Materials Literature
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Making films: Ordered aluminosilicate films are grown on a Mo(112) substrate, and their structures are determined through high-resolution experiments and density functional theory calculations. At low Al/Si ratios, aluminum atoms partially replace the silicon atoms of the silica structure. The resulting aluminosilicat…
Wood-fiber reinforced polylactide is a biodegradable composite where both fibers and matrix are from renewable resources. When designing new materials of this kind, it is useful to measure the influence of fiber–matrix interface properties on macroscopic mechanical properties. In particular, a quantitative measure of…
Three humic phenolic monomers, catechol (CAT), caffeic acid (CAFF), and p-coumaric acid (COUM), were subjected to oxidative coupling catalyzed by biomimetic water-soluble iron-porphyrin (Fe(TDCPPS)CI) in either separate or mixed solution, and the reaction products were characterized by gas chromatography-mass spectrom…
We consider a liquid interface with different principal curvatures +/-c and find that the mere presence of a spherical particle leads to a deformation field of quadrupolar symmetry; the corresponding "capillary quadrupole moment" is given by the ratio of the particle size and the curvature radius. The resulting pair i…
Der bessere Weg: Mit dem hier vorgestellten Vermahlen in Substanz und mit Flüssigkeitsunterstützung werden Dreikomponentenfeststoffe erhalten. Eine Vielzahl an festen oder flüssigen Gästen wird in ein Coffein/Bernsteinsäure-Wirtgerüst eingelagert. Diese Vermahl-Methoden sind der Kristallisation aus Lösung für das Scre…
The surface electroinitiated emulsion polymerization (SEEP) protocol, described here for the first time, combines the advantages of the electrografting process, which delivers thin organic coatings chemically bonded to conducting surfaces, with polymerization in emulsion, which allows synthesizing hydrophobic polymers…
Abstract A new aromatic, unsymmetrical ether diamine with a trifluoromethyl pendent group, 1,4‐(2′‐trifluoromethyl‐4′,4″‐diaminodiphenoxy)benzene, was successfully synthesized in three steps with hydroquinone as a starting material and polymerized with various aromatic tetracarboxylic acid dianhydrides, including 4,4′…
Transition metal doped III-V, II-VI, and group IV compounds offer an unprecedented opportunity to explore ferromagnetism in semiconductors. Because ferromagnetic spin-spin interactions are mediated by holes in the valence band, changing the Fermi level using co-doping, electric fields, or light can directly manipulate…
The present investigation describes the synthesis and characterization of novel biodegradable nanoparticles based on chitosan. Poly(ethylene glycol) dicarboxylic acid was used for intramolecular cross-linking of the chitosan linear chains. The condensation reaction of carboxylic groups and pendant amino groups of chit…
Big is beautiful: A folded synthetic molecule with a conformation that compares in size with the tertiary folds of a small protein and yet only consist of non-natural units is described. By not controlling the helical handedness allows the effect of tertiary interactions between helical modules through helix–helix sid…
The antibacterial activity of ciprofloxacin-encapsulated silica nanoshells synthesized from gold@silica core-shell nanoparticles has been investigated. The minimum inhibitory concentration of the material was found using the agar dilution method, and it showed better antibacterial activity compared to free ciprofloxac…
Bacterial transport of many sugars, coupled to their phosphorylation, is carried out by the phosphoenolpyruvate (PEP):sugar phosphotransferase system and involves five phosphoryl group transfer reactions. Sugar translocation initiates with the Mg(2+)-dependent phosphorylation of enzyme I (EI) by PEP. Crystals of Esche…
Electron paramagnetic resonance (EPR) studies of a ${\mathrm{Ni}}_{4}$ single-molecule magnet (SMM) yield the zero-field-splitting (ZFS) parameters $D$, ${B}_{4}^{0}$, and ${B}_{4}^{4}$, based on the giant spin approximation (GSA) with $S=4$; ${B}_{4}^{4}$ is responsible for the magnetization tunneling in this SMM. Ex…
Electronic structure of boron-nitride nanotubes (BNNTs) can be tuned in a wide range through covalent functionalization, as experimentally and theoretically evidenced. Various functional groups were covalently attached to BNNTs. The ultraviolet-visible absorption spectra indicate that the electronic structure of BNNTs…
The synthesis of peptide−polymer conjugates comprising ( d - alt - l )-cyclopeptides as aggregator domains and their self-assembly into tubelike structures is described. By coupling two well-defined poly( n -butyl acrylate) blocks to opposite sides of a preformed cyclic ( d - alt - l )-α-octapeptide, a coil−ring−coil…
Effects of the structure of an alkoxysilane on the early reaction kinetics of sol-gel polymerization are investigated in basic and acidic conditions. Six silanes, including tetraethoxysilane (TEOS), tetramethoxysilane (TMOS), methyltrimethoxysilane (MTMS), bis(trimethoxysilyl)ethane (BTMSE), bis(trimethoxysilyl)hexane…
The second hyperpolarizability $γ_N(-3ωω,ω,ω)$ of $N$ double-bond finite chain of trans-polyactylene is analyzed using the Su-Schrieffer-Heeger model to explain qualitative features of the size-dependence behavior of $γ_N$. Our study shows that $γ_N/N$ is {\it nonmonotonic} with $N$ and that the nonmonotonicity is cau…
Abstract An amine‐terminated hyperbranched polyimide (HBPI) was prepared by the condensation polymerization of a commercially available triamine monomer with a dianhydride monomer. The effects of the HBPI content on the thermal and mechanical interfacial properties of diglycidyl ether of bisphenol A (DGEBA) epoxy resi…
Abstract A Brabender mixer was used to deagglomerate and disperse organomodified montmorillonite Cloisite® 30B (3 wt %) in polylactide (PLA) matrix to obtain nanocomposite systems. The influence of compounding conditions such as blending time (6.5, 10, 20, and 30 min) and compression molding on the nanostructure of na…
We show a novel magneto-resistive effect that appears in lithographically shaped, three-arm nanostructure, fabricated from ferromagnetic (Ga,Mn)As layers. The effect, related to a rearrangement of magnetic domain walls between different pairs of arms in the structure, reveals as a dependence of zero-field resistance o…