Materials Literature
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Article An X-Ray Diffraction Study of the Crystalline to Amorphous Phase Change in Cellulose During High-Energy Dry Ball Milling was published on January 1, 1998 in the journal Holzforschung (volume 52, issue 5).
Methane elimination during thermolysis of GaMe3 with PhHNNH2 yields sequentially dimeric [Me2Ga{µ-N(H)N(H)Ph}]2, tetrameric [MeGa{µ-N(H)NPh}]4 and, ultimately, GaN; the X-ray structure of the tetramer shows a novel Ga4N8 cage.
In the present work, rubber-toughened polypropylenes (TPOs) with different properties of the rubbery phase, consisting in different degrees of rubber dispersion and different levels of rubber crystallinity, were considered. The flame-treated surfaces of these materials and their interfaces with a commonly used primer…
A correlation between the hydrophobic characteristics and accumulation of static charge on several insulating surfaces (ceramic and non-ceramic) is studied. Although numerous experimental studies on the loss and recovery of hydrophobicity on insulator surfaces have been carried out, no efforts for establishing a corre…
B6O sintered compacts were prepared by high pressure and temperature treatments of in-laboratory synthesized B6O powder. Sinterable B6O powder with grain sizes of 1.2-1.4μm was formed above 1300°C in 4 hours in a pure argon stream by a solid-liquid reaction between amorphous boron and B2O3 powders. Single phase sinter…
We present new experimental results of the backscattering coefficient (η) for C, Al, Cu, Ag and Au targets bombarded with low energy electrons (0.6-6 keV) at normal angles of incidence. The present data show a clear monotonic increase in the backscattering coefficient with increasing target atomic number for electrons…
Control of the surface areas of the calcined zirconium(iv) oxides arises from the extent of equilibration permitted between the hydrolysed zirconyl oxychloride and the surfactant prior to calcination. The properties of the zirconia–surfactant materials, which are formed by a scaffolding and controlled drying mechanism…
The porosification of silicon can be achieved by the partial electrochemical dissolution (anodization) of the surface of a silicon wafer. The degree of porosity is dependent on the anodization parameters and can generally be controlled within the constraints imposed by substrate dopant type and concentration. Control…
Abstract Thin-section production of diamict samples presents many problems, primarily as a result of incomplete impregnation. This problem is investigated in diamicts of known glacial, glaciomarine, and subaerial origin. The inherent sedimentological characteristics, rather than particular mode of de-position, appears…
Cellulose acetate phthalate (CAP) is a commonly used enteric coating polymer. CAP powder has been studied by various methods to determine characteristics that have an influence on its functionality. While some of the parameters are well known, such as free-acid content and substituent composition, new methods have bee…
Solutions of type I acid soluble collagen were studied in light and electron microscopy at concentrations over 40 mg/ml. Banded patterns spontaneously emerge in samples observed between crossed polars between slide and coverslip. The textures are interpreted as precholesteric, appearing at the transition between the i…
Irradiation of W10O324– or PW12O403–, alkanes and methyl cyanoformate in CH3CN solution produces either the corresponding nitriles or α-iminoesters with high selectivity, depending on the temperature, via a mechanism involving two roles for the polyoxotungstate.
Granulation tissue formation was studied in viscose cellulose sponges with different cellulose contents and sizes after subcutaneous implantation in rats. Samples were removed and studied histologically and histomorphometrically 1-16 weeks after implantation. The implants with lower cellulose content and smaller size…
[Cu8(µ8-Se)[Se2P(OPri)2]6}, the first discrete CuI8 cubane in which each face of the cube is bridged by a diselenophosphate ligand and has an interstitial selenide ion (Se2–), is reported.
Une mise au point sur le polymorphisme très riche des n-alcanes CnH2n+2, n allant de 22 à 27 est proposée au travers d'une étude énergétique et cristallographique de chacun des composés (caractérisation de 10 phases solides et de 12 transitions). Dans toutes ces phases, les molécules sont parallèles entre elles et dis…
The temporal evolution and morphology of grain growth in three dimensions were simulated by Monte Carlo method. In order to prevent impingement of grains of like orientation, new algorithm was adopted. The anisotropy of the grain boundary energy is incorporated into the model. Compared with the case in which no anisot…
5,10,15,20-Tetra(4-n-butylphenylethynyl)porphyrin has been synthesised from 4-n-butylphenylpropynal and converted into its zinc(II) and lead(II) complexes. The solution electronic spectra of these porphyrins are compared to the analogous complexes of 5,10,15,20-tetra(trimethylsilylethynyl)porphyrin. The aryl rings of…
Nonwood or agro-based fibers are a potential source of pulping material. However, these fibers have tremendous variations in chemical and physical properties as compared to wood fiber. This study presents some chemical and physical properties of nonwood fibers derived from selected tissues of various monocotyledonous…
We have employed scanning electron microscopy (SEM), scanning tunnelling microscopy (STM), wide-angle X-ray scattering (WAXS), small-angle neutron scattering (SANS) and adsorption isotherms to characterise the recompressed, exfoliated graphite ‘Papyex’. The substrate is found to consist of ca. 60% void space, most of…
Hybrid composite laminates consisting of layers of metal foils bonded together with fiber-reinforced resin show great promise as a fatigue-resistant material. The hybrid titanium composite laminate (HTCL) incorporates the mechanical advantages of existing hybrid composite laminates such as ARALL and GLARE while extend…