Materials Literature
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Abstract A polymeric ligand (thiourea‐formaldehyde resin ‐ TUFR) bearing nitrogen and sulfur donor groups was synthesized by the polycondensation of thiourea and formaldehyde in acidic medium and its polychelates were prepared in alcoholic solution of metal ions such as Mn(II), Co(II), Ni(II), Cu(II) and Zn(II). The T…
Imidazole-substituted metalloporphyrins are valuable for studies of self-assembly and for applications where water solubility is required. Rational syntheses of porphyrins bearing one or two imidazol-2-yl or imidazol-4-yl groups at the meso positions have been developed. The syntheses employ dipyrromethanes, 1-acyldip…
Too much fiber? Protein fibers play an important role in cellular processes, but are also involved in protein-folding diseases, such as Alzheimer's disease. Modern screening and validation models allow the investigation of the aggregation and deaggregation kinetics of protein fibers (see scheme). These studies can ser…
Blinking marvelous! In contrast to quantum dots (QDs) synthesized in organic solutions, CdTe QDs synthesized in aqueous solutions containing thiopropionic acid do not blink. The fluorescence of these QDs is steady under continuous laser excitation (see picture, the gray line is the background intensity). The presence…
A novel aqueous relatively low-temperature thin film growth technique has been developed to fabricate a new generation of smart and functional nanostructured metal oxide thin film materials. This chemical synthetic route uses stable and inexpensive metal inorganic salts and environment-friendly solvents. The nanomater…
Schwankungsfrei: Anders als in organischen Lösungsmitteln hergestellte Quantenpunkte (QDs) zeigen CdTe-QDs aus wässriger Thiopropionsäure-Lösung eine gleichmäßige Fluoreszenz unter kontinuierlicher Laseranregung (siehe Abbildung; graue Linie: Hintergrundintensität). Die Gegenwart von Thiogruppen auf der QD-Oberfläche…
Liquid-crystal phases with both solid and liquid characteristics are unique, since they exhibit chirality on both molecular and mesoscopic levels under special circumstances. We have studied binary composites formed by mixing of a chiral dimer (B-Ch), in which a bent core is covalently linked to a promesogenic cholest…
The depletion effect between two spherical colloidal particles in nonadsorbing polymer solutions is investigated using the self-consistent field theory. The density distributions of polymer segments, the depleted amount and depletion potential are calculated numerically in bispherical coordinates. The effects of chain…
A study of the soft-core to hard-core percolation properties of the hard-sphere fluid as a function of hard core (sphere) packing fraction, ζ, has been made using the Molecular Dynamics computer simulation method. The interparticle separation between the soft shells to achieve percolation, σ p , exhibits a monotonic d…
The world has recently been waking up to the urgent need to move away from fossil fuels and towards a low-carbon economy. To achieve this, we need a way of producing electricity that is efficient, widely applicable and cheap. At the same time, there has recently been an appreciation of the tremendous scope for making…
The validity of the application of the dissipative particle dynamics (DPD) method to ferromagnetic colloidal dispersions has been investigated by conducting DPD simulations for a two–dimensional system. First, the interaction between dissipative and magnetic particles has been idealized as some model potentials, and D…
Multipigment ensembles that feature (porphinato)metal components and appropriate ethyne- and oligoyne-based chromophore-to-chromophore connectivity can manifest large optical polarizabilities and hyperpolarizabilities by design. Their vectorial orientation and local environment are controlled upon incorporation into d…
Abstract This paper presents an overview of functional modifications of synthetic aliphatic polyesters and a new synthetic route to graft functional moieties onto the polyester backbone by a chemoselective approach. Aminooxy groups react efficiently and selectively with ketones or aldehydes to form oxime linkages unde…
Abstract Multiwall carbon nanotube (MWNT) was grafted with polyacrylate‐ g ‐poly (ethylene glycol) via the following two steps. First, hydroxyl groups on the surface of acid‐treated MWNT reacted with linear poly(acryloyl chloride) to generate graft on MWNT; secondly, the remaining acryloyl chloride groups were subject…
Acetobacter aceti converts ethanol to acetic acid, and strains highly resistant to both are used to make vinegar. A. aceti survives acetic acid exposure by tolerating cytoplasmic acidification, which implies an unusual adaptation of cytoplasmic components to acidic conditions. A. aceti citrate synthase (AaCS), a hexam…
Cell dynamics simulation is used to investigate pathways of sphere-to-cylinder transition in block copolymer melt under applied simple shear flow and electric field. Both fields can induce the transition when their strength is above some critical value. At weak fields the spherical phase is preserved, with spheres bei…
A series of polyaniline (PANI) oligomers was constructed from monomer units covalently linked to duplex DNA through N-(2-aminoethyl) groups bonded through cytosines. DNA oligomers containing the aniline monomers were treated with horseradish peroxidase (HRP) and H2O2 under conditions known to cause polymerization of a…
All change: The stable, diamagnetic, trigonal-bipyramidal CuIII complex (see picture) arising from one-electron oxidation of a CuII complex undergoes conversion into a paramagnetic octahedral CuIII complex upon addition of Cl− ions. Characterization of the complexes and density functional calculations indicate that th…
Based on the Bean–Rodbell model, which assumes a linear variation of exchange coupling with atom spacing, the magnetovolume effects in LaFe 13− x Si x ( x = 1.2–2.0) have been systematically studied. A relation between phase volume and magnetization is first obtained by comparing the structural and magnetic data colle…
Abstract Summary: While many experiments have been performed to examine the effects of administering CO 2 as a blowing agent in the foaming process, very few studies have investigated the use of N 2 for this purpose. In this study, foaming experiments were conducted in extrusion using HDPE as a polymeric material and…