Materials Literature
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A structurally fascinating Keplerate magnetic cluster featuring an icosidodecahedron of Ni(II) ions encapsulating a dodecahedron of La(III) ions was assembled under hydrothermal conditions starting with La(NO 3 ) 3, Ni(NO 3 ) 2, and iminodiacetic acid. The cage-like arrangement of the two distinct sets of metal ions m…
Abstract Nanotechnology has become in recent years a topic of great interest to scientists and engineers, and is now established as prioritized research area in many countries. The reduction of the size to the nanometer range brings an array of new possibilities in terms of material properties, in particular with resp…
The transition between the Cassie and Wenzel wetting regimes has been observed under vertical vibration of a water drop placed on a rough micrometrically scaled polymer pattern. The transition takes place under the constant force per unit length of the triple contact line, not under constant pressure. A study of the v…
We report on the unusual nature of the $\ensuremath{\nu}=0$ state in the integer quantum Hall effect (QHE) in graphene and show that electron transport in this regime is dominated by counterpropagating edge states. Such states, intrinsic to massless Dirac quasiparticles, manifest themselves in a large longitudinal res…
We demonstrate the room-temperature control of magnetization reversal with an electric field in an epitaxial nanostructure consisting of ferrimagnetic nanopillars embedded in a ferroelectric matrix. This was achieved by combining a weak, uniform magnetic field with the switching electric field to selectively switch pi…
We report infrared studies of the Landau level (LL) transitions in single layer graphene. Our specimens are density tunable and show in situ half-integer quantum Hall plateaus. Infrared transmission is measured in magnetic fields up to B=18 T at selected LL fillings. Resonances between hole LLs and electron LLs, as we…
We employ scanning probe microscopy to reveal atomic structures and nanoscale morphology of graphene-based electronic devices (i.e., a graphene sheet supported by an insulating silicon dioxide substrate) for the first time. Atomic resolution scanning tunneling microscopy images reveal the presence of a strong spatiall…
The dynamical dielectric function of two-dimensional graphene at arbitrary wave vector $q$ and frequency $\ensuremath{\omega}$, $ϵ(q,\ensuremath{\omega})$, is calculated in the self-consistent-field approximation. The results are used to find the dispersion of the plasmon mode and the electrostatic screening of the Co…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTPolymerization-Induced Phase Separation of Styrene and Its Derivatives: Rarity of Crystal-like Array FormationXin Wang, Mamoru Okada, and Charles C. HanView Author Information State Key Laboratory of Polymer Physics and Chemistry, Joint Laboratory of Polymer Science and Materia…
Abstract Electron absorption, excitation and emission spectra have been measured for Cr 3+ ion‐doped NaMg 3 Al(MoO 4 ) 5 crystal in the temperature range from 9 to 300 K. The sharp lines of the 2 E– 4 T 2 emission and broadband 4 T 2 – 4 A 2 luminescence from strong and weak crystal field Cr 3+ sites as well as their…
Hydroformylation of 6-methoxy-2-vinylnaphthalene (MVN), using homogeneous Rh(CO) 2 (acac) as a catalyst and a chelating bidentate ligand (1,2-bis-(diphenylphosphino) ethane, dppe), followed by oxidation of the product (2-(6-methoxynaphthyl) propanal, 2-MNP) has been studied as an alternative route for the synthesis of…
Negatively charged sodium auride clusters, NanAun- (n = 1-3), have been investigated experimentally using photoelectron spectroscopy and ab initio calculations. Well-resolved electronic transitions were observed in the photoelectron spectra of NanAun- (n = 1-3) at several photon energies. Very large band gaps were obs…
A semiconductive charge-transfer solid was prepared by the reaction of cytosine and TCNQ. Cytosine molecules formed a hemiprotonated cytosine pair by complementary triple hydrogen bonds, and the pairs were then linked by complementary double hydrogen bonds to form infinite ribbons. TCNQ molecules formed uniform segreg…
The authors have reported the electrical conductivity and the conductivity relaxation in mixed alkali tellurite glasses of compositions of 70TeO2-xNa2O-(30-x)Li2O in the frequency range from 10 Hz to 2 MHz and in the temperature range from room temperature to just below the glass transition temperature. They have anal…
A new, entirely aqueous method for the deposition of ferroelectric lanthanum substituted bismuth titanate including cosubstitution of Ti 4+ with higher valent metal ions (W 6+, Mo 6+, Nb 5+, and V 5+ ) is presented. The strong tendency toward hydrolysis and condensation of highly valent metal ions, causing precipitati…
The authors report the first theoretical study on the hexa-atomic molecules CAl(4)X (X=Si,Ge) at the B3LYP/6-311++G(2d), MP2/6-311++G(2d), and CCSD(T)/6-311++G(3df) (single point) levels. Three low-lying isomers (within 2.0 kcal/mol) can be formally viewed as constructed by one Al+ interacting with the planar CAl3X- a…
A detailed characterization of platinum- and gold-diamondlike carbon (DLC) nanocomposite films deposited onto silicon substrates is presented. A modified pulsed laser deposition (PLD) technique was used to incorporate noble metal nanoclusters into hydrogen-free DLC films. Several analytical techniques, including trans…
Abstract Raman and photoluminescence of CdS nanowires of diameter 80 nm and lengths up to several tens of micrometers were studied at pressure up to 60 kbar using a Jobin‐Yvon T64000 micro‐Raman system in conjunction with the diamond‐anvil cell technique. The phase transition pressure of wurtzite to rock salt was obse…
One layer at a time: The sequential pulsed-laser deposition of CaO rock-salt and CaMnO3 perovskite layers on an SrTiO3 substrate allows the growth of the metastable n=4, 5, and 6 members of the Can+1MnnO3n+1 Ruddlesden–Popper series (see high-resolution TEM image of Ca5Mn4O13). The growth process is monitored using re…
A series of copper(II) salen complexes containing 4-substituted alkoxy chains of aromatic rings [Cu((4-C n H2n+1O)2salen)] (n = 3 ( 1 ), 4 ( 2 ), 6 ( 3 ), 8 ( 4 ), 10 ( 5 ), 12 ( 6 ), 14 ( 7 ), 16 ( 8 ), 18 ( 9 ), and 20 ( 10 ) and salen (N,N'-ethylenebis(salicylideneiminato)) has been prepared, and single-crystal str…