Materials Literature
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Titanium dioxide has been extensively studied in recent decades for its important photocatalytic application in environmental purification. The search for a method to narrow the optical band-gap of TiO2 plays a key role for enhancing its photocatalytic application. The optical band gap of epitaxial rutile and anatase…
The structures and phase transitions of AgNbO 3 were investigated using neutron powder diffraction and restricted single-crystal x-ray diffraction. Both methods have revealed the high temperature M 3 –O 1 , O 2 –T and T–C phase transitions but have not given any significant evidence of low temperature M 1 –M 2 and M 2…
A biaxial nematic phase had been predicted with D(2h) symmetry, wherein the mesogen's long and short transverse axes are simultaneously aligned along the two orthogonal, primary and secondary directors, n and m, respectively. The unique low-angle x-ray diffraction patterns in the nematic phases exhibited by three rigi…
We have synthesized liquid crystal (LC) mesogens based on a nonlinear oxadiazole unit that exhibit nematic phases near 200 degrees C. Polarized microscopy and conoscopy indicate that these LCs are biaxial nematics. Unambiguous and quantitative evidence for biaxiality is achieved using 2H NMR spectroscopy. "2D powder"…
Abstract Efforts to evaluate interlayer adhesion of coextruded films are often hampered by the inability to initiate delamination. On the other hand, interlayer delamination was often noticed at cut or trimmed edges of coextruded films. In this study, a test method was developed by first initiating delamination by uni…
Abstract The adhesion mechanism between polyimides and aromatic thermosetting copolyester (ATSP) involved in the solid‐state bonding technique using submicrometer ATSP coatings was evaluated. The adhesion strength at the interface between ATSP and polyimide is strongly related to the diffusion of ATSP into the polyimi…
Electric arc furnace dust (EAFD), generated by the steel-making industry, is in itself an intrinsic hazardous waste; however, the case may also be that scrap used in the process is accidentally contaminated by radioactive elements such as cesium. In this case the resulting EAFD is to be handled as radioactive waste, b…
Abstract A series of biodegradable amphiphilic A‐B‐A type triblock copolymers P(BLA‐PEG‐BLA), composed of hydrophilic poly(ethylene glycol) (PEG) as a middle block component (B) and hydrophobic poly(β‐benzyl‐ L ‐aspartate) as outer polypeptide block components (A), were synthesized by copolymerization of β‐benzyl‐ L ‐…
The growth-starting supercooling Δ T G, defined as a supercooling at which a crystal starts to grow on cooling, was measured for the (100) face of a potassium dihydrogen phosphate (KDP) crystal on which an Al (III) impurity had been adsorbed beforehand. When adsorption was made onto the nongrowing (100) face at a low…
The effect of stoichiometric reaction conditions on CaCO 3 crystallization was investigated using a Ca(OH) 2 −H 2 CO 3 reaction system in which the influence of ionic byproducts on the crystallization was effectively excluded. The largest rhombohedron-like crystals were produced under stoichiometic reaction conditions…
Abstract A new colloidal silver system is presented in which a fine colloidal silver is in situ deposited onto functionalized porous poly(ethylene glycol dimethacrylate) [poly(EGDMA)] microspheres. The effectiveness of the silver deposition has been investigated through an examination of the surface characteristics of…
Abstract Polyethylene–poly(dimethylsiloxane) copolymers were synthesized in solution from an ethylene monomer and an ω‐vinyl poly(dimethylsiloxane) (PDMS) macromonomer at 363 and 383 K with EtInd 2 ZrCl 2 /methylaluminoxane as a catalyst. The copolymers obtained were characterized with Fourier transform infrared spect…
Abstract The nanocomposite of epoxy resin/tung oil anhydride/organic montmorillonite was prepared by casting and curing. The distance of the clay gallery rose and the exfoliated nanocomposite was formed. The exfoliation behaviors of the nanocomposite had been investigated by X‐ray diffraction (XRD). The curing mechani…
Abstract X‐ray photoelectron spectroscopy (XPS) was used to study the hydrolytic aging of polypropylene according to the pHs of degrading buffer solutions and the time of aging. The study was concentrated over periods of 3, 6, and 9 months for values of pH close to the real environments of use of the material (pH of 6…
We revisit the problem of semiflexible chain condensation by neutral depleting agents (e.g., colloidal spheres or flexible polymers) by using a simple formalism that allows us to address its main features without specifying the kind of depleting agents. Correlations between depleting agents are shown to produce a resw…
The structures, magnetism, and electronic transport properties of (La 1+ x Sr 1 - x )CoRuO 6 (−0.50 ≤ x ≤ 0.25) double perovskites have been investigated. All samples are found to crystallize with the monoclinic P 2 1 / n superstructure. An increase of antisite disorder with | x | is found to be controlled by a reduct…
We have designed a new type of fluorescent nanosensors through the preparation of organic luminescent nanocrystals grown in sol−gel films prepared by spin-coating. These nanosensors exhibit low cost preparation and easy nanocrystal functionalizations with the possibility to involve typical molecular probes while the s…
Abstract The formation and characterization of some interpolyelectrolyte complex (IPEC) nanoparticles based on poly(sodium 2‐acrylamido‐2‐methylpropanesulfonate) (NaPAMPS), as a function of the polycation structure, polyanion molar mass, and polyion concentration, were followed in this work. Poly(diallyldimethylammoni…
Abstract The crosslinking reaction of low‐density polyethylene with vinyl triethoxysilane was studied in great detail. The effects of a wide range of concentrations (0–27.33 phr silane and 0–1.25 phr benzoyl peroxide) on the mechanical properties, hot‐set testing, gel contents, and burning behaviors of the resulting c…
A new technique to produce very small magnetic nanoparticles of maghemite (γ-Fe 2 O 3 ) is presented. The particles form and precipitate in the presence of the oligosaccharide γ-cyclodextrin and in the final product remain entrapped in tiny pseudo-single crystals of the organic host. Evidence of nanosized particles em…