Materials Literature
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This report describes the fabrication and electroless plating of regular porous and pincushion-like polymer structures prepared by self-organization. Honeycomb-patterned films were prepared by simple casting of polymer solution under applied humid air and pincushion structures by peeling off the top layer of the forme…
We describe the design, construction, calibration, and operation of a relatively simple differential capacitive dilatometer suitable for measurements of thermal expansion and magnetostriction from 300 K to below 1 K with a low-temperature resolution of about 0.05 angstroms. The design is characterized by an open archi…
A first principles density functional based linear response theory (the so called Density Functional Perturbation theory \cite{dfpt}) has been combined separately with two recently developed formalism for a systematic study of the lattice dynamics in disordered binary alloys. The two formalisms are the Augmented space…
The currently available microwave technology permits the development and implementation of a temperature-programmed microwave-assisted synthesis (TPMS) of ordered mesoporous silicas (OMSs). Unlike in previously reported syntheses of OMSs, in which only the final hydrothermal treatment was carried out under microwave i…
The effect of anchoring group on the electrical conductance of a single molecule bridging two Au electrodes was studied using di-substituted (isocyanide (CN-), thiol (S-) or cyanide (NC-)) benzene. The conductance of a single Au/1,4-diisocyanobenzene/Au junction anchored by isocyanide via a C atom (junction with the A…
Within the t-J model we study several experimentally accessible properties of the 2D-triangular lattice system Na$_x$CoO$_2$, using a numerically exact canonical ensemble study of 12 to 18 site triangular toroidal clusters as well as the icosahedron. Focusing on the doping regime of $x\sim0.7$, we study the temperatur…
A self-consistent treatment of the spin-Hall effect requires consideration of the spin-orbit coupling and electron-impurity scattering on equal footing. This is done here for the experimentally relevant case of a [110] GaAs quantum well [Sih {\it et al.}, Nature Physics 1, 31 (2005)]. Working within the framework of t…
Nanotechnology encompasses an increasingly sophisticated ability to manipulate matter at the nanoscale, resulting in new materials, products and devices that demonstrate new and unusual behaviour. While emerging nanotechnologies have great potential for good, there are increasing concerns that the selfsame attributes…
Abstract This study describes the preparation of polyethersulfone (PES)/layered silicate nanocomposites (PLSNs) by mixing PES polymer chain into organically‐modified layered silicate in 1‐methyl‐2‐pyrrolidinone (NMP) solution. Both X‐ray diffraction data and transmission electron microscopy images of PLSNs indicate th…
We present experimental and theoretical results for the variation of the O $1s$ intensity from a NiO(001) surface as the excitation energy is varied through the Ni $2{p}_{1∕2,3∕2}$ absorption resonances, and as the incidence angle of the radiation is varied from grazing to larger values. For grazing incidence, a stron…
Two newly synthesized pyrenylcyclam dendrons (1 and 2) exhibit a new emission band centered at 450 nm when coordinated with copper triflate. Observed fluorescence shifts induced by coordinative metalation indicate an unusual intramolecular charge transfer from a pyrenyl excited state to the coordinated metal ion that…
We report on blue luminescence from alumina nanoparticles suspended in toluene solution. They were fabricated through ultrasonic treatment of porous anodic alumina membrane. The photoluminescence in the suspension of alumina nanoparticles shows considerable blueshift as larger particles precipitate. Transmission elect…
Präzises Replikat: Mikrostrukturierte Polymethacrylsäure(PMAA)-Bürsten wurden als ionotrope Matrices zur Herstellung mikrostrukturierter dünner Calcit-Filme eingesetzt. Die Calcitfilme sind ein exaktes dreidimensionales Replikat der Matrix aus PMAA-Bürsten (siehe Schema; ACC = amorphe CaCO3-Phase).
A new AB 2 monomer, 2,3-bis(3-amino-4-hydroxyphenyl)quinoxaline-6-carboxylic acid dihydrochloride, was synthesized in four steps starting from the double condensation of commercially available 3,4-diaminobenzoic acid and 4,4‘-dimethoxybenzil. It underwent facile polycondensation in polyphosphoric acid to afford the co…
Abstract The synthesis, X‐ray crystal structure and magnetic properties of two oxalato‐bridged dinuclear Cu II complexes, [L‐Cu(μ‐ox)Cu‐L](ClO 4 ) 2 , where ox = oxalate and L = 1,4,7‐trimethyl‐1,4,7‐triazacyclononane (Me 3 tacn) or 1‐benzyl‐4,7‐dimethyl‐1,4,7‐triazacyclononane (BzMe 2 tacn) are reported, as well as t…
Crystalline vanadium pentoxide with hierarchical mesopores was synthesized by using a CTAB/BMIC cotemplate (CTAB = cetyltrimethylammonium bromide, BMIC = 1-butyl-3-methylimidazolium chloride). The material was fully characterized by SEM, TEM, N2 adsorption-desorption, XRD, XPS, and CV methods. By elaborate adjustment…
Abstract The crystallization, melting behavior, and morphology of Polypropylene (PP) and PP/Novolac blends were studied by scanning electron microscopy, wide angle X‐ray diffraction, differential scanning calorimetry, and polarized optical microscope. The results showed that the crystallization of PP in PP/Novolac ble…
Towards the prediction of thermodynamic properties for complex systems and the design of self-assembly techniques for the production of nanocomposite materials, we employ Monte Carlo simulations to calculate the effective interactions between colloidal brushes dissolved in nonadsorbing polymer solutions. For simplicit…
Different chemical reaction models (first-order, second-order, and n th-order) and six different model-fitting techniques ( n th-order, Friedman, Freeman−Carroll, Chang, ASTM E689, and the standard deviation minimization technique (SDMT)) are used to evaluate the kinetics triplet ( E, ln k 0, and n ) for the thermal d…
Abstract The low vapor pressure solvent 1‐chloropentane was used to directly spincast polystyrene (PS) films onto poly(methyl methacrylate) (PMMA) with smooth surfaces and sharp interfaces. Interface roughness after removal of the PS layer with cyclohexane was determined with scanning force microscopy to be <1 nm.…