Materials Literature
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Silicon nanoparticles dispersed in 2-propanol were prepared by using an arc plasma with gas flow method in a new designed home-made apparatus. The particles are composed of silicon crystal core covered by oxidized amorphous silicon shell. The composition of the particle surface layer can be modified by preparing the s…
Abstract Two different types of polymer hybrids having an interpenetrating polymer network (IPN) of the organic gel and silica gel were prepared by the in-situ polymerization method. One type is the IPN polymer hybrids of poly(N,N′-dimethylacrylamide) gel and silica gel that were prepared by simultaneous polymerizatio…
A two-body interatomic potential function, including fractional atomic charges and a shell model for oxygen, and supplemented by an O—Al—O bond-angle energy term, was fitted to the structural, elastic and vibrational properties of \alpha-Al 2 O 3 , corundum, at ambient conditions. Full quasi-harmonic calculations were…
By the combined use of DSC, WAXD and pycnometry techniques, it was demonstrated that the increase in free volume and reduction in Tg observed in semi-crystalline poly(carbonate of bisphenol A) (PC), whose crystallization was solvent-induced, are due to the creation of many microvoids, microcavities and crazes in the a…
The Barkhausen noise amplitude was measured under conditions of biaxial stress in steel pipe for the case of a magnetic field noncoaxial with the stress axes. The stress axes for stresses σ1 and σ2 were orthogonal to each other. In particular, σ1 was the axial stress and σ2 was the hoop stress. Various angles were use…
The surfaces of Ar plasma-pretreated polytetrafluoroethylene (PTFE) films are further functionalized via UV-induced graft copolymerization with amphoteric N,N′-dimethyl(methacryloylethyl)ammonium propansulfonate (DMAPS) either in Ar atmosphere, or under atmospheric conditions and in the absence of a polymerization ini…
Using the Lanczos method in linear chains we study the ground state of the double exchange model including an antiferromagnetic superexchange in the low concentration limit. We find that this ground state is always inhomogeneous, containing ferromagnetic polarons. The extension of the polaron spin distortion, the disp…
V 2 O 3 powder and film were prepared by the reduction of sol–gel-synthesized V 2 O 5 . The V 2 O 3 single phase was synthesized by reduction above 500°C for 2 h in hydrogen atmosphere. X-ray diffraction measurements revealed that the films were distorted by the substrate and that the antiferromagnetic insulator-metal…
The smectite to illite transformation in early Miocene sediments was studied in wells and outcrops in the western Pannonian Basin, where magmatic activity caused very high Miocene heat flows (250-400 mW/m 2 ). Although the thermal history is similar, large differences in smectite to illite diagenesis were observed. (1…
The theoretical energy requirement (TER) for the fusion of batch samples of flat and container glasses was determined by using the drop‐mixing method. The TER values obtained from this study have been compared to values derived from other models; a deviation of up to 8% was observed. This comparison suggested no signi…
Three photochromic monomers containing a permanent dipole photochromic azobenzene group separated from the methacryloyl moiety by a polymethylene spacer, namely 4-(4-oxy-4′-cyanoazobenzene)but-1-yl methacrylate, 6-(4-oxy-4′-cyanoazobenzene)hex-1-yl methacrylate, and 8-(4-oxy-4′-cyanoazobenzene)oct-1-yl methacrylate, w…
In peroxide crosslinked low density polyethylene for wire and cable applications there is a critical balance between the additives. Normally dicumyl peroxide is applied as the crosslinking agent and stabilizers are needed towards thermo-oxidative degradation as described by existing specifications. In addition, the ph…
Electron crystallography offers an increasingly viable alternative to X-ray crystallography for structure determination, especially for membrane proteins. The methodology has been developed and successfully applied to 2D crystals; however, well-ordered thin, 3D crystals are often produced during crystallization trials…
Additions of 1‐20 mol% Sc 2 O 3 or Y 2 O 3 to MoSi 2 eliminate glassy SiO 2 , which improves mechanical properties at both ambient and high temperatures. In particular, only 1 mol% ScO 3 additions dramatically enhance three‐point bending strength from 521 to 1081 MPa. Vickers hardness, Young's modulus, fracture toughn…
It is demonstrated that anodization of heavily doped n-type silicon in the dark is available for producing periodic silicon nanostructures. The relationship between the porous silicon (PS) morphology and the anodization parameters have been investigated in detail using high resolution scanning microscopy. Analyses of…
In this paper we review and discuss the possibility of having a 2D-nematic ordering of the surfactant polar heads in bilayer membranes. The coupling between the nematic order parameters and the curvature can yield instabilities in the shape of the membrane, generally leading to tubules with mesoscopic radiuses. The ne…
The morphological evolution of lithographically defined cracklike flaws in glass and glass‐containing ceramics was studied at elevated temperatures. The systems studied have glass contents from 100 to approximately 0.5 vol%, providing insight to the contribution of viscous flow of the glass to crack healing over a ran…
Abstract The point defect structure of a doped (oxide) system was quantitatively studied by applying in situ X‐ray absorption spectroscopy in the vicinity of the absorption edge of the dopant at high temperature ( T >270 K) and under defined oxygen activity. Based on refined phase diagrams of second kind (oxygen ac…
Striation-like hydrogen embrittlement (SHE) fracture occurs at low hydrogen concentration for an iron single crystal with a small carbon content, while cleavage fracture occurs at higher hydrogen concentration. The cleavage fracture initiated owing to hydrogen accumulated in front of the SHE crack tip propagates extre…
Discs of poly(aniline)-silver-polymer electrolyte particulate composites exhibit rapid and reversible changes in their microwave impedance when small electric fields are applied across them in a coaxial line test set in a resonant condition. The effect of composition on the cyclic voltammetry and microwave characteris…