Materials Literature
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The surface modification of cellulose fibers with 3,3,3-trifluoropropanoyl chloride (TFP) was studied in a toluene suspension. The characterization of the modified fibers was performed by elemental analysis, Fourier transform infrared (FTIR), 13C-solid-state NMR, X-ray diffraction, thermogravimetry, and surface analys…
Low-energy transport measurements in quantum Hall systems have been argued to be governed by emergent modular symmetries whose predictions are robust against many of the detailed microscopic dynamics. We propose the recently observed quantum Hall effect in graphene as a test of these ideas, and identify to this end a…
We report the combination of top-down and bottom-up nanomanufacturing techniques to fabricate active, hierarchically structured volume reflection gratings. Holographic polymerization (H-P) formed lamellar structures of approximately 200 nm in thickness, confining a block copolymer (BCP) to approximately 100 nm domains…
Arrays of transparent dielectric nanorods are shown to produce very large local field enhancements at specific resonant conditions. These structures would lead to enhancement of molecular fluorescence signals without quenching. The resonant angular width and field enhancements are analytically derived as a function of…
We consider three-dimensional structures consisting of multiple interlocking, disconnected metal networks. We show that, in the low-frequency limit, these systems support photonic bands with linear dispersion relation. The number of such photonic bands is directly controlled by the number of networks and can be arbitr…
A new Brownian dynamics model is presented to describe the coarse grain dynamics of particles with long-lived memory. Instead of solving a set of generalized Langevin equations we introduce a set of variables describing the slowly fluctuating thermodynamic state of the ignored degrees of freedom. These variables give…
Abstract A new heterocyclic system, namely [1,2,5]selenadiazolo[3,4‐ c ][1,2,5]thiadiazole ( 1 ), has been prepared in 60 % yield by the 1:1 condensation of 3,4‐diamino‐1,2,5‐thiadiazole ( 4 ) with SeCl 4 in the presence of pyridine. The structures of 1 and its 1:1 complex with pyridinium chloride ( 5 ) have been eluc…
Single-phased powder BiCrO(3) sample was prepared at 6 GPa and 1653 K. Its magnetic properties were investigated by dc/ac magnetization, magnetic relaxation, and specific heat measurements. Four anomalies of magnetic origin were found near 40, 75, 109, and 111 K. The long-range antiferromagnetic order with weak ferrom…
Abstract Polyimide/diamond nanocomposites have been synthesized from 4,4′‐diaminodiphenyl ether (ODA) and 3,3′,4,4′‐benzophenonetetracarboxylic dianhydride (BTDA). All the polyimides show non‐crystalline X‐ray diffraction. The frequent occurrence of particular interatomic distances ( R ) denoted by the non‐crystalline…
Luminescence from single isoelectronic traps in nitrogen δ-doped gallium phosphide was studied by micro-photoluminescence spectroscopy. These single traps were found to emit photons that were nearly identical in both emission energy and brightness. Furthermore, single photon emission from a single nitrogen pair is con…
Abstract The photo‐ and thermochromic behaviour of a series of spiro[indolinepyridobenzopyrans] 1–5 has been studied. The thermodynamic and kinetic parameters of the thermal equilibria between the ring‐closed and ring‐opened (merocyanine) isomeric forms of spiropyrans have been determined using UV–Vis absorption and 1…
Size dependent stabilities, fragmentation pathways and dissociation energies of a series of gas phase cationic doped gold clusters, Au(n)X+ (3 < or = n < or = 20; X = Y, Er and Nb), and pure Au(n)+ clusters were investigated in photofragmentation experiments. Size dependent stability patterns were obtained and the bra…
The authors report the transmission properties of omega shaped metallic inclusions on a dielectric medium that exhibits bianisotropic properties. The resonance frequencies of single omega resonators are investigated experimentally and numerically. The resonance frequency of an Ω structure depends on its orientation wi…
Platinum nanocrystals of about 30−100 nm size were grown on SrTiO 3 substrates in different orientations. Their shapes were investigated using first-principles methods and compared to scanning electron microscope images. Analysis of the results for several different surface orientations shows epitaxial growths, unifor…
Redox-active polyelectrolyte−surfactant complexes (PSC) were prepared via the ionic self-assembly of sodium poly(styrenesulfonate) (PSS) and ferrocenyl surfactant, n -alkyl (ferrocenylmethyl)ammonium bromide (Fc n, n = 8, 12, 16, where n is the carbon number of the alkyl chain), in solution. The PSS−Fc n complex exhib…
We fabricated a cholesteric-liquid-crystal distributed-feedback laser cell with spatial gradient structures not only of the helical pitch but also of the concentrations of two dyes. By utilizing the energy transfer between two dyes, lasing was achieved covering a full visible range from 470 to 670 nm continuously by t…
Various ZnO nanostructures, such as nanobelts, nanorods, and nanowires, have been grown on presynthesized SnO 2 nanobelts via a simple thermal evaporation of Zn powders, without using any catalysts, producing various heterostructures. The evaporation temperature is the critical experimental parameter for the formation…
A key question in nanomechanics concerns the grain size effects on materials' strength. Correct solution to this question is critical to design and tailor the properties of materials for particular applications. The full map of grain sizes-hardness/yield stress relationship in metals has been built. However, for ceram…
The effective interaction parameters, (χ F ) of the homologous series of deuterated polystyrene- block -poly( n -alkyl methacrylate) copolymers (dPS- b -PA n MA) from methyl ( n = 1) to hexyl ( n = 6) side groups have been investigated by small-angle neutron scattering and a Hartree (fluctuation correction) analysis.…
The direct mix of aqueous ferric chloride and o-phenylenediamine (OPD) solutions at room temperature has been demonstrated for the first time to be an effective, economic, and fast method for preparing microfibrils on a large scale. The formation of such large microfibrils is attributed to the self-assembly of the OPD…