Materials Literature
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Liquids can be supercooled below their melting temperature <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mi>T</mml:mi> <mml:mi>m</mml:mi> </mml:msub> </mml:math> or pressurized above their melting pressure <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="…
The binary mixtures of Di-heptyloxyazoxybenzene (HOAB) and Cholesteryl Benzoate (ChB) show the longest ever temperature range of TGBA and TGBC* phases for ChB concentration 25 and 18 mole percent respectively. Comprehensive dielectric studies of these two binary mixtures have been carried out in the frequency range of…
Crystals of lanthanide ethylenediamine diphos phates Ln 2 (NH 2 (CH 2 ) 2 NH 2 )(HP 2 O 7 ) 2 · 4 H 2 O ( Ln = Eu (1) , Tb (2) , Er (2) ) have been synthesized and investigated by single crystal X-ray diffractometry (Eu and Tb phases) and by powder X-ray diffractometry (Er phase). The three structures resulted to be i…
In this work, we investigate the effects of disorder in the doped carbon nanotubes. Based on the extended Su-Schrieffer-Heeger model, it is shown that with the increase of doped impurity atoms, such as nitrogen or boron, the symmetry of the hopping processes among the doped and carbon lattices collapses, and the stati…
Photoresist stripping processes based on hydrogen reductive chemistry have emerged as attractive replacements of the conventional treatments performed using O2 plasma. H2 discharges and plasma processes based on gas mixtures containing H2 provide, in fact, adequate stripping rates while reducing the chemical modificat…
DSC method has been used to establish a solid state polymorphism of four dimethyl butanols having CH3 side groups: 2,2-dimethyl-1-butanol [CH3CH2C(CH3)2CH2OH)], 3,3-dimethyl-1-butanol [(CH3)3CCH2CH2OH], 3,3-dimethyl-2-butanol [(CH3)3CCH(OH)CH3] and 2,3-dimethyl-2-butanol [(CH3)2CHCOH(CH3)2]. Three isomers appear to be…
(111)-oriented Zn 3 N 2 thin films were grown on a -plane (1120) sapphire substrates by plasma-assisted molecular beam epitaxy. Zn 3 N 2 /sapphire exhibits orientational relationships of out-of-plane <111>∥[1120] and in-plane almost <110>∥[0001] and <101>∥[0001]. These specific orientations result from similar surface…
The cause underlying the onset of stenosis after vascular reconstruction is not well understood. In the present study, we evaluated the effect of mechanical unloading on the differentiation state of human vascular smooth muscle cells (hVSMCs) using a tissue-engineered vascular media (TEVM). hVSMCs cultured in a mechan…
Aerosol deposition (AD) is applicable as a fabrication technology for microstructures comprising different materials. We used this method for electronic devices that consist of ceramic films and metal electrodes. Various ceramic thick films (5–50 μm thickness), for example, Al 2 O 3 , 2MgO·SiO 2 , and BaTiO 3 , were d…
Various systems of permanent magnets with a large magnetic anisotropy, in which strong stray magnetic fields are generated, have been calculated. A classification of the magnet systems and corresponding strong fields into linear and point systems is suggested. It is shown that the greatest linear field can be obtained…
Laboratory radial in- and out-diffusion experiments were performed to investigate the reversibility of the iodide (I - ) uptake by argillaceous rocks from the Tournemire site (France). At first, the suitability of the method was demonstrated by means of deuterium depleted water (DDW) diffusion experiments. The values…
Electron diffraction and high-resolution electron microscopy of LaMnO 3- δ (0 ≤ δ ≤ 0.25), obtained by topotactic reduction of LaMnO 3, shows that an ordered pathway of anionic vacancies is only obtained for δ = 0.25. La 4 Mn 4 O 11 is an eightfold superlattice of the perovskite-type structure due to the ordered inter…
Abstract Fracture-mechanics experiments were carried out on ultrafine-grained (UFG) samples of copper, titanium and an Al alloy to obtain the fracture behaviour under static and cyclic loading. The UFG-materials investigated show crack resistance behaviour under static loading, which was confirmed by ductile fracture…
A Commentary on the paper ”Homologous series of liquid‐crystalline metal free and copper octa‐n‐alkoxyphthalocyanines„, by J. F. van der Pol, E. Neeleman, J. W. Zwikker, R. J. M. Nolte, W. Drenth, J. Aerts, R. Visser and S. J. Picken. First published in Liquid Crystals, 6, 577‐592 (1989).
Differential scanning calorimetry (DSC) and thermogravimetric analysis (TG) were performed on wood samples of different essences (fir, chestnut, poplar, linden and oak) before consolidation. A kinetic analysis was applied on the two-steps decomposition processes occurring in all wood samples using either the multiheat…
Carbon nanotube (CNT)/elastomer nanocomposites (CECs) are flexible and easy to fabricate accordng to the required size and form. We succeeded in realizing a uniform dispersion of CNTs in the elastomer matrices of natural rubber (NR). Intense electron emission from the CEC sheets has been confirmed; the threshold elect…
Emission dynamics of the organic semiconductor material thiophene/phenylene co-oligomer (TPCO) single crystals has been studied under high-density optical excitation at 5 K. The optical amplification phenomenon is observed both on 0–1 and 0–2 vibration transitions, where these intensities increase superlinearly with t…
Two types of optical recording crystalline material Ge 2 Sb 2 Te 5 have been studied by neutron and X-ray powder diffraction measurements. One is the crystalline cubic-phase Ge 2 Sb 2 Te 5 . The other is nanocrystalline-phase Ge 2 Sb 2 Te 5 . In the former, a large atomic displacement of germanium atoms was found by t…
Exfoliation corrosion (EFC) of AA7178 (UNS A97178) has been quantitatively studied using the exfoliation of slices in humidity (ESH) test, which measures exfoliation layer thickness of the specimens as a function of time in a humid environment after an electrochemical pretreatment. The effects of relative humidity (RH…
High-pressure phase stabilities of the CaSnO 3 system were investigated using density functional theory static lattice energy calculations. We have identified six phase changes in this system: perovskitepost-perovskite, post-perovskite-B2+cotunnite in CaSiO 3 , B1-B2 in CaO, cassiterite-pyrite, pyriteorthorhombic-I, a…