Materials Literature
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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…
multifunctionalized applications. The application of conducting polymers for the direct conversion of electrical energy to mechanical energy in electro-mechanical actuators is analyzed using theoretical and experimental results. Electrically conducting organic polymers and a novel class of synthetic that combine the c…
Diaminotriazines are known to self-associate in solution, in the solid state, and on surfaces via characteristic hydrogen bonding motifs. Although complementary hydrogen bonding between diaminotriazine derivatives and carboxylic acids has been shown to induce mesomorphic properties, the hydrogen-bonded self-associatio…
Cellulose acetate, cellulose nitrate, polyamide, polyethersulfone and polypropylene membranes have been used as templates in which sol–gel chemistry was conducted to fabricate porous metal oxide films. Dilution of the metal alkoxide solution allowed for variation in the total amount of inorganic deposited per membrane…
The 1∶2 complex of α-D-glucose and p-tolylboronic acid (1) crystallizes in α-glucofuranose form at room temperature in P212121 space group with one molecule in the asymmetric unit (Z′ = 1). Data collection at 100 K afforded a modulated structure in P21 space group and Z′ = 2. Interestingly, C–H⋯O interactions are show…
Five malonate-containing copper(II) compounds of formula {[A(H2O)n]2 [Cu(mal)2(H2O)m]} [A = Li (1), Na (2), K (3), Rb (4) and Cs (5); H2mal = malonic acid] have been synthetized and characterized by X-ray diffraction. The structure of these compounds consists of bis(malonate)cuprate(II) anions and alkaline cations tha…
A series of novel dendrons serving as surfactants for surface modification of montmorillonite (MMT) have been synthesised via a convergent approach. The most distinguishing characteristic of the prepared dendrons is the long alkyl chain at the periphery. This would certainly bring about good solubility, high yield and…
A polyglycerol with dendritic structure (PGLD) was synthesized by ring-opening polymerization of deprotonated glycidol using a polyglycerol as core functionality in a step-growth process. Then, PGLD reacted with O-carboxymethylated chitosan to obtain PGLD-chitosan dendrimer (PGLD-Ch). After the reaction of PGLD-Ch wit…
Examination of fracture toughness has been performed a commercial Mg-Zn-Zr alloy, ZK60, with fine strengthening particles. The commercial alloy was extruded at 633 K, and then heat treated at specific conditions. The microstructures were equi-axed grains, and average grain size and precipitate size were 11.6 μm and 50…