Materials Literature
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We study the evolution of lattice defects in single-crystal ZnO bombarded with 60-keV ${}^{28}\mathrm{Si}$ and 300-keV ${}^{197}\mathrm{Au}$ ions at 77 and 300 K. To characterize ion-beam-produced structural defects, we use a combination of Rutherford backscattering/channeling (RBS/C) spectrometry, cross-sectional tra…
Carbon nanotubes and nanofibers are graphitic filaments/whiskers with diameters ranging from 0.4 to 500 nm and lengths in the range of several micrometers to millimeters. Carbon nanofibers and nanotubes are grown by the diffusion of carbon (via catalytic decomposition of carbon containing gases or vaporized carbon fro…
Static lattice simulation techniques are applied to modeling the structures of the lanthanide manganates (LnMnO 3 ). New interatomic potentials are developed based on the Born model of the ionic solid supplemented by the angular overlap model to describe the nonspherical components of the Mn 3+ −O 2 - interactions. Th…
The isotropic−cholesteric phase boundary concentrations and interfacial tension were measured for tetrahydrofuran (THF) solutions of fractionated cellulose tris(phenyl carbamate) (CTC) samples. The phase boundary concentrations are compared with the scaled particle theory for the hard wormlike spherocylinder model as…
Aminoacylase 1 is a zinc-binding metalloprotease catalyzing the hydrolysis of N(alpha)-acylated l-amino acids; it presents altered expression levels in different renal and small cell lung carcinomas. A description of its redox and oligomerization state was achieved by combined biochemical and mass spectrometric proced…
A novel synthetic route to symmetric and nonsymmetric dithienylethene derivatives with a 2,5-dihydrothiophene bridging unit was described. A class of new functional photochromic compounds was prepared and showed photochromic properties similar to those of known diarylethenes. [reaction: see text]
The adsorption behavior of hydrophilic silica nanoparticles (fumed Aerosil 380) at the polydimethylsiloxane (PDMS) droplet−water interface has been investigated through particle adsorption isotherms, with complementary studies of the adsorbed layer structure by freeze−fracture SEM. The influence of solution conditions…
Deconstructible polymeric films have potential applications in the areas of drug delivery, patterning, and membrane science. Here, we report on the preparation of heterogeneous multilayer films comprising alternate stacks of hydrogen-bonded (poly(4-vinylpyridine) (P4VP) and poly(acrylic acid, sodium salt) (PAA)) and e…
For insight into the thermodynamics and phase behavior in concentrated protein solutions, we study the liquid−liquid phase separation with lysozyme. We determine independently the binodal and spinodal lines, and the second virial coefficient of the protein at 275 < T < 295 K. From these data, we determine the protein…
The modulus of single wall carbon nanotube (SWNT) films and fibers, calculated using continuum mechanics and the SWNT rope elastic constants, is consistent with the experimentally measured moduli of these products. The modulus of large diameter ropes drops precipitously with orientation, while the smaller diameter rop…
The pH dependencies of the UV-vis and fluorescent spectra of new water-soluble dendritic porphyrins and tetrabenzoporphyrins were studied. Because of extended pi-conjugation and nonplanar distortion, the absorption and the emission bands of tetraaryltetrabenzoporphyrins (Ar(4)TBP) are red-shifted and do not overlap wi…
Poly(L-lactide) [i.e., poly(L-lactic acid) (PLLA)] was hydrolyzed in the melt in high-temperature and high-pressure water at the temperature range of 180-350 degrees C for a period of 30 min, and formation, racemization, and decomposition of lactic acids and molecular weight change of PLLA were investigated. The highe…
Colloid-imprinted carbons (CIC) with average pore sizes of 12, 22, 45, and 85 nm have been used as templates for the nanocasting of ZSM-5 zeolite with spherical domain sizes comparable to the pore sizes of the CIC template. The size and shape fidelity of the CIC-nanocasted zeolite allows one to control both the extern…
Free radicals generated by decomposition of benzoyl peroxide in the presence of alkyl iodides have been used to derivatize small-diameter single-wall carbon nanotubes (HiPco tubes). The degree of functionalization, estimated by thermal gravimetric analysis, is as high as 1 in approximately 5 carbons in the nanotube fr…
This work presents the first systematic study of the surface-enhanced Raman-scattering (SERS) properties of nanosphere lithography (NSL) derived Ag nanoparticles. Furthermore, it demonstrates the necessity of correlating nanoparticle structure and localized surface plasmon resonance (LSPR) spectroscopic data in order…
Abstract Nonlinear optical (NLO) rigid main‐chain polyesters containing azobenzene mesogens with high thermal and temporal stabilities were synthesized from derivatives of hydroxyphenylazobenzoic acid. The NLO properties of the homopolymer, poly[4‐(4‐hydroxy‐3‐methyl phenyl)azo]benzoic acid, and copolymers of 4‐[(4‐hy…
We report on the influence of semicrystalline morphology on the physical aging characteristics of poly(phenylene sulfide) or PPS. Specifically, the semicrystalline morphology of PPS was described in terms of a three-phase system comprising a crystalline phase, a mobile-amorphous phase, and a rigid-amorphous phase. The…
We study the self-assembly in thin films of a lamella-forming polystyrene- block -poly(2-vinylpyridine)- block -poly( tert -butyl methacrylate) triblock terpolymer thin film on a polyimide substrate and compare it with the self-assembly of the same system on a native oxide silicon (SiO x ) substrate. In addition to sc…
Nuclear ribosomal small subunit and chloroplast rbc L sequence data for heterokont algae and potential outgroup taxa were analyzed separately and together using maximum parsimony. A series of taxon sampling and character weighting experiments was performed. Traditional classes (e.g. diatoms, Phaeophyceae, etc.) were m…
We study a version of the one-dimensional spin-orbital model with spins $S=1$ relevant to cubic vanadates. At small Hund's coupling ${J}_{H}$ we discover dimerization in a pure electronic system solely due to a dynamical spin-orbital coupling. Above a critical value ${J}_{H},$ a uniform ferromagnetic state is stabiliz…