Materials Literature
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We present surface-enhanced Raman scattering (SERS) studies of DNA nucleosides using biologically benign agarose-stabilized gold nanoparticles (AAuNP). We compare the SERS activity of nucleosides with AAuNP to that of commercially obtained citrate-stabilized gold nanoparticles and find the SERS activity to be an order…
Metal impurities in the carbon nanotubes and carbon nanofibers play an important role in understanding their physical and chemical properties. We apply the Ni $K$-edge x-ray absorption fine structure analyses to the local electronic and geometric structures around embedded Ni impurities used as catalysts in a carbon n…
We investigate corners and steps of interfaces in anisotropic systems. Starting from a stable planar front in a general reaction-diffusion-convection system, we show existence of almost planar interior and exterior corners. When the interface propagation is unstable in some directions, we show that small steps in the…
Mn doping in $\mathrm{GaN}$ results in the generation of deep acceptor levels in the band gap of $\mathrm{GaN}$. In the absence of any extrinsic doping, these levels are partially occupied and result in a ferromagnetic state being stabilized. In this work we show that strongly $p$-type conditions generated by the pres…
We have measured the electrical conductivity and the Young modulus of macroscopic oriented ropes containing single-walled carbon nanotubes under ultraviolet (UV) irradiation. We found that UV irradiation increases both the electrical conductivity and the strength of the macroscopic bundle. These phenomena are explaine…
Carbohydrates represent one of the classes of compounds composing \ncell structures and manifesting its viability. Plant tissues contain about 80% \ncarbohydrates, whereas in animals this level does not exceed 2%. As fragments \nin the composition of nucleic acids and glycoproteids, carbohydrates represent \nthe main…
Water‐in‐oil emulsion separations are important to the petrochemical industry for product quality, safety, environmental, and economic reasons. Glass fiber filter media are often used to remove water droplets out of water‐in‐oil emulsions. The experimental results in this work show that 1% by mass of polyamide nanofib…
We report work function and conductivity measurements of the block copolymer poly(3,4-ethylenedioxythiophene)-co-poly(ethylene glycol) (PEDOT-PEG) doped with perchlorate or para-toluenesulfonate anions. The electronic and chemical properties of doped PEDOT-PEG are discussed in the context of the hole injection for org…
The nanographite grains, the diameter of which was around 5nm, were formed on Pt(111) by exposing the Pt(111) substrate to benzene gas at room temperature and annealing it up to 850K. The increase of relative number of edge atoms enabled the observation of edge-derived electronic states. The measurement of ultraviolet…
We analyze recent infrared conductivity data in the normal state of the cuprates. We find that the high-frequency behavior, which has been suggested as evidence for quantum-critical scaling, is generally characteristic of electrons interacting with a broad spectrum of bosons. From explicit calculations, we find a freq…
Nanotubes of poly(4-vinylpyridine) (PVP) and poly(acrylic acid) (PAA) were fabricated by hydrogen bonding based on layer-by-layer (LbL) assembly. The uniform and flexible tubular structures were characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). FTIR and X-ray photoelectron…
Silica glass implanted with Zn ions of 60keV to 1.0×1017ions∕cm2 was annealed in oxygen gas to form ZnO nanoparticles (NPs). In as-implanted state, the implanted Zn atoms form Zn metallic NPs inside of the silica. After annealing at 600°C, ZnO NPs form on the surface, while Zn metallic NPs still remain in the deep reg…
Since long and slender carbon nanotubes (CNTs) are usually self-entangled, we propose a factor, length efficiency, in this study to analyze the thermal conductivity of nanocomposites with CNT loading. Theoretical analysis reveals that an appropriate length distribution of CNTs could improve their length efficiency and…
A method for quantifying the nanomechanics of nanomaterials was developed using a nanoprobe manipulator fitted into a transmission electron microscope. Apparent Young’s moduli of various carbon nanotubes (CNTs) were measured using this method. The apparent Young’s modulus of an arc-grown CNT is as large as approximate…
Abstract HgTe nanocrystals are demonstrated to increase the photon‐harvesting efficiency of hybrid solar cells over a broad spectral region between 350 and 1500 nm. Devices combining two solar cell concepts, a solid‐state nanocrystal‐sensitized solar cell and a nanocrystal/polymer‐blend solar cell, are described. Thes…
Water‐in‐oil (w/o) emulsions were prepared with phosphatidylcholine‐depleted lecithin or polyglycerol polyricinoleate (PGPR) as emulsifying agents. The effect of different laboratory emulsification devices and the effect of sodium chloride on particle size distribution, coalescence stability, and water droplet sedimen…
Abstract Summary: A novel non‐aqueous emulsion system, consisting of cyclohexane as the continuous and acetonitrile as the dispersed phase, is described. Stabilization of the system can be achieved by using polyisoprene‐ block ‐poly(methyl methacrylate) copolymers as emulsifiers. The suitability of this system for per…
Preface. 1 Polarized Light. 1.1 Introduction. 1.2 Concept of Light Polarization. 1.3 Description of The State of Polarization. 1.4 The Stokes Concept. 1.5 The Jones Concept. 1.6 Coherence and Polarized Light. References. 2 Electromagnetic Waves in Anisotropic Materials. 2.1 Introduction. 2.2 Analytical Background. 2.3…
Abstract Two stages in the rational redesign of a peptide‐based, self‐assembling fiber (SAF) are described. The SAF system comprises two peptides designed to form an offset α‐helical coiled‐coil heterodimer. The “sticky‐ends” are complementary and promote longitudinal assembly. Alone, the two peptides are unstructured…
Phosphorus-doped ZnO films were grown by molecular-beam epitaxy with a GaP effusion cell as dopant source. Three growth regions were identified to obtain ZnO films with different conduction types. In the oxygen-extremely-rich region, phosphorus-doped ZnO films show n-type conduction with dominant donor-bound excitons…