Materials Literature
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We investigate effects of cation (K, Ca, Sr, Ba, La, Bi, Tl, Ag) substitution at Pb-site in $\mathrm{Pb}{\mathrm{Fe}}_{1∕2}{\mathrm{Nb}}_{1∕2}{\mathrm{O}}_{3}$ (PFN) on its diffuse ferroelectric phase transition (DPT) through measurements and modeling of the temperature dependence of its dielectric constant. We find t…
A liquid crystal (LC) negative lens is realized using a two-voltage-driving system. The focal length of the lens is tuned electrically. The properties of the lens are calculated and measured. The LC lens has a very wide focus range, and it preserves its optical quality over the entire range.
Abstract A spin crossover (SC) FeIII complex, [FeIII(4-NH2py)L]BPh4, was synthesized and characterized, where 4-NH2py = 4-aminopyridine, H2L = pentadentate N3O2 Schiff-base ligand of the 2:1 condensation product of 3-methoxysalicylaldehyde and bis(3-aminopropyl)methylamine, and BPh4− = tetraphenylborate. Cryomagnetic…
Segregation of alloying and impurity elements to grain boundaries in ferritic steels and alloys is known to modify the mechanical properties. This paper considers segregation of such elements, in particular phosphorus and carbon, that occur in ferritic nuclear pressure vessel steels subject to neutron irradiation and…
Cobalt (4) and iron (5) phenylthio-substituted phthalocyanines ( MPc ( SR ) 8 ) have been synthesized and characterized. Cyclic square wave voltammetry in dimethylformamide containing tetrabutylammonium perchlorate revealed five and six redox processes, respectively, for complexes 4 and 5. The complexes are easier to…
There is a growing consensus that materials become stronger in small volumes and in the presence of large strain gradients. It has not been clear whether this is due to increased resistance to the motion of dislocations, fewer dislocations, or increased difficulty of multiplying dislocations in these situations. A cla…
Super high modulus polyethylene fibers can be created by converting high molecular weight flexible PE chains into highly oriented and extended chain conformations. However, unlike polyethylene, aliphatic polyamides have very high cohesive energy and therefore cannot be easily drawn and highly oriented. This review add…
This paper reports some of our initial works in pursuit of a simple and low-cost method of fabricating all-organic electrochemical diodes, triodes, and transistors on flexible plastic or paper substrates. Conducting polymer poly(3,4-ethylenedioxythiophene) poly(styrene sulfonate) (PEDOT : PSS), utilized as an active c…
An aqueous extract of the plant material rhizome (Curcuma longa L.) powder has been used as a corrosion inhibitor in controlling corrosion of carbon steel immersed in an aqueous solution containing 60 ppm of Cl–, by the mass-loss method, in the absence and presence of Zn2+. The main constituent of this plant extract i…
Both diethylenetriaminepentaacetic acid (DTPA) and sulfadiazine (SD) were incorporated into polyaspartamides with different side chains, including poly-alpha,beta-[N-(2-hydroxyethyl)-L-aspartamide] (PHEA), poly-alpha,beta-[N- (3-hydroxypropyl)-L-aspartamide] (PHPA), poly-alpha,beta-[N-(2-aminoethy1)-L-aspartamide] (PA…
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Optically transparent, crack-free mesoporous titania and zirconia-doped titania thin films were fabricated by the sol—gel technique using the non-ionic amphiphilic triblock copolymer Pluronic P123 as the template. The structure and optical properties of these films were characterized using TEM, low-angle XRD, DTA/TG m…
Composites, in film form, containing physiologically clotted fibrin, chitosan and gelatin were prepared and crosslinked with glutaraldehyde. The films were characterised for their IR spectroscopy, water absorption capacity (WAC) at different pH conditions, mechanical properties and scanning electron microscopy (SEM).…
Deposition of $1000\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$ pure carbon ions onto Si(001) held at $800\phantom{\rule{0.2em}{0ex}}\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}$ led to direct nucleation of diamond crystallites, as proven by high-resolution transmission electron microscopy and electron energy loss spectro…
The market for piezoceramic components is dominated by lead zirconate titanate (PZT) materials containing more than 60 wt% lead. Since lead is a toxic heavy metal, it has become a great concern how to eliminate the use of PZT by replacing it by non-harmful materials while maintaining comparable piezoelectric propertie…
We have investigated the control of crystal orientation in misfit-type layered cobaltite Ca 3 Co 4 O 9 thin films by rf-planar magnetron sputtering and succeeded in growing epitaxial films with c -axis, a -axis and b -axis orientations normal to the substrate. Anisotropic transport properties (parallel to the CoO 2 la…
The crystal structure of the chabazite K with the formula (K1.33Na1.02Ca0.84)[Al4Si8O24] · 12.17H2O from late hydrothermalites in the Khibiny alkaline massif (Kola Peninsula) is established by X-ray diffraction analysis (CAD4 four-circle diffractometer, λMoK α radiation, graphite monochromator, T=193 K, 2θmax = 70°, R…
The adhesion of spheroidal particles to spherical drops is calculated and discussed in terms of an equilibrium-penetration index. The present study emphasizes the case of particles that are sufficiently large to affect the drop volume upon penetration. It is shown that the more elongated the particles, the steeper the…
Changes in color parameters with increasing temperatures over the range of 20 to 700 °C were studied in samples from the uppermost surface layer of the A horizon of various typical Mediterranean soils. Because changes in soil color during heating relate to the formation of Fe hydrous oxides species (such as maghemite…
Thermal conductivity images of thermal barrier coatings are measured using time‐domain thermoreflectance at a single delay time with micron‐scale resolution. We find that the thermal conductivity of electron‐beam physical vapor deposited 8 wt% yttria‐stablized zirconia coatings for heat flow along both the through‐thi…