Materials Literature
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We investigate the van der Waals interaction of D,L-Ala cyclopeptide nanotubes and various ions, ion-water clusters and C(60) fullerenes, using the Lennard-Jones potential and a continuum approach which assumes that the atoms are smeared over the peptide nanotube providing an average atomic density. Our results predic…
The photochromic naphthalene-bridged imidazole dimer containing a naphthyl moiety that tethers two triarylimidazole units shows instantaneous coloration upon exposure to UV light and rapid fading in the dark. In this work, we demonstrate the formation of a stable chiral radical-pair that exhibits no photoracemization…
High quality stoichiometric lead sulfide (PbS) wires were synthesized by a simple chemical vapor deposition (CVD) process using pure PbS powder as the material source. Growth mechanisms were systematically investigated under various growth conditions, with three modes of growth identified: direct vapor-liquid-solid (V…
The molecular mean-field theory for the nematic-isotropic (N-Iso) phase transition in the vicinity of the surface is derived. We have shown that the nematic order parameter in liquid crystal near the surface is generally different from that in the bulk. It is never equal to zero if the anisotropic interaction with the…
BACKGROUND: Tumor vasculature frequently fails to supply sufficient levels of oxygen to tumor tissue resulting in radioresistant hypoxic tumors. To improve therapeutic outcome radiotherapy (RT) may be combined with cytotoxic agents. METHODS: In this study we have investigated the combination of RT with the cytotoxic a…
Here, we studied Rayleigh-Brillouin light scattering in ten different glass-forming liquids (α-picoline, toluene, o-toluidine, ethanol, salol, glycerol, dibutyl phthalate, o-terphenyl, propylene carbonate, and propylene glycol). For each of these liquids it was found that the Landau-Placzek ratio is in a good agreemen…
Abstract Differential scanning calorimetry (DSC), dynamic mechanical thermal analysis (DMTA) and X‐ray diffraction have been used to characterize the structure of a crosslinked polyester (poly(glycerol sebacate), PGS), prepared from a molar ratio of a diacid (sebacic acid) and a triol (glycerol), and their composites…
Surfactant-intercalated layered double-hydroxide solid Mg-Al LDH-dodecyl sulfate (DDS) undergoes rapid and facile delamination to its ultimate constituent, single sheets of nanometer thickness and micrometer size, in a nonpolar solvent such as toluene to form stable dispersions. The delaminated nanosheets are electric…
Classical molecular dynamics simulations have been used to explore the phase diagrams for a family of attractive-repulsive soft-core Gay-Berne models [R. Berardi, C. Zannoni, J. S. Lintuvuori, and M. R. Wilson, J. Chem. Phys. 131, 174107 (2009)] and determine the effect of particle softness, i.e., of a moderately repu…
Magnetite (Fe 3−δ O 4 ) nanoparticles with the size less than 30 nm have been synthesized by using a simple reverse co-precipitation method at room temperature. During the process, ferrous sulfate (FeSO 4 ·7H 2 O) powder was used as an iron precursor, and ammonium hydroxide (NH 4 OH) as a precipitating agent. The expe…
We study theoretically the Kondo effect for a magnetic adatom on graphene using the Anderson model. After obtaining the Green's function of the impurity up to higher-order contributions in the hybridization, we calculate analytically the self-energy in the presence of strong correlations. It is found that the Kondo re…
Raman peaks are barely detectable for molecules present on macroscopically smooth metal substrates. Raman peaks can be observed, however, by allowing Ag or Au nanoparticles to overlie the adsorbate molecules. For instance, no Raman peaks are detected for 4-aminobenzenethiol (4-ABT) on a flat Au substrate. Upon attachi…
Crystalline boron has been prepared via high-pressure, high-temperature pyrolysis of decaborane, B 10 H 14 . We obtained α-tetragonal boron crystals at a pressure of 8–9 GPa and temperatures in the range 1100–1600°C and β-rhombohedral boron intergrowths at 3 GPa and 1200°C.
In the present study, we focus on the interactions between poly(propylene imine) (PPI) dendrimer and 18 of the 20 common amino acids by several NMR techniques, including NMR titrations and NOESY analysis. Surface ionic interactions and interior encapsulations were observed, and the binding behavior of amino acids with…
Dynamic gold nanoparticles: Small gold particles were found to take on a multiply twinned (MTP) structure on weakly interacting carbon supports. Real-time structural behavior of real-world carbon-supported catalytic species is described without resorting to modeling techniques (see figure).
We present a full wave 3D simulation study of optical absorption enhancement in solution processed metal-semiconductor nanocomposite ultrathin films, which consist of colloidal metallic nanoparticles (MNPs) and semiconductor matrices of polymer and colloidal quantum dots (CQD). We present an approach for modeling the…
Strong I···O halogen bonds are identified in a series of cation radical salts of the donor molecule 3,4-diiodo-3′,4′-ethylenedithiotetrathiafulvalene (EDT-TTFI 2, 1 ) with ClO 4 – and various organic sulfonates, such as racemic camphor sulfonate, 1,5- and 2,6-naphtalene bis(sulfonate), and 2,6-anthracene bis(sulfonate…
The toxicological studies on carbon nanotubes (CNTs) have been urgently needed from the emerging diverse applications of CNTs. Physicochemical properties such as shape, diameter, conductance, surface charge and surface chemistry of CNTs gained during manufacturing processes play a key role in the toxicity. In this stu…
First examples of laterally connected bent-core dimesogens and liquid crystalline dimesogens involving bent-core units and rod-like units are reported. Four distinct types of dimesogens have been synthesized and investigated by polarizing microscopy (PM), differential scanning calorimetry (DSC) and X-ray diffraction (…
An advanced model has been developed for predicting the behavior of a fiber as it is formed in the melt blowing process. The model involves the simultaneous solution of the momentum, energy, and continuity equations. Crystallization effects are included. The model equations are solved numerically. As a bottom boundary…