Materials Literature
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The process industries (specifically, energy and chemicals) are characterized by a variety of reactors and reactions to bring about successful process operations. The design of energy-related and chemical processes and their evolution is a complex process that determines the competitiveness of these industries, as wel…
Abstract In this article, we present the findings of our study into the thermal decomposition of the alga Ulva, which can cause serious problems due to its proliferation in certain seas. Its use as a human foodstuff or other similar applications is limited; however, it could be used as a filling or reinforcement mater…
Poly(N‐vinyl‐2‐pyrrolidone‐co‐crotonic acid) [P(VP/CrA)] copolymers were prepared by irradiating the ternary mixture of VP/CrA and cross‐linking agent ethylene glycol dimethacrylate (EGDMA) in water by γ‐rays at ambient temperature. The solubility parameters of these copolymers were determined by 20 solvents with vari…
Abstract The surface tension of thin, uncured epoxy films spun‐cast onto oxidized silica wafers was analyzed as a function of their thickness in the range of 5 to 75 nm. Based on contact angle measurements with polar and apolar liquids, the surface free energies of various films were analyzed and compared using Lifshi…
We present an investigation into electromechanical coupling in carbon nanotubes by focusing on phonon frequency shifts as a result of charge injection. A nearest-neighbor, tight-binding theoretical model is accompanied by a computational explication carried out using the Vienna ab initio simulation package density fun…
Linear and nonlinear optical susceptibilities of poled guest−host polymer systems are calculated, using structures simulated by molecular dynamics. Three systems are investigated, each consisting of a poly(methyl methacrylate) (PMMA) matrix and doped with either of the one-dimensional nonlinear optical (NLO) chromopho…
Abstract The chemical grafting of polyaniline, poly( o ‐anisidine), and poly( o ‐toluidine) on polyester fabric was carried out with ammonium peroxodisulfate in an acidic medium. The formation of the grafted fabric substrate was confirmed with reflectance spectroscopy, Fourier transform infrared spectroscopy, weight‐l…
The strength of the interfacial interactions and the length scale over which these interactions occur are key factors in understanding the thin film behavior of polymer blends and diblock copolymers, adhesion, wettability, and recognition processes of cells and random heteropolymers on surfaces. Here, gradient heterog…
The purpose of this paper is to study the effect of methacrylated polyhedralsilsesquioxanes (POSS) on the fracture toughness of poly(methyl methacrylate) (PMMA) based denture‐based resins. POSS is a nanostructured material, that is, known to reinforce polymeric systems. Previous work has shown that POSS can improve th…
This work reports on a recent advancement in three-dimensional dislocation dynamics modelling. A method is presented for the treatment of dislocation image stresses resulting from the presence of nearby traction-free surfaces. The image stress-field of a dislocation segment below a finite-sized free surface is obtaine…
RATIONALE AND OBJECTIVES: Monochromatic quantitative computed tomography allows a nondestructive and quantitative measurement of gadolinium (Gd) concentration. This technique was used in the C6 rat glioma model to compare gadopentetate dimeglumine and gadobutrol. METHODS: Rats bearing late-stage gliomas received 2.5 m…
A “simple” catalyst of TaBr 5, NbBr 5, or NbBr 3 ·CH 3 O(CH 2 ) 2 OCH 3 is developed, which readily effects polycyclotrimerizations of α,ω-alkenediynes {HC⋮C(CH 2 ) m C⋮CH, m = 4−6 [ 1 ( m )]} at room temperature, giving hyperbranched poly(alkenephenylene)s [ hb -P 1 ( m )] with high molecular weights ( M w up to ∼270…
Commercially pure nickel-titanium powders were mechanically milled in a vertical attritor mill under protective atmosphere for various times from 10 to 24 hr. Products were then compacted and sintered at different temperatures for different times. Amorphization and interatomic phase formation were determined by X-ray…
Picolyl hydrazide ligands have two potentially bridging functional groups (micro-O, micro-N-N) and consequently can exist in different coordination conformers, both of which form spin-coupled polynuclear coordination complexes, with quite different magnetic properties. The complex [Cu(2)(POAP-H)Br(3)(H(2)O)] (1) invol…
The dynamics of ultrasound-induced cavitation bubbles situated in non-Newtonian liquids and near a rigid boundary are investigated experimentally by acoustic measurements and high-speed photography with up to 4 million frames/s. The non-Newtonian liquids consist of a 0.5% polyacrylamide (PAM) aqueous solution with a s…
Single-walled carbon nanotubes (SWNTs) were coated with silica by treating a mixture of a basic sodium silicate solution and a surfactant-stabilized suspension of SWNTs with EtOH. The SiO2−SWNTs were cast on solid substrates to form woven mats comprising a variety of unique nanostructures including loops, curls, inter…
An investigation of the ultrafast excited state dynamics of triporphyrin and hexaporphyrin arrays consisting of covalently linked Zn tetraphenylporphine (ZnTPP) and free base tetraphenylporphine (FbTPP) units is reported. The interchromophoric distance in the hexamers is of the order of 13 Å, while it varies from 26 t…
Abstract Potential and limits of dynamic mechanical analysis (DMA) as a tool for fracture resistance evaluation of isotactic polypropylenes and their polyolefin blends are presented. A minimum of information about the materials under investigation is a prerequisite to interpret the DMA traces in a right way. Although…
Formation and aggregation of photolytic gold nanoparticles at the surface of chitosan (CTO) films have been investigated. When thin films of chloroauric acid salt of CTO were irradiated with UV light in wet air at room temperature for 10 min, gold nanoparticles of approximately 10 nm size are formed at the film surfac…
Abstract A series of new polyimides was prepared by reacting 2,6‐diaminopyridine with various aromatic dianhydrides in DMF in 1 : 1 mole ratio. All the resulting polyimides were readily soluble in organic solvents such as dimethylformamide, N,N ‐dimethylacetamide, pyridine, m ‐cresol, THF, etc. They also show good fil…