Materials Literature
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A weakly Ti-doped copper nitride (Cu 3 N) film was prepared by cylindrical magnetron sputtering. The XPS results indicate that Ti atoms do not substitute for the Cu atoms but probably locate at the grain boundaries. The columnar grains size is about half of that of the undoped Cu 3 N film and the surface is smoother.…
Lead-free (K x Na 1− x ) 1− y Li y Nb 0.80 Ta 0.20 O 3 ceramics have been prepared using the conventional solid-state reaction technique in ambience. A systematic study was carried out to examine the existence and influences of two speculated morphotropic phase boundaries (MPBs). The result shows that the widely-accep…
The optical properties of ultrathin Au films on silicon have been studied in the infrared over a wide frequency range from 200 to 10,000 cm(-1). Thick films show a Drude behavior; i.e., with increasing frequency the transmission increases; for films below the percolation threshold at about 5 nm a negative slope for th…
Nanowires of SiC were synthesized by carbothermally reducing PVP/TEOS composite fibres obtained by electrospinning. High-resolution transmission electron microscopy (HRTEM) and selected-area electron diffraction (SAED) indicated that the SiC nanowires are single crystalline in nature. Both Fourier-transformed infrared…
A magnetism-assisted chemical vapor deposition method was developed to synthesize branched or iron-encapsulated carbon nanotubes. In the process, the external magnetic field can promote the coalescence or division of the catalyst particles, causing the formation of branched or encapsulated nanostructures. This finding…
Crosses or chains? The two free pyridyl groups of a dimeric, triethanolamine-triisonicotinate-bridged palladium complex allow the formation of a unique microcross morphology or chain array of microcrystals (see picture), depending on the reaction conditions. These morphologies arise from interactions between microcrys…
We have studied the propagation properties of transverse acoustic wave in molecular magnets in the presence of a strong ac magnetic field. Due to quantum interference introduced by the strong electromagnetic field, the acoustic wave can propagate without absorption under appropriate conditions, which is a direct resul…
We consider the differential conductance of a normal-superconductor junction in clean bilayer graphene in the framework of the Dirac--Bogoliubov--de Gennes equation. A remarkable suppression of the differential conductance at voltages just below the superconducting gap is found. This can be understood in terms of the…
CdSe/ZnS quantum dots (QDs) were incorporated into biocompatible polyisoprene (PI) particles by microencapsulation through emulsification/solvent evaporation, a technique that is facile, robust, and inexpensive. Emulsification/solvent evaporation results in QDs encapsulated into the particle core without requiring che…
We report hydrogen plasma treatment results on converting the metallic single-walled carbon nanotubes to semiconducting single-walled carbon nanotubes. We found that the as-grown single-walled carbon nanotubes (SWNTs) can be sorted as three groups which behave as metallic, as-metallic, and semiconducting SWNTs. These…
Scanning tunneling microscopy (STM) was used to produce atomic resolution images of the Nb-doped ${\mathrm{SrTiO}}_{3}(001)\text{\ensuremath{-}}(\sqrt{5}\ifmmode\times\else\texttimes\fi{}\sqrt{5})\text{\ensuremath{-}}R26.6\ifmmode^\circ\else\textdegree\fi{}$ reconstruction and its precursor surfaces. Low-energy electr…
Lead-free ceramics (K 0.5 Na 0.5 ) 1− x Li x (Nb 1− y Sb y )O 3 have been prepared by an ordinary sintering technique. Li + and Sb 5+ diffuse into the K 0.5 Na 0.5 NbO 3 lattices to form a solid solution with the perovskite structure. The substitution of Li + increases the Curie temperature T c and shifts the ferroele…
The dielectric investigation of BaBi 2 Nb 2 O 9 (BBN) ceramics was performed in a broad frequency and temperature range. It was observed, that this ceramics possesses not typical ferroelectric relaxor behaviour, which is close to dipolar glass. A very diffuse phase transition is observed in the whole measured temperat…
Controlled light emission is generated from thin films of fluorophores that are encapsulated in diblock copolymer micelles. The mutual distance between the two fluorophores is regulated by utilization of the nanometer-sized micellar structure, which enables or restricts energy transfer between the fluorophores. This e…
Fragments of C24H12, adapted from a variety of armchair [(n,n), (n = 5, 7, and 8)] and zigzag [(m,0) (m = 8, 10, and 12)] single-walled carbon nanotube (SWCNT), are used to model corresponding SWCNTs with different diameters and electronic structures. The parallel binding mainly through pi...pi stacking interaction, a…
Robust polymer brushes are grown from a planar mica surface (see figure) using atom-transfer radical polymerization. The brushes are characterized by X-ray photoelectron spectroscopy, X-ray reflectometry, atomic force microscopy, optical interferometry, and surface forces.
Polyelectrolyte multilayer sensor capsules, 5 microm in diameter, which contained fluorescein-labeled poly(acrylic acid) (PAAAF) as pH-sensitive reporter molecules, were fabricated and employed to explore their endocytotic uptake into HEK 293T cells by flow cytometry. The percentage of capsules residing in the endolys…
Building upon the finding that zwitterionic liposomes can be stabilized against fusion up to very high surface coverage by the adsorption to submonolayer (≈25%) surface coverage of nanoparticles (Zhang, L.; Granick, S. Nano Lett. 2006, 6, 694), here we compare the efficacy of cationic and anionic nanoparticles for the…
New poly( N -substituted dithieno[3,2- b:2‘,3‘- d ]pyrrole)s (PDTPs) with high molecular weights, good yields, and increased solubility were prepared, and their supramolecular behavior was studied. The polymers differ in their polymerization method (using chemical oxidants, Stille-couplings, or a Yamamoto-type polymer…
The present study aims at developing a new photocatalyst for NO reduction and CO oxidation by creating redox adsorption sites and utilizing oxide ion vacancy in titania. For this purpose, Pd ion-substituted TiO 2, Ti 1- x Pd x O 2- δ, was synthesized for the first time by solution combustion method. The photocatalytic…