Materials Literature
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The behaviour of the interfacial surface tension of nematics near the nematic-isotropic phase transition has been investigated by several researchers. However, the observations reported by the various authors appear to be inconsistent. The present work is an attempt to identify the causes of such inconsistencies. A de…
Abstract The influence of short glass fibers (SGF) on the dynamic mechanical properties and microstructure of thermotropic copolyesters based on 1,4‐hydroxybenzoic acid and 2,6‐hydroxynaphthoic acid (denoted B‐N) has been investigated. The mechanical relaxations of the reinforced B‐N/SGF composites were studied under…
Abstract Novel fluoroalky end‐capped oligomers/titanium dioxide nanocomposites were prepared by the hydrolysis of titanium isopropoxide in the presence of fluoroalkyl end‐capped N ‐(1,1‐dimethyl‐3‐oxobutyl)acrylamide oligomer [R F ‐(DOBAA) n ‐R F ], fluoroalkyl end‐capped N , N ‐dimethylacrylamide oligomer [R F ‐(DMAA…
Abstract Chitosan‐ g ‐polycaprolactone copolymers (CPCs) with desired composition proportions were synthesized by carefully controlling the weight ratio of polycaprolactone side chains changing approximately between 45 and 48 wt% so that the obtained CPCs could be further processed via different processing techniques.…
SHMT (serine hydoxymethyltransferase), a type I pyridoxal 5'-phosphate-dependent enzyme, catalyses the conversion of L-serine and THF (tetrahydrofolate) into glycine and 5,10-methylene THF. SHMT also catalyses several THF-independent side reactions such as cleavage of beta-hydroxy amino acids, transamination, racemiza…
This paper described the synthesis and physico-chemical properties of homologous series of 2-oxo-2H-chromen-6-yl 6-alkoxy-naphthalene-2-carboxylate (compounds 1-n). Compounds 1-n show a monotropic nematic (N) phase, where the average of the N-isotropic (I) phase transition temperatures is ca. 140°C. The mesomorphic pr…
Mixed condensation of tetramethylsuccinonitrile and either 2,3-dicyano-5,6-diethylpyrazine, 2,3-dicyanopyridine, or 3,4-pyridinedicarboximide in the presence of nickel chloride forms novel pyrazine-, 2,3-pyridine-, or 3,4-pyridine-ring-fused tetraazachlorin (TAC), tetraazabacteriochlorin (TABC), and tetraazaisobacteri…
Photo-cross-linkable liquid crystalline polymers (PLCPs) comprised of a 4-methoxycinnamoyloxy group connected with a tolane moiety possessing methyl substituents were synthesized in order to investigate the influence of methyl substituents on the thermally enhanced in-plane molecular reorientation of thin films. Diffe…
A hybrid aligned nematic cell (HAN) is often used to measure the sum (e 1 + e 3) of the flexoelectric coefficients e 1 and e 3. However, a HAN cell has the difficulty of an internal offset voltage (internal bias) caused by the homeotropic alignment. We present a method to determine the internal bias and then take it i…
Diamondlike carbon (DLC) coatings, particularly in the hydrogenated form, provide extremely low coefficients of friction in concentrated contacts. The objective of this investigation was to evaluate the performance of DLC coatings for potential application in foil bearings. Since in some applications the bearings expe…
The magnetic properties of the Gd(12)O(18) cluster cut from the bulk Gd(2)O(3) crystal are investigated using the spin-polarized density functional theory within the broken-symmetry approach. Our work reveals that in the ground state of the cluster the antiferromagnetic coupling between adjacent Gd (4f(7)) spins is pr…
The notion of designs in Grassmannian spaces was introduced by the author and R. Coulangeon, G. Nebe, in [3]. After having recalled some basic properties of these objects and the connections with the theory of lattices, we prove that the sequence of Barnes-Wall lattices hold <mml:math xmlns:mml="http://www.w3.org/1998…
La 2 Sn 2 O 7:Eu 3+ micronanospheres were prepared by a simple and facile hydrothermal synthesis method. Well-crystallized and phase-pure La 2 Sn 2 O 7:Eu 3+ solid micronanospheres of ∼400 nm in size can be readily obtained after calcination at 900 °C for 3 h. The prepared samples were systematically characterized by…
This study evaluates the influence of particle size, PEGylation, and surface coating on the quantitative biodistribution of near-infrared-emitting quantum dots (QDs) in mice. Polymer- or peptide-coated 64Cu-labeled QDs 2 or 12 nm in diameter, with or without polyethylene glycol (PEG) of molecular weight 2000, are stud…
X-Ray diffraction analysis shows the co-solubility of La3+ and Yb3+ into BaTiO3 according to the formulae LaxBa1−xTi1−xYbxO3 (LBTYb) to be as high as x = 0.45. Raman spectroscopy analysis suggests the occurrence of continuous ion clustering with increasing x, which culminates with nanometric phase separation at x ≥ 0.…
Abstract The use of a compatibilizer to improve the interactions between poly(trimethylene terephthalate) (PTT) and an organically treated montmorillonite (MMT) clay was studied. Nanocomposites, with and without compatibilizer, were obtained using a torque rheometer; their nanostructures were analyzed by wide angle X‐…
A mathematical model for predicting the evolution of bubble size distribution in Al foams is presented, which takes into account effects of both the coarsening due to gas diffusion between bubbles and the liquid drainage. A bubble size distribution equation and a one-dimensional drainage equation are solved coupledly…
We report a study of the organization of solid microparticles at oil-water interfaces, where the oil is a thermotropic liquid crystal (LC). The study was motivated by the proposition that microparticle organization and LC ordering would be coupled at these interfaces. Surfactant-functionalized polystyrene microparticl…
In this work, we studied the effect of compressed CO2 on the stability of vesicles formed in a dodecyltrimethylammonium bromide (DTAB)/sodium dodecyl sulfate (SDS) mixed surfactant system by combination of phase behavior and turbidity study, and UV-vis and fluorescence techniques. It was discovered that compressed CO2…
We study the no reflection condition for a planar boundary between vacuum and an isotropic chiral medium. In general chiral media, elliptically polarized waves incident at a particular angle satisfy the no reflection condition. When the wave impedance and wavenumber of the chiral medium are equal to the corresponding…