Materials Literature
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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…
A direct process for preparing contiguous gold shells (15-25 nm thick) over amorphous silica spheres (200 nm) is described. In this method, gold seeds are synthesized from HAuCl(4) in a dilute NaOH solution using deposition-precipitation with subsequent metallization by sodium borohydride (NaBH(4)). The ease of disper…
Nanoconjugates are emerging as promising drug-delivery vehicles because of their multimodular structure enabling them to actively target discrete cells, pass through biological barriers and simultaneously carry multiple drugs of various chemical nature. Nanoconjugates have matured from simple devices to multifunctiona…
The valence states of transition metals were studied by measuring the x-ray absorption spectra at both $\mathrm{Mn}\phantom{\rule{0.2em}{0ex}}{L}_{2,3}$ and $\mathrm{Co}\phantom{\rule{0.2em}{0ex}}{L}_{2,3}$ edges of partially $B$-site-disordered perovskite $\mathrm{Eu}{\mathrm{Mn}}_{0.5}{\mathrm{Co}}_{0.5}{\mathrm{O}}…
Abstract A novel method for the shape‐controlled synthesis of uniformly‐shaped poly( p ‐phenylenediamine) (P p PD) microparticles with different morphologies under ambient condition has been developed using HAuCl 4 as an oxidant and poly( N ‐vinylpyrrolidone) (PVP) as a surfactant. The results demonstrate that the mor…
Two strategies have been explored for organic functionalizations of ZnO nanotetrapods via anchoring groups of carboxylate and phosphonate. With these methods, oleyl chains were assembled on the surfaces of the ZnO nanotetrapods, significantly enhancing their solubility in nonpolar solvents, such as chloroform and tolu…
Soft colloidal interactions in colloidal glasses are modeled using suspensions of multiarm star polymers. Using a preshearing protocol that ensures a reproducible initial state ("rejuvenation" of the system), we report here the evolution of the flow curve from monotonically increasing to one dominated by a stress plat…