Materials Literature
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Lateral inhomogeneities of grain boundaries caused by partially wetting grain‐boundary phases or pores induced in the grain boundary give rise to current‐constriction resistances close to grain‐to‐grain contacts. The present work presents a quantitative three‐dimensional analysis of the resulting grain‐boundary impeda…
A new synthetic approach to generate mesostructured phosphorus-free titania is reported. Mesostructured hexagonal and lamellar titania were prepared by using the cationic surfactant C 16 TMA + and soluble peroxytitanates in the presence of Na + and TMA +, respectively. Moreover, upon hydrothermal postsynthesis, the la…
High-field and -frequency electron paramagnetic resonance (HFEPR) spectroscopy has been used to study two complexes of high-spin manganese(III), d(4), S = 2. The complexes studied were (tetraphenylporphyrinato)manganese(III) chloride and (phthalocyanato)manganese(III) chloride. Our previous HFEPR study (Goldberg, D. P…
The structural characteristics of spinel (from both theoretical and experimental viewpoints) that are advantageous for producing transparent conducting oxide (TCO) materials are considered. A working hypothesis is presented for finding new TCO materials with spinel structure. Results of tight‐binding energy‐band calcu…
Three cholesterol-based gelators were synthesized which have a monobenzo-18-crown-6 ( 2 ), monoaza-18-crown-6 ( 3 ), and 1,10-diaza-18-crown-6 ( 4 ), respectively. These gelators could gelatinize 8 of 14 organic solvents tested herein, indicating that they possess a versatile gelation ability. Scanning electron micros…
All-ceramic crowns based on Zirconia-TZP-frameworks should have advantages in comparison to copings of Alumina (PROCERA-AllCeram) because of their mechanical properties. Zirconia-TZP-frameworks were manufactured after optical digitising using a modified Precident-DCS-System. The mean fracture strength and the vertical…
This paper surveys the properties which give silicone rubber its distinctive and highly desirable performance characteristics for use as outdoor insulation. The methods of assessing these properties arediscussed and this is followed byadetailedsurveyof whatis knownof agingaud recovery mechanisms. Corona is identified…
A new method for the fabrication of ordered arrays of small particles is reported here. A combination of microcontact printing of SAMs, surface-templated self-assembly, and confined crystallization has been used to produce 2D arrays of micro- and nanoparticles. The method allows highly accurate control over size distr…
Originally coming from aerospace technology, fibre reinforced plastics (FRP) are successfully used for various applications because of their excellent specific properties, e. g. high strength and stiffness, low weight and the potential of optimisation by orientating (esp. continuous) fibres along the load paths. In or…
Most of the silicone materials used for Hv outdoor insulation are high-consistency, heat cured polydimethylsiloxane (PDMS) elastomers. The unique properties of PDMS that make it suitable for HV applications are reviewed. The surface of these elastomers can be rendered hydrophilic by exposure to discharges. A time and…
We report the observation of a peculiar conductive phase with ferromagnetic interactions and a Curie-Weiss paramagnetism above the cooperative Jahn-Teller orbital-ordering temperature ${T}_{\mathrm{JT}}$ in a single crystal of the single-valent compound ${\mathrm{LaMnO}}_{3}.$ A positive Weiss constant increases disco…
The adsorption of molecular hydrogen gas onto charged single-walled carbon nanotubes (SWNTs) is studied by grand canonical Monte Carlo (GCMC) computer simulation. The quadrupole moment and induced dipole interaction of hydrogen with “realistically” charged (0.1 e/C) nanotubes leads to an increase in adsorption relativ…
We report polarization-analyzed, resonant x-ray diffraction at the sulfur K edge performed upon free-standing liquid-crystal films. Our studies of the thiobenzoate liquid-crystal enantiomer 10OTBBB1M7 yield the polarization states of resonant satellite peaks arising from characteristic superlattices in the chiral smec…
Preparative chromatography is a potential application for mesoporous silica due to its high surface area. Mesoporous spheres (MSs) have been prepared quickly from acid solution (see Figure), and their properties with regard to liquid chromatography and high-performance liquid chromatography (HPLC) explored. A new chro…
It is possible to formulate the thermodynamics of a glass forming system in terms of the properties of inherent structures, which correspond to the minima of the potential energy and build up the potential energy landscape in the high-dimensional configuration space. In this work we quantitatively apply this general a…
We study theoretically the interaction of a charged, semiflexible polymer with an oppositely charged sphere. Both the effects of added salt (leading to a finite screening length) and of a bare stiffness of the polymer are taken into account. For intermediate salt concentration and high enough sphere charge we obtain a…
Direct measurement of the conduction electron spin polarization (P) in epitaxial NiMnSb was performed to test the prediction of half metallicity in this material. Spin-polarized tunneling in NiMnSb/Al2O3/Al junctions showed P of 28%, contrary to the predicted value of 100%. Magnetoresistance measurements in NiMnSb/Al2…
This article presents our recent work in the controlled synthesis of multiwalled (MWNT) and single-walled nanotubes (SWNT) with ordered architectures. The general synthesis approach involves chemical vapor deposition using rationally designed catalyst and substrates. The results include self-oriented MWNTs, individual…
We present molecular dynamics simulations of the extended simple-point-charge model of water to probe the dynamic properties at temperatures from 350 K down to 190 K and pressures from 2.5 GPa (25 kbar) down to -300 MPa (-3 kbar). We compare our results with those obtained experimentally, both of which show a diffusiv…
We study theoretically the adsorption of semiflexible charged polymers on an oppositely charged flat substrate. We restrict ourselves to polymers with relatively high line charge density τ and bare bending stiffness 𝓁 0, such as DNA or fully charged synthetic polyelectrolytes, for which the condition τ 2 𝓁 B 𝓁 0 > 1 (…