Materials Literature
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A selective and sensitive luminescence method for the determination of levofloxacin is described. The method is based in the luminescence signal from a terbium(III)-levofloxacin complex, in a micellar solution of sodium dodecyl sulfate (SDS), using a chemical deoxygenation agent (Na2SO3). The method allows the determi…
With the electrochemical quartz crystal microbalance, it is possible to obtain time‐resolved in situ estimates of thickness changes of passive films. Thickness changes recorded for physical vapor deposited pure Cr during potential scans in the passive region in acidic media were compared to two different theories for…
The metastable state which is produced by irradiation with the green-blue region of light was studied by IR and other spectroscopic techniques for solid states of newly synthesized nitrosyl–ruthenium complexes; cis-[Ru(Hox)(en)2NO]Cl2·EtOH, trans-[Ru(Hox)(en)2NO]Cl2, cis-K[Ru(ox)2(en)NO]·3H2O, cis-[Ru(Hox)(ox)(en)NO],…
In this article, we present a study of the influence of temperature and humidity on the electric conductivity of polyaniline and polypyrrole thin films doped with iodine and synthesized by plasma (PAn/I and PPy/I, respectively). The polymers presented the characteristic ohmic conduction mechanism via electrons; howeve…
Magnesium and copper phyllosilicates, SILMSH (M = Mg, Cu), were synthesized by a sol–gel process from the reaction of these metallic cations and mercaptotrialkoxysilane in aqueous basic solution at 298 K. The inorganic–organic hybrids formed were characterized by elemental analysis, giving 4.88 and 3.68 mmol g−1 of or…
Pulsed-laser deposition was used to make thin films of NdNiO3 on a variety of substrates. The films were found to be single phase perovskite in all cases. However, the transport behavior varied strongly as a function of the substrate used: the films were semiconducting on MgO, but showed a metal-semiconductor phase tr…
The phase-field model for dilute ternary alloys is proposed and the relationships between phase-field parameters and material properties are derived at a thin interface limit. One-dimensional and two-dimensional numerical simulations show that the model reproduces the equilibrium conditions including Gibbs–Thomson eff…
In this paper, we report the first direct observations of local ordering in undoped and La‐doped Pb(Mg 1/3 Nb 2/3 )O 3 (PMN) on an atomic scale by high‐resolution (∼1.26 Å) Z ‐contrast imaging. The 1:1 ordering occurs by a variation in the occupancy of Mg and Nb cations between B I and B II sublattices. In ordered reg…
Montmorillonite-PCH (porous clay heterostructure) and saponite-PCH are inorganic silica-like materials with large surface areas (∽1000 m2 g−1) and pore volumes (0.7 cm3 g−1). They are obtained by introducing a surfactant template in-between the clay plates and subsequently polymerizing a silica source around them. The…
The synthesis and evaluation of the mesomorphic properties of the first trimesogen consisting of three non-identical calamitic mesogenic entities have been described.
We summarize briefly our recently published concept for the design of novel, superhard nanocomposite materials. The fairly general validity of this design concept was documented by the preparation of a number of nanocomposites consisting of nanocrystalline transition metal nitrides and amorphous Si3N4 or BN of differe…
A series of rare earth(III) double-deckers RE[Nc(tBu)4]2 [RE = La, Ce, Pr, Nd, Eu, Gd, Tb, Y, Er; Nc(tBu)4 = dianion of tetra(tert-butyl)-2,3-naphthalocyanine] (1–9) have been prepared by treating RE(acac)3·n H2O (acac = acetylacetonate) with 6-tert-butylnaphthalonitrile in refluxing n-octanol in the presence of 1,8-d…
Polystyrene and polyethyleneterephthalate (PET) coupons were exposed to r.f. plasmas containing helium, oxygen and nitrogen. The modified surfaces were characterized by x-ray photoelectron spectroscopy shortly following plasma treatment and after storage in air for about 360 days. The oxygen concentration in polystyre…
In this work, zinc borate is used as synergistic agent in EVA–Mg(OH)2 flame-retardant (FR) formulations. High zinc borate content leads to a significant improvement of flame retardancy during cone calorimeter experiments. Blowing measurements reveal significant modification of the structure due to the presence of zinc…
The physico-chemical phenomena developing along the screw axis of a twin-screw extruder during the grafting of maleic anhydride (MA) onto polyolefins [polyethylene (PE), ethylene–propylene rubber (EPM), and polypropylene (PP)] were investigated. For this purpose, sampling devices located along the extruder barrel were…
The purpose of this paper is to study the molecular mobility of paracetamol molecules in their amorphous state below the glass transition temperature (Tg) in order to evaluate the thermodynamic driving force which allows the amorphous form to recrystallize under different polymorphic modifications. Samples were aged a…
Some properties of serine acetyltransferases (SATs) from Escherichia coli, deleting 10-25 amino acid residues from the C-terminus (SATdeltaC10-deltaC25) were investigated. The specific activity depended only slightly on the length of the C-terminal region deleted. Although the sensitivity of SATdeltaC10 to inhibition…
The thermal and mechanical properties of corn (maize) (CZ) films plasticized with poly(ethylene glycol) (PEG) of two different molar masses (400 and 1000 g mol−1) were studied using differential scanning calorimetry (DSC), dynamic mechanical thermal analysis (DMTA), tensile strength, moisture absorption isotherms and…
The structure of glasses in the K 2 O-Al 2 O 3 -TiO 2 -SiO 2 system was investigated using XANES spectroscopy. Glass samples, synthesized by quenching in air from high temperature fusions, represent the addition of Al 2 O 3 to a base of composition K 2 TiSi 4 O 11 in amounts corresponding to 0.25, 0.50, 0.75, 1.00, 1.…
Jute–polyester composites were fabricated with untreated (control) and bleached slivers with 60% loading of fiber by weight and were designated as JPH(C) and JPH(B), respectively. Both types of composite specimens were subjected to water absorption and outdoor weathering tests to assess their relative performance unde…