Materials Literature
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The interactions of cobalticyanide and nitroprusside with magnesium aluminum layered double hydroxide are investigated using oriented infrared spectroscopy together with powder X-ray diffraction. Cobalticyanide is known to intercalate into layered double hydroxides in the same manner as ferrocyanide, with its 3-fold r…
The distribution function of relaxation times in disordered dielectrics has been calculated in the random field theory framework. For this purpose, we first consider the dynamics of single two-orientable impurity electric dipole in a random electric field $E$ created by the rest of impurities in disordered ferroelectr…
Phase diagram of solid solutions of antiferroelectric and ferroelectric materials like PbZr$_{1-x}$Ti$_x$O$_3$ (PZT), Rb$_x$(NH$_4$)$_{1-x}$H$_2$PO$% _4$ (RADP) is calculated at the region $x\leq 0.1$. Antiferroelectric and ferroelectric order parameters (which correspond respectively to the difference and sum of two…
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The effects of carbon black filler and polyethylene matrix morphology on void formation in conductive composites have been studied by small-angle neutron scattering. Void formation was observed to occur postprocessing during polyethylene crystallization as a result of filler particle/polymer matrix interactions. Carbo…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXT1-Bromobicyclo[1.1.0]butane as an Easily Obtainable C4-Building Block: A Novel Route to Cyclobutanone†Jürgen Weber, Ulrike Haslinger, and Udo H. BrinkerView Author Information Department of Chemistry, State University of New York, Binghamton, New York 13902-6016, and Institut f…
The new three-dimensional cobalt(II) complex of formula [Co2(bpm)(H2O)2(CO3)(OH)]NO3·4H2O (1) is obtained from aqueous solutions containing cobalt(II) nitrate hexahydrate, 2,2‘-bipyrimidine (bpm), and potassium bicarbonate. The cobalt atoms are bridged by bischelating bpm, single μ2-hydroxide, and μ4-carbonate groups.…
Boron-bearing 2M1 polylithionite and 2M1 + 1M boromuscovite from an elbaite pegmatite at Řecice, western Moravia, Czech Republic.
The action spectra of the colloidal TiO 2 -photosensitized oxidations of bifunctional aromatics in 1 mM phosphate colloidal media provide firm evidence that electron transfer from outer-sphere donors can compete with excited hole relaxation at nanoparticle interfaces. The possibility and extent of the competition are…
Catalysis over Lewis acid sites on siliceous mesoporous FSM-16 was confirmed. Acidic property of FSM-16 was studied by pyridine TPD measurements, and catalyses of α-pinene isomerization and methylamine synthesis. FSM-16 possess both Brønsted and Lewis acid sites, and another Lewis acid site formed on FSM-16 when a cat…
Various surface processes for the system B/N/H/F occurring during CVD growth of c-BN (111) have been investigated theoretically, using quantum mechanical methods. Both F and H species were found to be efficient as surface stabilizing agents. Mainly the H-terminated part of the B(111) surface will most probably undergo…
The representation of all components of the tensor of linear thermal expansion by temperature derivatives of lattice parameters a, b, c, alpha , beta , and gamma has been extended to triclinic symmetry. The advantages of this approach are elucidated by taking data of alpha -CuMoO 4 as an example. The uncertainty due t…
Preparation of Grignard reagents from organic halides and magnesium pose potential safety hazards on scale-up due to their high exothermic potential which can lead to overpressurization, discharge of contents, or explosion. One of the main challenges arises in ensuring the reaction has initiated before excessive accum…
This paper reports the synthesis and physical properties of a novel aromatic polymer which contains the tridentate 2,6-bis(benzimidazol-2-yl)pyridine moiety. It was found that the polymer exhibits different luminescence properties in solution and in the solid state because of the formation of polymer aggregates. Upon…
A novel 2-perfluoroalkyl-activated bisfluoro monomer has been synthesized successfully using a Pd(0)-catalyzed cross-coupling reaction of 4-fluoro-3-trifluoromethyl phenyl boronic acid with 4,4‘-dibromodiphenylbenzene. This monomer was converted to novel poly(aryl ether)s by nucleophilic displacement of the fluorine a…
The occurrence of barium sulfate scale (BaSO 4 ) is a severe problem and its associated environmental concerns in oil and gas production worldwide will cause considerable production losses. Chemical dissolution will create a new direction for controlling the scale deposits by chelating agents, which form strong comple…
The aenigmatite-rhonite mineral group consists of eight minerals: Aenigmatite, rhonite, serendibite, krinovite, welshite, dorrite, wilkinsonite and hogtuavite. The general chemical formula of the minerals in this group may be written as {X2} [Y6] (Z6) O 20 , with {X} eightfold coordinated Na (super +) , Ca (super 2+)…
A synthetic access to the first members of expanded corroles 1 and 2 is achieved through formation of two direct pyrrole−pyrrole links by an oxidative coupling reaction. Spectroscopic and structural analysis reveal that 1 and 2 are 22Π aromatic macrocycles despite the nonplanar structure and properties resemble that o…
Interactions of the water-soluble tetra(4-sulfonatophenyl)porphyrin (TPPS 4 ) with ionic micelles in aqueous solutions have been studied by optical absorption, fluorescence, resonance light-scattering (RLS), and 1 H NMR spectroscopies. The presence of three different species of TPPS 4 in cationic cetyltrimethylammoniu…
Hollow polyelectrolyte capsules were fabricated by means of stepwise adsorption of polyelectrolytes followed by dissolution of the templating core. The capsule wall thickness was approximately 20 nm. The diameter of the capsules is given by the size of the templates (3.3 μm). These capsules exclude poly(styrenesulfona…