Materials Literature
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Readily recyclable biobased plastics were designed and synthesized utilizing the thermally reversible DA reaction. Furyl-telechelic poly(butylene succinate) prepolymers (PBSF(2)) were extended with bis- and tris-maleimide linkers (M(2) and M(3)) by the DA reaction in the bulk state to produce linear and network polyme…
We demonstrate a versatile methodology combining both covalent surface anchoring and polymer cross-linking that is capable of forming long-lasting coatings on reactive and nonreactive surfaces. Polymers containing reactive methoxysilane groups form strong Si-O-Si links to oxide surfaces, thereby anchoring the polymer…
Two dendron-based gelators with minor structure variations at the focal group are reported and they exhibit very different self-assembly behaviors. One of them acts as a lyotropic and thermotropic liquid crystal.
Colloids of gold and palladium nanoparticles have been prepared by the Solvated Metal Atom Dispersion (SMAD) method. Digestive ripening, a process involving mixing of the as-prepared gold and palladium colloids consisting of polydisperse nanoparticles and refluxing the mixture in the presence of a surfactant resulted…
Eu 2 O 3 ‐doped aluminoborosilicate glasses were prepared in air at high temperature. Luminescence measurements were used to investigate a valence change from Eu 3+ to Eu 2+ ions in the aluminoborosilicate glasses. The results showed that the doped Eu 3+ ions were partially reduced to Eu 2+ in the Eu 2 O 3 :RO–Al 2 O…
Functionalized collagen that incorporates exogenous compounds may offer new and improved biomaterials applications, especially in drug-delivery, multifunctional implants, and tissue engineering. To that end, we developed a specific and reversible collagen modification technique utilizing associative chain interactions…
Every colloid has a gold lining: The direct synthesis of hydrogen peroxide from hydrogen and oxygen is attracting much interest as an alternative method for producing H2O2. Pd-Au bimetallic nanocolloid exhibits high catalytic activity for the direct synthesis of H2O2 from H2 and O2. The high activity results from the…
A ZrB 2 –SiC–ZrC ceramic was produced by reactive hot pressing using Zr, Si, and B 4 C as raw materials. The kinetics of the reaction process was studied. The reduction of powders by ball milling is of crucial importance for the sintering. The self‐propagating high‐temperature synthesis reaction between the raw powder…
Metamaterials provide unprecedented freedom and flexibility in the creation of new structures, which control electromagnetic wave propagation in very unusual ways. Very recently various theoretical designs for an electromagnetic cloak were suggested and an experimental realization of a partial cloak operating in a two…
A new series of encapsulated fluoride polyhedral oligomeric silsesquioxane (POSS) materials, [(CH 3 ) 4 N + ][F − @(R 8 Si 8 O 12 )], where R = vinyl, phenyl, styrenyl, trifluoropropyl, nonafluorohexyl, or tridecafluorooctyl, were synthesized by the reaction of tetramethylammonium fluoride with the R 8 Si 8 O 12 POSS…
The use of microporous materials with ordered porous structures as the hosts to encapsulate metal nanoclusters has attracted particular interest in catalysis because the pore size restriction could limit the growth of nanoclusters and lead to an increase in the percentage of the catalytically active surface atoms. Thi…
A fundamental understanding of the role of catalysts in dehydrogenation of MgH(2) nanoclusters is provided by carrying out first-principles calculations based on density functional theory. It is shown that the transition metal atoms Ti, V, Fe, and Ni not only lower desorption energies significantly but also continue t…
Polyvinyl alcohol (PVA) nanofibers and single-walled carbon nanotube (SWNT)/PVA composite nanofibers have been produced by electrospinning. An apparent increase in the PVA crystallinity with a concomitant change in its main crystalline phase and a reduction in the crystalline domain size were observed in the SWNT/PVA…
A new pH and metal ion-responsive BODIPY-based fluorescent probe with an aza crown ether subunit has been synthesized via condensation of 4-(1,4,7,10-tetraoxa-13-aza-cyclopentadec-13-yl)-benzaldehyde with the appropriate 1,3,5,7-tetramethyl substituted boron dipyrromethene moiety. Steady-state and time-resolved fluoro…
Micelles formed from amphiphilic block copolymers have been explored in recent years as carriers for hydrophobic drugs. In an aqueous environment, the hydrophobic blocks form the core of the micelle, which can host lipophilic drugs, while the hydrophilic blocks form the corona or outer shell and stabilize the interfac…
Tausendsassa: Einen Tumor lokalisieren, Wirkstoffe zu diesem transportieren und den therapeutischen Erfolg kontrollieren – all dies vermögen einfache, mit Wirkstoffen beladene superparamagnetische Eisenoxidnanopartikel mit gezielt gewählter Polymerbeschichtung, die sich hoch effizient in einem Tumor anreichern.
We show that colloidal superstructures could be assembled in mixtures of large and small colloidal particles dispersed in a nematic liquid crystal. Using elastic interaction of small colloidal particles with the disclination lines we succeed to demonstrate how one can decorate with small particles a topological matrix…
Conductivity of a disorder-free intrinsic graphene is studied to the first order in the long-range Coulomb interaction and is found to be σ=σ 0 (1+0.01g), where g is the dimensionless ("fine structure") coupling constant. The calculations are performed using three different methods: i) electron polarization function,…
Synchrotron‐based X‐ray diffraction has been used to analyze a series of mechanochemically prepared calcium silicate hydrate (C–S–H) phases with aimed Ca/Si ratios from 1/5 to 3/2. Fumed silica and CaO were used as starting materials. All samples contain 3‐dimensionally ordered C–S–H phases. Pure C–S–H phases are pres…
MgO based magnetic tunnel junctions are prepared to investigate the dielectric breakdown of the tunnel barrier. The breakdown is directly visualized by transmission electron microscopy measurements. The broken tunnel junctions are prepared for the microscopy measurements by focussed ion beam out of the junctions chara…