Materials Literature
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Several interesting phenomena are observed when materials are put under pressure. The goal is to achieve modification and control over their mechanical and electronic (conduction) properties. Within this spirit, we have recently focused out attention into how carbon nanostructures respond to hydrostatic pressure. We p…
The surface tension and pressure of water in carbon nanotubes with diameters from 0.4 to 1.0 nm have been calculated and analysed in detail. In particular, it was shown that it is necessary to consider the Tolman correction during the calculation of these values.
The structural decay of wood (using “Obi” Japanese cedar) was studied by focusing on the effect of flame retardancy. The various flame retardants, including boron compound, used as one of the most popular flame retardants, were applied in this study. Thermogravimetric analysis, pyrolysis/gas chromatography/mass spectr…
We have studied the effect of hydrogen on the cohesion of two types of dislocation in bcc iron at an atomistic level, using the atom superposition and electron delocalization molecular orbital (ASED-MO) method. The most stable positions for one hydrogen at each dislocation core were determined. It was found that the t…
The effects of various cooling modes such as natural cooling mode, linear cooling mode, and controlled cooling modes type A and B in a batch cooling crystallizer on crystal size distribution (CSD) as well as the mean crystal size have been studied for DL-malic acid. The natural cooling mode was found to yield crystals…
Helical carbon nanotubes were produced on silica‐supported Co catalysts by chemical vapour decomposition of acetylene. Coiled nanotubes were examined. They have been found to be of various shapes, diameter, and pitch. Some of them are extremely long, up to 5 µm, with regular helices. The average outer diameter of coil…
The dilatation characteristics of MgxLiyAl(x=4, 8, 10, 12 and y=0, 3 wt-%) alloys were studied in the temperature range from 20°C to 380°C. The elastic–plastic mechanism of the release of thermal strains during heating is discussed. Aluminium affects only marginally the value of the coefficient of thermal expansion of…
Hexagonal cadmium selenide nanorods 32-170 nm in length and 12-28 nm in diameter were grown by a solvothermal technique by reacting cadmium chloride and selenium powders in ethylenediamine at 140 degrees C. Using electron microscopy, the shape, size, and crystal structure of the nanorods were determined. A detailed mi…
To enhance the validity of signal and optical reflectivity on DVD-RAM, in this study we performed variable laser recording power experiments, and established the theoretical model for simulating the features that of the groove/land and header on a DVD-RAM stamper. This is the first work showing the features of the gro…
Abstract Chrysotile from Thetford Mines in Quebec, Canada was treated first with mild formic or oxalic acid at concentrations of 0.5 to 2.0 N at 200°C in Teflon-lined 12.0 mL Parr bombs. The reaction products were identified by X-ray diffraction as a poorly crystalline Fe-bearing kerolite-like 2:1 layer silicate (whic…
The local structure of the chemical bond of iron ions implanted into SiO 2 glasses (implantation energy, 100 keV; fluence, 1 × 10 16 cm −2 ) is investigated using x-ray emission and absorption spectroscopy. The Fe L x-ray emission and absorption spectra are analyzed by comparing them with the corresponding spectra of…
A spectroscopic Stokes polarimeter is used to directly measure the linearly, circularly, and randomly polarized components of light obtained on transmission of unpolarized light through thick chiral nematic liquid-crystal cells in the stop band. The Stokes parameters are simulated to fit the experimental data by use o…
Filling of carbon nanotubes with metals or semi‐metals (such as Se, Bi, …) raises the possibility of novel nanomaterials synthesis with technologically interesting properties on a nanometric scale. Indeed it offers the possibility to enhance the physical properties of both the encapsulated and encapsulating materials.…
Abstract The structure of dioctahedral true micas such as muscovite and celadonitic muscovite (2 M 1 polytype, space group C 2/ c ) is mostly affected by variations of the octahedral Al ( VI Al) content. Crystals with greater Mg, Fe substitutions ( i.e. celadonitic muscovite) reduce the dimensional difference between…
To extend the technological potential of thermally induced ultrasonic emissions from the nanocrystalline silicon (nc-Si) devices we reported previously a driving mode suitable for operation in the audio-band has been studied. The device is composed of a patterned surface electrode, an nc-Si layer, and a single-crystal…
In recent years, several projects have advanced the research and development related to the automation of the protein crystallization process. However, the evaluation of crystallization states has not been completely automated yet. In the usual crystallization process, the researchers evaluate the crystallization grow…
Spinel ferrites, MFe 2 O 4 (M= Co, Ni, Cu, Zn) have been prepared by a redox chemical reaction between aqueous solutions of metal nitrates, ferric nitrate and oxalyl dihydrazide (ODH). On rapid heating the reaction mixtureundergoes an abrupt exothermic redox chemical reaction that facilitates atomic scale mixing of th…
Raman spectra of stoichiometric glass (g) g-As40Se60 have been investigated. It was observed that the increasing of excitation radiation energy h >E0 (E0 is pseudogap width) changes the shape and position of Raman peaks of g-As40Se60. The structure and vibration spectra of some As-Se clusters were calculated ap…
Upconversion fluorescence in an erbium-doped transparent oxyfluoride glass ceramic is studied by use of fluorescence decays and time-dependent fluorescence and excitation spectra. Sequential two-photon absorption upconversion and energy transfer upconversion are reported, and their origins are identified. Sequential t…
Aluminium is a very important material used in the semiconductor industry as an interconnection layer. The most popular method of depositing aluminium films is the physical vapour deposition (PVD) process. The objective of the present study is to improve aluminium film uniformity by optimising the process conditions t…