Materials Literature
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Four europium compounds, LiEuAsS 3 ( I), KEuAsS 3 ( IIa), RbEuAsS 3 ( IIb), and CsEuAsS 3 ( IIc), containing As (3+) were synthesized in molten alkali-metal polysulfide salts. An As-rich flux was found to be necessary to stabilize the pyramidal building unit [AsS 3] (3-). All crystallize in the monoclinic space group…
We report a detailed and quantitative study on the supramolecular complexation of amine-functionalized polyamidoamine (PAMAM) dendrimer G(4)-NH(2) with carboxylic acid terminal dendrons containing peripheral electroactive carbazole groups of different generations (G(0)COOH, G(1)COOH, and G(2)COOH). While the focus is…
In this paper, a review on electrochemical porous etching of semiconductors is proposed. After a brief history, chemical and electrochemical etching of semiconductors are considered and the pore formation models are discussed. The influences of the key parameters on porous etching are illustrated by listing the numero…
We studied the self-assembly of polydisperse diblock copolymers under various confined states by Monte Carlo simulation. When the copolymers were confined within two parallel walls, it was found that the ordered strip structures appeared alternately with the increase in wall width. Moreover, the wall width at which th…
We studied the influence of ethylene and hydrogen flow rates on the properties of carbon nanotubes (CNTs) and synthesized millimeter-long carbon nanotube arrays (CNTAs) by optimizing the ethylene and hydrogen flow rates. Our results show that the wall number, crystallinity of the graphene sheets, and length of CNTs ar…
Abstract Excellent enantioselectivities and isolated yields have been achieved for the hydrolytic kinetic resolution of epoxides using a resin‐supported dendronized R,R‐(salen)Co catalyst with catalyst loadings as low as 0.04 mol%, the lowest metal loadings of any heterogeneous resin‐supported (salen)Co catalyst repor…
Abstract A novel phosphorus‐containing thermotropic liquid crystalline copolyester with flexible spacers (P‐TLCP‐FS) was synthesized by melt transesterification from p ‐acetoxybenzoic acid ( p ‐ABA), terephthalic acid (TPA), ethylene glycol, and acetylated 2‐(6‐oxid‐6H‐dibenz(c,e) (1,2) oxaphosphorin 6‐yl) 1,4‐benzene…
Polymer burnout (pyrolysis or delubrication) is a crucial step in sintering die compacted powders. To systematically analyse and design the thermal delubrication step, the master decomposition curve (MDC) has been formulated based on the intrinsic kinetics of polymer pyrolysis. The Kissinger method was used to estimat…
Abstract The best answer to what is the melting temperature of PVC is its previous processing temperature. That temperature is where secondary crystallites, created by gelation, melt and allow the primary particle flow units to flow again independently. In the case of powder compounds being processed for the first tim…
Abstract Single crystals of barium oxalate have been grown by gel method using agar‐agar gel as media of growth at ambient temperature. The optimum conditions were established by varying various parameters such as concentration of gel, concentration of reactant, gel setting time etc. Prismatic platy shaped transparent…
This paper describes a systematic study on the thermal polymerization of both pristine 4-vinylbenzenesulfonic anion (VBS) and intercalated VBS in the two-dimensional (2D) gallery of Ni-Al layered double hydroxide (VBS/Ni-Al-LDH), by virtue of combining experimental and theoretical investigations. In situ FT-IR, in sit…
Abstract Ternary composites composed of polyoxymethylene (POM), polyurethane (PU), and boehmite alumina were produced by melt blending with and without latex precompounding. Latex precompounding served for the predispersion of the alumina particles. The related masterbatch (MB) was produced by mixing the PU latex with…
Ligand exchange reactions important in the formation of L 3 - and L 5 -protected gold clusters (L 3 = 1,3-bis(diphenylphosphino)propane; L 5 = 1,5-bis(diphenylphosphino)pentane) are investigated at the molecular level. We establish that molecular complexes, [Au(PPh 3 ) x L 2- x n ] +, in which Au + is bound to at leas…
Abstract The problem of structure investigation of thin films using laboratory XRD diffraction intensities was discussed as a matter of debate. Is the variation in relative intensities of the diffraction patterns due to crystallographic preferred orientation, lattice defects or both? The answer to this question shows…
Abstract A novel ferrocene‐based epoxy compound of glycidyl ester of 1,1′‐ferrocene dicarboxylate was synthesized by the reaction of 1,1′‐ferrocene dicarboxylate and epichlorohydrin. The resultant epoxy compound showed an irreversible redox process in cyclic voltammetry (CV) measurement. The curing behavior of glycidy…
Development of synthesis protocols for realising nanomaterials over a range of sizes, shapes, and chemical compositions is an important aspect of nanotechnology. The remarkable size-dependent physico-chemical properties of nanoparticles have fascinated and inspired research activity in this direction. This paper descr…
Defence personnel face multiple threats from different quarters, like terrorist groups and rogue nations, who own not only advanced lethal weapons but also chemical and biological warfare weapons. The present day protective clothing system used by the defence sector is vulnerable to modern weapons and also have some i…
Abstract Melting behavior and crystal morphology of poly(3‐hydroxybutyrate)‐poly( D , L ‐lactic acid) (PHB‐RPLA) blends with various compositions have been investigated by modulated temperature differential scanning calorimetry (mt‐DSC), polarized optical thermomicroscopy (POTM), modulated force thermomechanometry (mf…
We have applied positron annihilation spectroscopy combined with sheet resistance measurements to study the electrical isolation of thin ZnO layers irradiated with 2 MeV ${\text{O}}^{+}$ ions at various fluences. Our results indicate that Zn vacancies, the dominant defects detected by positrons, are produced in the ir…
A new electronegativity table of elements in covalent crystals with different bonding electrons and the most common coordination numbers is suggested on the basis of covalent potentials of atoms in crystals. For a given element, the electronegativity increases with increasing number of bonding electrons and decreases…