Materials Literature
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Polycondensation normally proceeds in a step-growth reaction manner to give polymers with a wide range of molecular weights. However, the polycondensation of potassium 5-cyano-4-fluoro-2-propylphenolate ( 1 ) proceeded at 150 °C in a chain polymerization manner from an initiator, 4-fluoro-4‘-trifluoromethylbenzophenon…
The carryover of surfactant ahead of contact lines on hydrophilic surfaces results in unusual wetting behavior of surfactant solutions, such as the autophobic effect. This carryover of surfactant ahead of the contact line is due to the strong interactions between the hydrophilic surface and the headgroup of ionic and…
We study a lattice model with two-body interactions that reproduces in three dimensions many features of structural glasses, such as cage effect and vanishing diffusivity. While having a crystalline state at low temperatures, it does not crystallize when quenched, even at the slowest cooling rate used, which makes it…
Abstract Olduvai Gorge, Tanzania (East African Rift) exposes a 100 m thick Plio-Pleistocene sequence of dominantly volcaniclastic sediments deposited in a 50 km wide closed basin containing a playa lake. A scanning transmission electron and analytical electron microscopy (STEM/AEM) study of authigenic clay minerals in…
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Binding of poly(amido amine) dendrimer on sodium poly- l -glutamate (NaPGA) in aqueous solutions of 0.01 and 0.1 M NaCl has been investigated by static light scattering. It was observed that the weight-average molecular weight and the radius of gyration increase sharply, when a certain molar ratio of dendrimer to NaPG…
Abstract In this work the effect of three processing cycles on the physical properties of polypropylene (PP) was studied and related to the changes in the structure (molecular weight, molecular weight distribution, morphology) occurring during recycling. In order to simulate both the use and the recycling process of P…
Abstract The copolymerization of butadiene (Bd) and isoprene (Ip) with a supported titanium‐triisobutyl aluminum catalyst system was studied. An analysis using differential scanning calorimetry, X‐ray diffraction, and 13 C‐NMR spectra indicated that products with 25–60 mol % Bd units were random copolymers and that th…
We modify the conventional Mitsui model by including the terms related to piezoelectric coupling with shear strain ${\ensuremath{\varepsilon}}_{4}.$ The static and dynamic dielectric, piezoelectric, and elastic characteristics of a Rochelle salt crystal are calculated. It is shown that taking into account piezoelectri…
We investigate the ground states of classical Heisenberg spin systems which have point group symmetry. Examples are the regular polygons (spin rings) and the seven quasi-regular polyhedra including the five Platonic solids. For these examples, ground states with special properties, e.g. coplanarity or symmetry, can be…
The optical band gap ( E g ) of Pb 1− x Fe x S solution-grown nanoparticle films was varied from 2.65 to 2.22 eV with an increase in iron concentration 0.25 ≤ x ≤ 0.75 in films grown at fixed pH and temperature by the chemical bath deposition method. The presence of excitonic structure in the ternary Pb 1− x Fe x S fo…
Abstract Four oil absorbents based on styrene–butadiene (SBR)—pure SBR (PS), 4‐tert‐ butylstyrene–SBR (PBS), EPDM–SBR network (PES), and 4‐tert‐ butylstyrene‐EPDM‐SBR (PBES)—were produced from crosslinking polymerization of uncured styrene–butadiene rubber (SBR), 4‐tert‐ butylstyrene (tBS), and ethylene–propylene–dien…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTGeneration of Metal Nanoparticles on Montmorillonite K 10 and Their CharacterizationOmar S. Ahmed and Dipak K. DuttaView Author Information Department of Chemistry, Bahona College, Bahona 785101, Jorhat, Assam, India Material Science Division, Regional Research Laboratory (CSIR…
The preparation of the first photochromic, organometallic derivative of the diarylethene class, the CpRu-complexed benzodimethyldihydropyrene 3, in which the organometallic is directly attached to the photochromic core, is described. The negative dark purple photochrome 3 readily bleaches to form the almost colorless…
We report the structure and the magnetic properties of a cobalt(II) compound with the amino acid l-threonine, Co(C(4)H(8)NO(3))(2)(H(2)O)(2). It crystallizes in the orthorhombic chiral space group C222(1), with a = 5.843(5) A, b = 10.120(10) A, c = 22.36(3) A, and Z = 4. The Co(II) ion is in a deformed octahedral envi…
[2]Catenanes made up of several polyether-strapped porphyrin macrocycles interlinked with the cyclic electron acceptor cyclobis(paraquat-p-phenylene) were spectroscopically, photophysically, and electrochemically characterized. The catenanes exhibit very rich redox behavior due to the presence of several different and…
Abstract Calcium barium niobate (CBN), also like strontium barium niobate (SBN), belongs to the materials family of partially filled tetragonal tungsten bronzes, which show relaxor‐type ferroelectric phase transitions and large electro‐optic effects. For the first time, it was possible to grow large single crystals of…
Chemical functionalization on nano-scaled silica particles was performed through the reaction between the silanol group of silica and the oxirane ring of epoxy compounds. The occurrence of the surface functionalization and the chemical structures of the resulting products were characterized with FTIR and 1 H NMR. Ener…
Abstract Acrylic fibers are among the most useful synthetic fibers for textile applications, and special acrylic fiber (SAF) has industrial applications. The physical and mechanical properties of fiber are affected by several parameters; one such parameter is coagulation conditions: bath temperature, bath composition,…
Novel pi-extended tetrathiafulvalene (exTTF)-based donor acceptor hybrids-dyads and triads-have been synthesized following a multistep synthetic procedure. Cyclic voltammetry and absorption spectroscopy, conducted in room temperature solutions, reveal features that are identical to the sum of the separate donor and ac…