Materials Literature
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Abstract Phosphonate scale inhibitors (SIs) are commonly applied for barite scale prevention in oilfields. Their inhibition efficiency (IE) is affected by the barium sulphate saturation ratio (SR) of the brine mix as well as in the presence of divalent cations, Ca2+ and Mg2+. What is less well known is that the precis…
The temperature dependence of the magnetic structure of ${\text{Mn}}_{3}{\text{Sn}}_{2}$ has been determined down to 2 K from powder neutron diffraction and $^{119}\text{S}\text{n}$ M\"ossbauer spectroscopy experiments. The ${\text{Mn}}_{3}{\text{Sn}}_{2}$ compound crystallizes with the ${\text{Ni}}_{3}{\text{Sn}}_{2}…
Abstract The crystallization behavior of pure PCL and PCL in blends with crosslinked rubber particles was studied under (non)isothermal crystallization conditions, where the rubber particles were grafted with PCL chains via hydrogen abstraction of the aliphatic moieties in PCL. The crystal growth and the organization…
Abstract A new water‐soluble zwitterionic oligofluorene bearing carboxylic acid and quaternary ammonium as pendant groups (OF‐1) is synthesized and characterized. It forms aggregates by intermolecular electrostatic interactions and exhibits similar light‐harvesting ability as that of conjugated polymers. Efficient flu…
In this work we report a first principles study of benzonitrile (BZN) interaction with pristine and Fe-doped single-walled carbon nanotubes (SWNTs), graphene, and C 60 . The results show that the BZN molecule weakly adsorbs on SWNTs, graphene, and C 60 through π−π aromatic ring stacking. This interaction can be consid…
Abstract The fracture behavior of carbon black‐filled natural rubber compounds, differing in filler content, was studied performing tensile tests in biaxial loading conditions, using a central notched cross‐shaped specimen. The test consisted of two steps: a drawing step was initially performed loading the specimen in…
Abstract The objective of this study was the investigation of techniques for dispersing alumina nanoparticles with different surface modifications in epoxy resin. In order to prepare the matrix suspension, high contents of fillers (up to 50 wt %) were dispersed by conducting shear mixing techniques in a high performan…
Abstract In this study poly(vinlyl chloride) (PVC) was modified by using ethylenediamine, diethylenetriamine, and ethanolamine as a crosslinker in dimethylformamide. Reaction variables were optimized for getting desired crosslinked PVC, which was further reacted with maleic anhydride to form graft polymer. The anhydri…
We present a combined experimental and theoretical study on the $\text{Mn}\text{ }3d$ orbital occupation in orthorhombic ${\text{DyMnO}}_{3}$ single crystals. We have observed a very strong polarization dependence in the $\text{Mn}\text{ }{L}_{2,3}$ x-ray absorption spectra, indicative for a distinct anisotropic orbit…
Summary This study was conducted to evaluate the possibility of pumpkin oil cake (PuOC) addition to gelatin in attempt to form biodegradable composite films. Different amounts of PuOC (40–95%) were added to gelatin and films with improved characteristics were made. The best tensile strength (TS) had the film made of 6…
Abstract Polyurethane (PU) based on castor oil and hexamethylene diisocyanate (HDI) was synthesized by a two‐step method in the presence of dibutyltin dilaurate (DBTDL) as catalyst. The PU obtained was blended with various amounts of cellulose fibers extracted from alfa stems to prepare composite materials. The influe…
Abstract This paper presents an example of Riemann surface lamination with at least two ergodic invariant measures. The generic leaves for those measures are of different growth and have different numbers of ends.
Based on a mesoscopic theory we investigate the nonequilibrium dynamics of a sheared nematic liquid, with the control parameter being the shear stress ${\ensuremath{\sigma}}_{xy}$ (rather than the usual shear rate, $\stackrel{\ifmmode \dot{}\else \.{}\fi{}}{\ensuremath{\gamma}}$). To this end we supplement the equatio…
We report here on our efforts to develop new strategies for the synthesis of alpha-tocopherol, the biologically most significant member of the vitamin E family. This review comprises five new methods to generate the chiral chromane of alpha-tocopherol with overall up to 29% yield from commercially available material a…
Abstract This paper reports a new method for the synthesis of phosphorus tagged polymeric scale inhibitors, laboratory based testing to validate these new molecules and their application in oil field reservoirs with comparison to existing commercially available technologies. Existing phosphorus tagged polymeric scale…
Abstract Sulphide scales (iron sulphide, FeS, zinc sulphide, ZnS, and lead sulphide, PbS) are occurring more commonly in many water producers and these deposits and colloids may lead to various production problems. In addition to being a problem, the presence of these sulphides also affects barium sulphate deposition.…
Transport properties and magnetization measurements of the ${\text{K}}_{x}{\text{MoO}}_{2\ensuremath{-}\ensuremath{\delta}}\text{ }(0\ensuremath{\le}x\ensuremath{\le}0.25)$ compound are reported. The compound crystallizes in the oxygen deficient ${\text{MoO}}_{2}$ monoclinic structure with potassium atoms occupying in…
This work presents the photoinduced wavelength shift of a side-polished fiber Bragg grating (SPFBG) with a photoresponsive liquid crystal (LC) overlay. The reflection peak wavelength of the SPFBG is tuned by refractive index (RI) modulation, which comes from the phase transition of the overlaid photoresponsive LC unde…
Abstract In the context of the preservation of cultural heritage, the treatment of paper by an aminoalkylalkoxysilane, or its mixture with dimethyldiethoxysilane (DMDES), gave encouraging results. The condensation experiments presented here, carried out in alcohol medium using aminopropylmethyldiethoxysilane (AMDES) a…
Abstract In the present work, highly efficient epoxidation of alkenes catalyzed by Mo(CO) 6 supported on multi‐wall carbon nanotubes modified by 2‐aminopyrazine, APyz‐MWCNTs, is reported. The prepared catalyst was characterized by elemental analysis, scanning electron microscopy, FT IR and diffuses reflectance UV–vis…