Materials Literature
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Abstract The properties of melamine based supramolecular compounds have been studied with rheological, thermal, mechanical, dielectric and scattering techniques and compared with similar covalently bonded materials. The complexes are based on a linear pTHF‐diol ( M n = 1 000) connected via a diisocyanate with melamine…
Solubility parameters are introduced for the first time to investigate the solubility problem of liquid crystals. Using Fedors method that is used for polymers and organic solvent gives solubility parameters of liquid crystals in the range of 8.0 (cal/cm 3 ) 1/2 to 11.0 (cal/cm 3 ) 1/2 . Polar liquid crystal compounds…
Incorporation of acenaphtho[1,2-c]pyrrole units into the π-conjugated systems is very effective to get the narrow HOMO-LUMO gap materials, and the absorption spectra of π-conjugated polymers, porphyrins, and boron dipyrromethene dyes fused with acenaphthene rings are extensively red-shifted.The reaction of nitroalkene…
A new series of laterally substituted terphenyl compounds, 4,4"-dialkoxy-2'-methyl-p-terphenyls (n=1 m 12), were synthesized. Their liquid crystallinities were characterized by means of polarizing optical microscopy (POM), differential scanning calorimetry (DSC), and X-ray diffraction (XRD). The influence of the lengt…
Argentina, a large country with an important agriculture industry, needs an ever-increasing amount of phosphorus and potassium, as essential elements for plant growth. Current requirements are met from imports, but potential resources exist in Argentina. For example, several phosphatic occurrences are known in paleo-m…
A novel heteronuclear complex, [CoCe(CH2C(CH3)COO)5(phen)(C2H5OH)]2 (where phen=1,10-phenanthroline), has been prepared and its structure determined by X-ray diffraction methods. The complex crystallizes in the triclinic system with space group P&1macr;, a=12.0982(8), b=12.6068(9), c=14.4492(10)Å, α=67.388(1), β=70.81…
Porphyrins are promising chromophores for the investigation of the still unexplored area of 3-dimensional structural studies of proteins by using the exciton coupled circular dichroism (CD) method. The synthesis, conformational characterization by FTIR absorption and (1)H-NMR, and CD properties are described for a mod…
The martensitic transformation and shape memory (SM) effect in Co-Al alloys containing 0–16 at%Al were investigated by differential scanning calorimetry (DSC) and bending tests. It was found that the martensitic transformation temperatures decrease and the thermal hystereses increase with increasing Al content. It was…
This study describes a highly efficient method for encapsulating protein drugs into liposomes without using toxic solvents such as chloroform. Large unilamellar vesicles (LUVs) were formed by the ethanol injection method. The effects of composition of phospholipid, buffer concentration, incubation time, incubation tem…
A new azobenzene-containing gelator for liquid crystals, AG2, was synthesized and used to prepare a ferroelectric liquid crystal (FLC) gel. The FLC gel shows interesting features. On cooling from the isotropic phase into the N* phase, the dissolved AG2 acts as a chiral dopant and has a compensation effect on the helic…
During cooling of reduced soda-lime-silica glass melts, doped with iron oxides and sulphur species, ferrous iron (Fe2+) reacts with sulphite (SO3 2-), and the Fe3+ (ferric iron) and also the S2- (sulphide) concentration will increase. The sulphite concentration in the amber glass melt after fining is sufficient to pro…
Both ac and dc conductivities of nanocrystalline ZnO ceramics with grain size of ∼40 nm were measured as a function of oxygen partial pressure and temperature, and compared with coarsened microcrystalline samples (grain size of ∼5 μm). Nanocrystalline ceramics showed intrinsic bulk properties which turned into extrins…
A non-optimised treatment of wastewaters containing organic and biological substances is very often accompanied by an accidental emanation of hydrogen sulphide H2S and therefore leads (i) to an undesirable odour in the vicinity of water treatment plants, and (ii) to a potential hazard for the neighbouring population.…
Multi-layer stack accumulative roll bonding (ARB) process is proposed and applied to commercial purity aluminum for ultra grain refinement. The six aluminum sheets 0.5 mm thick, 50 mm wide and 400 mm long were degreased and wire-brushed. The sheets were stacked together, and cold-roll-bonded by 50%-reduction rolling.…
Space-mapping (SM) technique is applied for design optimization of antireflection (AR) coatings for photonic devices such as the semiconductor optical amplifiers (SOA). The approximate and efficient transfer matrix method (TMM) serves as the coarse model for design optimization, whereas the time-intensive and accurate…
We have developed a new manufacturing process for nickel-free austenitic stainless steel. In combination with machining and a nitrogen absorption treatment, this process makes it possible to form small precise devices. However, the temperature for the nitrogen absorption, 1473 K, was sufficiently high for grain growth…
An article written in Japanese in 1979 recorded the reexamination of the Pasteur's experiment on spontaneous resolution and many useful sketches of the hemihedral crystals of sodium ammonium tartrate.
The behavior of ferroelectric liquid crystals in an external electric field is simulated numerically. The equations that describe the dynamics of the director of a liquid crystal are derived within the continuum theory of elasticity with due regard for compressibility of smectic layers, finite anchoring energy, and di…
Dispersion analysis was performed on Fourier transform infrared transmission spectra taken on thermally grown SiO 2 films on Si(100) substrates at 950°C in dry oxygen with thicknesses between 14 and 100 nm. It was found that within the range 900 1400 cm − 1 , these spectra were best described by four Lorentzian osci…
Abstract A new class of phenalenyl‐based neutral radical molecular conductors has recently been reported; a distinctive feature of these molecular solids is the absence of the well‐defined conducting pathway(s) that are characteristic of the organic charge‐transfer salts. These radicals do not stack in the solid state…