Materials Literature
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The phase behavior of symmetric polystyrene- block -poly( n -butyl- ran - n -hexyl) methacrylate copolymers (PS- b -Pn(B- r -H)MA) with various molecular weights was investigated by small-angle X-ray scattering (SAXS), rheometry, polarized optical microscopy (POM), and static birefringence. PS- b -PnBMA exhibited a lo…
The influences of active species Fe-Co composition on the growth of carbon nanotubes (CNTs) were systemically investigated. CNTs were grown from the pyrolytic decomposition of C(2)H(2) over Fe-Co/CaCO(3) catalysts by radio frequency chemical vapor deposition (CVD). The catalyst stoichiometry was found to strongly infl…
Fe(m)(coronene)(n) (m=1,2, n=1,2) cluster anions were generated by a laser vaporization source and studied by anion photoelectron spectroscopy. Density functional theory was used to calculate the structures and the spin multiplicities of those clusters as well as the electron affinities and photodetachment transitions…
Abstract In addition to g = 2.00 signals seen frequently in EPR spectra of SWNT, signals at g = 2.07 of SWNT prepared by CVD were detected, exhibiting a Pauli susceptibility temperature dependence. This Pauli magnetism in combination with the large g shift is taken as evidence that these signals originate from itinera…
Self-assembled monolayers (SAMs) on gold containing a thermo-responsive poly( N-isopropylacrylamide)-poly(ethylene glycol)-thiol copolymer were formed. These layers show considerable potential for inducing enzyme-free and gentle detachment of cultivated cells. In an effort to optimize detachment of cells, including st…
We show through polarized light scattering experiments the spatially inhomogeneous orientational dynamics for shear-thinning wormlike micellar gels (cetyltrimethylammonium tosylate+sodium chloride+H2O ) en route to rheochaos. For shear rates in the plateau of the flow curve, we see alternating bright and dark birefrin…
Optical absorption measurements of Nd(3+) ions in single crystals of [Nd(hfa)(4)(H(2)O)](N(C(2)H(5))(4)) (hfa = hexafluoroacetyloacetonate), denoted Nd(hfa) for short, have been carried out at 4.2 and 298 K. This compound crystallizes in the monoclinic system (space group P 2(1)/n). Each Nd ion is coordinated to eight…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTArborescent Amphiphilic Copolymers as Templates for the Preparation of Gold NanoparticlesJason Dockendorff†, Mario Gauthier*†, Ahmed Mourran‡, and Martin Möller‡View Author Information Department of Chemistry, Institute for Polymer…
The self-assembly of poly(styrene- alt -dimethyl- N, N -propylamide) (SMI) polymers into nanotubes was studied using semiempirical PM3 calculations. Ordered polymer self-assembly results from π-stacking of styrenes and van der Waals interactions between the maleimide chains. Every styrene, and half of the maleimide ch…
Abstract The use of chemotherapeutic agents is nowadays limited by the damage they inflict to healthy tissues. Due to the fact that Carbon nanotubes (CNTs) possess the characteristic feature of being not degraded in the human body, they can be used to deliver small organic drug molecules into the diseased cells thus p…
Abstract In this study, we evaluate the possibility of achieving horizontal carbon nanotube (CNT) growth for application as global interconnects in VLSI integrated circuits. A test structure suitable for electrical characterization has been designed and fabricated to assess horizontal CNT growth. Catalyst placement on…
This paper reports on the steady state and transient photoconductivity of Ge 20 Se 70− x In 10 Bi x ( x = 2, 4, 6, 8, 10) thermally evaporated thin films. The dark conductivity (σ d ) increases with the increase in the Bi content. The value of σ d increases slowly from x = 2 to x = 6, but for x ⩾ 8 the increase is qui…
We report on an investigation of the double-layer manganite series ${({\text{La}}_{1\ensuremath{-}z}{\text{Pr}}_{z})}_{1.2}{\text{Sr}}_{1.8}{\text{Mn}}_{2}{\text{O}}_{7}$ $(0\ensuremath{\le}z\ensuremath{\le}1)$, carried out on single crystals by means of both macroscopic magnetometry and local probes of magnetism [muo…
A nonequilibrium molecular dynamics (NEMD) method using stochastic energy injection and removal as uniform heat sources and sinks is developed to calculate the thermal conductivity. The stochastic energy is generated by a Maxwell function generator and is imposed on only a few individual molecules each time step. The…
The mechanism of acetate-assisted transmetalation of tetrapyrroles was investigated in a model system consisting of chlorophyll a and copper(II) acetate in organic solvents by using a spectroscopic and kinetic approach. Surprisingly, acetate ions bind to the central Mg in chlorophyll much more strongly than do acetoni…
We investigate the second-order nonlinear optical properties of a push-pull chromophore in different external and supramolecular environments, through a combined experimental and theoretical approach. In particular, we compare the first hyperpolarizability (beta) of a model dipolar and polarizable chromophore with tha…
Brown lines were generated at the wet-dry interface on Whatman paper No. 1 by suspending the sheet vertically in deionized water. Formic acid and acetic acid were quantified in three areas of the paper defined by the wet-dry boundary (above, below, and at the tideline) using capillary zone electrophoresis with indirec…
Abstract We describe novel procedures which allow the facile production of monochiral single wall carbon nanotube suspensions using either density gradient centrifugation or selective dispersion with special organic polymers. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Abstract Aqueous solutions of carboxyl functionalized single‐wall carbon nanotube (SWCNT) films are deposited on silicon chips by the inkjet printing technique. By varying the film thickness it is possible to obtain low‐ or high density networks of SWCNTs, having either nonlinear or linear current‐voltage characterist…
We report on a facile method for the preparation of biocompatible and bioactive magnetic nanowires. The method consists of the direct deposition of polysaccharides by layer-by-layer (LbL) assembly onto a brush of metallic nanowires obtained by electrodeposition of the metal within the nanopores of an alumina template…