Materials Literature
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Recent advances in the process of using single layers of diblock copolymer micelles for the fabrication of arrays of nanoparticles were highlighted. The technique using a monolayer of diblock copolymer micelles as an effective nanostructured template allowed precise control over the type, size, location, and ordering…
A three-dimensional homometallic complex [Co(5)(mu(3)-OH)(2)(btec)(2)(bpp)](n) is built from the mixed hydroxide/carboxylate bridged cobalt(ii) chains linked by the 1,2,4,5-benzenetetracarboxylate (btec(4-)) anion and 1,3-bis(4-pyridyl)-propane molecule (bpp). Within each chain, two mu(3)-OH-bridged metal triangles co…
SummaryCurrent clinical therapies for traumatic or chronic injuries involving osteochondral tissue result in temporary pain reduction and filling of the defect but with biomechanically inferior repair tissue. Tissue engineering of osteochondral repair tissue using autologous cells and bioactive biomaterials has the po…
A bulk Cu-Zn alloy was multi-directionally forged at 77 K and 300 K to a cumulative strain of ΣΔε=6.0. With increasing strain, the initial grains subdivided gradually to ultrafine grains. Mechanical twins enhanced the grain fragmentation. The formed twins were further subdivided by the other variants of twins. The gra…
We demonstrate broadband optical amplification at 1.3 mum in silicate glass-ceramics containing beta-Ga(2)O(3):Ni(2)+ nanocrystals with 980 nm excitation for the first time. The optical gain efficiency is calculated to be about 0.283 cm(-1) when the excitation power is 1.12 W. The optical gain shows similar wavelength…
Diatoms are good environmental indicators and are often the main component of phytobenthos, one of the key groups of organisms recommended by the Water Framework Directive (W.F.D.) for the assessment of ecological status of surface waters. Although diatoms are regularly used as indicators in rivers and in lakes, less…
This paper describes concentrated discharges on polluted insulators in the laboratory and in the field. The authors have observed the concentrated discharges at the high-voltage laboratories in Stuttgart, Zittau, and Mannheim, Germany, and Wroclaw, Poland. The concentrated discharges were also documented under natural…
Nonaqueous solution routes to metal oxide nanoparticles are a valuable alternative to the well-known aqueous sol-gel processes, offering advantages such as high crystallinity at low temperatures, robust synthesis parameters and avoidance of surfactants in order to control the crystal growth. In the first part of this…
Abstract Molecular systems containing two or more interacting porphyrins show remarkable spectroscopic features that allow for a very sensitive detection of conformational changes on the microscale level by different methods, such as fluorescence and electronic circular dichroism (ECD). Covalent porphyrin-DNA assembli…
A(2)B(2)-type push-pull porphyrins with a strong intramolecular dipole moment have been prepared via Heck and Suzuki coupling reactions as novel materials for use in nonlinear optics (NLO); they display saturable (SA) and reverse saturable absorption (RSA) properties at 532 nm and their nonlinear optical response is c…
The synthesis of new [1,3,4]-oxadiazole-based mesogens with nematic phase behaviour at low temperature is described, and their characterisation by OPM, DSC and XRD is reported.
Widely tunable display pixels are reported. The pixel consists of a subwavelength silicon-nitride/air membrane containing complementary fixed and mobile gratings. By altering the device refractive index profile and symmetry, using MEMS actuation methods, wavelength tuning across ~100 nm per pixel in the visible spectr…
There has been a tremendous research effort in the past few years in colloidal magnetic nanocrystals. New synthetic methods have been developed that enable a wide variety of magnetic materials to be synthesized in nanocrystal form, including ferromagnetic transition metals, intermetallics and metal oxides. These nanoc…
Three series of imines containing fluoroalkyl, polyether, alkyl and alkoxy peripheral chains have been prepared. The phase behaviour of the semiperfluorinated compounds has been investigated by optical polarizing microscopy, differential scanning calorimetry and X-ray scattering. The thermal behaviour of the semiperfl…
The influence of simultaneous heat and moisture diffusion on moisture movement in porous materials, such as cotton, has been known since the late 1940s. Until now this theory has not been applied to the problem of microwave heating in moist materials.
To have a comprehensive understanding of protection and thermal comfort performance of a broad range of protective clothing materials, barrier and air/moisture vapor permeabilities of 36 materials commonly used for personal protective equipment were examined. Samples included nonwoven, woven, microporous membrane, and…
The oxidation of 2,3,6-trimethylphenol with aqueous H2O2 over titanium(IV) grafted on commercial mesoporous silica produces 2,3,5-trimethyl-1,4-benzoquinone, with nearly quantitative yield.
Dense microelectrodes fabricated with well-defined microstructures and geometries using microelectronic fabrication techniques were studied using electrochemical impedance spectroscopy (EIS) to investigate the rate-limiting reaction step(s) for oxygen reduction reaction (ORR) on the (LSM)/ -stabilized (8YSZ) system. A…
Recently, considerable attention has been focused on low-dimensional nanomaterials owing to their unique physical properties and potential applications in sensors, magnetics, electric transportation, optics, and even as building blocks for nanoscale devices. The past couple of decades have witnessed the development on…
The electrochemical synthesis of polypyrrole films on aluminum surfaces from aqueous solutions containing tartaric acid and pyrrole was performed using cyclic voltammetry and galvanostatic techniques. A mechanism that considers a porous aluminum oxide layer growing in parallel with the polymeric film explains the poly…