Materials Literature
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Ion-promoted, automorphogenic, and stoichiometric self-assembly of a hexameric, Ru-based macrocycle and a dendrimer produces a stable nanofiber. A structurally related larger 3rd generation dendrimer was reacted with [(112+)(PF6−)12] to afford a neutral, sphere-like motif. These polyanionic counterions lead to ion-pai…
We discuss simulations of a simple model for polymer blends in the framework of the Rouse model. At odds with standard predictions, large dynamic asymmetry between the two components induces strong nonexponentiality of the Rouse modes for the fast component. Despite chains being much shorter than the entanglement leng…
In Archaea, acetate formation and ATP synthesis from acetyl-CoA is catalyzed by an unusual ADP-forming acetyl-CoA synthetase (ACD) (acetyl-CoA + ADP + P(i) acetate + ATP + HS-CoA) catalyzing the formation of acetate from acetyl-CoA and concomitant ATP synthesis by the mechanism of substrate level phosphorylation. ACD…
Biological passivation of porous silicon (PSi)-based optical devices is demonstrated. Infiltration by small amphiphilic fungal proteins called HFBs changes the wettability of the PSi surface (see figure) and protects the sponge-like structure against dissolution by basic solutions. This protein membrane leaves the sen…
Based on perturbation theory and local-density-functional calculations, we study the effect of atomic-scale defects, whose potentials vary on the scale of interatomic distance, on the electronic structure of graphene in the region of low energies. If defects are identical, for example, vacancies at the same sublattice…
Polymers represent the largest and versatile class of biomaterials being extensively applied in multitude of biomedical applications. This versatility is attributed to the relative ease with which polymers can be designed and prepared with a wide variety of structures and appropriate physical, chemical, surface and bi…
Abstract Silica‐reinforced natural rubber (NR) composite was prepared by using tetraethoxysilane (TEOS) as a precursor to generate silica particles inside the rubber. The silica was generated in situ by the sol–gel process of TEOS that was mixed directly into commercial‐graded NR latex having 60% dry rubber content an…
The magnetization reversal mechanism in pulsed laser deposited, hard magnetic epitaxial $\mathrm{Sm}{\mathrm{Co}}_{5}$ thin films with high coercivity $(>3\phantom{\rule{0.3em}{0ex}}\mathrm{T})$ and remanent polarization $(0.94\phantom{\rule{0.3em}{0ex}}\mathrm{T})$ is investigated. From temperature and angle depen…
Multifunctional materials such as mag netoelect rics can be used in novel device applications. Magnetism and ferroelectricity coexist in some materials, but the coupling between them is very small to use them in devices. Using density function al calculations we have shown that BiCoO3 (see figure) has large magneto-el…
We evaluate explicit atom, united atom, and coarse-grained force fields for molecular dynamics simulation of poly(methyl methacrylate) (PMMA) by comparison to structural and dynamic neutron scattering data. The coarse-grained force field is assigned based on output of the united atom simulation, for which we use an ex…
The recycling process of polypropylene (PP) and the elaboration of recycled polypropylene/modified clay nanocomposite by melt intercalation method have been investigated. The purpose of this work is to characterize the influence of the recycle processing of an homopolypropylene on the mechanical, thermal, and rheologi…
Proximity of fluorescent molecules to noble metal nanoparticles leads to a strong enhancement of the fluorescent intensity during irradiation with light, a consequence of resonant coupling to localized particle plasmons. In this communication we show that the substrate can have a profound effect on this simple picture…
Abstract A novel polyhedral oligomeric silsesquioxane (POSS) containing a mercaptopropyl group [mercaptopropyl polyhedral oligomeric silsesquioxane (MPOSS)] was synthesized via the hydrolytic condensation of γ‐mercaptopropyl triethoxysilane in an ethanol solution catalyzed by concentrated hydrochloric acid and was use…
We report on a study of the influence of a magnetic field on the nematic phase and the isotropic-to-nematic (IN) phase transition of hard colloidal gibbsite platelets. We find direct visual evidence of a shift of the IN transition to lower concentrations due to the magnetic field. The nematic phase readily aligns when…
Powders of roller quenched (Sr,Ba)O·Al2O3·2SiO2 glasses of various compositions were uniaxially pressed into bars and hot isostatically pressed at 1350°C for 4 h or cold isostatically pressed and sintered at different temperatures between 800° to 1500°C for 10 or 20 h. Densities, flexural strengths, and linear thermal…
A preliminary study was made on the antibacterial mechanism of copper-bearing antibacterial stainless steels against E.coli through experiments of microbiology such as EDTA (ethylenediaminetetraacetic acid) complexing, DNA smearing and AFM (atomic force microscope) observation. It was measured that the antibacterial s…
We have synthesized a new type of acyclic bis(N2O2 chelate) ligand that affords a C-shaped O6 site by the metalation of the N2O2 salamo sites. UV-vis titration clearly showed that complexation of H4L with MII (MnII, CoII, and NiII) affords the 1:3 complex [LM3]2+ in a cooperative fashion, whereas complexation with cop…
Abstract The electrical properties of banana fiber‐reinforced phenol formaldehyde composites have been studied with special reference to fiber loading, fiber treatments, and hybridization with glass fibers. The dielectric constant decreased with frequency and fiber loading. Treatments with silanes, NaOH and acetylatio…
Ab initio perturbation-theory techniques, such as the generalized perturbation method and magnetic force theorem, are used to determine the Heisenberg exchange interaction parameters and the effective cluster interactions in Fe-rich bcc Fe-Cr alloys in different magnetic states. We establish a direct connection betwee…
A pi-extended, redox-active tetradentate tetrathiafulvalene-fused salphen [salphen = N,N'-phenylenebis(salicylideneimine)] compound (L) was prepared via a direct Schiff-base condensation of the corresponding diamine-tetrathiafulvalene (TTF) precursor with salicylaldehyde. Its chelating coordination ability has been de…