Materials Literature
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Thin films of amorphous carbon (a-C) were synthesized on smooth silicon substrates under different conditions of low-pressure radio-frequency discharge in pure Ar atmospheres. Transmission electron microscope and atomic force microscope studies provided insight into the dependence of the film thickness and roughness o…
Methylsilsesquioxane (MSQ) based porous low-k dielectric films are characterized by x-ray porosimetry (XRP) to determine their pore size distribution, average density, wall density, and porosity. By varying the porogen content from 1% to 30% by mass, the porosity changes from 12% to 34% by volume, indicating that the…
An approach for the fabrication of hexagonally ordered arrays of cylindrical nanoholes in crystalline and amorphous silicon based on the self-organization of polymer micelles, Brieger, Sabrina, Dubbers, Oliver, Fricker, Sebastian, Manzke, Achim, Pfahler, Christian, Plettl, Alfred, Ziemann, Paul
The rate and mechanism of hydrolytic degradation and erosion determine the utility and performance of bioresorbable polymers for tissue-engineering and drug-delivery applications. Nevertheless, changes in polymer morphology at the nanoscale caused by degradation and erosion, particularly those associated with the spat…
Microstructures and damping properties have been investigated in Fe-23%Mn-(0~2)%Si and Fe-23%Mn-(0~2)%Co alloys, based on experimental results from metallography, X-ray diffractometry and vibration test in a flexural mode. The amount and number density of ε martensite are increased with an increase in Co content, resu…
We report the preparation and characterization of Si nanoislands grown on a c-Si substrate by thermal annealing of silicon-rich oxide (SRO) films deposited using a conventional low pressure chemical vapour deposition (LPCVD) technique. Transmission electron microscopy revealed that a high density of Si nanoislands was…
We have carried out a detailed investigation on the resonant tunneling in crystalline ($c$-) Si/nanocrystalline ($nc$-) Si heterostructure diodes, with the emphasis on doping concentration dependence. By the aid of the self-consistent calculation, together with a transfer matrix procedure, we are able to explain well…
The complex dielectric permittivity of the morphotropic phase boundary [001]-oriented PMN–x%PT single crystal with x=33%, grown by the modified Bridgman technique, has been investigated as a function of both temperature and dc poling field. Structural phase transformation sequence is discussed in the light of polariza…
The dark conductivity and photoconductivity of Se 80− x Te 20 Bi x (0≤ x ≤1) thin films have been studied. The values of dc activation energy, optical band gap and photoconduction activation energy are found to decrease with the addition of bismuth content. The optical energy gap has been found to be approximately equ…
Abstract A facile method of connecting fluorescent meso ‐tetrakis(4‐sulfonatophenyl)porphine tetranion nanotubes to polyelectrolyte capsules is developed. Heat‐sensitive robust polyelectrolyte capsules consisting of poly(diallyldimethylammonium chloride) and poly(styrene sulfonate) multilayers have been fabricated usi…
M2052 alloy is a MnCu based high damping alloy that shows high damping capacity and the superior workability. In the present work, the microstructure and damping behavior of the alloy in different solidification cooling rates are investigated with directionally cast alloy plate. For the variation of solidification coo…
We report a computer simulation study of systems of perfectly aligned molecules interacting through the Gay–Berne (GB) potential model for two different values of the molecular anisotropy parameter κ, namely 3 and 4.4. The models are appropriate to gauge the effects of strong aligning fields on the thermodynamics and…
The luminescence characteristics of europium-ion activated Y3Al5O12 (YAG:Eu3+) phosphors prepared via a sol-gel process were investigated in the vacuum ultraviolet (VUV) region using synchrotron radiation. An intense red emission due to D05→F17 transition of Eu3+ ions is produced under excitation at 147nm. The intensi…
The hydrogen-alkali metal bond is simple and archetypal, and thus an ideal model for studying the nature of highly polar element-metal bonds. Thus, we have theoretically explored the alkali metal hydride monomers, HM, and (distorted) cubic tetramers, (HM)4, with M = Li, Na, K, and Rb, using density functional theory (…
A simple procedure to detect light polarization by use of crossed polarization gratings in photo-cross-linkable liquid crystals is presented. Crossed polarization gratings consisting of four anisotropic gratings with different grating vectors were designed according to the theoretical expectation obtained on the basis…
Abstract The dynamic glass transition and the dilatometric glass transition temperature are simultaneously characterized in thin films of hyperbranched aromatic polyesters by broadband dielectric spectroscopy and capacitive scanning dilatometry. A diverging thickness dependence is detected: while the temperature posit…
[structure: see text] Three strands of natural collagen are linked by covalent bonds prior to their folding into a triple helix. We report on a synthetic collagen in which the strands are pendent on a rigid macrocyclic scaffold of C(3) symmetry. The scaffold confers substantial conformational stability upon the collag…
The synthesis of 5,10,15,20-tetraphenyl-2-thia-21-carbaporphyrin [S-confused thiaporphyrin, (SCPH)H] was optimized. The formation of the phlorin was detected, which was saturated at the meso carbon adjacent to thiophene. Phlorin converted readily to (SCPH)H in the final oxidation process. Insertion of cadmium(II) and…
Linear optical properties of two types of poly(phenylquinoxaline) (PPQ) are studied by multiwavelength prism coupling technique and optical absorption spectroscopy. Surface roughness measurements are done using atomic force microscopy. PPQs form smooth films of high optical quality having refractive indices above 1.7…
Reminiscent of a snowflake: The dimer of a hydroxy-substituted oligosilane dendrimer (see picture, left; Si yellow, C green, H white, O red) is remarkably stable according to IR spectroscopy and DFT calculations. Strong intermolecular hydrogen bonds are not only the glue that holds the “silicon snowflake” together, bu…