Materials Literature
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We measure the low-field Hall resistivity of a magnetically-doped two-dimensional electron gas as a function of temperature and electrically-gated carrier density. Comparing these results with the carrier density extracted from Shubnikov-de Haas oscillations reveals an excess Hall resistivity that increases with decre…
We report the Rb nuclear magnetic resonance (NMR) results in a recently synthesized Na5RbCu4(AsO4)Cl2. This complex novel two-dimensional (2D) cuprate is an unique magnetic material, which contains layers of coupled Cu4O4 tetramers. In zero applied magnetic field, it orders antiferromagnetically via a second-order low…
We have studied the dielectric properties of the ferromagnetic spinel $\mathrm{Cd}{\mathrm{Cr}}_{2}{\mathrm{S}}_{4}$ from first principles. Zone-center phonons and Born effective charges were calculated by frozen-phonon and Berry phase techniques within $\mathrm{LSDA}+U$. We find that all infrared-active phonons are q…
C 1s XPS spectra of various highly oriented pyrolytic graphite (HOPG) surfaces, untreated, as well as those treated by keV Ar+ beam bombardment and low-energy O2, N2, Ar, and H2O plasmas, have been systematically studied by comparing two XPS peak-fitting procedures. These procedures treat the spectrum as either (1) th…
Lamellar single crystals grown in dilute solutions can be used as templates for tethered chain analysis. Two series of diblock copolymers, poly(ethylene oxide)- block -polystyrene (PEO- b -PS) and poly( l -lactic acid)- block -polystyrene (PLLA- b -PS), were used as model templates to generate tethered PS blocks on th…
The thermal conductance of interfaces between Al and Cu is measured in the temperature range $78<T<298\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ using time-domain thermoreflectance. The samples are prepared by magnetron sputter deposition of a $100\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ thick film of Al on top of la…
A twist to the right, or to the left: Both enantiomers of a new chiral material were synthesized by a rational approach, using enantiopure proline ligands, copper cations, and Keggin polyoxometalate anions as building blocks. The compounds have open-framework structures containing helical channels.
Abstract Summary: A responsive polymer composite film was generated by the use of reversibly switchable surface morphology of polystyrene‐ block ‐poly(methyl methacrylate) (PS‐ b ‐PMMA) films in response to different block selective solvents on the rough isotactic poly(propylene) (i‐PP) substrate. The maximum differen…
Abstract— A surface‐conduction electron emitter (SCE) for next‐generation flat‐panel displays has been developed. PdO thin films (approximately 10 nm thick) produced by an ink‐jet process were used to form the surface‐conduction electron emitter. The films were electroformed and activated while a voltage was applied,…
In this work we present magnetization data on hybrids consisting of multilayers (MLs) of manganites ${[{\mathrm{La}}_{0.33}{\mathrm{Ca}}_{0.67}\mathrm{Mn}{\mathrm{O}}_{3}∕{\mathrm{La}}_{0.60}{\mathrm{Ca}}_{0.40}\mathrm{Mn}{\mathrm{O}}_{3}]}_{15}$ in contact with a low-${T}_{c}$ Nb superconductor (SC). Although a pure…
We report on first principles self-interaction corrected LSD (SIC-LSD) calculations of electronic structure of LaMnO 3 in the cubic phase. We found a strong tendency to localization of the Mn e g electron and to orbital ordering. We found the ground state to be orbitally ordered with a staggered order of x 2 − z 2 and…
Abstract Summary: Continuous cold Ar plasmas were used to activate the mercerised cotton fabric towards surface‐initiated graft polymerisation of glycidyl methacrylate, 2‐hydroxyethyl methacrylate (HEMA) and 1,1,2,2‐tetrahydroperfluorodecyl methacrylate (XFDMA). Single and multi‐step processes, carried out either in t…
Optical heterodyne-detected optical Kerr effect (OHD-OKE) experimental data are pre-sented on nematogens 4-(trans-4-n-octylcyclohexyl)isothiocyanatobenzene (8-CHBT), and 4-(4-pentyl-cyclohexyl)-benzonitrile (5-PCH) in the isotropic phase. The 8-CHBT and 5-PCH data and previously published data on 4-pentyl-4-biphenylca…
Abstract Summary: Self‐consistent field (SCF) theory is developed for a polymer brush immersed into a multi‐component solvent. Thermodynamics of the plane inhomogeneous brush is mainly determined by thermodynamics of the basic system, i.e., a homogeneous solution of a polymer dissolved in a multi‐component solvent tha…
Shape memory alloys (SMAs) are used in a wide variety of applications including medical stents, couplings, actuators, jointless monolithic structures for actuation and manipulation, etc. Due to the SMA’s poor machinability it is advantageous to use rapid prototyping (RP) techniques for the manufacturing of SMA structu…
Abstract Summary: In the present study, electrospinning of hyaluronic acid (HA) and hyaluronic acid/gelatin (HA‐GE) blends in N , N ‐dimethylformamide (DMF)/water‐mixed solvents have been investigated. When the volume ratio of DMF to water was in the range of 1.5–0.5, HA solutions could be electrospun into fibrous mem…
Given the effectiveness of semiconductor devices for classical computation one is naturally led to consider semiconductor systems for solid state quantum information processing. Semiconductors are particularly suitable where local control of electric fields and charge transport are required. Conventional semiconductor…
We theoretically demonstrate that a dipole layer on the electrode can modulate the transmission properties of nanoscale devices by influencing the contact properties, through first principles simulations on carbon nanotube based field effect transistors. The dipole layer is realized by potassium adsorption on Au elect…
The performance of a wide variety of ultra-sensitive devices employing nanoelectromechanical resonators is determined by their mechanical quality factor, yet energy dissipation in these systems remains poorly understood. Here we develop a comprehensive theory of friction in high frequency resonators caused by the radi…
Molecular Dynamics (MD) computer simulations are utilized to better understand the escape of neon from small (N=5) endohedral Ne@C60 clusters. Multiple runs at various temperatures are used to increase the reliability of our statistics. The cluster holds together until somewhere between T = 1150K and T = 1200K, where…