Materials Literature
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Motivated by the recent discovery of a low temperature spin liquid phase in layered organic compound $\ensuremath{\kappa}\text{\ensuremath{-}}{(\mathrm{ET})}_{2}{\mathrm{Cu}}_{2}{(\mathrm{C}\mathrm{N})}_{3}$ which becomes a superconductor under pressure, we examine the phase transition of Mott insulating and supercond…
A layer-by-layer deposited polyelectrolyte spacer is used to attach CdSe nanocrystals (NCs), dye molecules and fluorescein-labelled bovine serum albumin (BSA-FITC) to flat glass and rough silver island surfaces in order to study the effect of spacer thickness on homogeneity and surface concentration of fluorophore cov…
Abstract The knowledge of biomedical implants ranging from drug delivery devices to tissue engineering and based on bioresorbable polymer composites is increasing, but the study of the crystallization kinetics of these kinds of composites is seldom a concern. The focus of our experimental research was the nonisotherma…
A novel mixed technique based on wet-chemistry plus mechanochemical activation has been applied to obtain the Na 1- x Sr x Nb 1- x Ti x O 3 solid solution with x = 0.1, 0.25, 0.5, 0.75, and 0.9. The wet-chemistry step aims at a better mixing of the constituent elements before the mechanical treatment, and thus, at a b…
Abstract Low temperature plasma (LTP) treatment was applied to wool fabric with the use of a nonpolymerizing gas, namely oxygen. Properties of the LTP‐treated samples including low stress mechanical behavior, air permeability, and thermal characteristics were evaluated in this study. Kawabata evaluation system fabric…
Abstract The possibility of organic modification of montmorillonite (MMT) in hydrocarbon solvents by employing ionic liquid‐type surfactants was investigated. As a first example, 1‐methyl‐3‐tetradecylimidazolium chloride ([C 14 mim] + Cl − ) was used to treat pristine MMT in xylene. The dispersion of MMT in xylene was…
DnaG is the primase that lays down RNA primers on single-stranded DNA during bacterial DNA replication. The solution structure of the DnaB-helicase-binding C-terminal domain of Escherichia coli DnaG was determined by NMR spectroscopy at near-neutral pH. The structure is a rare fold that, besides occurring in DnaG C-te…
Super skinny: TaS2 nanowires with a high aspect ratio (50 000:1; see micrograph) are synthesized from the elements in a one-step reaction. The single-crystalline 2H-TaS2 nanowires are superconducting, with a transition temperature (Tc=3.4 K) that is enhanced compared to that of the bulk material (Tc=0.8 K).
Abstract Wheat straw is an abundantly available and potentially valuable biomass that is currently under‐exploited. In this study, the feasibility of using wheat straw as a filler in high‐density polyethylene (HDPE)‐based composites was explored. Straw was treated with the white‐rot fungus Pleurotus ostreatus with the…
Abstract Chitosan membranes were first prepared by a thermally induced phase separation method and then alginate was coated on one side of the membranes by a modified dialysis apparatus to prepare alginate/chitosan membranes (A/C membranes). Electron spectroscopy for chemical analysis (ESCA), scanning electron microsc…
Abstract In this article we present the result of a comparative study of two kinds of polymerization methods—solution polymerization (sol. poly.) and dispersion polymerization (dis. poly.) for grafting polymer onto silica. As a model for the grafting polymerization reaction, styrene was chosen as the monomer and azo d…
Abstract A series of segmented polyurethanes (PUs) with novel thermosensitive shape‐memory behavior were synthesized via the in situ addition of a small amount of 1‐octadecanol (ODO) to a PU system. For comparison, liquid paraffin (LP) modified PUs were also synthesized. The effects of a small amount of ODO or LP on t…
Abstract Poly(vinyl alcohol) (PVA) can be dissolved in a nonaqueous medium in the presence of catalytic concentration of ethyl nitrate dimethyl sulfoxide, C 2 H 5 ONO 2 ·DMSO. From the PVA solution, poly(vinyl propionate), PVPR was prepared by the homogeneous esterification of PVA with propionic acid. The ester thus f…
Abstract Acrylic acid carboxylated acrylic rubber (ACM) and itaconic acid carboxylated acrylic rubber were prepared by 60 Co‐γ‐ray‐induced emulsion copolymerization. The polymers were characterized using FTIR and 13 C NMR spectroscopies. The acid value was determined with nonaqueous titration method. The molecular wei…
Abstract Poly(butylene terephthalate)/high density polyethylene (PBT/HDPE) blends and PBT/HDPE‐grafted maleic anhydride (PBT/HDPE‐ g ‐MAH) blends were prepared by the reactive extrusion approach, and the effect of blend compositions on the morphologies and properties of PBT/HDPE blends and PBT/HDPE‐ g ‐MAH blends was…
Abstract Recent studies on conducting polymers have demonstrated that polymers of 3‐substituted thiophene produce very stable compounds. Although this kind of substitution improves the regularity, structural defects still exist. To overcome this drawback, the polymerization of 3,4‐disubstituted thiophene is proposed a…
Abstract In the case of the electrically conductive master batch (ECMB) for fibers application, higher filler content required to produce adequate conductivity can be accompanied by a reduction in spinnability and mechanical property of final fibers. To minimize these problems, ECMB with the character of lower percola…
Hardfacing is one of the surfacing methods most widely employed in valve manufacturing industries to deposit Stellite 6, a cobalt based alloy, on low carbon steel valve seat rings to enhance specific properties such as wear and corrosion resistance. Gas tungsten arc welding (GTAW) process is used for hardfacing smalle…
Abstract We report the graft copolymerization of acrylic acid onto the polypropylene (PP) melt‐blown nonwovens induced by electron beam (EB) preirradiation in this article. The occurrence of the graft copolymerization was confirmed by means of XPS, FTIR, and SEM. The effects of preirradiation dose, monomer concentrati…
We consider a class of continuum models of epitaxial growth of thin films with two competing mechanisms: (1) the surface relaxation described by high-order gradients of the surface profile and (2) the Ehrlich–Schwoebel (ES) effect which is the asymmetry in the adatom attachment and detachment to and from atomic steps.…