Materials Literature
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Photochromic ring closure reaction dynamics of 1,2-bis(2-methylbenzo[b]thiophen-3-yl)hexafluoro cyclopentene and its derivatives in solution has been studied by femtosecond time-resolved fluorescence. Time-resolved spontaneous fluorescence of the open isomer reveals a fast component of around 1 ps and a slow component…
This article investigates the influence of varying strand spacings in the case of siro or double-rove yarns. Studies have been carried out on cotton, polyester and polyester–cotton yarns. Although the trend is found to be the same, cotton yarns exhibited the best cohesion followed by polyester–cotton and polyester yar…
The effect of variables, namely yarn fineness, shrinkable acrylic proportion and twist level, on various properties of cotton–acrylic blended bulked yarns has been studied by relaxing shrinkable component of the yarns using boiling water treatment. A three-variable factorial design technique proposed by Box and Behnke…
Abstract The agglomeration of paracetamol during crystallization in different pure solvents has been investigated. Narrowly sieved crystals were suspended as seeds and allowed to grow and agglomerate at constant supersaturation and temperature. Particles from each experiment were examined by image analysis and multiva…
Abstract A novel synthetic approach towards heteroleptic triple‐decker crown‐phthalocyaninato complexes [(15C5) 4 Pc]M[(15C5) 4 Pc]M(Pc) and (Pc)M[(15C5) 4 Pc]M(Pc) [where (15C5) 4 Pc 2– = 2,3,9,10,16,17,24,25‐tetrakis(15‐crown‐5)phthalocyaninato dianion; Pc 2– = phthalocyaninato dianion; M = Sm, Tb, Dy, Tm and Y] has…
ABSTRACT Emulsion coatings were formulated and films were developed using pectin as the basic structural component. Preliminary experiments were carried out to determine the proper type and concentration of pectin, lipid and plasticizers in the film. The effects of pectin, beeswax and sorbitol concentration on water v…
Proton and deuteron field-cycling NMR relaxometry was applied to deuterated and undeuterated bulk polyethyleneoxide and polybutadiene melts and mixtures thereof with molecular weights above the critical value. Spin-lattice relaxation data due to intrasegment (quadrupolar) couplings and intra- and interchain (dipolar)…
In this paper we investigate glass transition in aqueous suspension of synthetic hectorite clay, laponite. We believe that upon dispersing laponite clay in water, the system comprises of clusters (agglomerates) of laponite dispersed in the same. Subsequent osmotic swelling of these clusters leads to an increase in the…
Abstract Poly(propylene) (PP) composites were prepared by using eggshell (ES) as filler and their mechanical properties were compared with those using talc (TA) and calcium carbonate (CC) of different grain sizes ( X 50 ). A decrease in impact strength and deformation at break with increase in filler content was obser…
Thermal, optical, X-ray excited and magnetic methods were used to develop a microstructural model of physical ageing in Se-rich glasses. The glass composition As10Se90, possessing a typical cross-linked chain structure, was chosen as a model object for the investigations. The effect of physical ageing in this glass wa…
The intrinsic Zeeman energy is precisely one half of the cyclotron energy for electrons in graphene. As a result a Landau-level mixing occurs to create the energy spectrum comprised of the $4j$-fold degenerated zero-energy level and 4-fold degenerated nonzero-energy levels in the $j$-layer graphene, where $j=1,2,3$ fo…
Abstract Experimental methods, apparatus, and practically useful theoretical analysis are provided for the coagulation‐based spinning of effectively unlimited lengths of carbon nanotube fibers having exceptional toughness and reasonably high strength. This spinning process fundamentally depends on the mechanical prope…
Micellization of a diblock copolymer in dilute solution is studied by dissipative particle dynamics. The influence of the compatibility between blocks A and B and the interaction between the insoluble block and solvent on aggregation number P and micellar core radius Rc are examined. The micelle size distribution is o…
Rocksalt Zn x Ni 1 - x O solid solutions, which form at the nickel-rich end of the phase diagram, can be prepared over a wide compositional range and are homogeneous up to Zn 0.32 Ni 0.68 O when prepared by thermal dissolution in air. Auger parameter analysis indicates that the zinc is octahedrally coordinated, an unu…
Abstract The early stages of formation of the crystalline elements in the continuously forming sea urchin teeth were studied using polarized light microscopy, SEM, TEM and calcite overgrowth. Transient amorphous calcium carbonate (ACC) is initially deposited in the needles and subsequently transforms into a single cry…
The dynamics of charge separation and transport in metal-oxide nanostructures used in nanocomposite solar cells is measured by time-resolved surface photovoltage (SPV) and described by random walk numerical simulations (RWNS). Characteristic features of anomalous diffusion and trap-limited electron transport are obser…
Abstract We examined the formation of microcellular foam in a thermoplastic polyurethane elastomer (TPU) with supercritical carbon dioxide. Measurements of the permeability and impregnation with carbon dioxide suggested that the impregnation of TPU with carbon dioxide was affected by the soft‐segment chain length and…
Polyhedral oligomeric silsesquioxane (POSS)-capped PCL was synthesized via ring-opening polymerization of ε-caprolactone with 3-hydroxypropylheptaphenyl POSS as the initiator. The novel organic−inorganic amphiphile was incorporated into epoxy resin to prepare the organic−inorganic hybrid thermosets. The morphology of…
The Meerwein-Ponndorf-Verley (MPV) reaction involves the catalysed transfer of hydrogen from an alcohol to a carbonyl compound and provides an effective method for synthesizing carbonyl compounds under very mild conditions. The method, which requires the use of a catalyst, is high selective as it leaves most reducible…
Abstract This critical review analyzes the behavior of natural and synthetic polyampholytes and current theoretical descriptions based on Coulomb interactions between complementary charges. Sequences of bonds and groups that occur between fixed charges display interactions with other groups along the chain, or with so…