Materials Literature
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This work considers the physics of a brush formed by polymers capable of undergoing a helix-coil transition. A self-consistent field approximation for strongly stretched polymer chains is used in combination with a lattice model of the interaction energy in helix-coil mixtures. Crowding-induced chain stretching stabil…
The complexes FeL(2) [L = bidentate Schiff base ligands obtained from (R)-(+)-α-phenylethanamine and 4-substituted salicylaldehydes, substituent R = H, (t)Bu, NO(2), OMe, CN, OH] react with ditopic proligands 1,4-pyrazine (pz) or 4,4'-bipyridine (bpy), to give a family of optically pure Fe(II) polymeric chain complexe…
Perfluorocarbon thin films and polymer brushes were formed on stainless steel 316 L (SS316L) to control the surface properties of the metal oxide. Substrates modified with the films were characterized using diffuse reflectance infrared Fourier transform spectroscopy (DRIFT), contact angle analysis, atomic force micros…
The optical response of growing silver thin films undergoes a transition dominated by three distinct plasmonic modes, two localized and one delocalized. Their admix as a function of added mass is analysed. The onset of the delocalized or Drude mode occurs before the sharp electrical percolation transition so optically…
A hierarchy of electronic structure calculations, scalings, and fittings were used to develop an analytic intermolecular potential for dimethyl methylphosphonate (DMMP) interacting with the TiO 2 rutile (110) surface. The MP2/aug-cc-pVDZ (6-311+G** for Ti) level of theory, with basis set superposition error (BSSE) cor…
Protein multilayers, consisting of cytochrome c (cyt c) and poly(aniline sulfonic acid) (PASA), are investigated by electrochemical quartz crystal microbalance with dissipation monitoring (E-QCM-D). This technique reveals that a four-bilayer assembly has rather rigid properties. A thickness of 16.3 ± 0.8 nm is calcula…
Aqueous solutions of nano lithium silicates with 5.5/1.0 and 7.5/1.0 silica/alkali molar ratios were used to impregnate Pinus radiata. To obtain these impregnants, a solution of 3.5/1.0 SiO 2 /Li 2 O molar ratio was used; this ratio was increased with nanosilica solution. The impregnations were realized using Bethell…
The exponential increase in genome sequencing output has led to the accumulation of thousands of predicted genes lacking a proper functional annotation. Among this mass of hypothetical proteins, enzymes catalyzing new reactions or using novel ways to catalyze already known reactions might still wait to be identified.…
Extremely high gas sensing properties of p-type few layer graphene flakes exfoliated from highly oriented pyrolytic graphite have been demonstrated. The current response to ammonia adsorption is strongly dependent on film thickness and is higher than that for graphene by 1-8 orders of magnitude. A maximal response was…
We demonstrate that hydrophobic areas formed by femtosecond laser irradiation on poly(methyl methacrylate) (PMMA) and polystyrene (PS) polymer substrates can be faithfully replicated on samples of the same material via a solvent-resistant perfluoropolyether (PFPE) elastomer mold. The replicated PMMA and PS samples sho…
We use metamaterials with extreme anisotropy to solve the fundamental problem of light transport in deep subwavelength apertures. By filling a simply connected aperture with an anisotropic medium, we decouple the cutoff frequency and the group velocity of modes inside apertures. In the limit of extreme anisotropy, all…
We use a phase-field model for the growth of dendrites in dilute binary alloys under coupled thermosolutal control to explore the dependence of the dendrite tip velocity and radius of curvature upon undercooling, Lewis number (ratio of thermal to solutal diffusivity), alloy concentration, and equilibrium partition coe…
The present work investigates the effect of the anionic codoping on the magnetic properties of the dilute magnetic semiconducting materials doped with transition-metal (TM) ions, namely, that of Zn(Mn,$X$)O, $X=\text{C}$, N, P, and S. The present findings are in complete analogy with the corresponding results for the…
A novel type of elastomers with silver nanoparticles (AgNP) as cross-linkers has been obtained by a quantitative one-phase bottom-up procedure based on α,ω-dimercapto-poly( cis -1,4-isoprene) (PIP). This telechelic polymer with high cis-content of >80% and near-quantitative functionalization degree has been synthesize…
Using the first-principles calculation, we investigate the adsorption of CO and NO on (8, 0) silicon nanotubes (SiNTs). The detailed analysis of the structural and electronical properties of various optimized configurations is performed. The results show that CO molecule can be chemisorbed on SiNT with the C atom bond…
This work reports a new method to improve our recent demonstration of zinc oxide (ZnO) nanoparticles (NPs) selectively killing certain human cancer cells, achieved by incorporating Fe ions into the NPs. Thoroughly characterized cationic ZnO NPs (∼6 nm) doped with Fe ions (Zn(1-x )Fe (x) O, x = 0-0.15) were used in thi…
In this paper, a fishnet-based metamaterial for the microwave X-band frequencies is introduced and investigated both numerically and experimentally. The main innovation introduced here is that the structure is composed of dielectric and metallic parts in such a way that there is no connection between the metallic part…
We investigated the nonlinear and saturable absorption characteristics of Ga 0.90 In 0.10 Se and Ga 0.85 In 0.15 Se semiconductor crystals and their very thin amorphous films by open aperture (OA) Z -scan and pump–probe techniques. The linear absorption spectra indicated a blue shift in energy with increasing film thi…
Eu(2+)-activated SrMg(2)Al(16)O(27) novel phosphor was synthesized by a combustion method (550°C furnace). The prepared phosphor was first characterized by X-ray diffraction (XRD) for confirmation of phase purity. SEM analysis showed the morphology of the phosphor. The photoluminescence characteristics showed broad-ba…
A review of the literature reveals potential advantages that papermakers can achieve by placing minerals in the lumens or cell walls of fibers before the pulp is formed into paper. Loading of filler into the fiber lumen by mechanical deposition or within the cell wall by in-situ precipitation has been reported to gene…