Materials Literature
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Abstract The uniform structure of cellulose, combined with its hydrophilicity, biocompatibility, chirality, and structure‐forming capacity, as well as its broad synthetic potential, make the design of cellulose‐based advanced materials a challenge for polysac‐charide research. The synthesis of new cellulose products w…
A series of chemically modified porous silicas, which can be used in high-performance liquid chromatography (HPLC), were prepared by a two-step modification process. Aminopropyl groups were first attached to the silica surface and subsequently converted to amides via the reaction with appropriate acid chlorides. Chang…
In this paper, the percolation threshold of the carbon black-resin composites is discussed based on the experimental results of the changes in resistivity and relative permittivity for loading carbon black, the electric field dependence of current, and the critical exponent of conductivity. It was found that a formati…
A series of alternating copolymers of 2,5-(3,4-ethylenedioxy)thiophene and 1,2-vinylene with well defined repeat unit ratios were synthesized and characterized electrochemically and spectroscopically. By increasing the vinylene to thiophene ratio from 0:1 to 0.5:1 to 1:1 along the polymer backbone, the bandgap of the…
MCM-48 mesoporous molecular sieves containing iron(III) were obtained using a direct sol−gel route followed by removal of the cetyltrimethylammonium hydroxide template before calcination. UV−visible, ESR, and XANES spectroscopies show that iron mostly occupies tetrahedral sites of the siliceous walls. The formation of…
Using nanoscale atomistic simulations it has been possible to address the problem of cross slip of a dissociated screw dislocation in an fcc metal (Cu) by a method not suffering from the limitations imposed by elasticity theory. The focus has been on different dislocation configurations relevant for cross slip via the…
The materials science of carbon-based materials has enjoyed a tremendous growth in the past half century. Selected highlights are reviewed with emphasis given to future opportunities in this research field.
This paper investigates sintering and phase transitions of La 0.7 CaxCrO 3 (0.25≥x≥0.35), a material useful as electrical interconnections in solid oxide fuel cells. Heating of the quenched, metastable single‐phase chromite resulted in exsolution of CaCrO 4 due to Ca solubility limitations below 1200°C. A transient li…
▪ Abstract Cholesteric liquid crystals possess a helical structure and exhibit two stable states at zero field: the planar texture and the focal conic texture. In the planar texture, they reflect circularly polarized light, whereas in the focal conic texture, they scatter light in forward directions. They can be switc…
We have studied the adsorption of poly(styrene- b -2-vinylpyridine) block copolymers from a selective solvent onto a flat solid substrate, resulting in the formation of laterally ordered microdomains. We address the question whether the lateral domain structure is due to adsorption of entire micelles from the solution…
The hydroxyl or vinyl end-groups of linear or three-arm star-shaped poly(ε-caprolactone) (PCL) chains have been derivatized into triethoxysilane groups reactive in the sol-gel process. New transparent hybrid materials that combine tetraethylorthosilicate (TEOS) and PCL known for biodegradability and biocompatibility h…
Electrochemical methods were used in a systematic investigation of the abilities of the homologous straight chain mono-and α,ω-dicarboxylates to inhibit corrosion of mild steel, copper, and aluminum in aerated, mildly saline, and near-neutral aqueous solutions. Performance of both compound types was shown to be critic…
Molecular diffusion in amorphous solid water is studied by measuring the extent of isotope exchange and mixing in vapor-deposited ultrathin films using temperature-programmed desorption. Our results indicate there is long-range translational diffusion that occurs concomitantly with the amorphous to crystalline ice pha…
Virtually all studies of the protein-folding reaction add either heat, acid, or a chemical denaturant to an aqueous protein solution in order to perturb the protein structure. When chemical denaturants are used, very high concentrations are usually necessary to observe any change in protein structure. In a solution wi…
This paper describes the processing dependence of the mechanical properties of three blends of starch/ethylene vinyl alcohol (EVOH) with potential uses as biomaterials. These blends exhibit a distinct rheological behaviour and mechanical performance. Using shear controlled orientation in injection moulding (Scorim) it…
The temporal evolution of inhomogeneous spectra emitted by dye molecules in the course of their solvation within a supercooled liquid is analyzed, where the average emission energy ν( t ) probes the dielectric relaxation. The observed increase in the optical line width, σ inh ( t ), near the glass transition is compar…
The radiation field for an annular-type photocatalytic reactor has been modeled, and the resulting integro-differential equation has been solved resorting to the discrete ordinate method. The spatial domain was described in terms of two cylindrical coordinates and the field of direction with two angular variables. The…
A Kaolin-filled, high-density polyethylene (HDPE) system was used to illustrate the influence of particulates on modulus and toughness of the bulk material. A variation of filler content, particulate size and coupling quality for two HDPE-matrix systems with different viscosity led to a strong dependency of elastic mo…
The TiO 2 (110) surface, prepared with different densities of anion vacancy defect sites, has been investigated by studies of O 2 photodesorption at 105 K. Two separate O 2 photodesorption processes, α 1 and α 2, are detected and are postulated to be due to the presence of two different types of defect sites produced…
Over the past few decades, many new packaging techniques have been introduced in the quest for natural preservation of foods and on-time quality monitoring of packaged food to ensure good product quality and safety for the consumer. This paper discusses scientific, technological, commercial and legislative development…