Materials Literature
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Co(II) and Cu(II) complexes and metal-free t-butylphenyl peripherally substituted porphyrazine (Pz) have been screened for in vitro antifungal (Aspergillus niger) and antioxidant (free radical scavenging, superoxide radical scavenging, and reducing power) activities. The results were compared with synthetic antioxidan…
As a result of the application of coarse-graining procedures to describe complex fluids, the study of systems consisting of particles interacting through bounded, repulsive pair potentials has become of increasing interest in recent years. A well known example is the so-called generalized exponential model (GEM- m ),…
Abstract The free‐radical copolymerization of 2‐metil‐1‐{[(1‐{4‐[(4‐nitrobenzil)oksi]fenil}etilidene)amino]oksi}prop‐2‐en‐1‐on (NBOEMA) with methyl methacrylate (MMA) was carried out in 1,4‐dioxane at 65 ± 1°C. The copolymers were analyzed by Fourier transform infrared spectroscopy, 1 H‐NMR, 13 C‐NMR, and gel permeati…
Nanocomposites constructed from metallic nanoparticles and amphiphilic copolymers have attracted substantial interest for various potential applications. Here we report on the nanocomposites prepared through cross-linking pluronic micelles with gold nanoparticles. The covalent binding of gold nanoparticles onto the mi…
Abstract The results are presented on the synthesis of new modifiers and functioning of amine modifiers for unsaturated polyester resins, obtained by reacting ethylene oxide or propylene oxide with phenyl‐1,4‐diamine. Also the effect of the modifiers and cobalt accelerator on the reactivity of resins was studied. When…
Far-field secondary emission spectra of one-dimensional periodic photonic structures based on porous silicon show characteristic co-focal rings centered close to the structure plane normal. The rings appear when the frequency of picosecond excitation laser pulses is tuned to the edges of the fourth photonic band gap.…
We use Monte Carlo simulations in two dimensions to study the depletion forces between two hard squares in a suspension of hard rods or disks. We determine the effects of size and concentration of rods and disks on the potential of mean force between the squares. Both rods and disks produce a short-range depletion att…
In this work, we report the novel application of thermally stable photocuring chemistry toward high fidelity translation of block copolymer based melt-state morphologies into their equivalent solid analogues. The thermal stability of the cationic photcuring chemistry allows for both extended thermal processing prior t…
Abstract Oligo(3‐OH butyrate)‐β‐cyclodextrin esters (PHB‐CD) were obtained through ring opening of β‐butyrolactone (β‐BL) in the presence of β‐cyclodextrin (CD) and (‐)‐sparteine (SP) as nucleophilic activator. The resulted reaction mixture was first separated in two fractions and then investigated through a deep mass…
Fluorescence spectroscopy has been widely used to monitor different polymer processes such as polymerization kinetics, chain entanglements, and thermal transitions. The solvent-free controlled ring-opening polymerization (ROP) of lactide is significant both commercially and for research; thus, monitoring this process…
Abstract The halogen‐free flame retardant (HFFR) ethylene‐vinyl acetate copolymer (EVM)/ATH/SiO 2 composites have been prepared by melting compounding method, and the flame retardant, thermal stability, rheological, electrical, and mechanical properties have been investigated by cone calorimeter, LOI, UL‐94, TG, FE‐SE…
The behavior of superconductivity of “111”-type iron pnictide superconductors, namely, LiFeAs, NaFeAs and LiFeP, is investigated at different pressures through electrical resistance measurements. For LiFeAs and LiFeP, the superconducting transition temperature T c decreases monotonously with increasing pressure, with…
Abstract TPU was infiltrated into vertically aligned, 3.5 mm‐long MWNT forests to produce continuously reinforced anisotropic nanocomposites, and thermomechanical and electrical testing has revealed multifunctionality which shows promise for numerous applications. A 1000% increase in the storage modulus at 70 °C was o…
Accurate Debye-Waller (DW) factors and several low-index structure factors of chemically ordered β-NiAl at different temperatures have been measured using an off-zone-axis multi-beam convergent-beam electron diffraction method. The temperature dependences of DW factors of Ni and Al atoms are compared with previous exp…
Employing both multireference configuration interaction (MRCI) and density functional theory (DFT) methods, we have studied the interaction of O₂ with a tetrahedral Al₄ cluster in the total spin triplet state. For a parallel to the base approach of O₂ facing an apex of the pyramid, the O₂ adsorption is hindered by a b…
Surface relief textures fabricated in optical components can provide high performance optical functionality such as antireflection (AR), wavelength selective high reflection, and polarization filtering. At the Boulder Damage XXXIX symposium in 2007, exceptional pulsed laser damage threshold values were presented for A…
Novel propargyl-ended heterobifunctional poly(ethylene glycol) (PEG) derivatives with hydroxyl, carboxyl, mercapto or hydrazide end groups were synthesized with simplicity yet high efficiency. PEG (Mw = 3500 Da) with an α-hydroxyl group and an ω-carboxyl was used as the starting polymer. The carboxyl group of the bifu…
PURPOSE: The objectives of this in vitro study were (1) to determine whether a commercially available collagen membrane (CM) or human demineralized freeze-dried bone (DFDB) particles adversely affected viability or function in cultured osteoblasts through oxidative stress, and, if so, (2) to determine whether N-acetyl…
Phosphorus-containing flame retardants (FRs) 3,9-dihydroxy-2,4,8,10-tetraoxa-3,9-diphosphaspiro-[5.5]-undecane-3,9-dioxide (dihydroxy-TDUD), 3,9-diphenoxy-2,4,8,10-tetraoxa-3,9-diphosphaspiro-[5.5]-undecane-3,9-dioxide (diphenoxy-TDUD), hydroxymethylphenylphosphinic acid (HMPPA), 2-carboxyethylphenylphosphinic acid (C…
Surface organization and photochemistry of free-base porphyrin self-assembled monolayers (SAMs) covalently bonded to the surfaces of tapered optical fibres and reference glass plates were studied. The surface modification was carried out in two steps: (i) surface activation by aminopropyltrimethoxysilane and (ii) porp…