Materials Literature
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The nature and stability of end-member illite (I), K 0.88±0.01 /O 10 (OH) 2 , a K-deficient mica, has been a subject of much controversy. Evidence for the metastability of “illite” with respect to ideal muscovite (Ms) + pyrophyllite (Py) has been discussed in the literature but conflicting evidence from studies of nat…
Chromate conversion coating (CCC) formation and breakdown was examined using 25 element Al wire electrode arrays. Arrays were interrogated using a multichannel analyzer capable of separately recording currents from each electrode. During CCC formation, electrodes exhibited a 30 s period of intense electrochemical acti…
The perovskite compounds Ca1 − xSrxTiO3 (0 ≤ x ≤ 1) have been studied by Raman spectrometry at room temperature. Following the intensity of selected bands, we have confirmed the sequence of phase transitions with increasing Sr content from orthorhombic Pbnm through tetragonal I4/mcm to cubic, and the phase boundaries…
Abstract The angular distribution of photons scattered by healthy (adipose and glandular) and cancerous human breast tissue and by tissue‐equivalent materials were measured for photon energies of 17.44 keV (Kα radiation of Mo) and 6.93 keV (Kα radiation of Co) using an x‐ray tube equipped with a graphite monochromator…
A novel Fourier transform infrared (FT-IR) microspectroscopy equipped with a micro hot stage (thermal FT-IR microscopic system) was used to quickly study the phase transformation of acetaminophen polymorphs by a one-step process. Acetaminophen was sealed in KBr disc on the first and second heating processes under this…
Thermal agglomeration of an ultrathin Si layer in silicon-on-insulator structures with a thickness ranging from 1 to 15 nm has been studied by atomic force microscopy. We found that the size of Si islands formed by agglomeration depends on the initial thickness of the Si layer, i.e., the height and the lateral size of…
Two new oligomeric types of toroidal nickel(II) monothiolate ring systems, cyclo-[Ni(SPh)2]11 (1) and cyclo-[Ni(SPh)2]9 (2), containing heretofore unknown 11-membered (n = 11) and 9-membered (n = 9) ring-geometries, respectively, are reported. Our initial isolation of 1 was as an unexpected by-product that resulted fr…
The resistivities of thin films and fine lines of copper (Cu) and aluminum (Al) were measured by a resistance ratio method (referred to as “RR method” hereafter), which measures the ratio of room-temperature resistance to liquid-nitrogen-temperature resistance. This method can predict resistivity exactly without the n…
The sequence of the celO gene from Clostridium thermocellum F7 was determined. The gene product, cellulase CelO (Ct-Cel5F), had a modular structure consisting of a carbohydrate-binding module of the CBM3 family and a catalytic domain of the glycosyl hydrolase family 5. The presence of the dockerin module indicated tha…
The polymorphism of 4-cyano-4′-pentylbiphenyl (5CB) was investigated by means of differential scanning calorimetry (DSC), X-ray diffraction, and proton nuclear magnetic resonance (NMR) experiments. Three new phases has been identified and characterized structurally and dynamically. By a slow cooling at a rate ≤ 0.2 K/…
The aim of the present paper is to investigate the combined effect of mold material and binder for investment casting of titanium and titanium alloys. A plasma arc melting furnace was used for melting titanium alloy, and the interfacial reaction of titanium castings was determined by optical microscope, SEM, EDS analy…
The deposition of silicon alloys for protective and optical coatings on polymers is of increasing interest. The understanding of the plasma polymer interaction is of prime importance here. In this work, we report a study of the influence of N2, H2, and O2 plasma treatments on pure and commercial grade polycarbonate (P…
Various factors that influence the appearance of a tetragonal (t-) ZrO2 polymorph at room temperature have been extensively investigated. Several proposed models emphasize the role of anionic impurities (SO42-, OH-), crystallite size (surface energy), structural similarities between the starting material and t-ZrO2, l…
The thermal expansion of CeO2 and rare-earth-doped ceria (Ce0.8R0.2O1.9, R: Yb, Y, Gd, Sm, Nd and La) was measured in the temperature range from 298 to 1473 K. The coefficients of thermal expansion (CTE) were determined by differentiating the thermal expansion expressed by a polynominal equation of temperature with re…
Single crystals of [Ln(2,2′-bipyridine-1,1′-dioxide)4](ClO4)3 (Ln = Nd, Lu) have been obtained and the crystal structures determined. By comparison with previous structural determinations, it is demonstrated that steric crowding associated with the decreasing lanthanide ions radius causes changes of the angles between…
The development of emissive lanthanide complexes as structural or reactive probes to signal changes in their local chiral or ionic environment has been inhibited by the lack of understanding of correlating structural and electronic spectral information. The definition of relatively rigid enantiopure macrocyclic lantha…
Diaminopyridine-functionalized polyhedral oligomeric silsequioxanes (POSS-DAP) self-assemble with complementary thymine-functionalized Au nanoparticles (Thy-Au) into well-defined spherical aggregates, providing highly structured nanocomposites.
Oscillatory thermocapillary convection in an open cylindrical annulus heated from the inside wall is investigated numerically. Results for aspect ratio of 1 and Prandtl number of 30 are obtained to compare the simulations with available space experiments. The influence of surface heat loss as quantified by a Biot numb…
The mechanical properties of InSe and GaSe single crystals have been studied by means of nanoindentation tests. Both bulk crystals are well ordered and present a predominant γ-type interlayer stacking sequence as determined by x-ray diffraction and transmission electron microscopy measurements. The course of plastic d…
Two polymorphs and three solvates of fluconazole were isolated and characterized by x-ray powder diffractometry, IR spectroscopy, differential scanning calorimetry (DSC), thermogravimetry, and their dissolution rates. The different forms were prepared by crystallization of the original powder in different solvents at…