Materials Literature
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Recently, the effect of π-bonding electrons conjugating to a gold surface has been predicated by first principles. In this paper, we observe surface plasmon resonance splitting due to the covalence and π-bonding electrons conjugated effect. When surfactantless Au NPs are linked on the glass substrate by sulfur, the SP…
Hydrotalcite-like, α-cobalt hydroxides intercalated with either chloride or anthraquinone-2-sulfonate (AQS2) were crystallized on self-assembled monolayers of 11-mercaptoundecanoic acid on gold as well as poly(acrylic acid) functionalized silicon substrates. These novel functional hybrid films were prepared by the dir…
CdSe/ZnS core/shell nanocrystals (NCs) are integrated into para-sexiphenyl (p-6P) based hybrid light emitting diodes, to obtain green and red emission in addition to blue emission originated from p-6P. For the active region of the devices, ultrathin layers of p-6P and NCs are deposited by hot wall epitaxy and spin cas…
A hexagonal mesoporous silica (HMS) and its postfunctionalized counterparts with propyl (P-HMS) and aminopropyl (AMP-HMS) were prepared and characterized by elemental analysis, N2 adsorption, powder x-ray diffraction, Fourier-transform infrared, and surface charge measurements. Batch experiments were further performed…
Carbon nanotubes loaded with peptides, proteins and drugs can translocate across the cell membrane. This big advantage has attracted increasing attention to design a novel delivery system using nanotubes. Polyoxometalate (POM) is a promising antitumor drug and it shows a very strong interaction with carbon nanotube su…
The dielectric relaxation behavior of the fluorite structured nanocrystalline Ce0.8Gd0.1Pr0.1O2−δ compound was studied in the temperature range of 200–550 °C. Two different types of relaxation processes were observed corresponding to (1) defect pairs such as (PrCe′–VO)• and (GdCe′–VO)• and (2) the trimers such as (PrC…
Plasma etching of densely packed arrays of polystyrene particles leads to arrays of spherical nanostructures with adjustable diameters while keeping the periodicity fixed. A linear dependence between diameter of the particles and etching time was observed for particles down to sizes of sub-50 nm. Subsequent deposition…
We have achieved in situ magnesium doping into nanocrystalline cubic boron nitride thin films during sputter deposition. It was clarified, through x-ray diffraction, Fourier transform infrared spectroscopy and x-ray photoelectron spectroscopy, that less than 1 at% magnesium doping does not significantly affect the gro…
Abstract Poly(ethylene‐ b ‐ ε ‐caprolactone) (PE‐ b ‐PCL) diblock copolymers were synthesized by ring‐opening polymerization (ROP) of ε ‐caprolactone (CL) with α ‐hydroxyl‐ ω ‐methyl polyethylene (PE‐OH) as a macroinitiator and ammonium decamolybdate (NH 4 ) 8 [Mo 10 O 34 ] as a catalyst. Polymerization was conducted…
BACKGROUND: Cisplatin is one of the most active chemotherapeutic agents used in the treatment of advanced squamous cell carcinoma of the head and neck (SCCHN). However, its clinical efficacy is limited by its renal and hematotoxicity profile. In a randomized, multicenter phase III trial, we replaced conventional cispl…
The reverse leakage current in n-type nanodiamond film/p-type silicon wafer heterojunction diodes is examined as a function of the film conductivity. We observe that as the delocalization of carriers in the films becomes stronger, the leakage current becomes larger (from 10−3 to 101 A cm−2). The major leakage source i…
Adsorption geometries and binding affinities of metal nanoparticles onto carbon nanotubes (CNTs) are investigated through density-functional-theory calculations. Clusters of 13 metal atoms are used as models for metal nanoparticles. Palladium, platinum, and titanium particles strongly chemisorb to the CNT surface. Unl…
Sustained laser-induced incandescence (LII) was observed when a continuous wave laser beam was focused on aligned multiwalled carbon nanotubes (CNTs) in vacuum. The sustained incandescence originated from radiative dissipation of heated CNTs due to laser-CNT interactions. Sustainability of the LII up to 2 h was achiev…
X-ray diffraction, transmission electron microscopy and a laser-flash method were used to investigate the order–disorder transition and thermal conductivity of (Yb x Nd1− x )2Zr2O7 (0 ≤ x ≤ 1.00) solid solutions. The structures were found to be pyrochlore-type for 0 ≤ x ≤ 0.25, defect fluorite for 0.45 ≤ x ≤ 1.00 and…
A simple approach to investigate the dependence of emission on the separation distance between metal nanoparticles and semiconductor quantum dots is demonstrated. Without varying the mixed concentrations, a tunable emission is achieved based on the deposition of the composite of Au nanoparticles and CdSe quantum dots…
As the first step to understand the reaction mechanism and diastereoselectivity of sodium borohydride reduction of ketones, ab initio Car-Parrinello molecular dynamics simulation has been performed on a solution of NaBH4 in liquid methanol. According to pointwise thermodynamic integration involving constrained molecul…
Silver nanoparticles deposited on TiO2 nanoporous films exhibited unique photochromic property under the irradiation of visible light. Here we investigated the application of photochromic Ag/TiO2 nanocomposite film in holographic data storage. Stable holographic fringes were formed on the Ag/TiO2 film using two cohere…
Abstract Into neutral : We demonstrate the unique features of a pH click peptide based on an O‐acyl isopeptide method. Under acidic conditions, the click peptide remains in a monomeric form. Upon increase of the pH to 7.4, the click peptide is quickly able to convert into Aβ1–42 through an O‐to‐N intramolecular acyl m…
Photoelectrical characteristics and photoluminescence of n-Bi2O3∕p-GaSe structures have been investigated. They show photosensitivity in the photon energy range of 1.85–3.10eV. During thermal treatment of the heterojunction, Bi and O atoms diffuse into the GaSe layer, forming two impurity levels located at 0.101 and 0…
We have demonstrated the vector holograms using the radially polarized light. The inhomogeneous polarized light well controlled the spatial distribution of the optical anisotropy in the solid state polymeric materials. The theoretical calculation revealed formation mechanism and optical properties of the vector hologr…