Materials Literature
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Thermotropic ionic liquid crystals with a pyridinium skeleton were synthesized and the effects of counter ions for the liquid crystal formation were examined. The liquid crystal formation depended on the counter anions. The pyridinium liquid crystal, having chloride counter ion, showed columnar, cubic, and smectic A p…
A electrospinning process to prepare soft tissue engineering scaffold was introduced in this study. This kind of scaffold was composed with ultrathin fiber and characterized with high porosity, well-interconnected pores and high surface-to-volume ratio. Biodegradable polylaticacid (PLA) was used to spin the scaffold a…
A novel tartaric acid modified fatty amide diol (TAFA) was synthesized through the condensation polymerization of N,N‐bis(2‐hydroxy ethyl) linseed oil fatty amide and tartaric acid (TA).The structural elucidation of the TAFA resin was carried out by FT‐IR,1H‐NMR, and 13C‐NMR spectroscopic techniques. The physico‐mecha…
Abstract Structural characterisation of hexamine cage complexes, two containing diamagnetic Co III and one containing paramagnetic Cu II , to which both rather short (C 4 ) and relatively long (C 13 ) alkyl substituents have been attached, shows that while the longer “tail” introduces an anticipated bilayer form to th…
An analytic expression for the electromagnetic enhancement of the spontaneous emission rate and Raman scattering cross-section for an excited atom or molecule in close proximity to a metal nanocylinder has been derived by quantum theory. Coupling of the atomic or molecular optical radiation into the TM0 surface plasmo…
We have extensively measured the resistance of NbSe 3 near critical pressure ( P 1 = 3.2 GPa) for the upper charge-density-wave ( T 1 -CDW) phase. We reveal that the T 1 -CDW coexists with the superconducting (SC) phase between 2.0 GPa and 2.9 GPa. Near P 1 on the T 1 -CDW side, the T 1 -CDW transition temperature app…
Abstract A metal–semiconductor–metal photoconductive detector has been fabricated from porous silicon. To that aim low conductive p‐type Si (20 Ω cm) has been porosified and several rapid‐thermal treatment steps applied before deposition of Al‐contacts. The photo response was investigated in the wavelength range of 35…
Polyethylene nanofibers were synthesized by heterogeneous Ziegler-Natta polymerization inside nanochannels of robust anodized aluminum oxide (AAO) membranes. The polymerization catalysts were chemisorbed at the inner wall of the nanochannels and monomers were provided through diffusion from the outside. Polyethylene i…
Polypropylene has been blended with ethylene-propylene-diene monomer (EPDM), low-density polyethylene (LDPE), and ethylene-vinyl acetate (EVA) copolymer and their combinations. The obtained films have been subjected to thermal and UV weathering. The relative change in the carbonyl index as a result of thermal and UV a…
Bulk and physica l properti es of need le-punched nonwoven fabri c depend on the nature of component fibre, the manner in whi ch the fibres arc arranged in the struc ture and the degree of co nsolidation . A proper understanding of th.:. role of differe nt parameters on fabr ic properties is important l'o r des igning…
A new method has been developed for determining the main laws of the deformation of soft soils under conditions of dynamic loading with amplitudes of up to several gigapascals. The method is based on the results of high-strain-rate tests under uniaxial deformation conditions, which were obtained using a modified Kolsk…
Qualification tests with respect to stress corrosion cracking and sulphide stress corrosion cracking of welded pipeline for oil and gas transmission are often based on four-point bend testing. However, there are no reliable standards or guidelines that account for the range of variables that may affect the results, in…
The eight weavable singles yarns studied in Part 1 of this paper were all woven plain weave and the end breaks identified by cause and recorded. End breaks were found to be due to failed splices, abrasion failure and thin places. The incidence of thin-place breaks was found to increase with increasing irregularity (CV…
We present a systematic study of porous silicon photoluminescence quenching in the presence of precisely controlled amounts of linear aliphatic alcohols (from methanol to hexanol) in gas and liquid phases. From the concentration dependence of photoluminescence quenching response we determined sensitivity of porous sil…
Abstract Since the introduction of the ZIRLO™ alloy for use in commercial nuclear light water reactors (LWRs) in the early nineties, work has continued on identifying chemistry and process changes to improve further the in-reactor corrosion performance of the alloy. Relative to the reference ZIRLO chemistry of Zr-1%Nb…
The infrared (IR) spectra of cuboidic titanium carbide (TiC) nanocrystals have been studied at the density-functional-theory (DFT) level using the Becke-Perdew (BP) functional and triple-zeta quality basis sets augmented by one set of polarization functions (TZVP). The accuracy of the calculations was checked by DFT c…
Water‐soluble chitin (half‐deacetylated chitin) was prepared from chitosan by N‐acetylation with acetic anhydride. Alginate/water‐soluble chitin blend fibers were prepared by spinning their mixture solution through a viscose‐type spinneret into a coagulating bath containing aqueous CaCl2 and ethanol. The structure and…
Abstract Surface‐enhanced Raman scattering (SERS) spectroscopy has been successfully extended to transition metal/non‐aqueous electrochemical interfaces recently in our laboratory. Some interesting and new findings are presented with the objective of illustrating the virtues of SERS as a versatile technique to examine…
NaNiO 2 was prepared through oxidation of a Na 2 NiO 2 / NiO mixture (1:1) in dried oxygen at 500 °C. Single crystals have been grown by annealing of NaNiO2 powder at 600 °C for 83 d in a flow of dried oxygen. According to the X-ray analysis of the crystal structure (C2/m, Z = 2, a = 5.3177(2), b = 2.8458(1), c = 5.58…
Abstract A band filter gradient structure was obtained in porous Si by electrochemically etching a rugate structure into a Si wafer using an asymmetrically placed counter electrode. The resulting porous Si film displays a rejection band whose wavelength maximum varies spatially due to the uneven distribution of curren…