Materials Literature
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A novel complex nanostructure, produced by the directed assembly of a block copolymer thin film on chemically patterned surfaces, is presented. The new nanostructure, which consists of cylinders oriented alternately parallel and perpendicular to the surface (see figure, a result of self-consistent field calculations),…
A mixture of Zr, B 4 C, and Si powders was adopted to synthesize a ZrB 2 –SiC composite using the spark plasma sintering–reactive synthesis (SPS–RS) method. SPS treatments were carried out in the temperature range of 1350°–1500°C under a varying pressure of 20–65 MPa with a 3‐min holding time. A dense (∼98.5%) ZrB 2 –…
Chronopotentiometry and chronoammperometry methods are used to study the photocharging and electrochemical discharging of Ag nanocrystals on indium tin oxide (ITO) substrates. The photocharging is initiated by Ag plasmon electronic excitation, which causes the oxidation of surface-bound citrate ions. In aqueous citrat…
Abstract BACKGROUND: Several storage techniques have been developed to extend the post‐harvest shelf life of horticultural products. One method involves the use of edible or biodegradable coatings. Such coatings are made of biological materials that are used to coat fresh products, providing a semi‐permeable barrier t…
We examine the dark and the illuminated current–voltage ( J – V ) characteristics of poly(3-octylthiophene) (P3OT)/single-wall carbon nanotube (SWNT) composite photovoltaic cells as a function of SWNT concentration. Using an exponential band tail model, the influence of SWNT concentration on the J – V characteristics…
Methanol was used as a probe molecule to examine the reforming activity of oxygenates on NiPt(111) and CoPt(111) bimetallic surfaces, utilizing density functional theory (DFT) modeling, temperature-programmed desorption, and high-resolution electron energy loss spectroscopy (HREELS). DFT results revealed a correlation…
We report electrically refreshable carbon-nanotube (CNT)-based gas sensors with a field effect transistor (FET) structure. The sensors can be refreshed by applying a negative gate voltage pulse in NO 2 and a positive gate voltage pulse in NH 3 . Furthermore, the temporal response of the conductance to the gate voltage…
High Resolution Image Download MS PowerPoint Slide We report the selective growth of bulk single-walled carbon nanotube (SWCNT) samples enriched with three different dominant chiralities including (6,5), (7,5), and (7,6) through adjusting the pressure of carbon monoxide on Co−Mo catalysts from 2 to 18 bar. Semiconduct…
Abstract This study proposes two types of shape memory alloy (SMA)‐based devices, the tension‐SMA device (TSD) and the scissor‐SMA device (SSD), for the increase of stiffness. Both devices employ superelastic NiTi wires with a diameter of 1.2 mm. Performance tests to study pseudoelastic behavior of NiTi wires find tha…
The formation of a vertically aligned carbon nanotube (VA-CNT) array in a floating catalyst process was described as a synchronous growth that resulted from the interaction of fast growth and slow growth CNTs. The array growth was characterized by the observations that straight and curved CNTs were formed during growt…
Shaped, mesoporous carbon nanoparticles (MSP-3) were prepared in high yield by a simple direct synthesis using a block copolymer surfactant as the mesopore-directing agent and a colloidal crystal to mold the external shape of the particles. The product consisted of monodisperse nanocubes and uniform nanospheres or tet…
The rates of multicarrier recombination are measured in colloidal quantum dots with and without hole surface trapping and with hole extraction in type II core/shell systems. We report that hole trapping or the physical separation of electronic and hole wavefunctions into different semiconductor domains of a type II sy…
Abstract The dimensional changes associated with moisture absorption were examined for various polyamides (PAs). Plaques of varying thickness were compression‐molded or injection‐molded and then immersed in water. Periodically, the plaques were removed from water and their mass and dimensions were measured. This was c…
Injection of photoelectrons from colloidal CdSe quantum dots (QDs) capped by thioglycolic acid into compact ultrathin TiO 2 layers was investigated by direct detection of modulated charge separation with surface photovoltage spectroscopy. A size-dependent peak related to light absorption in the CdSe QDs and charge tra…
We fabricated highly aligned porous silicon carbide (SiC) ceramics decorated with SiC nanowires by the unidirectional freeze casting of SiC/camphene slurries with various polycarbosilane (PCS) contents, ranging from 0 to 20 wt% in relation to the SiC powders, in which the PCS preceramic was used as a binder and source…
Novel bis(arylamine-substituted) oligo(ladder-type pentaphenylene)s 1-3, with bridge lengths estimated to be 2.2, 4.2, and 6.3 nm, respectively, have been developed, and the model compound 4 with a mono-arylamine substituent was also synthesized. Their absorption spectra in different solvents are almost identical, whi…
Aluminium nitride (AlN) one-dimensional (1D) nanostructures, including crystalline nanowires, faceted nanotubes and conventional single-walled nanotubes, were investigated by means of density functional theory (DFT) using the generalized gradient approximation (GGA). While the larger diameter crystalline nanowires are…
BACKGROUND: Superparamagnetic nanoparticles are currently used as contrast agents for magnetic resonance imaging. These particles can also be used as drug carriers for local chemotherapy, called magnetic drug targeting. Using an external magnetic field, colloidal nanoparticles can be directed to a specific body compar…
Colloidal homobranched ZnSe nanowires (NWs) and heterobranched CdSe-ZnSe NWs are successfully synthesized by combining a sequential seeding strategy with the solution-liquid-solid (SLS) growth process. We have developed an efficient approach to deposit secondary bismuth nanoparticles onto the NW backbone to induce the…
We propose a model describing liquid-solid phase coexistence in mixed lipid membranes by including explicitly the occurrence of a rippled phase. For a single component membrane, we employ a previous model in which the membrane thickness is used as an order parameter. As function of temperature, this model properly acc…