Materials Literature
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A photonic crystal biosensor incorporating a nanomolded porous dielectric is fabricated for the first time on a flexible polysulfone substrate. The plastic substrate necessitates several changes to the fabrication procedure, including reduced processing temperatures. The resulting structure shows excellent response un…
Ion-beam assisted glancing-angle deposition is used to fabricate relative humidity sensors. Ion currents of 3,5, and 7 mA were tested. The morphology and capacitance of the sensors are found to be dependent on the ion current density. The capacitance increases with increasing ion current, especially for the 7 mA case…
The alpha-helical coiled-coil is one of the most common oligomerization motifs found in both native and engineered proteins. To better understand the stability and dynamics of the coiled-coil motifs, including those modified by fluorination, several fluorinated and nonfluorinated parallel dimeric coiled-coil protein s…
Polypyrrole microcapsules were synthesized by the chemical deposition of the polymer onto mineral oil droplets adsorbed onto glass or quartz substrates. The droplets act as a kind of a template that directs the polymer growth into the form of three-dimensional containers. The polymer is deposited on both the surface o…
B3LYP/LANL2DZ and B3LYP/6-31G(d)-restricted and -unrestricted calculations are employed to calculate energies and adsorption forms of formaldehyde adsorbed on planar and on tetrahedral Pd4 clusters and on a Pd4 cluster supported on Al10O15. Formaldehyde adsorbs on planar Pd4 in the eta(2)(C,O)-di-sigma adsorption mode…
We consider a numerical method, the so-called an unconditionally gradient stable adaptive mesh refinement scheme, for solving the Cahn-Hilliard equation representing a model of phase separation in a binary mixture. The continuous problem has a decreasing total energy. We show the same property for the corresponding di…
The development of future generation catalysts and fuel cells based on oxide nanostructures is dependent upon our ability to control the size, shape, and surface chemistry of individual particles. It is currently not possible to characterize the surface of substantial numbers of oxide nanocrystals within large scale s…
We report on reversible metal to insulator transitions in metallic single-walled carbon nanotube devices induced by repeated electron irradiation of a nanotube segment. The transition from a low-resistive, metallic state to a high-resistive, insulating state by 3 orders of magnitude was monitored by electron transport…
Three-dimensional nanostructured metallic substrates for enhanced vibrational spectroscopy are fabricated by self-assembly. Nanostructures consisting of one to 20 depositions of 13 nm-diameter Au nanoparticles (NPs) on Au films are prepared and characterized by means of AFM and UV/Vis reflection-absorption spectroscop…
Polysaccharide-filled plastics have attracted immense interest from research scientists as a means to develop a biodisintegrable polymer. The objective of the present study is to develop a biodisintegrable polymer composite using potato starch, which may be a step toward an alternative user friendly polymer composite.…
Abstract In this study, the direct molecular structure implementations for calculating vibrational spectra and scaling factors, and infrared intensities at both the Hartree–Fock (HF) and density functional (B3LYP) levels of theory with 6‐31G(d), 6‐311G(d), 6‐31++G(d,p), and 6‐311++G(d,p) basis sets are presented. Also…
Abstract A novel chlorotitanium calix[4]arene complex was synthesized and tested, without activator, as catalyst for the polymerization of L ‐ and rac ‐lactide under solvent‐free conditions. The catalyst displayed high activity, which depended on the monomer‐to‐catalyst molar ratio, and led to highly isotactic PLLA. D…
A combination of self-assembled block copolymers with templated substrates can be used for precision lithographic applications.
Sulphonato−salen complexes containing Mn(III), Co(III), and Fe(III) metal centers intercalated into Zn/Al layered double-hydroxide (LDH) host have been synthesized and tested as catalysts for the epoxidation of cyclohexene and dicyclopentadiene using pivaldehyde and molecular oxygen at atmospheric pressure and room te…
Hybrid density functional theory method is applied for investigating the diradical character dependence of the second hyperpolarizability (gamma) of square planar nickel complexes involving several types of bidentate ligands [o-C6H4XY, where X = Y = O, NH, S, Se, and PH as well as (X, Y) = (NH, NH2) and (S, NH2)]. It…
The specific C-6 oxidation by TEMPO of chitosan and chitosan derivatives were studied to obtain tailored bioactive biopolymers. The modifications on chitosan presented many difficulties and showed the adverse effect of the amine moieties of chitosan on this reaction. Thus, protections of the amino groups by N-acetylat…
We report a plasmonic diffraction grating device as a new kind of optical polarizer. This simple device consists of periodically distributed gold nanowires on top of a transparent glass substrate and is based on the strong polarization dependence of the particle plasmon resonance of the gold nanowires. A high-efficien…
A rare family of five and six-coordinated high-spin Fe(III) porphyrins incorporating weak axial ligands are synthesized and structurally characterized which demonstrate, for the first time, stepwise metal displacements in a single distorted macrocyclic environment that has generally been seen in many biological system…
Abstract Electrospinning has been used to produce porous, low density, polymer–nanotube composite membranes. The membrane mechanical properties can be enhanced by tuning the nanotube content, aligning the fibers during spinning, and by post production drawing. The mechanical properties are maximized for membranes with…
A comprehensive study of the adiabatic temperature change $\ensuremath{\Delta}{T}_{\text{ad}}$ in the vicinity of a first-order magnetostructural phase transition has been carried out on a ${\text{Ni}}_{2.19}{\text{Mn}}_{0.81}\text{Ga}$ Heusler alloy. It was found that the directly measured $\ensuremath{\Delta}{T}_{\t…