Materials Literature
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The microwave-assisted polyol process was investigated for the synthesis of several nanophase metals under different conditions in the temperature range of 100 to 200 °C. Nanophase Ag metal particle synthesis using ethylene glycol (EG) was carried out at 100 and 150 °C in the presence of polyvinyl pyrrolidone (PVP), d…
Temperature-dependent inelastic neutron-scattering measurements of the generalized phonon density-of-states for superconducting ${\mathrm{MgCNi}}_{3},$ ${T}_{c}=8\mathrm{K},$ give evidence for a soft-mode behavior of low-frequency Ni phonon modes. Results are compared with ab initio density-functional calculations. Th…
Two poly(pyridinium salt)s with bulky organic counterions (tosylate and triflimide) were synthesized by either the ring-transmutation polymerization reaction of 4,4‘-(1,4-phenylene)bis(2,6-diphenylpyrylium tosylate) with 1,12-diaminododecane on heating in dimethyl sulfoxide (DMSO) at 145−150 °C for 24 h or the metathe…
Abstract Trimellitic anhydride was reacted with 4,4′‐diaminodiphenyl ether in a mixture of acetic acid and pyridine (3 : 2) at room temperature and was refluxed at 90–100°C, and N,N ′‐(4,4′‐diphenylether) bistrimellitimide (3) was obtained in a quantitative yield. 3 was converted into N,N ′‐(4,4′‐diphenylether) bistri…
Abstract A series of poly(butylene succinate‐ co ‐butylene 2‐methyl succinate)s were prepared through variations in the molar fraction of succinic acid to 2‐methyl succinic acid, and the effects of methyl substitution on the shear‐induced crystallization, nonisothermal crystallization behavior, dynamic rheological pro…
We here report on the covalent grafting of various phosphated species (phosphoric acid, phenylphosphonic acid, and octyl phosphate) onto the surface of monoclinic zirconia nanoparticles obtained by hydrothermal treatment of zirconium acetate. The initial particles are 60 nm aggregates of nanometric primary grains and…
Abstract The crystal morphological properties of segmented poly(ether ester aramide) elastomers with aromatic hard‐segment amide units of uniform length were studied. Four samples with hard‐segment fractions ranging from 3.4 to 9 wt % were studied by tapping atomic force microscopy (AFM). For one sample, both solution…
Most materials expand when heated. However, many exceptions are now known. Recently, interest in this has been revived with the discovery of isotropic negative thermal expansion (NTE) in ZrW 2 O 8 . From equation of state considerations, one can relate NTE to negative Grüneisen parameters (thermal or electronic). Unde…
Abstract Emulsionen begleiten uns als industrielle Zwischenprodukte oder formulierte Produkte für Endverbraucher durch das tägliche Leben. Mikrostrukturell sind Emulsionen disperse Mehrphasensysteme aus mindestens zwei nahezu ineinander unlöslichen Flüssigkeiten. Zur Produktgestaltung müssen Eigenschafts‐ und Prozessf…
Two difunctional, asymmetric PEG linkers were synthesized and utilized to prepare water-soluble, biotinylated CdS@SiO 2 particles with various surface contents of the biotin groups. Aqueous dispersions of these particles were prepared, and upon addition of avidin, aggregation was observed using DLS, TEM, and SEM analy…
Our structural comparison of the TIM barrel metal-dependent hydrolase(-like) superfamily suggests a classification of their divergent active sites into four types: alphabeta-binuclear, alpha-mononuclear, beta-mononuclear, and metal-independent subsets. The d-aminoacylase from Alcaligenes faecalis DA1 belongs to the be…
Recent studies of the response of metals and alloys to shock-wave loading at elevated temperatures are summarized. Shock-wave tests have been carried out for metal single crystals, polycrystalline metals of different purity, and for alloys. High resistance to sub-microsecond tensile fracture of single crystals is main…
We report on temperature dependent magnetic susceptibility and Mössbauer effect studies of the influence of hydrostatic pressure (up to 1.2 GPa) on dynamic electronic structure phenomena in 3d transition metal coordination compounds. The systems under investigation are mononuclear spin crossover compounds of iron (II)…
The author has been exploring the synthesis of inorganic materials in organic solvents at temperatures (200–300 °C) higher than their boiling points (solvothermal reaction), and has developed various reaction methods for the synthesis of ultrafine particles of metal oxides. In this paper, the reactions of aluminium co…
Several metal containing compounds have been investigated after the success of the platinum agent cisplatin in the treatment of some tumors. Titanocene dichloride shows interesting properties that shed light on the molecular antitumor titanium (Ti) mechanism. A unique mechanism of action for metallocenes in vivo descr…
Abstract The extreme toughness of spider silk is dependent on the silk's ability to dissipate most of the mechanical energy imparted to the fiber during loading processes through irreversible deformations. This basic property makes the tensile behavior of spider silk fibers depend on the silk's previous deformation hi…
Abstract The fracture toughness of blends of nylon‐6 with maleated ethylene–propylene rubber and maleated styrene/hydrogenated butadiene/styrene triblock copolymer was investigated with a single‐edge‐notched three‐point‐bending instrumented Dynatup test. The blends for which the rubber particle size was less than 0.7…
The use of paramagnetic pH-sensitive liposomes was recently suggested as a new approach for monitoring pathologic changes in pH by MRI. Such liposomes must be stable in blood and selectively release the encapsulated paramagnetic agent when exposed to lower pH in the target tissue. In the present study, different lipos…
Abstract The interface archaeological bronze alloy‐chloride media was characterized by using linear sweep rate cyclic voltammetry. The electrochemical behaviour of the Cu‐Sn alloy being different from pure copper and pure tin. In fact, the voltammograms show an anodic peak and two cathodic peaks. Surface examination r…
The paper reports on the measurement of thermophysical properties (thermal conductivity and diffusivity) of PMMA (polymethylmethacrylate). The theory of the dynamic plane heat source method and the experimental apparatus are discussed. Both the sensitivity coefficients and difference analysis are used for searching th…