Materials Literature
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By performing an atomistic transport calculation, we examine the temperature dependence of the tunneling current in a graphene nanoribbon band-to-band tunneling transistor. The subthreshold swing is shown to be a nonlinear function of temperature, and in stark contrast to a conventional FET, the swing versus temperatu…
We present an experimental analysis of different equilibrium orientations and light driven transformations of Janus particles in the nematic liquid crystal 5CB. Depending on the preparation technique of homeotropic (DMOAP) and planar (Au) hemispheres we have observed two types of director field configurations: dipolar…
Having it both ways: The reversible photoisomerization of a derivative of spiropyran at the level of a single crystal by using zeolite L is demonstrated. The synthesized spiropyran exhibits rare negative photochromism when dissolved in a 1:1 mixture of H2O and EtOH The spiropyran is functionalized predominantly at the…
Bi 3.15 Nd 0.85 Ti 3 O 12 (BNT) nanofibers with radii in the range of 30–200 nm have been prepared by the electrospinning and sol-gel method, and the structure and morphology of the nanofibers were characterize by x-ray diffraction, scanning electron microscopy, transmission electron microscopy, and Raman spectroscopy…
Capacitance-voltage measurements have been performed on individual metal-carbon nanotube (CNT) Schottky diodes. The capacitance is found to agree in general with electrostatic simulations, taking into account the one-dimensional density of states of the CNT, and depends strongly on the Schottky barrier height and the…
Electrostatic exfoliation of patterned few-layer-graphenes was demonstrated using a method compatible with high throughput roll-to-roll manufacturing. A patterned graphite template was placed on a roller and used to exfoliate patterned graphene on a planar substrate. The exfoliated graphene features were subsequently…
This paper focuses on the characterization of the macroporosity, the porosity among the tows, observed in chemical vapor infiltration composites and on its effect on the thermo‐mechanical behavior. The experimental characterization of macroporosity is performed using an X‐ray tomography technique. Numerical 3D images…
Pt – ZnO – Pb ( Zr 0.2 Ti 0.8 ) O 3 – Pt (PZT-ZnO) heterostructures were fabricated by using a sol-gel process. Capacitance-voltage measurements performed on a wide temperature range (20–450 K) have revealed the presence of a hysteresis that undergo a change of direction from clockwise at temperatures below 350 K to c…
We examined hydrogen sorption in 1.5 μm thick Mg–Fe–V films, using the binary alloys as baselines. At 200 °C both Mg–V and Mg–Fe–V absorb in tens of seconds, and desorb in tens of minutes. The ternary alloys show minimal kinetic or capacity degradation even after 105 absorption/desorption cycles. Pressure—composition…
Abstract A simple, two‐step aqueous polymerization was introduced to synthesize a polyacrylate (PAC)/polypyrrole (PPy) hydrogel. The hydrogel had a semi‐interpenetrating network (semi‐IPN) structure with a loose, three‐dimensional PAC network and a one‐dimensional PPy conjugated chain. The presence of PPy led to a hig…
Commonalities among the order parameters of the ubiquitous antiferromagnetism present in the parent compounds of the iron arsenide high-temperature superconductors are explored. Additionally, comparison is made between the well established two-dimensional Heisenberg-Ising magnet, ${\text{K}}_{2}{\text{NiF}}_{4}$, and…
A new method is presented to measure capillarity-induced negative pressure. Negative pressures of several bars have been measured for five different liquids (ethanol, acetone, cyclohexane, aniline, and water) over a range of surface tension. Capillary negative pressure was measured in 79 +/- 3 nm silica nanochannels o…
Overexpression of HER-2 accounts for approximately 25% of all breast cancer cases, while 87.7% of HER-2 positive breast cancers are associated with upregulated VEGF. The objective of this study is to explore the combination therapy of blocking HER-2 and VEGF expressions simultaneously using siRNA. This is the first re…
Absorption cross sections ((sigma)abs) of single branched CdSe nanowires (NWs) have been measured by photothermal heterodyne imaging (PHI). Specifically, PHI signals from isolated gold nanoparticles (NPs) with known cross sections were compared to those of individual CdSe NWs excited at 532 nm. This allowed us to dete…
High quality indium arsenide (InAs) and InAs/ZnS, InAs/ZnSe core/shell nanocrystals were synthesized using arsine (AsH 3 ) generated via zinc arsenide (Zn 3 As 2 ) as arsenic precursor. Injection of additional solvent was adopted to control the nucleation. The growth process and different reaction parameters were stud…
In this work, colloidal zinc sulfide nanocrystals, prepared with selected concentrations of manganese(II) ions in the range of 0−2% and stabilized with a polymeric capping agent, were used in the photocatalytic degradation of 2-chlorophenol in aqueous solutions. Particle sizes for the synthesized nanocrystals were det…
Here, we report the experimental realization of a flat near-field lens formed by an array of densely packed crossed metallic wires. It is shown that due to the unusually strong electric response of the inclusions, the metamaterial slab may enhance the deep subwavelength spatial spectrum of a given source. It is experi…
The boundary-value problem of the propagation of Dyakonov-Tamm waves guided by the planar interface between two structurally chiral materials that are identical except for structural handedness was formulated and numerically solved. Detailed analysis showed that either two or three different Dyakonov-Tamm waves can pr…
A new chemical model of supersaturation ( S ) was developed and applied to test for the precipitation of hydromagnesite [Mg 5 (CO 3 ) 4 (OH) 2 ·4H 2 O] in the MgCl 2 −Na 2 CO 3 system in supersaturated solutions over the temperature range of 50−90 °C. Based on the new model with the help of the OLI platform, the conto…
Abstract Terminal piperidinyl‐ and nitro‐functionalized biphenyls, bridged between the 2 and 2′ positions by a variable number of methylene groups, are synthesized and fully characterized. These push‐pull systems with defined and restricted torsion angles between their phenyl rings are ideal model compounds to investi…