Materials Literature
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Silver colloidal nanorings have been synthesized by reducing silver ions with NaBH4 in trisodium citrate buffers. pH increase, by addition of NaOH, was used to speed up reduction reaction. The UV-vis absorption spectra of resulting silver nanorings showed two peaks accounting for transverse and longitudinal surface pl…
Loss of Bi during thin film growth of bismuth-based compounds is a major challenge to obtaining stoichiometric films. Three approaches to BiMnO3 film growth were investigated to understand and to control the loss of Bi. First, a systematic study was carried out using a conventional pulsed laser deposition (PLD) approa…
We investigate the effect of martensitic phase transformations on the dynamic response of commercial AFM silicon cantilevers coated with shape memory alloy (SMA) thin films. We propose a simple thermo-mechanical model to predict the phase transformation. We show experimentally that the SMA thin film dynamic response c…
We demonstrate a simple route for the preparation of 1 inch long continuous gold nanowires having an average diameter of 35 nm by electrospinning a block copolymer solution. Fibers with average diameters of 120–160 nm were collected from electrospinning 12 wt% polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) block…
In this paper, a nanocomposite approach is introduced to provide both electrically conductive and optically transparent micropatterns on any flexible substrate employing photolithography-based microfabrication. The nanocomposite materials combine the highly directional nanoscopic networks and electrical conductivity o…
Contact configuration modification at carbon nanotube (CNT)-metal interface during nanowelding is investigated using molecular dynamics simulation. It is found that the nanowelding could be accomplished at a temperature much lower than the melting point of the metal, during which a side contact structure and core fill…
Abstract A novel amphiphilic sandwich‐type mixed (phthalocyaninato)(porphyrinato)europium double‐decker complex Eu(Pc)[T(OH) 3 PP] [Pc = phthalocyaninate, T(OH) 3 PP = 5,10,15‐tris(4‐hydroxyphenyl)‐20‐(4‐ tert ‐butylphenyl)porphyrinate]( 1 ) was designed, prepared, and characterized by a range of spectroscopic methods…
We investigate the recombination dynamics within screened $c$-axis $\text{ZnO}/{\text{Zn}}_{0.7}{\text{Mg}}_{0.3}\text{O}$ quantum wells using time-resolved photoluminescence and femtosecond pump-probe spectroscopy. The relaxation of excited carriers restores the strength of the internal electric field, which we follo…
The crystal structure of the ternary complex of NAD--dependent formate dehydrogenase from the methylotrophic bacterium Moraxella sp. С -1 with the cofactor (NAD-) and the inhibitor (azide ion) was established at 1.1 A resolution. The complex mimics the structure of the transition state of the enzymatic reaction. The s…
Phase separation (PS) in hole-doped cobaltites (La1−xSrxCoxO3) is drawing renewed interest recently. In particular, the magnetic behavior of La0.85Sr0.15CoO3 has been subjected to a controversial debate for the past several years; while some groups show evidence for magnetic PS, others show spin glass (SG) behavior. H…
A novel method for compartmentalized multistable liquid crystal alignment is presented (see figure). The compartmentalization allows planar-aligned liquid crystal domains to be switched independently under vertical electric fields. This work opens new routes for the design and fabrication of multistable liquid crystal…
In this paper, the interface between two transformation media or between a transformation medium and vacuum is studied. Strictly from the transformation optics point of view, the consequences of the boundary conditions at such interfaces are addressed in two different ways. First, we analyze a restricted class of refl…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTPolymer Brushes Make Nanopore Filter Membranes Size Selective to Dissolved PolymersHyun-Su Lee and Lynn S. Penn*View Author Information Department of Chemistry, Drexel University, Philadelphia, Pennsylvania 19104*Corresponding author. E-mail: [email protected]Cite this: Macromo…
We report on multilayer layer-by-layer (LbL) films of the conjugated polymer sodium poly[2-(3-thienyl)ethyloxy-4-butylsulfonate] (PTH) assembled with polycations: poly(diallyldimethylammonium chloride) (PDDA), 20% quaternized poly(N-ethyl-4-vinylpyridinium bromide) (Q20), poly(ethylene imine) (PEI), and poly(allylamin…
A simple approach for the protection of hydrogen storage materials is based on interfacial polymer precipitation induced by solvent evaporation. Sodium borohydride is successfully protected with a polystyrene shell by co-precipitation. This shell provides a hydrophobic barrier for water diffusion into the container in…
Rayleigh scattering and photoluminescence techniques are used to show the evidence of formation of ZnO nanoparticles in gaseous phase due to condensation of laser ablated ZnO plasma species in air. The intensity of Rayleigh scattered signal increases with the increase in time delays between the probe and the ablating…
Luminescence behaviors of Ce 3+ ions in GeS 2 –Ga 2 S 3 –CsCl chalcohalide glasses are reported for the first time. The dependence of Ce 3+ concentration and host composition on absorption and photoluminescence spectra are investigated. Results show that these glasses exhibit broadband emission from 470 to 600 nm unde…
A method based on the study of the statistical characteristics of SERS signals is proposed to identify regimes in which most of the spectra are primarily single-molecule in nature. Once this regime is identified, the signals can be taken (with some statistical confidence) to represent single-molecule spectra and can b…
The intragranular‐porous ferroelectric ceramic was fabricated for the first time with carbon nanotubes as pore formers and the effects of intragranular pores on the ferroelectric and dielectric properties were investigated. It was found that compared with dense ceramic the introduction of a small amount of intragranul…
The effects of polypropylene on the processing of low‐oxygen silicon carbide (SiC) fibers by the polycarbosilane (PCS) route have been studied. Polypropylene acts as a high‐temperature solvent for PCS, reducing the spinning temperature. A small amount of polypropylene (≤5 wt%) significantly improves the spinning abili…