Materials Literature
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Contrary to expectation, we demonstrate that spider dragline silk spun experimentally under water displays greater stiffness and higher resilience compared to silk spun "naturally" into air. We suggest that this consequence of extended wet-spinning is due to increased molecular orientation resulting from extension of…
Beside the high-capacity storage facilities based on hydro-power technologies, electrochemical solutions are the today's candidate for storage for renewable energy sources. However, limited life-cycles and sustainability of batteries are often inhibiting factors. This paper presents a hybrid energy storage system with…
Environmental factors affecting hydrogen absorption into steels have been investigated by hydrogen permeation tests under atmospheric exposure and simulated environmental conditions. Hydrogen absorption into steels under atmospheric exposure depended upon time in day, seasons and exposure locations. It was confirmed t…
Here we describe the first report of a family of fully conjugated monomers bearing salicylidene-aniline (anil) photochromes as pendant functional groups. These monomers are either N-functionalized pyrroles or 2,5-dithienylpyrroles. While the pyrrole monomers are not found to electropolymerize, the 2,5-dithienylpyrrole…
The synthesis, characterization, and mesomorphic properties of a new type of heteronuclear compounds 1a–c and a Pd complex 1d derived from benzoxazole as the core group are reported. These compounds were prepared by the ring closure reaction of 4‐alkoxybenzoic acid 4‐[(4‐alkoxy‐2‐hydroxyphenylimino)methyl]phenyl ester…
The carrier mobility of highly ordered lamellar mesophases was evaluated by a Time-of-Flight (TOF) method for mesogenic 1,4-di(5'-octyl-2'-thienyl)benzene (8-TPT-8) to reveal the fastest drift mobility (0.1 cm(2) V(-1) s(-1) for the lowest temperature mesophase) in calamitic liquid crystals reported to date.
Recently proposed thermoelectric applications of quantum dot superlattices made of different material systems depend crucially on the values of the electrical and thermal conductivities in these nanostructures. We report results of the measurements of Hall mobility and thermal conductivity in a set of quantum dot supe…
Mesoporous high surface area and high crystallinity MO2 (M=Ti, Ce, Zr, and Hf) and their mixed oxides powders were synthesized by a modified sol–gel method using laurylamine hydrochloride, metal alkoxide and acetylacetone. The prepared powders had a crystalline size of about 5–15 nm, a specific surface area of 44–80 m…
Aromatic polyimides (PIs) containing thioether (–S–) or disulfide (–S–S–) groups in their molecular structures were prepared to attain high refractive index (nav) and large thermo-optic coefficient (dnav/dT). These PIs exhibit higher nav than the respective ether (–O–) containing PIs, which is due to the large polariz…
The photophysical properties of 2,7,12,17-tetraphenylporphycene (TPPo) and its palladium(II) (PdTPPo) and copper(II) (CuTPPo) complexes as well as comparisons with those of their porphyrin counterparts are reported. All porphycenes absorb in the red part of the spectrum, but only TPPo shows fluorescence (ΦF = 0.15). T…
One-dimensional polymeric complexes consisting of alternating dicopper(II) and digadolinium(III) units exhibited ferrimagnetic behavior which was ascribable to antiferromagnetic coupling across the oximate N-O bridges between the high-spin homodinuclear units.
A new series of -based oxides of the general formula , where , was prepared by a citrate-nitrate combustion process, and the electrical and thermal properties were evaluated. Electrical conductivity measurements on the sintered samples confirmed that all the compositions underwent a phase transition below with a conco…
SummaryThe potential of chitosan (1%) alone, or in combination with ammonium carbonate (3%) or sodium bicarbonate (2%), to reduce the incidence of anthracnose (Colletotrichum gloeosporioides) on papaya (Carica papaya L.) and maintain quality was investigated during storage at 13.5°C and 95% RH for 14 d, and for 2 d un…
Large, low density silica monoliths with a hierarchical organisation of macro- and periodically arranged mesopores are prepared by a true liquid crystal templating approach of an ethylene glycol-modified silane in the presence of a non-ionic block copolymer surfactant and subsequent drying of the wet gels with organos…
All implantable medical devices (IMDs), including pacemakers, defibrillators, drug infusion pumps, and pain management technology require electrical power. One limitation of implantable biomedical devices is the longevity of the battery source. Currently, the longevity of pacemakers and defibrillators ranges from 5 to…
Low temperature embrittlement, recrystallization embrittlement and radiation embrittlement in tungsten and its alloys are critical issues for use as high heat flux components and high-power density structural materials. In order to establish a process for microstructural control to improve the resistance to such embri…
Fuel cells are often seen as a long-term solution to environmental problems such as CO2 emission associated with transportation. To ensure long-term sustainability and the supply of fuel, new renewable of hydrogen (H2) generator have to be introduced. In this study, Ni-rich AZ91D magnesium alloy ingot, which was consi…
Non-porous organic–silica hybrid solids with a very long-range ordered structure are synthesized by hydrolysis/condensation of bridged organosilanes (EtO)3Si–R–Si(OEt)3 (R = phenylene or biphenylylene) in basic or acidic solutions. The hybrid materials have a lamellar structure in which phenylene and biphenylylene gro…
This paper introduces a plasma reactor for short-time plasma surface modification of polymer powders. This reactor type, the so-called plasma downer reactor (PDR), provides a high reaction rate, which is forced by the high gas velocity and high particle dispersion in the plasma. It combines the advantageous characteri…
High-density, single-crystal, vertically aligned, Al-doped ZnO nanowires with an Al content of 1.05 atom % were synthesized on templates at 550°C. Although introducing Al did not change the physical dimensions of the ZnO nanowires, the lattice constant increased by 0.25% and the optical properties of the ZnO nanowires…