Materials Literature
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Abstract The rheological investigation of concentrated solutions of aliphatic hyperbranched polyesters (AHBP) in N ‐methyl‐2‐pyrrolidinon (NMP) is presented. Two series of hydroxy‐functional AHBP were synthesized using pseudo‐one‐step and one‐step procedure. Three commercial (Boltorn®) AHBP were also investigated. In…
Abstract Doping of diamond using multi‐component, multi‐species structures has been modelled using density functional methods. We find that few combinations of impurities yield donor levels shallower than phosphorus. Complexes involving impurities from the second or lower rows of the periodic table are unbound, and th…
We present an interpretation that differs from an accepted explanation for resonance excitation of surface plasmons (SPs) on a metal using an attenuated total reflection (ATR) method. The metal ATR phenomenon is well expressed in terms of wave optics and accompanies an enhanced evanescent field. The ATR curves and the…
Abstract Hydrogen in a variety of forms (molecular hydrogen, atomic hydrogen, hydrocarbon radicals) is involved in diamond formation. The present work studies the incorporation of hydrogen and its bonding configuration in diamond films composed of diamond grains of varying size which were deposited by three different…
A new supramolecular system, liquid-crystalline polyrotaxane (LCPR), has been recently prepared by introduction of 4-cyano-4'- n -pentylbiphenyl (5CB) groups to the cyclic molecules of a polyrotaxane (PR) consisting of polyethylene glycol (PEG) and α-cyclodextrin (α-CD). Here we measured and compared the dielectric re…
High-resolution 2p photoionization and subsequent Auger decay of atomic Al have been investigated both experimentally and theoretically. Fine-structure-resolved experimental main and satellite photoelectron spectra were reproduced using extensive relativistic multiconfiguration Dirac–Fock calculations. Emphasis was pl…
Abstract The co‐assembly between a polyisoprene‐ block ‐poly(dimethylaminoethyl methacrylate) block copolymer and poly(ureamethylvinyl)silazane is investigated. The hybrid morphology can be controlled by systematically increasing the inorganic‐to‐organic ratio or by changing the molecular weight of the block copolymer…
Wide-angle X-ray scattering, molecular dynamics (MD) simulations, and integral equation theory are used to study the structure of poly(diethylsiloxane) (PDES), poly(ethylmethylsiloxane) (PEMS), and poly(dimethylsiloxane) (PDMS) melts. The structure functions of PDES, PEMS, and PDMS are similar, but systematic trends i…
Abstract We synthesized a series of polystyrene derivatives containing coumarin side groups using polymer analogous reactions. The liquid‐crystal (LC) alignment director for these polymer films was found to be perpendicular to the rubbing direction. The contrast ratio and anchoring‐energy values of these polystyrene d…
We explore the origin of ferromagnetism in $\mathrm{Cu}{\mathrm{Cr}}_{2}{\mathrm{S}}_{4}$ and $\mathrm{Cu}{\mathrm{Cr}}_{2}{\mathrm{Se}}_{4}$ by analyzing the computed, ab initio electronic structure. Based on our analysis, we establish the kinetic-energy driven mechanism as operative in the case of double perovskites…
A hetero-bifunctional gelator composed of two different polymerizable groups, acryl and diacetylene, and used to gelate an acrylic monomer has been prepared. The photopolymerization of the organogel formed in hexyl methacrylate produces a free-standing film, in which fluorescent polydiacetylene nanofibers are embedded…
This study deals with the grafting of carbohydrate monomers on poly(ethylene terephthalate) fibers by double argon plasma treatment. Two monomers were used: allyl alpha-D-galactopyranoside and 2-methacryloxyethyl glucoside. The quantity of grafted carbohydrates was determined by phenol/sulfuric acid colorimetric titra…
Amorphous microporous silica (AMS) materials with variation in microporosity were prepared using an acid-catalyzed sol−gel procedure departing from tetraethylorthosilicate. The silicas were fined to specific particle sizes by crushing and sieving. AMS materials were loaded with 10 wt % ibuprofen either by uptake of mo…
Abstract Clays used in polymer‐layered silicate nanocomposites are heterogeneous. To improve insight into structure and dynamics of the interface, the iron‐free and structurally homogeneous layered silicate magadiite was synthesized. Morphology of the magadiite and the extent of intercalation in melt‐prepared composit…
Abstract The effects of different processes of hydrogenation, thermal treatment and ion irradiation of hydrogenated polycrystalline diamond surface have been investigated by means of high resolution electron energy loss spectroscopy (HR‐EELS). Analysis of the different contributions in the CH stretching, overtones and…
Abstract Recent experiments have shown that vacancy clusters are common defects in all types of monocrystalline brown diamond. This is believed to be due to an enhanced stability of the bounding 〈111〉 or 〈110〉 surfaces, arising from the formation of π‐bonded chains. These chains lead to broad bands of gap states with…
We discuss equilibrium properties of classical fluids confined to nanoscopic volumes by solid substrates. The substrates themselves are endowed with wettable chemical patterns of variable symmetry. We develop a thermodynamic description suitable for these highly anisotropic systems. Based upon a combination of Monte C…
Novel bulky esters of cellulose were synthesized homogeneously, applying the solvent systems DMA/LiCl or DMSO/TBAF, by conversion of the biopolymer with aryl polyester dendrons. The carboxylic acid moieties were efficiently activated in situ with CDI or the acid chloride was applied. Cellulose esters with DS values of…
In this research, the thermodynamics of H2 solution and hydride formation in a series of disordered Pd-Ag alloys has been determined using both reaction calorimetry and equilibrium PH2-composition-T data. Trends of DeltaHH and DeltaSH with both H and Ag concentration have been determined. For the Pd0.76Ag0.24 alloy, w…
We investigated systematically the structure and growth of monolayers of physisorbed polybutadiene (PB) starlike polymers on freshly cleaved mica after solvent evaporation using atomic force microscopy (AFM). We observed a strong dependence of the evolution of the average island height and surface coverage with increa…