Materials Literature
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We present thermoelectric measurements on pentacene field-effect transistors. We report high values of the Seebeck coefficient at room temperature between 240 and $500\phantom{\rule{0.3em}{0ex}}\ensuremath{\mu}\mathrm{V}∕\mathrm{K}$ depending on the dielectric surface treatment. These values are independent of the thi…
Lead-free piezoelectric K 0.5 Na 0.5 NbO 3 thin films for microelectromechanical systems were fabricated via chemical solution process using metal alkoxide. Perovskite K 0.5 Na 0.5 NbO 3 (KNN) single-phase thin films with good leakage current properties were successfully prepared by optimizing the K x Na x NbO 3 ( x ≧…
We analyze the collective mode spectrum of graphene nanoribbons within the random phase approximation. In the undoped case, only metallic armchair nanoribbons support a propagating plasmon mode. Landau damping of this mode is shown to be suppressed through the chirality of the single particle wave functions. We argue…
Cooperative crystals: In ferroelectric cocrystals of iodanilic acid (see picture, orange) and 5,5′-dimethyl-2,2′-bipyridine (green), the molecules are linked into polar chains by OH⋅⋅⋅N and N+H⋅⋅⋅O− hydrogen bonds. The application of a small electric field (E) effects a cooperative proton transfer across the hydroge…
We present a bond-order potential (BOP) for the bcc transition metal tungsten. The bond-order potentials are a real-space semiempirical scheme for the description of interatomic interactions based on the tight-binding approximation. In the hierarchy of atomic-scale-modeling methods the BOPs thus provide a direct bridg…
Understanding the fundamental properties of polymeric liquids remains a challenge in materials science and soft matter physics. Here, we present a simple and computationally efficient criterion for topological constraints, i.e., uncrossability of chains, in polymeric liquids using the dissipative particle dynamics (DP…
We present a quantitative investigation of the impact of tip radius as well as sample type and thickness on the lateral resolution in piezoresponse force microscopy (PFM) investigating bulk single crystals. The observed linear dependence of the width of the domain wall on the tip radius as well as the independence of…
Nanoparticulate Drug Delivery Systems: An Overview. Nanosuspensions for Parenteral Delivery. Nanoparticles Prepared Using Natural and Synthetic Polymers. Nanofiber-based Drug Delivery. Drug Nanocrystals: The Universal Formulation Approach for Poorly Soluble Drugs. Lipid Based Nanoparticulate Drug Delivery Systems. Nan…
In nanocrystalline metals, lack of intragranular dislocation sources leads to plastic deformation mechanisms that substantially differ from those in coarse-grained metals. However, irrespective of grain size, plastic deformation is considered irrecoverable. We show experimentally that plastically deformed nanocrystall…
Thermal conductivity of thin silicon nanowires (1.4-8.3 nm) including the realistic crystalline structures and surface reconstruction effects is investigated using direct molecular dynamics simulations with Stillinger-Weber potential for Si-Si interactions. Thermal conductivity as a function of decreasing nanowire dia…
A set of symmetric and asymmetric superlattices with ferromagnetic La0.6Sr0.4MnO3 and ferroelectric 0.7Pb(Mg0.33Nb0.67)O3 0.3(PbTiO3) as the constituting layers were fabricated on LaNiO3 coated (100) oriented LaAlO3 substrates using pulsed laser ablation. The crystallinity, magnetic and ferroelectric properties were s…
We report a first-principles study on electronic structures of the deformed armchair graphene nanoribbons (AGNRs). The variation of the energy gap of AGNRs as a function of uniaxial strain displays a zigzag pattern, which indicates that the energy gaps of AGNRs can be effectively tuned. The spatial distributions of tw…
A statistical mechanical framework elucidates the significance of structural correlations between coarse-grained (CG) sites in the multiscale coarse-graining (MS-CG) method (Izvekov, S.; Voth, G. A. J. Phys. Chem. B 2005, 109, 2469; J. Chem. Phys. 2005, 123, 134105). If no approximations are made, then the MS-CG metho…
The Raman spectra of epitaxial thin films of ${\mathrm{La}}_{2}\mathrm{Co}\mathrm{Mn}{\mathrm{O}}_{6}$ on (001)-oriented $\mathrm{Sr}\mathrm{Ti}{\mathrm{O}}_{3}$ substrates have been measured in several exact scattering configuration between 12 and $890\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. The polarization dependenc…
Heterogeneous oxidation of gas-phase SO 2 on different iron oxides was investigated in situ using a White cell coupled with Fourier transform infrared spectroscopy (FTIR) and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The results revealed that adsorbed SO 2 could be oxidized on the surface o…
Hybrids of single-walled carbon nanotubes (SWNTs) and β-cyclodextrins (β-CDs) were prepared by π−π interaction between pyrene modified β-CDs and SWNTs. Moreover, chemically responsive supramolecular SWNT hydrogel was constructed using host−guest interactions by means of hybrids of SWNTs and β-CDs.
Two SiC‐containing metal diborides materials, classified in the ultra‐high‐temperature ceramics (UHTCs) group, were fabricated by hot‐pressing. SiC, sinterability apart, promoted resistance to oxidation of the diboride matrices. Both the compositions, oxidized in air at 1450°C for 1200 min, had mass gains lower than 5…
Gate-modulated transport through partially aligned films of single-walled carbon nanotubes (SWNTs) in thin film type transistor structures are studied experimentally and theoretically. Measurements are reported on SWNTs grown by chemical vapor deposition with systematically varying degrees of alignment and coverage in…
Lock up your gold: Polymer-incarcerated gold nanoclusters (PI Au) were synthesized by microencapsulation of gold nanoclusters and cross-linking using a copolymer based on polystyrene (see TEM image). The nanoclusters could be used to catalyze the aerobic oxidation of alcohols to aldehydes and ketones under atmospheric…
Single-walled carbon nanotubes (SWNTs) exhibit advanced electrical and surface properties useful for high performance nanoelectronics. Important to future manufacturing of nanotube circuits is a large-scale assembly of SWNTs into aligned forms. Despite progress in assembly and oriented synthesis, pristine SWNTs in ali…