Materials Literature
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Experiments investigating the local viscoelastic properties of a simple uncross-linked flexible polymer are performed on polyethylene oxide solutions in the semidilute regime using polystyrene beads of varying sizes and surface chemistry as probes. We measure the thermal motions of the beads to obtain the elastic and…
We have fabricated single-wall carbon nanotube field-effect transistors (CNFETs) in a conventional metal–oxide–semiconductor field-effect transistor (MOSFET) structure, with gate electrodes above the conduction channel separated from the channel by a thin dielectric. These top gate devices exhibit excellent electrical…
We compute the nonlinear optical response of an Fe monolayer placed on top of 1 to 4 monolayers of Cu(001). Our calculation is based on ab initio eigenstates of the slab, which are obtained within the full-potential linearized augmented plane-wave method. The ground-state spin-polarized electronic structure is converg…
The steering effect on the growth of islands is investigated by combining molecular dynamics (MD) and kinetic Monte Carlo (KMC) simulations. Dynamics of depositing atoms and kinetics of atoms on a substrate are realized by MD and KMC, respectively. The reported experimental results on the asymmetric island growth [van…
Some models of clustering processes are formulated and analytically solved employing generating functions methods. Those models include events which result from combined action of the coagulation and fragmentation processes. Fragmentation processes of two kinds, so-called similar and arbitrary, ones, are brought forwa…
Exact and general results on the electronic states in ideal free standing films are presented. In many interesting cases, such as in FCC (001) films and in FCC (110) films, the energies of most electronic states in the film can be analytically obained from the corresponding energy band structure of the bulk. This appr…
We have synthesized a series of fluorinated side chain block copolymers based on either a hydroborated polystyrene- b -polyisoprene or a poly(methyl methacrylate)- b -poly(2-hydroxyethyl methacrylate) backbone. Through polymer-analogous reactions, perfluorinated ester, fluorinated urethane, and fluorinated carbonate s…
This report outlines a new and efficient synthesis of cyclen (1,4,7,10-tetraazacyclododecane, 1) utilizing bis-imidazoline, 6 (1,1'-ethylenedi-2-imidazoline), with 1,2-dibromoethane. General conditions were developed, allowing for the simple, three-step synthesis of 1 at the multigram scale with an isolated overall yi…
Colemanite is one of the most important underground riches of Turkey, having approximately 60% of the world boron deposits, and it has a large portion in the deposits. When colemanite having a 2CaO·3B 2 O 3 ·5H 2 O formula is mined naturally, it contains various clay minerals. During boric acid production by a sulfuri…
This paper reports on the orientational behavior of thermotropic liquid crystals supported on films of biotinylated bovine serum albumin (BSA) that are covalently immobilized on the surface of glass substrates using (3-aminopropyl)triethoxysilane (APES) and disuccinimidyl suberate (DSS). The films of biotinylated BSA…
The reaction of LnI(3) x xMeCN (Ln = Gd, Dy) and TCNE (tetracyanoethylene) in acetonitrile forms Ln(2)[C(4)(CN)(8)](3) x xMeCN. These paramagnetic light-colored solids contain the S = 0 octacyanobutandiide dianion, [C(4)(CN)(8)](2-), which upon desolvation of these products forms dark green Ln(TCNE)(3). In these compo…
While aromatic polyimides have found widespread use as high-performance polymers, the present work addressed the need for organosoluble pre-imidized materials through the use of a hyperbranching scheme. The AB 2 monomer, N -[3,5-bis(4-hydroxybenzoyl)benzene]-4-fluorophthalimide, was prepared from 4-fluoroisophthalic a…
The adsorption of l -cysteine ( l -Cys) onto a polycrystalline silver electrode surface was investigated by in situ spectroelectrochemical methods. Surface-enhanced Raman spectroscopy (SERS) and surface-enhanced second-harmonic generation (SESHG) measurements were performed in a 0.2 M KCl solution in the presence and…
A tethered triblock copolymer has been synthesized by sequential monomer addition to a self-assembled monolayer of (11-(2-bromo-2-methyl)propionyloxy)undecyltrichlorosilane. Si/SiO 2 //polystyrene- b -poly(methyl acrylate)- b -polystyrene (PS- b -PMA- b -PS) and Si/SiO 2 //PMA- b -PS- b -PMA were prepared by the “graf…
Multiwalled as well as single-walled carbon nanotubes are conveniently prepared by the pyrolysis of organometallic precursors such as metallocenes and phthalocyanines in a reducing atmosphere. More importantly, pyrolysis of organometallics alone or in mixture with hydrocarbons yields aligned nanotube bundles with usef…
An asymmetric double cantilever beam (ADCB) was utilized to determine the ability of a series of styrene and methyl methacrylate copolymers with varying architectures to compatibilize the polystyrene/poly(methyl methacrylate) interface. Diblock, triblock, pentablock, and heptablock multiblock copolymers with similar m…
Starting from a multipole expansion of intra- molecular Coulomb interactions, we present configuration interaction calculations of the molecular energy terms of the hole configurations hu^m, m=2-5, of C60^{m+} cations, of the electron configurations t1u^n, n=2-4, of the C60^{n-} anions, and of the exciton configuratio…
The path probability method (PPM) in the tetrahedron-cactus approximation is applied to the Slater-Takagi model with dipole-dipole interaction for KH2PO4-type hydrogen-bonded ferroelectric crystals in order to derive a small dip structure in the real part of dynamical susceptibility observed at the transition temperat…
We examine the alignment of thin film diblock copolymers subject to a perpendicular electric field. Two regimes are considered separately: weak segregation and strong segregation. For weakly segregated blocks and below a critical value of the field, E c, surface interactions stabilize stacking of lamellae in a directi…
The effect of the addition of CeO 2 on the structural and textural properties of TiO 2 and TiO 2 −CuO samples calcined at different temperatures was analyzed. The structural and textural transformation when the temperature of calcination was varied was followed by X-ray diffraction, Raman spectroscopy, and N 2 adsorpt…