Materials Literature
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Abstract This article investigates the effects of nanoparticles on cell morphology and foam expansion in the extrusion foaming of metallocene polyethylene/wood fiber nanocomposites with a chemical blowing agent. The results indicate that the addition of clay generally reduces the cell size, increases the cell density,…
Abstract New polymeric thermosets were prepared through the bulk free‐radical copolymerization of 100% conjugated linseed oil, acrylonitrile, and divinylbenzene. Under the appropriate reaction conditions and with the appropriate curing sequence, 61–96 wt % of the oil was incorporated into the crosslinked thermosets. T…
Abstract N ‐trimellitylimido‐ L ‐methionine ( 3 ) was prepared by reaction of trimellitic anhydride ( 1 ) with ‐ L ‐methionine ( 2 ) in acetic acid solution at refluxing temperature. This diacid was reacted with thionyl chloride, and N ‐trimellitylimido‐ L ‐methionine diacid chloride ( 4 ) was obtained in quantitative…
Keratins are self-organized proteins that are abundantly available in wool, feather, human hair, etc., making them a potential cheap feedstock for the modification of amino acids. This paper explores the hydrolysis of keratin in water under specific pressure-temperature conditions where the hydrolysis through scission…
Nanotechnology provides a variety of nanoscale tools for medicine. Among them nanoparticles are revolutionizing the field of drug delivery. These drug nanocarriers have the potential to enhance the therapeutic efficacy of a drug, since they can be engineered to modulate the release and the stability and to prolong the…
We consider a nonlocal perturbation of an isoperimetric variational problem. The problem may be viewed as a mathematical paradigm for the ubiquitous phenomenon of energy-driven pattern formation associated with competing short and long-range interactions. In particular, it arises as a Γ-limit of a model for microphase…
The dynamics of colloidal spheres near to a wall is studied with an evanescent wave scattering setup that allows for an independent variation of the components of the scattering wave vector normal and parallel to the wall. The correlation functions obtained with this novel instrumentation are interpreted on the basis…
Abstract The use of plasticizers with low environmental impact is one of the most interesting research fields in the plasticizer additives industry because of the possible toxicity of o ‐phthalates. Among the wide variety of new plasticizers, it is important to note the use of di(isononyl) cyclohexane‐1,2‐dicarboxylat…
Kinetics of air oxidation of MgO–C–Al refractory at 600°–1300°C were investigated using the software based on the modified shrinking core model (KDA). Commercial bricks containing 88.5% MgO, 10% residual carbon, and 1.5% aluminum anti‐oxidant were oxidized isothermally with air. Combination of experimental data with m…
Calcium zirconate (CaZrO 3 ) powder was synthesized using calcium chloride (CaCl 2 ), sodium carbonate (Na 2 CO 3 ), and zirconia (ZrO 2 ) powders. On heating, CaCl 2 reacted with Na 2 CO 3 to form NaCl and CaCO 3 . NaCl–Na 2 CO 3 molten salts provided a liquid reaction medium for the formation of CaZrO 3 from in situ…
A series of zinc(II) diimine bis(thiolate) complexes with photochromic diarylethene-containing phenanthroline ligands was synthesized, and their photophysical and photochromic properties were studied. The X-ray crystal structures of two of these complexes have been characterized. All complexes exhibit strong 3LLCT pho…
Abstract The achievement of structural control over thioether‐bridged mesoporous organosilicas is reported. The mesoporous materials have been synthesized by co‐condensation of bis[3‐(triethoxysilyl)propyl]tetrasulfide (TESPTS) and tetramethoxysilane (TMOS) in acetic acid/sodium acetate buffer solution (HAc–NaAc, pH 4…
Amphiphilic, PEGylated gold nanoparticles, of approximately 2 nm average core diameter, were synthesized by reduction of hydrogen tetrachloroaurate in the presence of the ligand (1-mercaptoundec-11-yl)tetra(ethylene glycol). These PEGylated gold nanoparticles were found to assemble cleanly at the oil-water interface.…
The synthesis of a variety of well-defined diblock copolymer brushes, including poly(methyl methacrylate) (PMMA)- b -poly(2-(dimethylamino)ethyl methacrylate) (PDMAEMA), PMMA- b -poly(styrene) (PSty), and PSty- b -poly(methyl acrylate), was achieved via surface immobilized reversible addition−fragmentation chain trans…
Abstract By employing commercial poly(ethylene oxide)–poly(propylene oxide)–poly(ethylene oxide) (PEO–PPO–PEO) block copolymers as templates in near‐neutral aqueous solutions in the absence of organic cosolvents, unilamellar siliceous vesicles and nanofoams with ultrahigh pore volumes (> 3 cm 3 g –1 ) are successfu…
High Resolution Image Download MS PowerPoint Slide Real-time in situ Raman spectroscopy is used to probe the near-surface structure of α-Mn 2 O 3 nanocrystals during methane combustion for the first time. A surface phase-transformation from α-Mn 2 O 3 to Mn 3 O 4 -like species, as evidenced by the formation of a singl…
As a step toward the elucidation of the mechanistic pathways governing the known bioactivity of polyoxometalates (POMs), two representative molecules of this class of chemicals, the wheel-shaped [NaP(5)W(30)O(110)]14- (P(5)W(30)) and the Keggin-type anion [H(2)W(12)O(40)]6- (H(2)W(12)), are shown, by two independent t…
An inert Pt(II)−py bond (py = pyridyl) is considerably labilized upon UV irradiation. On the basis of this phenomenon, a kinetically inert Pt(II)-linked coordination ring is rapidly catenated on irradiation via Pt(II)−py photodissociation.
Various properties of ceramics can be significantly influenced by the presence of grain boundaries. The influence on the properties is closely related to the grain‐boundary atomic structures. As different grain boundaries have different atomic structure, different grain boundaries have different influence on the prope…
The optical constants of vanadium dioxide (VO 2 ) films were determined at visible and near-infrared wavelengths at various temperatures during a semiconductive–metallic phase transition by ellipsometric analysis with Lorentz-oscillator formulae. The reversible changes in optical constants against temperature due to t…