Materials Literature
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Evanescent probe imaging is a powerful characterization technique with subwavelength resolution. In this paper, we present a theoretical and numerical study of the effect of using double negative (DNG) and single negative (SNG) metamaterials in evanescent probe imaging. A sensitivity definition is introduced for evane…
The standard T-matrix method can be effectively used for studying the dynamics of Dirac electrons under one-dimensional potentials in graphene. The transmission probability expressed in terms of T-matrices and the corresponding ballistic current are derived for any smooth one-dimensional potential, taking into account…
Abstract A new diiodo monomer containing heterocyclic pyridine and carbazole groups was synthesized via Chichibabin reaction and used in the preparation of a conjugated polymer via Suzuki coupling approach. The conjugated polymer was highly soluble in common organic solvents such as NMP, THF, dichloromethane, chlorofo…
In this paper we report calculations based on an all electron ab initio full-potential linearized augmented plane-wave method using the generalized gradient approximation within the density functional theory to determine the structures of Ti(2)SnC, Zr(2)SnC, Hf(2)SnC and Nb(2)SnC. The lattice constants obtained after…
The compositional parameter space in the formation of polynuclear clusters is probed in the synthesis of a series of dodecanuclear coordination clusters of Ni(II) and Co(II) with isostructural D(3h)-symmetric frameworks. At the core of their construction are a carbonate template and the directing ligands cis,trans-1,3…
Abstract Core‐shell type star polymers composed of poly( tert ‐butyl acrylate) (poly( t ‐BuA)) arms and 100% hyperbranched poly(arylene‐oxindole) interiors were synthesized via the “core‐first” method. Atom transfer radical polymerization of t ‐BuA initiated by 2‐bromopropionyl terminal groups of the hyperbranched cor…
Properties of ${\text{BiFeO}}_{3}$ under high magnetic fields applied in the plane perpendicular to the polarization are investigated via an original first-principles-based effective Hamiltonian. Different phenomena are found, depending if the magnetic fields lie (a) along the initial direction of the antiferromagneti…
The temperature dependence of ferroelectric domain nucleation in epitaxial films of BiFeO3 is studied using variable temperature ultrahigh vacuum piezoresponse force spectroscopy in the 50 to 300 K temperature range. The nucleation bias corresponding to the onset of local ferroelectric switching in the volume of an el…
Hemicyanine dye molecules were put into the nanoporous materials (silicalite-1, zeolite-beta, and MCM-41) with different pore sizes. Fluorescence anisotropy measured from these systems indicated that the incorporated dye molecules were well-aligned along the straight channel of the zeolite pores, except for dye molecu…
Abstract This article presents the synthesis and initial characterization of polymers having a high molecular weight dendritic ( arborescent ) polyisobutylene ( arb PIB) core and short end sequences composed of copolymers of isobutylene with isoprene, p‐ methyl styrene, or cyclopentadiene. The first stage of the polym…
Alanine (13)CH(3) methyl groups can serve as a useful addition to the Ile, Leu, Val (ILV) selective isotope labeling methodology adopted for NMR studies of high-molecular-weight protein systems. A four-dimensional (4D) methyl-detected "out-and-back" NMR experiment has been developed that allowed us to obtain practical…
β-Bromo glycerol monoethers, when heated with pyridine at 100 °C for 10 h, gave a new glycerol-based pyridinium cationic surfactant, 1-(1-(2,3-dihydroxypropoxy)alkane-2-yl)pyridinium bromide ( 6a − 10a )/1-(2-(2,3-dihydroxypropoxy)alkyl)pyridinium bromide ( 6b − 10b ) in a yield of 60%−70%. The surface properties and…
We present a full configuration interaction study of Be(N) (N=2,3,4,5) linear chains. A comparative study of the basis-set effect on the reproduction of the energy profile has been reported. In particular, the 3s1p, 4s2p, 4s2p1d, 5s3p2d, and 5s3p2d1f bases were selected. For the smallest chains (i.e., Be(2) and Be(3))…
Biofunctionalized surfaces based on dendronized cellulose were prepared either by embedding 6-deoxy-6-(1,2,3-triazolo)-4-polyamidoamine (PAMAM) cellulose (degree of substitution, DS 0.25), obtained by homogeneous conversion of 6-deoxy-6-azido cellulose with propargyl-PAMAM dendron via the copper-catalyzed Huisgen reac…
We used density functional theory calculations to probe the chemical reactivity of graphene and single-wall carbon nanotubes (CNTs) toward the small molecules O(2), H(2), N(2), C(2)H(2), CO, and CO(2). We found that there is a threshold CNT size below which C(2)H(2) and CO, typical feedstock precursors for CNT growth,…
Abstract We report on a new strategy for fabricating well‐defined POSS‐based polymeric materials with and without solvent by frontal polymerization (FP) at ambient pressure. First, we functionalize polyhedral oligomeric silsesquioxane (POSS) with isophorone diisocyanate (IPDI). With these functionalized POSS‐containin…
A one-step method combining spray pyrolysis and thermal chemical vapor deposition (CVD) processes was developed to grow hybrid carbon nanotube (CNT)-bimetallic composite particles. Nickel, aluminum, and acetylene were used as the catalytic site, noncatalytic matrix, and hydrocarbon source, respectively. The bimetallic…
Low-lying isomers of homoleptic gold thiolate clusters (AuSR)(N) (N = 6-12) are studied by using a global-minimum search method. Besides previously known zigzag crown structures for (AuSR)(N) (N = 6-12) and catenane structures for (AuSR)(N) (N = 10, 12), onset of a new structural family of double helical structures in…
Abstract Co(OH) 2 that blooms : Flowerlike hollow spherical architectures of cobalt hydroxide obtained through a facile solvothermal process are reported for the first time (see picture). Their growth process involves aggregation of cobalt hydroxide nanoparticles into solid spheres and a hollowing effect through subse…
Abstract Kinetics of the anionic ring opening copolymerization of 2,4,6‐tris(3,3,3‐trifluoropropyl)‐2,4,6‐trimethylcyclotrisiloxane (F 3 ) with hexamethylcyclotrisiloxane (D 3 ) was studied in THF using BuLi as the initiator. The apparent reactivity ratios were estimated by computer simulation to r = 0.10 ± 0.02, r =…