Materials Literature
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Halloysite is naturally available clay mineral with hollow cylindrical geometry and it is available in thousands of tons. Silver nanorods were synthesized inside the lumen of the halloysite by thermal decomposition of the silver acetate, which was loaded into halloysite from an aqueous solution by vacuum cycling. Imag…
Abstract The efficient coupling between lattice degrees of freedom and spin degrees of freedom in magnetic materials can be used for refrigeration and energy conversion. This coupling is enhanced in materials exhibiting the giant magnetocaloric effect. First principle electronic structure calculations on hexagonal MnF…
Lanthanide-doped upconversion nanoparticles (UCNPs) are considered promising novel near-infrared (NIR) bioimaging agents with the characteristics of high contrast and high penetration depth. However, the interactions between charged UCNPs and mammalian cells have not been thoroughly studied, and the corresponding intr…
Low-temperature (∼450 °C), scalable chemical vapor deposition of predominantly monolayer (74%) graphene films with an average D/G peak ratio of 0.24 and domain sizes in excess of 220 μm(2) is demonstrated via the design of alloy catalysts. The admixture of Au to polycrystalline Ni allows a controlled decrease in graph…
Thermoelectric heat-to-power generation is an attractive option for robust and environmentally friendly renewable energy production. Historically, the performance of thermoelectric materials has been limited by low efficiencies, related to the thermoelectric figure-of-merit ZT. Nanostructuring thermoelectric materials…
We study solar-cell designs using nano-grating on both top (transmission) and bottom (reflection) of the solar cell. First, we perform simulations based on rigorous coupled wave analysis (RCWA) to evaluate the diffraction top gratins. In RCWA method, we calculate up to 20 harmonics, and sweep the launch angle of incid…
采用传统的固相合成法制备了Eu 3+ 掺杂的Bi 4 Si 3 O 12 发光材料. 使用X射线粉末衍射技术对制备的发光粉体进行了表征. Eu 3+ 掺杂的Bi 4 Si 3 O 12 材料的激发谱表明, 在265 nm处强而宽的谱带对应于Eu 3+ → O 2- 之间的电荷转移跃迁带. 在用紫外光激发的荧光光谱中, Eu 3+ 掺杂的Bi 4 Si 3 O 12 材料在614 nm处有强的红光发射. 材料的激发和发射光谱结果表明, Eu3+掺杂的Bi 4 Si 3 O 12 有望做为红色固体发光的候选材料.
High‐strength dual phase steels readily exhibit bad galvanizability and coating defects because of selective oxides formed on steel surface during the annealing process prior to galvanizing. To investigate selective oxidation of alloying elements and their effects on glavanizability, a high‐strength dual phase steel w…
We investigate the dynamical behavior of finite rings of classical spin vectors interacting via nearest-neighbor isotropic exchange in an external magnetic field. Our approach is to utilize the solutions of a continuum version of the discrete spin equations of motion (EOM) which we derive by assuming continuous modula…
Using high resolution inelastic x-ray scattering we studied the collective dynamics of the Pd(77)Si(16.5)Cu(6.5) metallic glass, focusing on the energy-momentum region where the boson peak appears. The dispersion relation and the width of the acoustic excitations are determined showing how the longitudinal acoustic mo…
The tunneling density of states of both the massless and massive (gapped) particles in metallic carbon nanotubes is known to have an anomalous energy dependence. This is the result of coupling to multiple low-energy bosonic excitation (plasmons). For both kinds of particles the ensuing effect is the suppression of the…
Liquid, injectable hydrophobic polymers are potentially useful as depot systems for localized drug delivery. Low molecular weight polymers of 5-ethylene ketal ε-caprolactone and copolymers of this monomer with D,L-lactide were prepared and their properties assessed with respect to their suitability for this purpose. T…
Novel PS composites with improved combustion properties were prepared by using OctaTMA-POSS and OctaTMA-POSS-based lamellar hybrids. The lamellar hybrids were prepared via template-directed synthesis from OctaTMA-POSS and surfactants. The microstructures of composites were characterized by TEM, which showed that POSS-…
The La0.65Sr0.35MnO3 (LSM)/SrTi0.2Fe0.8O3 (STF) multilayer is observed using scanning probe microscopy following a focused-ion beam milling process with shallow incidence angle. Although the nominal thickness of each layer is about 5 nm, the exposed layers are magnified by several orders of magnitude on the surface af…
The physicomechanical properties of new polyurethanes (PUs) derived from toluene diisocyanate, poly(propylene glycol), and cured by third‐generation hyperbranched polyester polyol (HB3), trimethylolpropane (TMP), or glycerol and their nanocomposites have been investigated. An apparent microphase‐segregated morphology…
This investigation systematically studies the lattice dynamics and crystalline properties in Zn 1– x Mg x O using high-pressure Raman spectroscopy. The incorporation of Mg and the application of external pressure cause distinct phonon vibrational behaviors in ZnO. Accordingly, the 202.7, 332.7, and 511.5 cm –1 phonons…
Abstract Novel materials and methods of synthesis in the field of energy conversion and economy are reported. The main goal is to prepare and characterize Li (4 − x ) Mn (5 − 2 x ) Fe 3 x O 12 compounds. These compounds crystallize in a spinel‐type structure, AB 2 O 4 , in which the cationic location in the A and B su…
We synthesized new amphiphiles comprised of a single diacetylenic chain and an oligoethylenoxide polar chain linked by an amide bond. In aqueous medium, they are not soluble at room temperature but form weak gels. Electron microscopy studies have shown that they self-assemble into helical tapes or nanotubes with lengt…
In the companion paper [T. S. Ingebrigtsen, S. Toxvaerd, O. J. Heilmann, T. B. Schrøder, and J. C. Dyre, "NVU dynamics. I. Geodesic motion on the constant-potential-energy hypersurface," J. Chem. Phys. (in press)] an algorithm was developed for tracing out a geodesic curve on the constant-potential-energy hypersurface…
Using ab initio density-functional theory, we study the role of interstitial hydrogen on the energetics of the phase transformation of iron from bcc to hcp along Bain's pathway. The impurity creates an internal stress field that can be released through a tetragonal distortion of the lattice, promoting the bcc (ferroma…