strategy for synthesis of a wide range of homo- and heterometallic polynuclear complexes is proposed. The synthesis protocol consists of a two-step one-pot reaction. The first step is the in situ generation of carboxylate anions via oxidation of aromatic aldehydes by metal nitrates in air. The aldehydes a…
We present an extensive first-principles study of the pressure dependence of the formation enthalpies of all the know vacancy and self-interstitial configurations in silicon, in each charge state from -2 through +2. The neutral vacancy is found to have a formation volume that varies markedly with pressure, leading to…
A new volume on soft materials ranges broadly across systems and techniques, experiment, and theory. Despite a lack of coherence, there is much of interest, which conveys the energy within soft-matter science, says
The isothermal time dependences of the dielectric constant and the discharging current of barium stannate titanate ceramics after application or removal of a step field were investigated in both ferroelectric and paraelectric temperature regions. The experimental results exhibited a substantial difference for these tw…
This paper reports the results of a one-stage pyrolysis of liquid crystal wastes using thermal gravimetric analysis to characterize their treatment potentials. Liquid crystal can be decomposed at 413–596 K. The kinetic parameters for the liquid crystal pyrolysis were obtained from the TGA experiments which were based…
The results of crystal structure, bulk magnetic properties and magnetic structure investigations are reported for the intercalated compound Cr 0.5 TiSe 2 . The Cr atoms are found to be ordered in the hexagonal TiSe 2 matrix forming a superlattice , b = a ', c = 2 c '. The first neutron diffraction measurements perform…
Abstract Compounds of electron‐beam‐irradiated polytetrafluoroethylene (PTFE) and polyamide (PA) were produced by reactive extrusion. During extrusion, both a breakdown process of the PTFE agglomerates and a chemical reaction between PTFE and PA took place. The morphology of the compounds was characterized with differ…
Abstract The formation of block copolymers as a result of an in situ chemical reaction during the reactive extrusion of electron‐beam‐irradiated polytetrafluoroethylene (PTFE) and polyamide 6 (PA) was detected indirectly with differential scanning calorimetry and Fourier transform infrared. As expected, the content of…
Nematic ordering is studied in solutions of rodlike macroions in the presence of monovalent salt ions. The correlation free energy of electrostatic interactions is calculated within the framework of the Debye-Hückel approach. The phase diagram of the system is obtained. We have shown that the addition of salt destroys…
A new route for the highly convenient scalable production of carbon nanofibers on a sodium chloride support has been developed. Since the support is nontoxic and soluble in water, it can be easily removed without damage to the nanofibers and the environment. Nanofiber yields of up to 6500 wt % relative to the nickel c…
Circularly polarized optical poling was proposed and discovered for GaN nanocrystallites embedded in a silica xerogel matrix. The method consists of the creation of screw-like polarization of the medium during the interaction of two circularly polarized coherent bicolour beams. It was shown that doping of the GaN nano…
A series of martensitic Ni 52 Mn 24 Ga 24 thin films deposited on alumina ceramic substrates has been prepared by using RF (radio-frequency) magnetron sputtering. The film thickness, d , varies from 0.1 to 5.0 µm. Magnetic domain patterns have been imaged by the MFM (magnetic force microscopy) technique. A maze domain…
We study the dynamics of soft colloids interacting via a Gaussian pair potential in an external moving potential which is periodic in the spatial coordinate of the direction of motion. Both dynamical density functional theory and Brownian dynamics computer simulations are used to predict the steady-state density profi…
This work provides values of electron scattering 002 structure factors for ${\mathrm{In}}_{x}{\mathrm{Ga}}_{1\ensuremath{-}x}\mathrm{As}$ as a function of the In concentration $x=0$ to 1. These results allow accurate compositional analysis of pseudomorphically grown ${\mathrm{In}}_{x}{\mathrm{Ga}}_{1\ensuremath{-}x}\m…
Live imaging of operating multiwall carbon nanotube (MWCNT-) based electronic devices is performed by high resolution transmission electron microscopy. Our measurements allow us to correlate electronic transport with changes in device structure. Surface contamination, contact annealing, and sequential wall removal are…
Abstract The aim of this study was to investigate the structure and morphology of polyurethane (PU) foams at the interface with a thermoplastic material. Fourier transform infrared/attenuated total reflectance spectroscopy was used to study the reaction of 4,4′‐diphenylmethane diisocyanate (MDI) with polyether‐based p…
Abstract This work encompasses the development of low‐viscosity cyclic oligomer underfill formulations that cure without heat evolution. Boron nitride, silica‐coated aluminum nitride, and alumina ceramic powders were used as fillers in cyclic butylene terephthalate oligomer melts. The melts were heated with a suitable…
RbGaS2, for which only cell parameters were previously known, consists of GaS2 layers interleaved with Rb atoms.