Materials Literature
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MF(2) (M = Ca,Sr,Ba) nanocrystals (NCs) were synthesized via a solvothermal process in the presence of oleic acid and characterized by x-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared (FT-IR) spectra, UV/vis absorption spectra, photoluminescence (PL) excitation and emission s…
Polyelectrolyte brushes were built on mica by anchoring polystyrene-poly(acrylic acid) (PS-b-PAA) diblock copolymers at a controlled surface density in a polystyrene monolayer covalently attached to OH-activated mica surfaces. Compared to physisorbed polymer brushes, these irreversibly attached charged brushes allow t…
We discuss electric transport and orbital magnetism of multilayer graphenes in a weak-magnetic field using the matrix decomposition technique. At zero temperature, the minimum conductivity is given by that of the monolayer system multiplied by the layer number $N$, independent of the interlayer hopping $t$. When the i…
Nanoboxes and nanocages consisting of three noble metals–Pd, Au, and Ag–are synthesized through the use of sequential galvanic replacement reactions. In addition to their tunable plasmonic properties, these nanostructures catalyze hydrogenation reactions, such as the decolorization of methyl red. Both the plasmonic an…
Abstract Organic electronics research has focused primarily on flexible, inexpensive versions of traditional semiconductor technologies. Although mixed ionic/electronic conduction in conjugated organic materials introduces exciting functionality, the understanding of the fundamental processes that take place is still…
The two main applications of silica-based materials in medicine and biotechnology, i.e. for bone-repairing devices and for drug delivery systems, are presented and discussed. The influence of the structure and chemical composition in the final characteristics and properties of every silica-based material is also shown…
Abstract Synthetic Ag‐bacterial cellulose nanocomposites are reported here and their performance as surface enhanced Raman scattering (SERS) substrates was investigated using thiosalicylic acid and 2,2′‐dithiodipyridine as analytes. These nanocomposite materials act as natural sponges when immersed in aqueous or ethan…
First-principles calculations for the electronic and geometric structures of three different types of armchair silicon carbide nanotubes from (3, 3) to (11, 11) have been performed using hybrid density functional theory and the finite cluster approximation. Full geometry and spin optimizations have been performed with…
Dendritic gold (Au) nanoparticles have been successfully synthesized by the one-step hydrothermal reduction of HAuCl4.4H2O using ammonium formate (AF) as a reducing agent in the presence of PVP. Effects of different reactant concentrations on the morphologies of obtained products have been systematically investigated.…
Erbium-doped yttrium oxide nanotubes (Er 3+:Y 2 O 3 NTs) with 0−100% doping levels were synthesized by a hydrothermal procedure followed by a dehydration process from Er 3+:Y(OH) 3 NTs. The as-synthesized Er 3+:Y 2 O 3 nanotubes ranged from 100 to 400 nm in outer diameter and 2 to 5 μm in length with a hexagonal cross…
This study provided a facile and green method to prepare stable colloid silver nanoparticles in aqueous solution by utilizing the amine-terminated hyperbranched poly(amidoamine) (HPAMAM-NH 2 ) as both stabilizer and reductant. The formation of silver nanoparticles was verified by FTIR, UV−vis, TEM, EDS, and XRD measur…
Highly ordered arrays of mesoporous silica nanorods with a tunable aspect ratio can be fabricated using PEOm-b-PMA(Az)n block copolymer thin films as templates. Together, penetration of the films by the silica precursor and the film thickness control the SiO2 nanorod growth, and heights of almost 200 nm can be achieve…
A general route to fabricate highly ordered arrays of nanoscopic silicon oxide dots and stripes (see figure) from block copolymer thin films is described. Poly(styrene-b-4-vinylpyridine) thin films with cylindrical microdomains oriented normal and parallel to the surface were used as templates for the fabrication of n…
A series of enolic Schiff base aluminum(III) complexes LAlR (where L=NNOO-tetradentate enolic Schiff base ligand) containing ligands that differ in their steric and electronic properties were synthesized. Their single crystals showed that these complexes are five-coordinated around the aluminum center. Their coordinat…
Abstract A facile emulsifier‐free emulsion polymerization approach was developed to fabricate highly monodisperse polystyrene (PS) spheres using potassium persulfate as the initiator and polyvinylpyrrolidone (PVP) as a stabilizer, respectively. It was found that the size of monodisperse PS spheres tends to decrease wi…
In recent years intercalated and pillared graphitic systems have come under increasing scrutiny because of their potential for modern energy technologies. While traditional \emph{ab initio} methods such as the LDA give accurate geometries for graphite they are poorer at predicting physicial properties such as cohesive…
A single-step electroless transmetallation-based approach to create nanoscale porosity in thin films and bulk surfaces has been described and its application in catalysis has been demonstrated. The vast commercial implications of galvanic replacement reactions to create large-scale functional nanomaterials can not be…
The magnetic phase transition is experimentally known to give rise to an anomalous temperature-dependence of the electron resistivity in ferromagnetic crystals. Phenomenological theories based on the interaction between itinerant electron spins and lattice spins have been suggested to explain these observations. In th…
Mathematical arguments are presented that give a unique answer to the question in the title. Subsequently, the mathematical analysis is extended using results of detailed model calculations that, in addition, throw further light on the consequences of the analysis. Finally, through a comparison with various recent stu…
The static dielectric response of C60, C180, C240, C540, C720, C960, C1500, and C2160 fullerenes is characterized by an all-electron density-functional method. First, the screened polarizabilities of C60, C180, C240, and C540, are determined by the finite-field method using Gaussian basis set containing 35 basis funct…