Materials Literature
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We report on a numerical study of the shear flow of a simple two-dimensional model of a granular material under controlled normal stress between two parallel smooth, frictional walls, moving with opposite velocities $\pm$V . Discrete simulations, which are carried out with the contact dynamics method in dense assembli…
We report on the synthesis of carbon nanotubes on quasicrystalline alloys. Aligned multiwalled carbon nanotubes (MWNTs) on the conducting faces of decagonal quasicrystals were synthesized using floating catalyst chemical vapor deposition. The alignment of the nanotubes was found perpendicular to the decagonal faces of…
Quasicrystals are metallic alloys that possess long-range, aperiodic structures with diffraction symmetries forbidden to conventional crystals. Since the discovery of quasicrystals by Schechtman et al. at 1984 (ref. 1), there has been considerable progress in resolving their geometric structure. For example, it is wel…
We present the use of planar waveguides to produce neutron microbeams in order to investigate magnetic micro-structures with a micrometric spatial resolution. We report experimental results on such measurements on a polarized neutron reflectometer using a nonmagnetic waveguide structure to probe an amorphous magnetic…
Oxygen vacancies are increasingly recognized to play a role in phenomena observed at transition-metal oxide interfaces. Here, we report a study of SrRuO${}_{3}$ and La${}_{0.7}$Sr${}_{0.3}$MnO${}_{3}$ interfaces using a combination of quantitative aberration-corrected scanning transmission electron microscopy, electro…
Cool white dwarfs with Teff < 6000 K are the remnants of the oldest stars that existed in our Galaxy. Their atmospheres, when properly characterized, can provide valuable information on white dwarf evolution and ultimately star formation through the history of the Milky Way. Understanding the atmospheres of these star…
Carbon nanotubes (CNTs) are an order of magnitude stronger than any other current engineering fiber. However, for the past two decades, it has been a challenge to utilize their reinforcement potential in composites. Here, we report CNT composites with unprecedented multifunctionalities, including record high strength…
Understanding the complexities associated with contact line dynamics on chemically heterogeneous and superhydrophobic surfaces is important for a wide variety of engineering problems. Despite significant efforts to capture the behavior of a droplet on these surfaces over the past few decades, modeling of the complex d…
The synthesis of silicene, graphene-like silicon, has generated very strong interest. Here, we reveal the growth of high aspect ratio, perfectly straight, and aligned silicon nanoribbons, exhibiting pyramidal cross section. They are multistacks of silicene and show in angle-resolved photoemission cone-like dispersion…
Oriented attachment, the process in which nanometer-sized crystals fuse by atomic bonding of specific crystal facets, is expected to be more difficult to control than nanocrystal self-assembly that is driven by entropic factors or weak van der Waals attractions. Here, we present a study of oriented attachment of PbSe…
Carborane-based host materials were prepared to fabricate deep blue phosphorescence organic light-emitting diodes (PHOLEDs), which constituted three distinctive geometrical structures stemming from the corresponding three different isomeric forms of carboranes, namely, ortho-, meta-, and para-carboranes. These materia…
The rapid development of nanotechnology will inevitably release nanoparticles (NPs) into the environment with unidentified consequences. In addition, the potential toxicity of CeO(2) NPs to plants and the possible transfer into the food chain are still unknown. Corn plants (Zea mays) were germinated and grown in soil…
Here we report a new strategy to improve the electrochemical stability of vanadium oxide electrodes for pseudocapacitors. Vanadium oxides are known to suffer from severe capacitance loss during charging/discharging cycling, due to chemical dissolution and ion intercalation/deintercalation-induced material pulverizatio…
In the past 5 years, colloidal I-III-VI nanocrystals such as CuInS2, CuInSe2, and AgInS2 have been intensively investigated for the potential to replace commonly available colloidal nanocrystals containing toxic elements in light-emitting and solar-harvesting applications. Many researchers from different disciplines a…
The micro developed and passivated process of corrosion pits of Al-Zn-Sn-Ga alloy were investigated by SEM,and the function relationship between pH value and pits depth in corrosion pits was also calculated in order to explain the expanded and passivated mechanism of pitting corrosion under the condition of neutral Na…
Magnesium sacrificial anodes with different Mn contents,i.e.0.08%,0.2%,0.3%,0.4%,0.5%and the Mg-IMn(0.6%and 0.7%Mn),which was used mainly in engineering applications were prepared by highly purified magnesium.The effects of Mn content on diminishing the Fe content,the microstructure and the electrochemical properties…
Black ceramic coating was obtained by micro-arc oxidation on 6063 aluminum alloy in an electrolyte containing silicate-phosphate.SEM,EDS,XRD,spectrophotometer,3D morphology instrument were used to characterize the morphology,composition,microstructure,blackness,surface roughness and corrosion resistance of the ceramic…
Potential and current distributions in a cathodically polarized crevice between a simulated disbonded coating and segmented Q345 steels were measured in this paper.The effects of agitation,oxygen concentration and pH value of initial solution on cathodic polarization behavior were studied.The results showed that agita…
This PDF file contains the front matter associated with SPIE Proceedings Volume 8462, including the Title Page, Copyright information, Table of Contents, Introduction, and the Conference Committee listing.
With the solid oxide fuel cells(SOFC) operation temperature reduced from 1000℃to 600～800℃, Fe-based ferritic stainless steels was the best candidate for SOFC interconnect applications.However,rapid scale growth and the volatility of Cr led to significant SOFC performance degradation.Two solutions were suggested to sol…