Materials Literature
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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…
Novozym 435-catalyzed ring-opening of a range of omega-methylated lactones demonstrates fascinating differences in rate of reaction and enantioselectivity. A switch from S- to R-selectivity was observed upon going from small (ring sizes <or=7) to large lactones (ring sizes >or=8). This was attributed to the transition…
Tungsten oxide nanorods were prepared from W 2 N film by a simple annealing method. W 2 N film was deposited on a Si(100) substrate by chemical vapour deposition (CVD) at 450 °C, and then heating of the film at 600–700 °C produces a high density of tungsten oxide nanorods. The morphology, structure, composition and ch…
Abstract The synthesis of a thermoresponsive hydrogel of poly(glycidyl methacrylate‐ co ‐ N ‐isopropylacrylamide) (PGMA‐ co ‐PNIPAM) and its application as a nanoreactor of gold nanoparticles are studied. The thermoresponsive copolymer of PGMA‐ co ‐PNIPAM is first synthesized by the copolymerization of glycidyl methac…
The magnetic and magnetostrictive properties of polycrystalline Co 1− x Mn x Fe 2 O 4 (0 ⩽ x ⩽ 0.4) have been studied. Although the Curie temperature decreases continuously with increasing concentration of Mn, the magnetization remains high up to x = 0.3 and unexpectedly low coercivity is observed for this composition…
Poly(ethylene) glycol (PEG) is an excellent material to modify surfaces to resist non-specific protein adsorption. Linear PEG has been extensively studied both theoretically and experimentally and it has been found that resistance of PEG-coated surfaces to protein adsorption depends mainly on the molecular weight of t…