Materials Literature
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Rare-earth doped upconversion nanocrystals are emerging as the next-generation luminescent biomaterials. Here we load NaYF4: Yb/Er and NaYF4: Yb/Tm upconversion nanocrystals into a soft-glass suspended-core optical fiber dip sensor, allowing sensitive measurements and power-dependent characterizations to be performed.…
Structural-temporal theory for the analysis of the multi-scale nature of dynamic fracture based on the notion of a spatial-temporal fracture cell for different scale levels is presented. It was shown that incubation time based approach can be an effective instrument for both modeling principal dynamic fracture effects…
The magnetic properties and structural characterization of La0.7Ca0.3MnO3 nanoparticles (NPs) prepared by mechanical milling were investigated. By changing the milling time (tm) from 1 to 24 h, we obtained NPs with average crystallite sizes of 10–40 nm. The magnetic studies reveal that the Curie temperature (TC), magn…
Plasmonic nanostructures promise to provide sensing capabilities with the potential for sensitive and robust assays in a high parallelization. We present here the use of individual nanostructures for the detection and manipulation of biomolecules such as DNA based on optical approaches [1]. The change in localized sur…
From the lifetime measurement of ionic vacancy with a new type of electrode called cyclotron magnetohydrodynamic electrode (MHDE), two extinction processes of ionic vacancy were clarified; one is the decay to the initial state, and the other is the conversion to nanobubbles with the collision of the ionic vacancies. A…
New route for synthesize block copolymers containing poly(N-isopropylacrylamide) backbone and polyvinyl acetate or poly(N-vinyl-2-pyrrolidone) side chains is developed. The side-chain density and length can be adjusted with the benefit of using living radical polymerization method.
This study investigated several key mechanical and physical properties of oriented strand board (OSB) made from China fir strands impregnated with phenol-formaldehyde (PF) resin. Results showed that accumulated percentages of strand alignment angles between strand length direction and mechanical alignment direction on…
Previous Monte Carlo investigations of binary hard hyperspheres in four-dimensional mixtures are extended to higher densities where the systems may solidify. The ratios of the diameters of the hyperspheres examined were 0.4, 0.5, and 0.6. Only the 0.4 system shows a clear two phase, solid-liquid transition and the lar…
Femtosecond pump-probe spectroscopy is applied to identify transient optical signatures of phase transitions in nearly optimally doped YBa2Cu3O7−δ films. To elucidate the dynamics of superconducting and pseudogap phases, the slow thermal component is removed from the time-domain traces of photo-induced reflectivity in…
The over-expression of hyaluronidase has been linked to many types of cancer, and thus we present here a technique for hyaluronidase detection and quantification using Fluorescence Correlation Spectroscopy (FCS). Our probe consists of Hyaluronan macromolecules (HAs) heavily loaded with fluorescein dye to the extent th…
Based on the particle swarm optimization algorithm on crystal structural prediction, we first predict that TaN undergoes a phase transition from the experimental θ-TaN to a hexagonal P63/mmc structure at 87.5 GPa with volume drop of 1.6%. This hexagonal P63/mmc structure is isostructural with anti-NiAs and can be quen…
BACKGROUND: Linear polyethylenimine (LPEI) is considered as a desirable gene in vivo delivery system, but whether it could deliver the specific siRNA targeted EGFR to the tumor site to inhibit the growth of NSCLC xenograft in nude mice still needs to be examined. METHODS: In this study, LPEI/siRNA was made into a comp…
Laser-induced periodic surface structures, also known as ripples, have been investigated for a long time on various materials. They are self-organized grating-like structures that form spontaneously upon irradiation with a single laser beam; their formation requiring a high temperature rise, it generally results from…
We investigate the quantum confined Stark effect (QCSE) of various nanoparticles (NPs) on the single molecule level at room temperature. We tested 8 different NPs with different geometry, material composition and electronic structure, and measured their QCSE by single molecule spectroscopy. This study reveals that sup…
Spontaneously regulated in-plane polarity inversion ofa-oriented GaN domains has been demonstrated for the first time. Crystallographic analysis revealed that each domain grown on circular-hole-patternedr-plane sapphire substrates has basal faces with oppositely oriented in-plane polarity. The inverted orientation of…
Nitrogen dioxide is used as a "radical scavenger" to probe the position of carbon-centered radicals within complex radical ions in the gas phase. As with analogous neutral radical reactions, this addition results in formation of an [M + NO2](+) adduct, but the structural identity of this species remains ambiguous. Spe…
We analyze the properties of silicon integrated photonic lenses based on scattering optical elements. The devices have been inverse-designed by combining genetic algorithms and the multiple scattering theory. These lenses are able to focus an infrared plane wave front on a position freely determined during the design…
Ex situ spectroscopic ellipsometry (SE) measurements have been employed to investigate the effect of liquid-phase hydrofluoric acid (HF) cleaning on Si<100> surfaces for microelectromechanical systems application. The hydrogen terminated (H-terminated) Si surface was realized as an equivalent dielectric layer, and SE…
The effect of varying the percent crystallinity on the electrochemical behavior of Mg65Cu25Y10 and Mg70Zn25Ca5 bulk metallic glasses was studied. The alloys were heat-treated to achieve desired microstructures ranging from fully amorphous to fully crystalline, providing a systematic basis for subsequent testing. Poten…
Both technical and economic reasons suggest to join dissimilar metals, benefiting from the specific properties of each material in order to perform flexible design. Adhesive bonding and mechanical joining have been traditionally used although adhesives fail to be effective in high-temperature environments and mechanic…