Materials Literature
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Properly functionalized amphiphilic cyclodextrins (CDs) can act as capping agents for gold colloids in solution (Mazzaglia, A.; et al. J. Phys. Chem. C 2008, 112, 6764). In the present work, we report a study on a hybrid gold nanoparticles/amphiphilic CD supramolecular system assembled onto a surface by both field emi…
The hierarchical structure silica surface of inlaying silica nanoparticles along a regular pillar-like pattern is fabricated by embossing silica sol-gel precursor mixed with silica nanoparticles on glass substrates with an elastomeric mold. The substrate is further modified by a self-assembled fluorosilanated monolaye…
This study focuses on an aqueous one-pot method for synthesis of CdSe/ZnS core/shell QDs using microwave radiation. The novelty of the study is the use of Zn(NH 3 ) 4 2+ as the zinc source. Using an initial solution with the composition Cd 1 Se 1 Zn 6 MPA 20, the QDs obtained upon heating at 160 °C for 60 min were not…
Ternary germanide ${\text{SrPd}}_{2}{\text{Ge}}_{2}$ has been prepared by arc melting. The crystal structure of this germanide was determined by single-crystal x-ray diffraction. This is isostructural with the recently discovered superconductors ${(\text{Ba},\text{Sr})}_{1\ensuremath{-}x}{(\text{K},\text{Cs})}_{x}{\te…
We present a generalized van der Waals theory for a lyotropic cholesteric system of chiral spherocylinders based on the classical Onsager theory for hard anisometric bodies. The rods consist of a hard spherocylindrical backbone surrounded with a square-well potential to account for attractive (or soft repulsive) inter…
A syndiotactic polypropylene (sPP) fibrous membrane was successfully prepared from a multicomponent solvent system at room temperature. As demonstrated by SEM, the morphology of sPP was strongly dependent upon the environment, especially the ambient temperature during electrospinning. The crystal structure of electros…
New tailormade BODIPY dyes have been synthesized by a simple protocol to reach wavelength finely tunable laser action from 540 to 625 nm while maintaining highly efficient and photostable laser emission. The new dyes are analogues of the commercial dye PM597 with the eight position free (PTH8) or substituted by the gr…
The fluorescence photoswitching of photochrome-fluorophore ( PF ) mixtures based on 1,2-bis(5′-ethoxy-2′-(2”-pyridyl) thiazolyl) perfluorocyclopentene ( P ) and pyrromethene 597 ( F ) were studied. Polymethylmethracrylate (PMMA) films were fabricated with respective concentrations of 1.0 × 10 −2 mol L −1 for P, and 9.…
Intercrossed ZnS nanostructures doped with Ga (ZnS:Ga nanowalls) have been synthesized in high yield from mixed powders in a vacuum furnace. ZnS:Ga nanowalls were grown vertically on the substrate with the size in the range of several micrometers and the thickness down to ∼15 nm and have very rough edges. Due to the h…
An inexpensive, fast, selective, and sensitive technique for surface area measurement of metallic nanoporous materials (MNPM) is developed, systematically tested, and validated. The approach employed is based on underpotential deposition (UPD) of metals on foreign substrates. In this work, Pb UPD on Au is chosen to il…
We develop an effective medium theory to study the electrical transport properties of disordered graphene. The theory includes nonlinear screening and exchange-correlation effects allowing us to consider experimentally relevant strengths of the Coulomb interaction. Assuming random Coulomb impurities, we calculate the…
The energies and lifetimes of magnons in several Mn-based Heusler alloys are studied using linear response density functional theory. The number of the spin wave branches in Co(2)MnSi corresponds to the number of its magnetic sublattices in contrast with the NiMnSb case in which the induced Ni sublattice cannot suppor…
Dry oxidizing methods have been widely used to modify surface properties of polymer and ceramic substrates. Compared to other dry oxidizing methods, ultraviolet light/ozone (UV/O 3 ) treatment has hitherto attracted less attention, mainly due to relatively weak oxidizing power. With optimized processing conditions, ho…
The pH-induced self-assembly of three synthetic tripeptides in water medium is used to immobilize luminescent CdS nanoparticles. These peptides form a nanofibrillar network structure upon gelation in aqueous medium at basic pH values (pH 11.0-13.0), and the fabrication of CdS nanoparticles on the gel nanofiber confers…
A method is described for producing highly luminescent composite NIR-to-visible upconversion thin films, made from β-NaYF 4:3%Er,17%Yb nanocrystals in a polymethyl methacrylate (PMMA) matrix, which require no postdeposition heat treatment. Nanocrystals are synthesized via a single-phase, high-boiling-point solvent met…
ABSTRACT Thermal decomposition of corn starches with different amylose to amylopectin ratios (0:100 waxy, 23:77 maize, 50:50 Gelose 50, 80:20 Gelose 80) were studied by thermogravimetric analysis (TGA) in an open system and differential scanning calorimetry (DSC) in a sealed system using stainless steel high‐pressure…
We report molecular dynamics simulations for a new model of tetrahedral network glass-former, based on short-range spherical potentials. Despite the simplicity of the forcefield employed, our model reproduces some essential physical properties of silica, an archetypal network-forming material. Structural and dynamical…
Investigation of the solvent and alkoxide precursor effect on the nonhydrolytic sol-gel synthesis of oxide nanoparticles by means of an ether elimination (Bradley) reaction indicates that the best crystallinity of the resulting oxide particles is achieved on application of aprotic ketone solvents, such as acetophenone…
A first-principles investigation on the electronic properties of the silicon carbon nanoribbons (SiC NRs) having zigzag-shaped edges passivated by hydrogen with widths up to 1.7 nm is presented. It is found that, for the zigzag SiC NRs wider than 0.6 nm, the ground state is a ferrimagnetic state that has two different…
Highly crystalline corundum-structured α-(Ga 1- x Fe x ) 2 O 3 alloy thin films were fabricated on c -plane sapphire substrates by using a mist chemical vapor deposition method. The full-widths at half maximum of X-ray diffraction rocking curves were smaller than 100 arcsec for the entire range of x from 0 to 1. Optic…