Materials Literature
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Three variations on a classroom demonstration of the encapsulation of droplets and evidence for release of the interior solution are described. The first two demonstrations mimic biocompatible applications of encapsulation. Reversible formation of capsules from aqueous solutions of sodium alginate, a negatively charge…
Abstract The sequence of differentiation of the epidermis of scutes during embryogenesis in the tortoise Testudo hermanni was studied using autoradiography, electron microscopy and immunocytochemistry. The study was mainly conducted on the epidermis of the carapace, plastron and nail. Epidermal differentiation resembl…
Abstract The diametral expansion and elongation rates of Zr-2.5Nb pressure tubes in CANDU™ (CANada Deuterium Uranium) nuclear reactors are important properties that limit their useful life and the maximum power level for reactor operation. For a given set of operating conditions there is considerable variability in th…
A series of thermotropic liquid crystalline polyphosphates, containing photochromic molecules of stilbene in the backbone and substituted azobenzene in the side chain, were synthesized respectively. The inherent viscosity measurements were determined for all the polymers. The stability and char yield, Tg, Tm and Ti we…
A method to automatically create low order state-space models for magnetic devices is set forth. The method begins with geometrical and materials data from which the finite element analysis (FEA) is used to build a high order state-space model. It is shown that this model contains far more state variables than are nec…
The electronic structures of D(4h)-M(2)(O(2)CH)(4) and the oxalate-bridged complexes D(2h)-[(HCO(2))(3)M(2)](2)(mu-O(2)CCO(2)) and D(4h)-[(HCO(2))(2)M(2)](4)(mu-O(2)CCO(2))(4) have been investigated by a symmetry analysis of their MM and oxalate-based frontier orbitals, as well as by electronic structure calculations…
Molten salt synthesis (MSS) of ceramics is an alternative to sol-gel and ceramic methods. Phase purity, as well as particle shape and size, may be effectively controlled by MSS. In the present study, magnetoelectric Aurivillius phase Bi5Ti3FeO15 is obtained by MSS. Experimental setting for reaction control is describe…
Frage der Orientierung: Bei der Selbstorganisation eines frei rotierenden Dialkinyl-verbrückten Zink(pyridylporphyrin)-Dimers entsteht bevorzugt das cyclische Tetramer, in dem das orthogonale Konformer (⊥) vorliegt, und nicht das üblichere planare Konformer ( // , siehe Bild). Der Grund für dieses Verhalten ist wahrsc…
The growth of MnF2 and ZnF2 layers on Si(001) and Si(111) substrates was studied by molecular-beam epitaxy. Calcium fluoride buffer layers with (001), (110), and (111) orientations were used to prevent chemical interaction of MnF2 and ZnF2 molecules with the Si substrate. The analysis of x-ray and reflection high-ener…
The diffraction characteristics of a volume grating (VG) illuminated by a three-dimensional (3-D) converging-diverging Gaussian beam at conical incidence are investigated by applying 3-D finite-beam (FB) rigorous coupled-wave analysis (RCWA) based on the conventional 3-D RCWA in conjunction with two-dimensional plane-…
This article presents the performance of ultra-high-strain single-crystal piezoelectric stacked actuators using the composition Pb(Mg1∕3Nb2∕3)-32%PbTiO3 (PMN-32%PT)for adaptive structures (in particular for space-based applications). Generally, dimensionally adaptive or smart structures often utilize piezoelectric act…
Gold nanoparticles were prepared by the reduction of HAuCl4 using NaBH4 as reducing agent in a water‐in‐oil reverse micelles system, in which gemini surfactant 2‐hydroxy‐1, 3‐bis(octadecyldimethylammonium) propane dibromide (18‐3(OH)‐18) was used as stabilizer. The results of TEM and AFM show that the gold nanoparticl…
Estudos sobre cinética de liberação de K e Mg permitem uma melhor compreensão da dinâmica desses nutrientes no solo e podem fornecer subsídios para adequação das recomendações de adubação e aumentar a produção das plantas. A seleção do local de amostragem foi definida com base nas diferenças entre os materiais de orig…
Abstract Fluorinated cyclotriphosphazene is selected as a novel flame-retarding additive in the electrolyte for lithium-ion batteries. The effect of the phosphazenes on the thermal stability of LiCoO2 cathode has been investigated by the thermal analyses on charged LiCoO2 electrodes in the presence of the electrolyte…
Abstract Prior work has shown that oat ( Avena sativa ) seeds are a rich source of peroxygenase, an enzyme that promotes the oxidation of carbon‐carbon double bonds to form epoxides. Ground and defatted oat seeds were used as a low‐cost source of peroxygenase. A systematic study of the epoxidation of i ‐butyl amides f…
Ceramics of (1 − x)BaTiO3−xLa(Mg1/2Ti1/2)O3 series (x = 0, 0.025, 0.05, 0.075 and 0.1) were dielectrically investigated. Based on the dielectric and X-ray diffraction data, phase diagram of the system for the studied composition range has been determined. Apparent relaxor behavior was revealed to set in when the BaTiO…
Large Third-Order Optical Nonlinearities of a Croconium Dye in Tetrahydrofuran Solution and in Poly(methyl methacrylate) Coating Films Measured Using Resonant Femtosecond Degenerate Four-Wave Mixing Technique, Li, Zhongyu, Jin, Zhao-hui, Kasatani, Kazuo, Okamoto, Hiroaki, Takenaka, Shunsuke
The crystallization behavior of poly(trimethylene terephthalate (PTT) in compatibilized and uncompatibilized PTT/polycarbonate (PC) blends are investigated in the research reported in this paper. The differential scanning calorimetry (DSC) results showed that the crystallization behaviors of PTT/PC blends were very se…
The present work investigates the structure of large polystyrene (PS) chains in solutions of small poly(ethyl methacrylate) (PEMA) microgel particles in toluene. Toluene is a good solvent for the PS chains. The PEMA colloids have an outer radius of R=11 nm which is much smaller in size than the radius of gyration Rg=5…
We describe time-of-flight secondary ion mass spectrometry (SIMS), depth profiling, and atomic force microscopy studies of nanoporous silica (NPS) ultralow-k (ULK) dielectric films after C4F8∕90% Ar plasma etching. The goal of this work was to establish the role of materials chemistry and porosity on determining the c…