Materials Literature
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Opposite effects on the width of the dispersion of the α-relaxation and the separation on the time scale of the Johari-Goldstein β-relaxation from the α-relaxation are predicted for guest molecules dissolved in a host, depending on whether the glass transition temperature of the host is higher or lower than that of th…
Using time-resolved dielectric relaxation spectroscopy, we have studied the kinetics of the first-order phase transformation of caffeine from its high temperature rotational solid form to the room temperature phase. The results indicate that the kinetics can be fitted by a highly stretched exponential law. The kinetic…
The synthesis, X-ray structure and magnetic properties of polynuclear Cr(III) complexes with the croconate ligand (C5O5(2-)) are reported: [Cr(mu-C5O5)(micro-OH)(OH2)2]2 x 6H2O (, orthorombic, space group Cmca, a = 6.741(7) A, b = 18.841(9) A, c = 16.886(9) A, V = 2145(3) A3) shows a dinuclear structure with two mu-OH…
Abstract Montmorillonite, organically modified by octadecylammine salt, has been adopted to successfully fabricate the exfoliated organic montmorillonite/poly(3,4‐ethyldioxythiophene) (OMMT/PEDOT) nanocomposites by in situ polymerization in aqueous media. Hydrochloric acid, 1,5‐naphthalenedisulfonic acid, and sodium b…
In this paper we explore complex relationships between mechanical and sensory properties of fabrics, and the perceived tactile comfort. Mechanical properties, measured objectively by Kawabata Evaluation System for Fabrics (KES-FB), and handfeel properties, measured subjectively by sensory expert panel, are related to…
A recent article by Elati et al. (Elati, C. R.; Kolla, N.; Vankawala, P. J.; Gangula, S.; Chalamala, S.; Sundaram, V.; Bhattacharya, A.; Vurimidi, H.; Mathad, V. T. Org. Process Res. Dev. 2007, 11, 289−292) describes the synthesis of escitalopram by means of a three-step process: (i) an alkylation reaction to provide…
We performed dissipative particles dynamics (DPD) simulations for the melts of various star and comb diblock copolymers with equal molecular weight ( L = 41 beads) but with various types of internal branching. To assist formation of native morphologies, an anisotropic N P T ensemble was used. For the linear diblock po…
We present a comprehensive study of data for the dielectric relaxation of ten glass-forming organic liquids at high-pressure along isotherms, showing that the primary (α) high-frequency relaxation is well-characterized by the minimum slope and the width of the loss peak. The advantage of these two parameters is that t…
Abstract Combustion of titanium particles in air may potentially be used for the in situ synthesis of nanoscale TiO 2 particles, which can photocatalytically degrade chemical and biological air pollutants. The knowledge of Ti particle reactions in O 2 ‐containing atmospheres is required to develop this method. In the…
We report on the synthesis and structural/microstructural studies of iron-based fluorine doped LaOFeAs superconductors. We have successfully synthesized fluorine doped superconducting LaO 1− x F x FeAs materials by choosing lower temperature (∼1150 °C) and longer synthesis duration (∼60 h) as compared to the standard…
Abstract Chemical derivatization XPS is used for the quantitative determination of amines at conventional organic surfaces, and it is also applied to plasma‐processed aminated surfaces. When using TFBA and PFB as derivatization reagents for tagging primary amino groups, unexpected fluorine species were observed in the…
The main relaxation observed in supercooled ethylcyclohexane in the 50 Hz–20 kHz frequency range using high-resolution dielectric spectroscopy displays an unusual relaxation pattern. The slope of the dielectric loss profile above the peak frequency, progressively tends to zero with increasing temperature. The observed…
A periodic mesoporous organosilica (PMO) with nanorice morphology was successfully synthesized by a template assisted sol-gel method using a chain-type precursor. The PMO is composed of D and T sites in the ratio 1:2. The obtained mesoporous nanorice has a surface area of 753 m(2) g(-1), one-dimensional channels, and…
Abstract Most pharmaceutical manufacturing processes include a series of crystallization processes to increase purity with the last crystallization used to produce crystals of desired size, shape, and crystal form. The fact that different crystal forms (known as polymorphs) can have vastly different characteristics ha…
Ternary chalcogenide glass films from identical parent bulk glasses were prepared by thermal evaporation (TE) and pulsed laser deposition (PLD) and subjected to 810-nm femtosecond laser exposure at both kHz and MHz repetition rates. The exposure-induced modification on the glass film's surface profile, refractive inde…
We present a systematic pressure study of poly- and single-crystalline ${\text{SrFe}}_{2}{\text{As}}_{2}$ by electrical-resistivity and x-ray-diffraction measurements. ${\text{SrFe}}_{2}{\text{As}}_{2}$ exhibits a structural phase transition from a tetragonal to an orthorhombic phase at ${T}_{0}=205\text{ }\text{K}$.…
The crystal structure of the mineral routhierite, Tl(Cu,Ag)(Hg,Zn)(2)(As,Sb)(2)S(6), was solved and refined for the first time by means of single-crystal X-ray diffraction. The crystal structure consists of (Cu,Ag)S(4) and (Hg,Zn)S(4) tetrahedra, which share corners to form a framework with channels parallel to [001].…
Abstract This paper investigates by means of XPS analysis the surface functionalization of soda‐lime and fused quartz glass substrates with hexachlorocyclophosphazene (HCCP), obtained by simple immersion in solutions of phosphazene in anhydrous solvents. Several experimental parameters like reaction solvent, temperatu…
4′-(4-{2-[4-( N, N -diphenylamino)phenyl]ethenyl}phenyl)-2,2′:6′,2′′-terpyridine is a highly conjugated compound, which is used to grow polymorphs. The results obtained suggest that polymorphs could appear as the Eu 3+ /Ag + -induced feature. Only three intermolecular C−H···π interactions stabilize the polymorph A in…
Fracture features, residual stresses, and zirconia transformation are studied in indentation strength specimens of alumina‐Y 2 O 3 ‐stabilized zirconia (3% mol of Y 2 O 3 , 3YTZP) ceramics in order to analyze the extension of the indentation damage in the bulk of the specimens. Two compositions, 5 vol% 3YTZP (A5) and…