Materials Literature
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Abstract The kinetics of thermal degradation of standard and commercial polyethylene (PE) samples is investigated, by employing different methods like Flynn‐Wall‐Ozawa, Coats‐Redfern, Kissinger, and Augis‐Bennett. The order of reaction obtained was 0.741 and 1.124 for standard and commercial samples, respectively. The…
Previous cylindrical hyperlenses were realized with metamaterial with only one component of the constitutive parameters negative. In this letter, we show that metamaterials with different combinations of negative and positive constitutive parameters can also be used to realize hyperlenses. The metamaterial forming the…
Abstract The effect of a hybrid system of nanoclay and triphenyl phosphate (TPP) on the fire retardancy of a polycarbonate (PC)/acrylonitrile–butadiene–styrene (ABS) blend was examined in this study. The nanoclay in the polymers decreased the peak heat release rates (PHRRs) with no significant effect on the ease of ig…
Optically active binaphthyl-azobenezene cyclic dyads were synthesized to develop a photochromic switching molecule. Azobenezene moieties were cis-trans isomerized by photoirradiation. As a reflection of the structural change, the specific optical rotation and circular dichroism underwent significant shifts. Under cert…
Abstract Bloodmeal mixtures containing SS, water, SDS and urea were extruded and injection‐molded. Increased chain mobility with sufficient plasticization during processing increased the amount of available amino acids for strong water/protein interactions. Materials containing low water and increased SS had reduced t…
The skeleton of siliceous sponges consists of amorphous biogenous silica (biosilica). Biosilica formation is driven enzymatically by means of silicatein(s). During this unique process of enzymatic polycondensation, skeletal elements (spicules) that enfold a central proteinaceous structure (axial filament), mainly comp…
In this study, we have investigated the photophysical properties of free-base subpyriporphyrins by changing the peripheral substituents from phenyl to nitrophenyl groups. While the electron withdrawing nature of nitrophenyl substituent gives rise to a noticeable perturbation in the absorption spectrum arising from the…
Three‐dimensionally periodic porous carbon membranes are prepared through the carbonization of poly(furfuryl alcohol) in the void spaces of opal materials consisting of monodispersed silica particles. Inverse opal carbon (IOC) membranes are obtained by the removal of silica templates. The obtained IOCs have three‐dime…
Formation of nano-fibrillar composite structures provides an effective method for preparing thermoplastic nanofibers. By mixing two immiscible thermoplastic polymers in a twin screw extruder, poly(trimethylene terephthalate) (PTT) formed nano-fibrillar morphology in cellulose acetate butyrate (CAB) matrix, and then PT…
Aiming at understanding the origin of the electronic contribution to ferroelectric polarization in undoped manganites, we evaluate the Berry phase of orbital-polarizable Bloch electrons as an orbital ordering (OO) establishes in the background of an antiferromagnetic E-type configuration. The onset of OO is tuned by t…
Gold nanoparticles can be synthesized by reducing chloroaurate(III) ions in the presence of peptides. Here, such reduction for serine and tyrosine is studied by density functional theory including solvent effects. We find that the formation of chloroaurate complexes of these amino acids is thermodynamically viable and…
This work studies the synergistic effect of carbon nanofiber (CNF) and sub-micro filamentary nickel nanostrand on the thermal and electrical properties, as well as the electro-active shape memory behavior, of a shape memory polymer (SMP) nanocomposite. The combination of electrical CNF and electromagnetic nickel nanos…
The absence of backscattering in metallic nanotubes as well as perfect Klein tunneling in potential barriers in graphene are the prominent electronic characteristics of carbon nanostructures. We show that the phenomena can be explained by a peculiar supersymmetry generated by a first order Hamiltonian and zero-order s…
Self-organized nanocrystal architectures with subnanometric spatial resolution were obtained by mimicking the biological crystal growth. The key step of this facile, one-pot, biomimetic route is to induce the self-assembly of the artificial nanopore cucurbit[7]uril with metal ions, which generates supramolecular aggre…
Animal magnetism: Two high-nuclearity homometallic Mn19 and heterometallic Na2Mn15 clusters containing supertetrahedral building units have been synthesized (see picture). Both clusters possess large spin states and small anisotropies. Significant magnetocaloric effects were observed under the calculation of magnetiza…
Abstract Two donor/acceptor/donor‐type pyrrole‐incorporated monomers, 4,7‐di(1 H ‐pyrrol‐2‐yl)benzo[c][1,2,5]thiadiazole ( M1 ) and 4,7‐di(1 H ‐pyrrol‐2‐yl)benzo[c][1,2,5]selenadiazole ( M2 ), were synthesized and polymerized electrochemically. The resulting polymers ( P1 and P2 ) were investigated in terms of their e…
For optoelectronic applications, colloidal CdSe quantum dots (QDs) have been integrated into solid devices by using optically transparent polymer matrices that embedded the colloidal QDs. We systematically studied the effect of annealing and photoactivation on the band-band (BB) and surface trap state (STS) transition…
1-Cyano-1,2-bis(biphenyl)ethene (CNBE) derivatives with a hexa(ethylene glycol) group as an amphiphilic side chain were synthesized and the self-assembling character and fluorescence behavior were investigated. The amphiphilic derivatives showed aggregate-induced enhanced emission (AIEE) in water and in the solid stat…
Composites of polystyrene (PS) and poly(ethylene‐co‐vinyl acetate) (EVA) with organically modified zirconium phosphate (OZrP) were prepared by melt blending. Their morphologies were assessed by X‐ray diffraction and transmission electron microscopy, while the thermal stability and flammability properties were characte…
Irradiation with high-energy photons (10.2–11.8 eV) was applied to small diamondoids isolated in solid rare gas matrices at low temperature. The photoproducts were traced via UV absorption spectroscopy. We found that upon ionization the smallest of these species lose a peripheral H atom to form a stable closed-shell c…