Based on electron-beam direct writing on the SiOx/Si substrates, favorable absorption sites for ferric cations (Fe3+ ions) were created on the surface oxide layer. This allowed Fe3+-assisted self-assembled arrays of s...
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The microscopic features of binary mixtures formed by an ionic liquid (EMI+TFSA- or EMI+ FSA-) and a molecular liquid (acetonitrile or methanol) have been investigated by high-pressure infrared spectroscopy. On the ba...
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We have shown that any pair potential function v(r) possessing a Fourier transform V(k) that is positive and has compact support at some finite wave number K yields classical disordered ground states for a broad densi...
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We have shown that any pair potential function v(r) possessing a Fourier transform V(k) that is positive and has compact support at some finite wave number K yields classical disordered ground states for a broad density range [R. D. Batten, F. H. Stillinger, and S. Torquato, J. Appl. Phys. 104, 033504 (2008)]. By tuning a constraint parameter χ (defined in the text), the ground states can traverse varying degrees of local order from fully disordered to crystalline ground states. Here, we show that in two dimensions, the “k-space overlap potential,” where V(k) is proportional to the intersection area between two disks of diameter K whose centers are separated by k, yields anomalous low-temperature behavior, which we attribute to the topography of the underlying energy landscape. At T=0, for the range of densities considered, we show that there is continuous energy degeneracy among Bravais-lattice configurations. The shear elastic constant of ground-state Bravais-lattice configurations vanishes. In the harmonic regime, a significant fraction of the normal modes for both amorphous and Bravais-lattice ground states have vanishing frequencies, indicating the lack of an internal restoring force. Using molecular-dynamics simulations, we observe negative thermal-expansion behavior at low temperatures, where upon heating at constant pressure, the system goes through a density maximum. For all temperatures, isothermal compression reduces the local structure of the system unlike typical single-component systems.
It has not been investigated adequately whether a quantum-mechanical nature can persist in a classical magnetic long-range order in systems with large spins. The recent experimental study reports a quantum-mechanical ...
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It has not been investigated adequately whether a quantum-mechanical nature can persist in a classical magnetic long-range order in systems with large spins. The recent experimental study reports a quantum-mechanical 1/3 magnetization plateau at greater than 2 T and a classical canted antiferromagnetic long-range order in weak magnetic fields in SrMn3P4O14 possessing spin 5/2 [Yang et al., Inorg. Chem. 47, 2562 (2008)]. The origins of the plateau are quantum-mechanical discrete energy levels of magnetic eigenstates. Although the spin system of SrMn3P4O14 is inferred to be a trimerized spin chain, the magnetism has not been explained quantitatively. We have conducted high-field magnetization measurements of SrMn3P4O14 powders and determined that the spin system is a spin-5/2 trimer with weak three-dimensional intertrimer interactions. This spin system can account for the magnetization plateau and magnetic long-range order.
The use of near-infrared plasmon resonance of gold nanorods (NR) to offer an integrated platform for multiplexed Raman detection and remote-controlled photothermal heating is analyzed. Surface enhanced Raman scatterin...
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The use of near-infrared plasmon resonance of gold nanorods (NR) to offer an integrated platform for multiplexed Raman detection and remote-controlled photothermal heating is analyzed. Surface enhanced Raman scattering (SERS)-coded NRs were efficiently detected following subcutaneous or intratumoral injection and enabled remote photothermal tumor heating to ablative temperatures. Cetyltrimethylammonium bromide (CTAB)-coated gold NRs were bought from Nanopartz with a peak plasmon resonance at 790 nm. NRs were purified further with multiple rounds of centrifugation using molecular weight cutoff centrifugal filters and stored at 200 pm at 4C. The SERS intensities of NRs coated with different dyes were compared using ethanol as an internal standard. The best NRs were selected by comparing the peak height ratio of the dye's most intense SERS peak to the peak height of the ethanol vibration at 879 cm-1 used as an internal standard.
Die direkte Proteinfunktionalisierung ergibt synthetische antiferromagnetische Nanopartikel mit hoher chemischer Spezifität und vielfältigen Funktionen. Diese Nanopartikel‐Protein‐Konjugate wirken als verb...
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Die direkte Proteinfunktionalisierung ergibt synthetische antiferromagnetische Nanopartikel mit hoher chemischer Spezifität und vielfältigen Funktionen. Diese Nanopartikel‐Protein‐Konjugate wirken als verbesserte magnetische Markierungen für biologische Analysen und reagieren in einstellbarer Weise auf kleine äußere Magnetfeldgradienten, sodass sich die Bewegung einzelner Nanopartikel verfolgen lässt.
The use of Pd coatings on multiple InN nanobelts is shown to enhance their sensitivity for hydrogen sensing at hundreds of ppm level at 25°C . Without the metal coating to catalyze dissociation of the hydrogen mo...
The use of Pd coatings on multiple InN nanobelts is shown to enhance their sensitivity for hydrogen sensing at hundreds of ppm level at 25°C . Without the metal coating to catalyze dissociation of the hydrogen molecules, the InN nanobelts with Ohmic contacts at either end showed no detectable change in current when exposed to hydrogen under the same conditions. Moreover, the Pd-coated InN showed no response to CO2 , C2H6 , NH3 , and O2 (all in N2 ambient). The relative resistance change in the Pd-coated sensors was not linearly dependent on the hydrogen concentration at dilute levels, i.e., 8% at 100ppm H2 and 9.5% at 1000ppm H2 . The recovery characteristics of the sensors at room temperature after hydrogen sensing were also examined and ∼50% of the initial InN resistance was recovered 10min after sensor exposure to air. At higher temperatures, larger resistance changes and faster response and recovery were obtained. Pd-coated InN nanobelt sensors displayed much higher relative response than Pt-coated sensors.
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