Materials Literature
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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…
To add stable antimicrobial properties to woods, an amphoteric sterilant, 3-(trimethoxysilyl))propyl (carboxymethyl) decylmethyl ammonium hydroxide inner salt (TMSAH) was applied to the sol-gel process, as SiO 2 wood-inorganic composites were prepared. The obtained TMSAH-added SiO 2 composites could reveal the high an…
Hexagonal mesoporous silica-supported molybdenum oxide exhibits much higher catalytic activity for the metathesis of oct-1-ene in the liquid phase, compared with MoO3 on normal porous silica and MoO3 on γ-alumina.
Thermogravimetric and differential thermal analyses of mesoporous zirconias obtained from anionic surfactants by a scaffolding mechanism reveal interesting differences between the samples prepared from long-chain sulfates or sulfonates, which lose their hydration water in two steps, and those obtained from long-chain…
The synthesis and characterization of a novel inorganic/organic hybrid material is described; the 3-D framework consists of InO6 octahedra which are linked by inorganic phosphate and organic oxalate anions to generate intersecting tunnels in which piperazinium cations and water molecules reside.
The accumulation of space charge in XLPE (cross-linked polyethylene), cross-linked using DCP (dicumyl peroxide) or a silane-based grafting process, was studied via the LIPP (laser-induced-pressure-pulse) technique. Planar samples 0.5 mm thick were obtained from the XLPE insulation of power distribution cables. DC fiel…
MnIII ions that replace a few percent of the framework AlIII sites in a microporous aluminophosphate—number 18, with a pore aperture of 3.8 Å—function as catalytically active centres for the selective oxidation of dodecane preferentially at C1 and C2.
The deformation behaviour of rubber toughened poly(methyl methacrylate) (PMMA) was studied using real time small angle X-ray scattering (SAXS) with a synchrotron radiation source. The invariant analysis method was used to analyze the influence of rubber particle concentration and rubber cross-linking density on craze…
The molecular structure and conformational behaviour of 2,2′-bipyrrole (α-BPy), 2,2′:5′,2″-terpyrrole (α-TPy) and 2,2′:5′,2″:5″,2‴-quaterpyrrole (α-QPy) have been determined by abinitio HF, MP2 and density functional theory methods, using the 6-31G* basis set. The syn↔anti interconversion process through internal rota…
DFT-B3LYP calculations are performed on 4-ring models of aluminophosphates (AlPOs) and silico-aluminophosphates (SAPOs). The results are used to fit the parameters of ion pair shell model potential functions. The potentials obtained are tested in lattice energy minimizations for berlinite and the microporous materials…
Crystalline structures and surface morphologies of annealed RuO 2 and Ru thin films were investigated using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The annealing was performed in oxygen and argon ambient and high vacuum in the temperature range of 400–800° C. In oxygen ambient annealing, the su…
In vitro corrosion resistance and ion dissolution of commercial pure titanium with different surface microroughness are studied adopting constant potential meter and atomic absorption spectroscopy. In terms of the surface roughness, titanium samples are divided into 5 groups: smooth surface, machining surface, 2 diffe…
The biological attack of microorganisms on rubber materials was investigated in order to evaluate possible contributions of biotechnology for refinement and recycling of used rubber products. Adaptation of microbial enrichment cultures with tire crumb material for several months resulted in enhanced growth of microorg…