Materials Literature
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Single-walled and multiple-walled carbon nanotubes were functionalized with a polystyrene copolymer, poly(styrene- co - p -(4-(4‘-vinylphenyl)-3-oxabutanol)). The functionalization reaction conditions were designed for the esterification of the nanotube-bound carboxylic acids. The polymer-attached carbon nanotubes are…
The aim of this paper is to define optimal conditions for the extraction of chitin from shrimp shells. The kinetics of both demineralization and deproteinization with, in the latter case, the role of temperature are studied. The characterization of the residual calcium and protein contents, the molecular weights, and…
Abstract An AB 2 monomer, 1‐(2‐hydroxyethoxy)‐3,5‐bis‐(methoxymethyl)‐2,4,6‐trimethylbenzene, was synthesized from mesitol and melt‐polycondensed in the presence of an acid catalyst via a transetherification process at 145–150 °C to yield a soluble, moderately high molecular weight hyperbranched polyether. The degree…
Two novel high nuclearity copper(I) alkynyl complexes, [Cu16(hfac)8(CCBut)8] (1) and [Cu20(hfac)8(CCCH2Ph)12] (2), that consist of complicated alkynyl bridged Cu(I) cores ‘capped’ by peripheral hfac ligands have been synthesised and characterised by X-ray structure determination. The photoluminescent properties of 1 a…
Dendron rod–coil molecules (DRCs) spontaneously assemble into birefringent gel-forming networks when added to styrene in small amounts. It is shown that DRC gel derived polystyrene (PS) has greater birefringence than the PS homopolymer when drawn under similar conditions.The dispersed DRC nanophase is responsible for…
A hypothesis was developed, and successfully tested, to greatly increase the rates of biodegradation of polyolefins, by anchoring minute quantities of glucose, sucrose or lactose, onto functionalized polystyrene (polystyrene-co-maleic anhydride copolymer) and measuring their rates of biodegradation, which were found t…
Poly(ethylene oxide)-b-poly(methyl acrylate) diblock copolymer (EOmMAn) prepared via an atom transfer radical polymerization (ATRP) approach was used as a template to synthesize Ia3d mesostructured silica with thick walls under acidic conditions.
Linear and nonlinear optical constants of pulsed laser deposited (PLD) arsenic sulfide films are presented. It is shown that these constants are generally in good agreement with the results for films obtained by other deposition methods. Effects of annealing and exposure on optical constants of these films are investi…
In this study, the production of Poly-b-hydroxybutyrate (PHB) was determined in 1 Rhizobium japonicum, 6 Rhizobium cicer, 8 Rhizobium spp. and Bradyrhizobium japonicum USDA 110. The content of according to dry cell weight was determined to be 1.38-40.0%. In our study, Rhizobium spp. 2426, which produced the highest pe…
The static dielectric properties of (001)(GaAs)(p)/(AlAs)(p) superlattices have been calculated as a function of their period p for 1< or = p < or =12, starting from density-functional theory. The interplay between quantum confinement and local field effects is shown to be crucial. For light polarized in the growth di…
An zwei unterschiedlichen Positionen derivatisierbar sind die neuartigen Heteropolymolybdate wie das gezeigte [SeIVMo6O21(O2CCH2NH3)3]2−. Zudem eröffnen die terminalen Aminogruppen der Aminosäuren weitere Funktionalisierungsmöglichkeiten, sodass die hier vorgestellten 18 Verbindungen ideale Kandidaten für das Wirkstof…
Rare earth ion-exchanged zeolites exhibit a tremendous enhancement of luminescence upon treatment with suitable organic complexing agents, as reported here. For Eu3+ exchanged zeolite X, the β-diketone 1-thienyl-4,4,4-trifluoro-1,3-butane-1,3-dione leads to the formation of intra-zeolite complexes. Fully coordinated c…
Negative thermal expansion (NTE) in cubic ${\mathrm{Z}\mathrm{r}\mathrm{W}}_{2}{\mathrm{O}}_{8}$ has generated much interest due to its large, isotropic, and temperature independent behavior. Here, x-ray absorption fine structure data are presented for various atom pairs, providing evidence that the low-energy modes c…
The three-coordinate iron(II) complex, (But-BDI)FeOBut [But-BDI = HC(C(But)N-2,6-iPr2C6H3)2] is found to be a highly active initiator for the polymerisation of lactide and caprolactone at room temperature.
The copolymerization of aryl bis- and tris-trifluorovinyl ether monomers yields aromatic perfluorocyclobutyl (PFCB) polymers, via thermally initiated step-growth cycloaddition chemistry. PFCB polymers and their copolymers enjoy a unique combination of attributes well suited for applications in photonic technologies, s…
Homogeneous magnetic nanoparticles can be synthesised within the constrained volume architecture of Listeria innocua (see Figure). This ferritin-like protein cage provides a limited reaction environment for the synthesis of 5 nm diameter ferrimagnetic iron oxide maghemite nanoparticles. The results suggest a new gener…
Micellization is the precipitation of lipids from aqueous solution into aggregates with a broad distribution of aggregation number. Three eras of micellization are characterized in a simple kinetic model of Becker-Döring type. The model asigns the same constant energy to the $(k-1)$ monomer-monomer bonds in a linear c…
The length of the arms of a nanorod-based architecture can be adjusted from 100 nm up to a micrometer (see Figure) when using the simple one step surfactant-ligand co-assisted solvothermal technique reported here. The arm lengths are controlled by simply changing the relative concentrations of dodecylthiol and ethylen…
Injecting charge into dangling bond wires on Si(001) has been shown to induce polarons, which are weakly coupled to the underlying bulk phonons. We present elevated temperature tight binding molecular dynamics simulations designed to obtain a diffusion barrier for the diffusive motion of these polarons. The results in…
A new $\mathrm{N}\mathrm{H}\mathrm{\ensuremath{\cdots}}\mathrm{N}$ hydrogen-bonded ferroelectric crystal of $[{\mathrm{C}}_{\mathrm{6}}{\mathrm{H}}_{\mathrm{12}}{\mathrm{N}}_{\mathrm{2}}\mathrm{H}{\mathrm{]}}^{\mathrm{+}}\mathrm{R}\mathrm{e}{\mathrm{O}}_{\mathrm{4}}^{\mathrm{\ensuremath{-}}}$ ($\mathrm{d}\mathrm{a}\ma…