Materials Literature
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Theoretical calculations have been performed and applied to determine the most likely geometry for the pyrosulfate ion. The main question was to determine as to whether the system has C 2 or C 2 v conformation. The present study favors C 2 symmetry. Bond lengths and angles have been calculated for the isolated ion, an…
Silicon oxide (SiO x ) and silicon nitride (Si x N y ) thin films of different thicknesses were deposited on the polyimide (PI, Kapton HN) film surfaces via plasma-enhanced chemical vapor deposition (PECVD). The silica films were prepared from two types of gaseous mixtures, including (1) tetraethyl orthosilicate (Teos…
We have suggested an atomic layer deposition (ALD) method for preparing W–N films on Si and non-Si surfaces by using WF6 and NH3. It is very difficult to deposit W–N films with sequential exposures of WF6 and NH3 because WF6 either reacts with Si quickly due to the catalytic reaction of Si, forming a thick W layer ins…
Abstract Raman spectroscopy was applied to monitor the growth of diamond in different plasma‐assisted chemical vapour deposition reactors. A gated, multichannel detection system was used to discriminate against the high level of background radiation produced by the plasma and the hot substrate. As a result, Raman spec…
Abstract The interaction between collagen and organometallic aluminum complexes was studied. From the analysis of the IR and UV spectra, the viscosity of collagen, and the treated collagen, a possible interaction model of the collagen with the aluminum tanning agent has been found. It indicates that such an aluminum t…
We propose using ion-beam etching as an additional tool for the accurate control of the thickness of thin films during the manufacture of sensitive optical multilayer coatings. We use a dual ion-beam sputtering system in the deposition and etch modes. In the deposition mode both the assist and sputtering ion beams are…
Polymorphism in barium gallate BaGa2O4 was studied using electron diffraction and high resolution electron microscopy. Three modifications of BaGa2O4 with structures closely related to the high-temperature α-form were observed. The phase transitions from γ-BaGa2O4 (a γ = 18.6143(2) Å = 2<formula><radical><radicand>3</…
In this work we have explored the possibilities to create layered organizations of the Mn 12 single-molecule magnets using the Langmuir–Blodgett technique or attaching these clusters onto a metal surface by preparing self-assembled monolayers (SAMs). In the first part we discuss the use of the Langmuir–Blodgett (LB) t…
Abstract A novel tert ‐butyl‐containing dianhydride was prepared from readily available reagents. It was reacted with various aromatic diamines to prepare a set of polyimides containing tert ‐butyl pendent groups. The resulting polyimides exhibit high molecular weights (high inherent viscosity), and a combination of d…
Abstract Raman spectroscopy is a powerful tool for the study of solids under extreme conditions of pressure and temperature. This technique can be used to determine phase diagrams and study phase transition mechanisms. Raman spectroscopy can be used to characterize disorder present in crystalline solids and is sensiti…
β-4-(N-Tert-butyl-N-aminoxyl)-1,1‘-biphenyl-3‘,5‘-dicarboxylic acid forms stacked, intercalated, 1-D hydrogen-bonded chains whose nitroxide groups interact with m-phenylene C−H bonds of neighboring radicals, yielding chains of NO···HC close contacts perpendicular to the hydrogen-bonded chains. The latter chain appears…
The dynamics of magnetoelectric RMn 2 O 5 crystals (R=Eu and Gd) was studied in the frequency and temperature ranges 20–300 GHz and 5–50 K, respectively. The crystals possessed magnetic and ferroelectric long-range order and had close transition temperatures, T N, C ≃36 and 30 K for R=Eu and Gd, respectively. Mixed ma…
In this paper a modified version of the RSTRENG 085dL method is proposed. This method, named RPA method or Modified 085dL method, uses two different equations to predict the failure pressure of a corrosion defect: one for short defects (defects in which L { {radical}20 D{sub e} t). The equation for short defects is th…
The possibility of curling hair is attributed to the fact that the mechanical properties of hair fibres depend on time, temperature and humidity. In this study the dependence of the viscoelastic behaviour of human hair fibres on humidity is characterised in a bending deformation. An experimental set-up was used to per…
A poliamida 6 (PA6) é um polímero semicristalino de grande aplicação na engenharia e que apresenta instabilidade no processamento e baixa resistência ao impacto sob entalhe. A incorporação do ABS (acrilonitrila-butadieno-estireno) como modificador de impacto da PA6, pode melhorar estas propriedades. Entretanto, como e…
Abstract In this contribution, we report the design and theoretical analysis, using the INDO/SCI‐SOS quantum chemical formalism, of novel molecular architectures based on planar [N 4 ]‐, (2‐aminobenzylideneiminato)‐ and tetraazamacrocycle‐coordinated nickel( II ) complexes, having second‐order nonlinear optical (NLO)…
Two series of mesogenic compounds having both a perfluorinated substituent and a hydrogen bonding active site were synthesized and their phase behavior investigated. Due to the chemical architecture of these materials exhibiting amphiphilic character, structures of nano-segregation are expected to form. We found a the…
New experimental data illustrating the effect of deep traps on the luminescence properties of anion-defective α-Al 2 O 3 single crystals are presented. It was established that deep traps have electronic nature and their filling occurs through photoionization of F centers and is accompanied by F → F + -center conversio…
Article Kinetic Study of the Bulk Reaction Between TDI and PPG in Prescence of DBTDL and FEAA Catalysts Using Quantitative FTIR Spectroscopy was published on July 1, 2003 in the journal Journal of Polymer Engineering (volume 23, issue 4).
The dry salt layer pollution test method is introduced as a better alternative to the present standardized insulator test method for coastal environments. Comparative tests were performed on an 800 kV composite housed SF/sub 6/ filled bushing, using the salt-fog and dry-salt-layer test methods. The two test methods ar…