Materials Literature
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Treatments of Mn(O(2)CR)(2) (R = Me, Ph) with NBu(4)MnO(4) in CH(3)CN or CH(3)CN/CH(2)Cl(2) in the presence of acetic acid, delta(1)-cyclohexenephosphonic acid (C(6)H(9)PO(3)H(2)), and 2,2'-bipyridine or 1,10-phenanthroline result in three novel dodecamanganese(III) clusters [Mn(12)O(8)(O(2)CMe)(6)(O(3)PC(6)H(9))(7)(b…
We report the preparation and characterization of poly(N-isopropylacrylamide) (PNIPAAm) polymer brushes exhibiting controlled lateral variations in the patchiness of polymer chains. These gradients were achieved through an atom transfer radical polymerization (ATRP) grafting-from approach utilizing surfaces on which t…
A method that combines co-evaporation of pure elements from multiple finite-size sources on temperature-controlled substrates with independently controlled source shutters has been used for the synthesis of solid-state material combinatorial libraries. The source shutters are positioned to achieve a controlled gradien…
Hollow silica spheres with mesostructured shells (HSSMS) were prepared with a vesicle template of cetyltrimethylammonium bromide-sodium dodecyl sulfate-Pluronic P123 (C(16)TMAB-SDS-EO(20)PO(70)EO(20)) at a SDS/C(16)TMAB ratio of 0.6-0.8 following a fast silicification in dilute silicate solution at pH approximately 5.…
We have analyzed the interaction of a dissipative two level quantum system with high and low frequency excitation. The system is continuously and simultaneously irradiated by these two waves. If the frequency of the first signal is close to the level separation the response of the system exhibits undamped low frequenc…
We study the role played by the magnetic frustration in the antiferromagnetic phase of the organic salt κ - (BEDT–TTF) 2 Cu[N(CN) 2 ]Cl. Using the spatially anisotropic triangular Heisenberg model we analyse previous and newly performed NMR experiments. We compute the 1/ T 1 relaxation time by means of the modified sp…
In this letter, Monte Carlo simulation methods were used to investigate the influence of the defect orientation and concentration on the hysteresis loop in ferroelectric thin films. The hysteresis loops were calculated by an existing Monte Carlo model. For a certain type of defect orientation, the simulations revealed…
In this paper we consider buoyancy-driven flow and directional solidification of a ternary alloy in two dimensions. A steady flow can be established by forcing liquid downward at an average rate V through a temperature gradient that is fixed in the laboratory frame of reference and spans both the eutectic and liquidus…
The dielectric functions of a series of periodic mesoporous silica as well as periodic mesoporous organosilica thin films were measured using generalized variable angle spectroscopic ellipsometry over the spectral range 300–1400nm. Ellipsometry results indicate that following template removal, both types of films poss…
Changes in the peptide chain of amphiphilic heptapeptides known to form ion-conducting pores in bilayers dramatically alter transport efficacy and the aggregation number of pore formation.
Visualization of residue positions in protein alignments and mapping onto suitable structural models is an important first step in the interpretation of mutations or polymorphisms in terms of protein function, interaction, and thermodynamic stability. Selecting and highlighting large numbers of residue positions in a…
Magnetic properties of the hexagonal compounds of YMn 1+ x O 3 (0≤ x ≤0.15) have been studied by measuring the dc magnetization, ac magnetization, magnetic hysteresis, and relaxation of the magnetization. All the results give evidence of a spin glass (SG) state at low temperatures in samples with x ≥0.08. This is attr…
We report on the magnetic, magnetotransport and structural characterization of (Ca1?yNdy)2Fe1+xMo1?xO6 (x 0) of Fe ions in the metallic sublattice produces a remarkable increase, by more than 90?K, of the Curie temperature. M?ssbauer spectroscopy data indicate a reinforcement of the magnetic interactions. We argue tha…
Powders consisting of 44 Å Cd 1− x Mn x S ( x = 0; 0.05; 0.1; 0.15; 0.3) quantum dots (QDs) were synthesized using the colloidal chemistry method and characterized by Raman scattering measurements. The dominant Raman line of the 44 Å Cd 1− x Mn x S QDs was at about 300 cm −1 showing asymmetric broadening for ω < 300 c…
In this paper, small-angle x-ray scattering measurements are used to determine the different compressibility contributions, as well as the isothermal compressibility ${\ensuremath{\chi}}_{T}^{0}$ in thermal equilibrium in silica glasses having different thermal histories. Using two different methods of analysis, in th…
The potential barrier at the apex of a single-wall carbon nanotube emitter is found to be strongly and nonlinearly dependent on the external applied field, due to a quantum mechanical mechanism instead of the correction of image potential in Fowler-Nordheim theory. The field enhancement factor depends on the applied f…
Perovskite-type gold complex ${\mathrm{Cs}}_{2}{\mathrm{Au}}_{2}{\mathrm{Br}}_{6}$ is known to show a photoinduced valence transition as well as a pressure-induced valence transition from the mixed-valence ${\mathrm{Au}}^{+}$ and ${\mathrm{Au}}^{3+}$ state to the single-valence ${\mathrm{Au}}^{2+}$ state under high pr…
Three fundamentally different failure theories for homogeneous and isotropic materials are examined in both the ductile and brittle ranges of behavior. All three theories are calibrated by just two independent failure properties. These three are the Coulomb-Mohr form, the Drucker-Prager form, and a recently derived th…
Hot air in a hurry: An industrial Fe-Mo-O catalyst, used in the production of formaldehyde has been studied under redox conditions using rapid in situ powder diffraction studies (see contour image). Surprisingly, the oxidation step is fastest as it is completed within 15 s at 472 °C.
The famous five: The elusive five-coordinate nitrito complexes [FeIII(por)(ONO)] (por=meso-tetraphenylporphyrinato dianion or meso-tetra-p-tolylporphyrinato dianion) have been obtained by interaction of low-pressure NO2 with sublimed layers of [FeII(por)]. Spectral data confirm that the NO2− ligand prefers to bind thr…