Dendrimers at Work
Highly branched dendrimer molecules are being used increasingly for such biomedical applications as molecular imaging and drug delivery.
Materials Literature
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Design of shallow acceptors inZnO: First-principles band-structure calculations
$p$-type doping is a great challenge for the full utilization of $\mathrm{ZnO}$ as short-wavelength optoelectronic material. Due to a large electronegative characteristic of oxygen, the ionization energy of acceptors in $\mathrm{ZnO}$ is usually too high. By analyzing the defect wave-function character, we propose sev…
Labeled Gold Nanoparticles Immobilized at Smooth Metallic Substrates: Systematic Investigation of Surface Plasmon Resonance and Surface-Enhanced Raman Scattering
This paper experimentally and theoretically investigates the influence of an underlying metallic substrate (i.e., gold and silver) on the surface plasmon resonance (SPR) of labeled gold nanoparticles and the concomitant impact on the surface-enhanced Raman scattering (SERS) signal from the labels. These experiments em…
Rational Synthesis, Self-Assembly, and Optical Properties of PbS−Au Heterogeneous Nanostructures via Preferential Deposition
High-quality, monodisperse PbS-Au(1), PbS-Au(4), and PbS-Au(n) nanostructures have been synthesized via a facile and convenient solution chemistry approach. HRTEM images of these nanostructures showed good selectivity of gold deposition on the semiconductor in several spatially correlated directions. The formation of…
Palladium‐Catalyzed Coupling Reactions for the Functionalization of BODIPY Dyes with Fluorescence Spanning the Visible Spectrum
Abstract The BODIPY fluorophore can easily be functionalized at the 3‐ (and 5‐)position(s) with one or two aryl, ethenylaryl and ethynylaryl moieties by palladium‐catalyzed coupling reactions of the 3,5‐dichloroBODIPY derivative using the Stille, Suzuki, Heck and Sonogashira reactions. The fluorescence excitation and…
Fragility and thermodynamics in nonpolymeric glass-forming liquids
For nonpolymeric supercooled liquids, the empirical correlation m = 56Tg DeltaCp(Tg)/DeltaHm provides a reliable means of correlating dynamic and thermodynamic variables. The dynamics are characterized by the fragility or steepness index m and the glass transition temperature Tg, while thermodynamics enter in terms of…
A Supramolecular Photocatalyst for the Production of Hydrogen and the Selective Hydrogenation of Tolane
Light-driven metallo-organic catalysis: Intramolecular photoelectron transfer in the heterodinuclear complex 1 facilitates the photocatalytic production of hydrogen and the selective hydrogenation of tolane to give cis-stilbene. All three well-coordinated parts of the supramolecular system are essential: the (tbbpy)2R…
Buckling analysis of micro- and nano-rods/tubes based on nonlocal Timoshenko beam theory
This paper is concerned with the elastic buckling analysis of micro- and nano-rods/tubes based on Eringen's nonlocal elasticity theory and the Timoshenko beam theory. In the former theory, the small scale effect is taken into consideration while the effect of transverse shear deformation is accounted for in the latter…
Enhancement of cellulose saccharification kinetics using an ionic liquid pretreatment step
Hydrolysis of cellulose to glucose in aqueous media catalyzed by the cellulase enzyme system suffers from slow reaction rates due in large part to the highly crystalline structure of cellulose and inaccessibility of enzyme adsorption sites. In this study, an attempt was made to disrupt the cellulose structure using th…
Colloidal Particles at Liquid Interfaces
Small solid particles adsorbed at liquid interfaces arise in many industrial products and process, such as anti-foam formulations, crude oil emulsions and flotation. They act in many ways like traditional surfactant molecules, but offer distinct advantages. However, the understanding of how these particles operate in…
Two-Dimensional Nematic Colloidal Crystals Self-Assembled by Topological Defects
The ability to generate regular spatial arrangements of particles is an important technological and fundamental aspect of colloidal science. We showed that colloidal particles confined to a few-micrometer-thick layer of a nematic liquid crystal form two-dimensional crystal structures that are bound by topological defe…
Importance of short-range versus long-range Hartree-Fock exchange for the performance of hybrid density functionals
We consider a general class of hybrid density functionals with decomposition of the exchange component into short-range and long-range parts. The admixture of Hartree-Fock (HF) exchange is controlled by three parameters: short-range mixing, long-range mixing, and range separation. We study how the variation of these p…
Controlling the Electronic Structure of Bilayer Graphene
We describe the synthesis of bilayer graphene thin films deposited on insulating silicon carbide and report the characterization of their electronic band structure using angle-resolved photoemission. By selectively adjusting the carrier concentration in each layer, changes in the Coulomb potential led to control of th…
Characterization and Quantification of Woven Fabric Irregularities using 2-D Anisotropy Measures
North Carolina State University Theses Textile Engineering, Chemistry and Science.
Spatially resolved study of electronic transport through grain boundaries in nanostructured films ofLa0.67Sr0.33MnO3
We present an investigation on spatially resolved studies of electronic transport in nanostructured (NS) films of the colossal magnetoresistive material ${\mathrm{La}}_{0.67}{\mathrm{Sr}}_{0.33}{\mathrm{MnO}}_{3}$. The NS films (thickness $\ensuremath{\approx}500\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$) were grown on f…
Biodegradable Polyesters Based on cis‐1,4‐Butenediol
Abstract Summary: Homopolyesters based on cis ‐1,4‐butenediol (cBeD) and aliphatic dicarboxylic acids (ADAs) were prepared by three different methods. First, cBeD was polycondensed with the dimethyl esters of ADAs in bulk. Regardless of the catalyst, only low‐molar‐mass polyesters were obtained. Second, polycondensati…
Conducting Metallopolymers Based on Azaferrocene
A series of 2,5-thiophene-substituted 1',2',3',4',5'-pentamethylazaferrocene complexes were synthesized and electropolymerized to produce polymers with fully pi-conjugated backbones. The length and hence oxidation potential of the conjugated linker (the thiophene fragments) between the metal centers were varied to und…
Synthesis of isolated silver nanoparticles and their aggregates manipulated by light
The feasibility of light-driven engineering of isolated colloidal silver nanoparticles or, alternatively, of large fractal-type aggregates comprising hundreds to thousands of nanoparticles is investigated. Control over the size and shape of such nanostructures is shown by varying the type of optical irradiation and th…
Layer-by-layer analysis of the linear optical response of clean and hydrogenated Si(100) surfaces
We calculate the reflectance anisotropy and the reflectance-difference spectra for a clean Si(100) surface and two hydrogen- (H-) covered Si(100) surfaces. The clean surface is a $2\ifmmode\times\else\texttimes\fi{}1$ surface reconstruction, characterized by a tilted dimer formed between the two topmost Si atoms. One…
Substrate and Surfactant Effects on the Glass−Liquid Transition of Thin Water Films
Temperature-programmed time-of-flight secondary ion mass spectrometry (TP-TOF-SIMS) and temperature-programmed desorption (TPD) have been used to perform a detailed investigation of the adsorption, desorption, and glass-liquid transition of water on the graphite and Ni(111) surfaces in the temperature range 13-200 K.…