Materials Literature
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We present a study of the spatial structure of cationic cylindrical polymer brushes in the presence of counterions of different valencies. Dynamic light scattering (DLS), atomic force microscopy (AFM) and cryogenic transmission electron microscope (cryo-TEM) studies demonstrate that the brushes undergo a transition fr…
We use first-principles density-functional theory calculations to determine the vibrational properties of ultrathin $n(1,2,\dots{},7)$-layer graphene films and present a detailed analysis of their zone-center phonons. We demonstrate that a low-frequency $(\ensuremath{\sim}112\text{ }{\text{cm}}^{\ensuremath{-}1})$ opt…
We report calculated Raman spectra of the D and 2D modes in graphene and graphite. Evaluating the Raman amplitude in the two-dimensional Brillouin zone, we reproduce the splitting of the modes when going from single-layer graphene to graphite. The energy dependence of the D mode in graphene is 24%--32% smaller than in…
We present a low-temperature (∼300 °C) process for preparing transparent conducting anatase Nb-doped TiO 2 (TNO) polycrystalline films by sputtering. We first deposited amorphous films composed of an oxygen-rich bottom layer and oxygen-deficient top layer at room temperature. These films were then crystallized in a re…
Chiral tunneling through a harmonically driven potential barrier in a graphene monolayer is considered in this work. Since the charge carriers in this system are massless, chiral Dirac particles, tunneling is described as Klein tunneling and is highly anisotropic. To study Klein tunneling through a harmonically driven…
Assembling [W(CN) 6(bpy)] (-) and magnetic anisotropic Mn Schiff bases produced two Mn (III)(3d)-W (V)(5d) bimetallic chains. Modulation of the types and degrees of interchain pi-pi interactions in the one-dimensional coordination polymers leads to the variation of the magnetic behavior from a metamagnetic character t…
From a suitably broad perspective, transition metal corroles may be viewed as stable, synthetic analogues of high-valent heme protein intermediates such as compounds I and II. Against this backdrop, the electronic structure of chloroiron corrole has provoked a lively debate in recent years. Thus, whereas NMR spectrosc…
The effects of treatment with hydrochlorothiazide combined with amiloride were compared to hydrochlorothiazide treatment alone in 2 brothers with congenital nephrogenic diabetes insipidus. Whereas both modalities of treatment resulted in reduction in voiding frequency and urine volume, decrease in daily fluid intake a…
The terrace formation behavior of chloroform vapor annealed thin films of asymmetric, low molecular weight comb-shaped supramolecules consisting of a short polystyrene (PS) block and a long supramolecular block of poly(4-vinylpyridine) (P4VP) hydrogen bonded with pentadecylphenol (PDP) on silicon oxide (SiO 2 ) was ex…
The dynamical behavior of the magnetism of diluted magnetic semiconductors (DMSs) has been investigated by means of atomistic spin-dynamics simulations. The conclusions drawn from the study are argued to be general for DMS systems in the low-concentration limit, although all simulations are done for 5% Mn-doped GaAs w…
Gold growth onto CdSe seeded CdS nanorods is studied. Preferential growth of gold onto the position of the CdSe seed is identified. The mechanism of growth is assigned to an electrochemical Ostwald ripening process.
We report approximately 22 dB of Raman gain in single mode As(2)Se(3) chalcogenide glass fiber using 15 ps optical pump pulses from 1470 nm to 1560 nm. We employ a novel technique of cross-phase modulation induced sideband amplification to map out the Raman gain spectrum of this glass, and investigate the role of both…
We present the results of numerical simulations of a $(2+1)$-dimensional fermion field theory based on a recent proposal for a model of graphene consisting of ${N}_{f}$ four-component Dirac fermions moving in the plane and interacting via an instantaneous Coulomb interaction. In the strong-coupling limit we identify a…
Monodisperse spherical hollow nanoparticles of mesoporous silica featuring mesopores with a radial orientation in the silica shell were synthesized via a dual-templating method. Specifically designed polystyrene latexes with anionic or cationic surface charges acted as the core templates, while cetyltrimethylammonium…
We report the synthesis of Tm 3+ /Yb 3+ /Er 3+ -doped Lu 3 Ga 5 O 12 nanocrystals prepared by a simple sol−gel method exhibiting bright white light following excitation with lower energy near-infrared light (λ exc = 980 nm) via an upconversion process. The combination of upconverted blue (from Tm 3+ ), green, and red…
We report the design, fabrication and optical investigation of electrically tunable single quantum dot - photonic crystal defect nanocavities operating in both the weak and strong coupling regimes of the light matter interaction. Unlike previous studies where the dot-cavity spectral detuning was varied by changing the…
We present a combination of ab initio calculations, magnetic Compton scattering and polarized neutron experiments, which elucidate the density distribution of unpaired electrons in the kagome staircase system Co3V2O8. Ab initio wave functions were used to calculate the spin densities in real and momentum space, which…
We investigate vibration modes and their Raman activity of single-walled carbon nanotubes that are bent within their intrinsic elastic limits. By implementing wedge boundary conditions for density-functional-based tight binding, and using nonresonant bond polarization theory, we discover that Raman activity can be ind…
A cell dynamics method for domain separation of diblock copolymers (DBCPs) interacting with nanoparticles (NPs) whose diffusion coefficients depend on chain configuration is proposed for self-assembly of DBCP/NP composites. Increasing NP concentration slows down domain separation, but matching NP diffusion lengths and…
Near ballistic n-type single-walled carbon nanotube field-effect transistors (SWCNT FETs) have been fabricated with a novel self-aligned gate structure and a channel length of about 120 nm on a SWCNT with a diameter of 1.5 nm. The device shows excellent on- and off-state performance, including high transconductance of…