Materials Literature
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Perhydropolysilazane (PHPS) films ca. 0.2 μm in thickness were deposited by spin-coating on Si(100) and silica glass substrates. The PHPS films obtained were suspended over aqueous ammonia of various concentrations for various periods of time at room temperature. The Si-H and N-H infrared absorption peaks decreased, w…
We report the synthesis and self-assembly of a new pi-conjugated dichalcone substituted carbazole-based low molecular mass organogelator. It could form stable gels in most halogen-aromatic solvents. The transmission electron microscopy (TEM) images revealed that the gel formed fibrous structures with diameter of 50-10…
The electrochemical oxidation of the aniline dimers 2-aminodiphenylamine (2-adpa) and 4-aminodiphenylamine (4-adpa) has been performed in strongly acidic medium on platinum, graphite, and indium tin oxide electrodes. The resulting films have been characterized by a number of electrochemical, microscopic, and spectrosc…
The controlled oxidation at only one position of compounds with several oxidizable sites, while keeping the other sites intact, has been demonstrated for phenols bearing alcohol or olefinic functional groups. Iron tetrasulfophthalocyanine supported on silica was found to be an efficient catalyst for the preparation of…
We report here the preparation of PEO-b-P2VPH+-S2O8(2-) micelles and their reversible multi-responsive behavior.
The optical properties of BaAl 2 S 4 doped with Eu 2 + were investigated. The synthesis was performed in evacuated and sealed quartz ampul at 1000°C during 1 h, then at 840°C during 20 h. With absorption, excitation, and emission spectra we have determined the crystal-field splitting, the redshift, the influence of th…
The precipitation processes in a Cu–0.9 mass%Be alloy single crystal containing only G.P. zones parallel to the matrix (001)α plane have been studied by high-resolution transmission electron microscopy. The precipitation sequence found is: G.P. zones→γ″→γ′I→γI+γ′→γ. The γ″ phase has a two-layer structure of Be atoms s…
Here we report the formation of stimulus-responsive chemically end-grafted "brush-brushes" by synthesizing, mono thiol(end)-functionalized poly(methacrylic acid--ethylene glycol) or poly(MAA--EG) comb-type graft copolymers a combination of protecting group chemistry and atom transfer radical polymerization using the i…
Enhancing the diffraction efficiency of continuous-relief diffractive optical elements fabricated by direct laser writing is discussed. A new method of zone-boundary optimization is proposed to correct exposure data only in narrow areas along the boundaries of diffractive zones. The optimization decreases the loss of…
AZ31 magnesium alloys were galvanostatically anodized in an alkaline solution without and with the addition of phosphate and fluoride ions. The microstructure and composition of the anodic film were investigated using cross-sectional transmission electron microscopy. Results show that during anodizing at in the KOH so…
A series of ordered periodic mesoporous organosilicas (PMOs) with cubic and hexagonal symmetry was synthesized from organosilica precursor 1,2-bis(triethoxysilyl)ethane (BTEE) by using cationic surfactants [CH3(CH2)17NMe3]+Br− (C18TABr) or [CH3(CH2)17NMe2(CH2)3NMe3]2+2Br− (C18-3-1) or binary mixtures herefrom as struc…
The dissolution rate and Cu surface enrichment of sputter-deposited Al 2 Cu Mg thin films exposed to 0.5 M NaCl solutions and chromate conversion coating solutions has been characterized. Dissolution rates were measured using an electrochemical quartz crystal microbalance, and Cu surface enrichment was characterized b…
Processes for fabricating ceramic microstructures are in demand for use in areas such as microreactors and MEMS that can be used in harsh environments requiring a high temperatures tolerance, corrosion resistance, as well as tribological properties. This review describes the manufacture of tailored porous SiC ceramic…
The electrochemical hydrogenation properties of two boron-free crystalline Co powder samples were investigated. They exhibited almost the same maximum discharge capacities with 2-h charging, 415 and (corresponding to and ) for samples A and B, respectively. The high discharge capacity of Co powder was attributed to hy…
The present work demonstrates a simple two-phase thermal method to prepare oriented boehmite [AlO(OH)] membranes directly from anodic alumina oxide (AAO) substrate with a copper catalyst. The acidity of the aqueous phase and reaction time play important roles in the formation of the oriented AlO(OH) membranes. Closely…
New processable, electroactive, alternate copolymers consisting of dialkylbithiophene units and oligoanilinethiophene units have been prepared by post-polymerization functionalization of a specially prepared precursor polymer, namely poly[(4,4″-dioctyl-2,2′∶5′,2″-terthiophene-3′-yl)ethyl acetate], carried out via its…
Using atomistic computer simulations, we study the adsorption of different globular protein fragments with different secondary structures on the surface of a hydrophilic glassy polymer, poly(vinyl alcohol), or PVA, and compare the results with our earlier calculations on hydrophobic graphite. The simulations were main…
This article discusses the importance of the endothelium for successful vascular grafts derived from both native arteries and synthetic materials. It also discusses the fundamental strategies to endothelialize synthetic grafts in animal experiments and in the clinic, as well as the use of endothelial progenitor cells…
Nanocrystals with tunable morphologies and optical properties were successfully fabricated from an organic functional low-molecular-weight compound, 2,4,5-triphenylimidazole (lophine), through a sonication technique.
The isothermal degradation kinetics of vitamins in stored and heated foods can be described by the Weibullianâpower law model, C(t)/C0=exp[âb(T)tn] and the temperature dependence of b(T) by the log logistic equation, b(T)=elog{1+exp[k(TâTc)]}. The resulting three degradation parameters, n, Tc and k, can be used…