Materials Literature
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Helical nanofibers are successfully constructed from suitable self-assembling pseudopeptide-based molecular building blocks. The handedness of these nanofibers can be reversed by using mirror-imaged pseudopeptide-based building blocks. Straight nanofibers are also constructed by modulating the molecular and supramolec…
The phosphitylation of cellulose with 2-chloro-4,4,5,5-tetramethyl-1,3,2-dioxaphospholane [P(II)], is proposed as a means to determine its reactivity via an evaluation of its accessible hydroxyl groups. A variety of cellulose samples were subjected to this phosphitylation reaction, and the consumption of phosphitylati…
CoMnSi and ${\text{CoMnSi}}_{1\ensuremath{-}x}{\text{Ge}}_{x}$ have recently been shown to exhibit negative magnetocaloric properties at a first-order magnetic-field-driven metamagnetic phase transition between a low-temperature antiferromagnetic phase and a high-temperature ferromagnetic phase. We find that doping wi…
In this paper it is presented the fabrication of low loss millimeter wave metamaterials based on patterning on polypropylene substrates by conventional contact photolitography. We study numerically and experimentally the transmission and reflection properties of two dimensional arrays of split ring resonators (SRRs),…
The adsorption of molecular and atomic chlorine on perfect Ag(111) surface has been studied and characterized by means of extensive density-functional-theory calculations. For the molecular adsorption, we find that the dissociation of ${\text{Cl}}_{2}$ proceeds with an almost vanishing barrier. As for the adsorption o…
First-principles calculations reveal two mechanisms that compete to determine the structure of ZnO polar surfaces. One is the electron-counting rule, which favors semiconducting surfaces. The other is the large ZnO cohesive energy, which favors unreconstructed metallic surfaces with $1\ifmmode\times\else\texttimes\fi{…
Single-crystalline yttrium hydroxide nanotubes could be successfully synthesized in large quantities via a metastable nanosheet precursor reacted with sodium hydroxide under hydrothermal conditions. The nanosheet precursors were obtained through a facile hydrothermal synthetic method using soluble yttrium nitrate as t…
A potentially new kind of glass transition may exist among phase-separated regions in ${\text{La}}_{0.215}{\text{Pr}}_{0.41}{\text{Ca}}_{3/8}{\text{MnO}}_{3}$. We have observed a very large damping of ultrasonic waves in the dynamically phase-segregated state of this material. This damping is connected to the motion o…
A method for coating functionalized poly(3,4-ethylenedioxythiophene) (PEDOT) on nonconductive substrates in aqueous solution allows the deposition of PEDOT thin layers on various substrates, including silica and polystyrene (PS) nanoparticles, siliceous mesocellular foam, and chitosan-alginate fibers. The surface prop…
We have studied the dynamics of amorphous 1,4-trans-poly(isoprene) ( trans -PI) with different molecular weights using broadband dielectric spectroscopy over a wide range of temperature ∼ T g − 70 K to T g + 130 K, and frequencies (10 −1 to 10 6 Hz). Avoiding crystallization by quenching, three dielectric processes (g…
Gold, rhodium, and their coadsorbed layers were prepared on a nearly stoichiometric titania surface by physical vapor deposition (PVD) and were characterized by low-energy ion scattering (LEIS) and scanning tunneling microscopy (STM). It was found that because of the strong tendency of Au segregation in the Au−Rh bime…
A persistent photoinduced metal-to-insulator transition has been confirmed in a manganite thin film, Pr_(0.55)(Ca_(0.75)Sr_(0.25))_(0.45)MnO3, near a multicritical point by monitoring with transport measurements and x-ray photoemission spectroscopy. Together with the previously reported reverse effect, the photoinduce…
Cordierite monoliths coated with V 2 O 5 /WO 3 −TiO 2, Fe−ZSM5, and Cu−ZSM5 catalysts were combined to investigate the possibility of combining the advantages of the different single catalysts for the selective catalytic reduction of nitric oxide with ammonia (NO SCR) while minimizing their drawbacks. Selected combina…
In this paper, signal amplifications of surface-enhanced Raman scattering (SERS) are realized by an optofluidic compact disc (CD)-based preconcentration method for effective label-free environmental and biomolecular detections. The preconcentration of target molecules is accomplished through the accumulation of adsorb…
Two approaches to the synthesis of composite carbon nanotube/silica fibers in which the carbon nanotubes are highly aligned are investigated, one involving directly casting and the other using surface modification to induce hydrogen bonding between the carbon nanotubes and a silica precursor. Due to the nanotube align…
Single-crystal 9,10-diphenylanthracene (DPA) nanoribbons and nanorods with uniform sizes and shapes were synthesized via a simple surfactant-assisted self-assembly process. The shape of the as-prepared nanostructures can be readily controlled by varying the solubility of DPA in the preparation solution. A growth mecha…
We apply inverse numerical methods to design compact wideband reflectors in which a periodic silicon layer supports resonant leaky modes. Using particle swarm optimization to determine appropriate device thickness, period, and fill factors, we arrive at example reflector designs for both TE and TM polarized input ligh…
The disclosure of the mechanisms of nanoparticle interaction with specific intracellular targets represents one of the key tasks in nanobiology. Unmodified luminescent semiconductor nanoparticles, or quantum dots (QDs), are capable of a strikingly rapid accumulation in the nuclei and nucleoli of living human cells, dr…
The surface sensitivity of X-ray Magnetic Circular Dichroism in extreme conditions is exploited to investigate the first layers of bulk single-molecule magnets (SMM). Striking differences emerge between two classes of SMM with different structural constraints, thus highlighting the importance of molecular design in th…
Our measured dielectric constant and mechanical response of multiferroic BiFeO3 indicate four phase transitions below room temperature. Features correlate with those reported at 50 K (from a peak in the zero-field-cooled magnetic susceptibility) and 230 K (from splitting between field-cooled and zero-field-cooled magn…