Materials Literature
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INTRODUCTION Combining thermal analysis (TA) with gas-analykal techniques significantly enhances the possibilities for correctly interpreting the mechanism of thermally induced reactions, which involve the formation of gaseous species. Several techniques can be used for evolved gas analysis (EGA), ranging from simple,…
Electrically conductive silicone rubber composites have been prepared through incorporation of conductive acetylene black and short carbon fibre (SCF). The percolation limit for the attainment of high conductivity is found to be relatively less for silicone rubber based composites compared to EPDM or NBR based composi…
Phengitic muscovite-2M 1 crystals [ [12] (K 0 . 88-0 . 99 Na 0 . 01-0.09 Ca 0 . 00-0.06 Ba 0 . 00-0.01 ) [6] (Al 1 . 64-1.88 Fe 2+ 0.06-0 . 29 Fe 3+ 0.01-0.16 Mg 0.00-0.16 Mn 0.00-0.07 Ti 0.00-0.06 ) [4] (Si 2.87-3.30 Al 0.70-1.13 )(OH) 1.56-2.07 F 0.00-0.41 O 9.91-10.25 ] from pegmatites and peraluminous granites wer…
Field emission properties of undoped chemical vapor deposited diamond and diamond-like carbon films have been measured for a variety of different deposition conditions. The nature and appearance of the damage site after testing has been investigated with scanning electron microscopy and laser Raman mapping. These obse…
The grain growth in silica‐doped 3‐mol%‐yttria‐stabilized tetragonal zirconia polycrystals (SiO 2 ‐doped 3Y‐TZP) and undoped 3Y‐TZP has been examined in the temperature range of 1400°‐1800°C. The presence of a SiO 2 phase inhibits rather than promotes the grain growth in 3Y‐TZP, particularly at high temperatures. Duri…
This paper reports on aging of the silicone oil MS704 for sudden changes of temperature from 210.5 to 209.0 K and from 207.5 to 209.0 K studied by continuously monitoring the instantaneous shear modulus ${G}_{\ensuremath{\infty}}$. The results are interpreted within the Tool-Narayanaswamy formalism with a reduced time…
Dynamic light scattering and sedimentation measurements are carried out to study the motion of probe particles in neutral and adsorbing polymer solutions. By varying the microscopic interaction between the colloidal particle and the polymer molecule, we observe three different behaviors to the Stokes−Einstein (SE) equ…
The collective behavior of a system of straight parallel dislocations is investigated. It is found by numerical simulation that the internal stress $\ensuremath{\tau}$ created by the dislocation has a stochastic component. In order to describe this stochastic character the form of the probability distribution function…
Abstract It is important to determine the existence and composition of homogeneous azeotropes in the analysis of phase behavior and in the synthesis and design of separation systems, from both theoretical and practical standpoints. A new method for reliably locating any and all homogeneous azeotropes for multicomponen…
Solid samples of polycrystalline corundum α -Al 2 O 3 activated by triply-charged rare-earth ions RE 3+ (R=Eu 3+ , Er 3+ , Pr 3+ ) were synthesized by the sol-gel technology. Characteristic narrow-line optical absorption and luminescence spectra produced by intraconfigurational 4 f -4 f transitions in RE 3+ ions have…
1. In this field study, diatom‐specific and bacteria‐specific fatty acids were used as biomarkers to evaluate the differences in diet between Chironomus plumosu s (a spring‐emerging cohort) and C. anthracinus (an autumn‐emerging cohort), and Procladius spp. Furthermore, total lipid content of Chironomus larvae was ana…
Electromagnetic levitation is used to undercool bulk samples of eutectic Ni 21.4 at % Si alloys. Large undercoolings ΔT up to ΔT=220 K are achieved by containerless processing of the melts. Crystal growth velocities are measured as a function of undercooling. The growth kinetics during solidification of the eutectic a…
The optical birefringence (Δ n ) and dielectric anisotropy (Δ ε ) of nematic liquid crystals were calculated using the well-known theories of Vuks and Maier-Meier, respectively. The molecular dipole moments and polarizabilities needed for the estimation were taken from semiempirical AM1 calculations. The calculated va…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTMaleic Anhydride Modified Polypropylene with Controllable Molecular Structure: New Synthetic Route via Borane-Terminated PolypropyleneBing Lu and T. C. ChungView Author Information Department of Materials Science and Engineering, Th…
The different generations of BOC-protected glycine-functionalized PAMAM dendrimers were studied, crystal structure of the 1st generation dendrimer was obtained, and the amt. of H bonds was estd. The x-ray structure shows multiple interactions between the different end groups of the dendrimer, modeling the shell of a h…
Chalcogenolates of the smaller lanthanides (Ln) react with elemental chalcogen to give the first examples of cubane clusters containing Ln ions. Both (py)8Yb4Se4(SePh)4 and (py)10Yb6S6(SPh)6 were isolated; the Se compound exhibits the familiar M4E4 structural motif, while the S compound is best described as a double c…
We etched thermally poled fused-silica coverslips in 49% HF for 30 s transverse to the poling direction to reveal structural details of the nonlinear region. A peaked ridge below the anode surface, corresponding to a slower etch rate than that of the bulk SiO(2) , was located approximately 5 microm below the anode sur…
Activated carbon fibers (ACF) are microporous carbon consisting of a three-dimensional network of micrographites having the size of ∼3 nm. We investigate structural and electronic properties of ACFs in relation to the adsorption of helium, nitrogen, and oxygen gases, by means of adsorption isotherm, ESR (electron spin…
The reaction of [Cu(CH(3)CN)(4)](BF(4)) with 3,5-dimethyl-4-nitropyrazole (Hdmnpz) in the presence of triethylamine yields the new copper(I) complexes [Cu(dmnpz)](3) (1) and (Et(3)NH)(2)[Cu(4)(dmnpz)(6)] (2), depending on the experimental conditions. The reactivity of 1 and 2 toward neutral ligands such as triphenylph…
An extended-core liquid crystal (LC) based on the 3,3′-di(acylamino)-2,2′-bipyridine unit is investigated with respect to its behavior in alkane solvents. It is demonstrated that the lyotropic mesomorphism observed in dodecane can be tuned by varying the concentration of the sample, and the columns can be switched in…