Materials Literature
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We investigate self-assembly of nanocomposite films composed of lamellar-forming poly(styrene- b -methyl methacrylate) (PS- b -PMMA) and PMMA-grafted magnetite (Fe 3 O 4 ) nanoparticles (NPs). The Fe 3 O 4 NPs are grafted with PMMA brushes with molecular weights ranging from 2700 to 35 700 g/mol. For the NP with the l…
The triarylborane acceptor in poly[9-((4-dimesitylboryl)-3,5-dimethylphenyl)-9 H -carbazole]-3,6-diyl P2 has a strong impact on the optical properties of this 3,6-linked carbazole main chain polymer and results in an enhanced fluorescence quantum yield because of a low-lying fluorescent CT state. In contrast, the same…
Hydrothermal reactions of lanthanide oxide, lead chloride, I(2)O(5), and H(2)O at 200 degrees C led to four novel quaternary compounds, namely, Ln(3)Pb(3)(IO(3))(13)(mu(3)-O) (Ln = La-Nd). They are isostructural, and their structures feature a complicated 3D network composed of LaO(9) and PbO(6) polyhedra interconnect…
Magnetic resonance imaging is a powerful clinical imaging technique that allows for noninvasive tomographic visualization of anatomic structures with high spatial resolution and soft tissue contrast. However, its application in molecular imaging of cancer has been limited by the lack of sensitivity and detection accur…
Abstract Dendrimers for ion sensing : The synthesis and use of new tris‐alkynyl dendrons are reported. So‐called “click” reactions of the dendrimers described with azidomethylferrocene give 27‐ferrocenyl, 81‐ferrocenyl, and 243‐ferrocenyl dendrimers. Electrochemical recognition of oxo‐anions and Pd 2+ cations has been…
Antiferromagnetic ordering and structural phase transition have been investigated via comprehensive neutron and x-ray diffraction on Sn-flux-grown ${\text{BaFe}}_{2}{\text{As}}_{2}$ single crystals, the $A\text{\ensuremath{-}}122$ family of FeAs-based high-${T}_{C}$ superconductor compounds. The incorporation of Sn in…
An analytic theory of ballistic electron transport in disordered graphene in ``short-and-wide'' geometry is developed. We consider a sample of a large width $W$ and analyze the evolution of the conductance, the shot noise, and the full statistics of the charge transfer with increasing length $L$ both at the Dirac poin…
The thermal boundary conductance is derived for the heat flow between the electrons in a metal and the phonons in an ionic crystal. The image potential generated by the ion charges makes a regular pattern of surface charges on the surface of the metal. When the ions vibrate, these surface charges oscillate. Since the…
Texture-controlled growth of ZnO films on substrates of general materials at room temperature by pulsed laser deposition was demonstrated. The texture of the film changed progressively from (001) to (110) to (100) as the laser fluence increased from 2 J cm(-2) up to 45 J cm(-2). Application of the textured films on Si…
A metal-organic polyhedral network with a unique 5-connected topology is expanded into a series using different metal ions or dicarboxylate ligands. The prototype material (ZmID), [Zn(4)(mip)(4)(dabco)(OH(2))(2)] (mip = 5-methylisophthalate, dabco = diazabicyclo[2.2.2]octane), is based on 5-connecting paddlewheel moti…
Utilizing the self-assembled core-shell-type polymeric micelle technique, high-performance nanoparticles possessing stable radicals in the core and reactive groups on the periphery were prepared. The anionic ring-opening polymerization of ethylene oxide (EO) was carried out using potassium 3,3-diethoxypropanolate as a…
We present first-principles calculations of quantum transport in chemically functionalized metallic carbon nanotubes with lengths reaching the micrometer scale and random distributions of functional groups. Two typical cases are investigated, namely, a sp2-type bonding between carbene groups (CH2) and the nanotube sid…
A number of current theories of plasticity in amorphous solids assume at their basis that plastic deformations are spatially localized. We present in this paper a series of numerical experiments to test the degree of locality of plastic deformation. These experiments increase in terms of the stringency of the removal…
Ultrafast ET with a characteristic time constant of approximately 70 fs between CdSe QDs (mean radii of 1.4 nm) photoexcited in the lowest 1S electron state (lambda(exc) = 539 nm), and the molecular electron acceptor MV(2+) adsorbed on the QD surface was observed. The photophysics of such a system was investigated by…
Polyhedral nanocrystals of -Fe2O3 are successfully synthesized by annealing FeCl3 on silicon substrate at 1000 oC in the presence of H2 gas diluted with argon (Ar). Uniformly shaped polyhedral nanoparticles (diameter ~50-100 nm) are observed at 1000 oC and gases flow rate such as; Ar = 200 ml/min and H2 = 150 ml/min.…
Well-controlled poly(N-vinylpyrrolidone) (PVP)-grafted silicon surfaces were prepared by surface-initiated atom transfer radical polymerization (SI-ATRP) with 1,4-dioxane/water mixtures as solvents and CuCl/5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane (Me6TATD) as a catalyst. The thickness of the PVP la…
We derive the analytic expressions of the electromagnetic force and torque on a dipolar particle, with arbitrary dielectric permittivity and magnetic permeability. We then develop a general framework, based on the coupled dipole method, for computing the electromagnetic force and torque experienced by an object with a…
We demonstrate that focused laser excitation at the end of silver nanowires of 50-150 nm diameter excites SERS hot-spots at points of nanoparticle adsorption many micrometers along the wire due to the plasmon waveguide effect. The total SERS intensity detected at the hot-spots following wire-end excitation correlates…
{\tt yambo} is an {\it ab initio} code for calculating quasiparticle energies and optical properties of electronic systems within the framework of many-body perturbation theory and time-dependent density functional theory. Quasiparticle energies are calculated within the $GW$ approximation for the self-energy. Optical…
Monolithic structures can be built into graphene by the addition and subsequent re-arrangement of carbon atoms. To this end, ad-dimers of carbon are a particularly attractive building block because a number of emerging technologies offer the promise of precisely placing them on carbon surfaces. In concert with the mor…