Materials Literature
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A high-resolution calorimetric study has been carried out on nanocolloidal dispersions of aerosils in the liquid crystal $4\text{\ensuremath{-}}n$-pentylphenylthiol-${4}^{\ensuremath{'}}\text{\ensuremath{-}}n$-octyloxybenzoate $(\overline{8}\mathrm{S}5)$ as a function of aerosil concentration and temperature spanning…
The dielectric and electrical conductivity properties of x Pb(Mn 1/3 Sb 2/3 )O 3 –(1− x )Pb(Zr 0.52 Ti 0.48 )O 3 (PMS–PZT) ceramics were studied. X‐ray diffraction indicated that all samples exhibit a single‐phase perovskite structure. Dielectric study revealed that the dielectric relaxor behavior was induced by co‐do…
The emission and excitation spectra of $\mathrm{Ba}{\mathrm{F}}_{2}$ doped with 0.3 and $3.0\phantom{\rule{0.3em}{0ex}}\mathrm{mol}\phantom{\rule{0.2em}{0ex}}%$ ${\mathrm{Pr}}^{3+}$ have been studied using synchrotron radiation in the range from $5\phantom{\rule{0.3em}{0ex}}\text{to}\phantom{\rule{0.3em}{0ex}}30\phant…
The effects of excess ZnO addition on phase structure, dielectric and piezoelectric properties in pure and La‐doped lead zinc nicobate (PZN)—lead zirconate titanate (PZT) systems have been investigated. Addition of excess ZnO helps suppress and prevents the formation of pyrochlore phase for both systems. However, the…
Time-dependent specific heat experiments on the molecular nanomagnet Fe8 and the isotopic enriched analogue 57Fe8 are presented. The inclusion of the 57Fe nuclear spins leads to a huge enhancement of the specific heat below 1 K, ascribed to a strong increase in the spin-lattice relaxation rate gamma arising from incoh…
Glow discharge cleaning (GDC) is a widely used technique for wall conditioning in fusion experimental devices. Though the cleaning effects of GDC are essentially related to the microscopic modification of the wall surface, there are few reports about it. In the present study, specimens of wall materials were exposed t…
Abstract The effect of the compatibility between a dispersed phase and a matrix polymer and the annealing on improvement in the toughness of injection‐molded isotactic polypropylene (i‐PP) blended with elastomers was studied. Two grades of ethylene‐propylene copolymer (EPR(A) and EPR(B)) and styrene‐ethylene‐butadiene…
Sterically stabilized silica nanoparticles were synthesized, and turbidity measurements confirmed that they behaved as hard spheres in cyclohexane. Poly(isoprene) was added to give mixtures in the protein limit with a polymer coil/colloid radius ratio of 4.8. Their phase behavior under good solvent conditions was stud…
The first examples of liquid crystalline chloro-bridged dinuclear palladium organyls carrying semiperfluorinated alkyl chains at their peripheries have been synthesised. The liquid crystalline properties were investigated using polarised optical microscopy, differential scanning calorimetry and X-ray scattering. Compo…
An ampholytic N-carboxyethyl chitosan (CEC), with various isoelectric points (IPs), was synthesized by grafting acrylic acid on chitosan utilizing Michael's reaction. Compared to native chitosan, CEC has enhanced water solubility and dramatically accelerated enzymatic degradation; the rate of degradation is proportion…
Abstract Functions are proposed to model the time‐temperature shift factor at temperatures below the glass transition temperature ( T g ) for certain amorphous polymers, which increases linearly with the decrease of temperature at temperatures just below T g in a log‐linear plot, but shows an inflection with the slope…
The redox properties of a monolayer of alkanethiolate-protected gold nanoclusters (MPCs) constructed on a gold slide electrode was studied in 1,2-dichloroethane (DCE) electrolyte solutions. The influence of the electrostatic interaction between attached MPCs and the substrate electrode on the absolute standard redox p…
We have examined the redox behavior of the osmium and ruthenium compounds (OEP)M(NO)(OEt) and (OEP)M(NO)(SEt) (OEP = octaethylporphyrinato dianion; M = Os, Ru) by cyclic voltammetry and infrared spectroelectrochemistry. The compound (OEP)Os(NO)(OEt) undergoes a single reversible oxidation process in dichloromethane. I…
Abstract Summary: Flexible heaters were prepared by extruding platinum‐catalyzed silicone rubber compound with electroconductive carbon black (CB) and SnO 2 /Sb coated titanium dioxide (TiO 2 ). Two types of acicular‐shaped TiO 2 with average particle sizes of 1.7 and 5.2 µm, and two types of spherical‐shaped TiO 2 wi…
Abstract The crystallization behavior of intercalated Poly( L ‐lactide) (PLLA)/organo‐modified montmorillonite hybrids has been investigated in term of growth of spherulites and bulk crystallization. The PLLA hybrids were prepared via melt‐compounding between PLLA and montmorillonite organo‐modified (organoclay) with…
A modified Campbell model has been provided considering the internal stress and the “core‐shell” microstructure that occurs in X7R‐type multilayer ceramic capacitors (MLCCs). The capacitance stability coefficient α was defined to denote the effect of a direct current (DC) bias field on the capacitance of MLCCs. Accord…
Abstract Summary: A novel series of supramolecular polymers based on zinc‐salen chromophores were readily prepared via ligand‐metal coordination. These polymers were characterized by FT‐IR, NMR, GPC and elemental analysis. All the polymers were readily soluble in common organic solvents and had substantially good ther…
Abstract The mechanical properties of blends of isotactic polypropylene (PP) and poly[ethylene‐ co ‐(vinyl acetate)] (EVA) are studied under tension at several temperatures (from −30°C to room temperature). The morphology and thermal properties are given attention at every stage of the stretching process. To improve t…
We show that when the graphene planes of graphite are uniformly expanded, thereby increasing the CC bond length to $1.7\phantom{\rule{0.3em}{0ex}}\mathrm{\AA{}}$, the ${\ensuremath{\sigma}}^{*}$ edge onset of the energy-loss near-edge structure (ELNES) spectrum shifts to lower energies by almost $5\phantom{\rule{0.3e…
We present the results of the Raman study of lattice dynamics and development of mesoscopic range order in a relaxor ferroelectric $\mathrm{Pb}({\mathrm{Zn}}_{1∕3}{\mathrm{Nb}}_{2∕3}){\mathrm{O}}_{3}$ crystal containing 4.5% of $\mathrm{Pb}\mathrm{Ti}{\mathrm{O}}_{3}$ as it is cooling down from $1000\phantom{\rule{0.3…