Materials Literature
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Abstract magnified image Modified nitration of tetraphenylporphyrin at para of phenyl with HNO3/Cl3CCOOH and one‐pot nitration of free tetraarylporphyrins to metalized 2‐nitroporphyrin in high yield are described. A novel reducer of Zn/HCOONH4 has been developed for above nitro of porphyrin into amino effectively. J.…
In the study of faint, extended sources at high resolving power, interferometry offers significant etendue advantages relative to conventional dispersive grating spectrometers. A Spatial Heterodyne Spectrometer (SHS) is a compact format two-beam interferometer that produces wavenumber dependent 2-D Fizeau fringe patte…
Interaction between Ti-47Al-2Cr-2Nb alloy and inner layer Y_2O_3 of Y_2O_3/A1_2O_3 double-layer ceramic tube has been investigated during directional solidification.The results show that the Y_2O_3 layer effectively prevents the chemical reactions between TiAl alloy melt and exterior layer Al_2O_3 with lower chemical…
Designers of future space vehicles envision simplifying the Atmosphere Revitalization (AR) system by combining the functions of trace contaminant (TC) control and carbon dioxide removal into one swing-bed system. Flow rates and bed sizes of the TC and CO2 systems have historically been very different. There is uncerta…
Numerous unexpected operational issues relating to the abrasive nature of lunar dust, such as scratched visors and spacesuit pressure seal leaks, were encountered during the Apollo missions. To avoid reoccurrence of these unexpected detrimental equipment problems on future missions to the Moon, a series of two- and th…
Abstract Useful yields have been measured for a series of organic compounds using Ar + , SF 5 + and Bi 3 + primary ion bombardment under high dose (>10 13 ions/cm 2 ) SIMS sputtering conditions on both magnetic sector and ToF‐SIMS instruments. A precision inkjet deposition system was used to produce well defined array…
We investigate experimentally and theoretically the behavior of the interference coefficient of absorption of X-ray radiation of a quartz single crystal in Laue geometry in the presence of temperature gradient. The total intensity of transmitted X-ray radiation and that reflected from different families of reflecting…
Molecular states of terpyridine ligands in supramolecular coordination assemblies were investigated by means of scanning tunneling microscopy/spectroscopy conducted at cryogenic temperature. Submolecular-resolved signals manifest that within the molecules, the empty states at the moieties that are directly involved in…
SIMPLE is an optimized near IR echelle spectrograph for the E-ELT assisted by adaptive optics. It delivers a complete 0.84-2.5μm spectrum in one exposure with resolution up to R=130,000, nearly diffraction limited pixel scale and limiting magnitudes down to JHK~20. Its most prominent science cases include the study of…
The in situ formation of sub-100 nm solid frameworks stabilized against dissolution by the addition of nanoseeds allows the facile and controllable synthesis of TiO(2) (anatase) mesocrystalline structures with spherical shape, mesoporosity and sizes between 50 and 70 nm. As an example of their multifunctionality, thes…
Alzheimer disease (AD) is a devastating neurodegenerative disease with no cure. The pathogenesis of AD is believed to be driven primarily by amyloid-beta (Abeta), the principal component of senile plaques. Abeta is an approximately 4-kDa peptide generated via cleavage of the amyloid-beta precursor protein (APP). Curcu…
The thick layer of powdery grey sub-micron/micron sized dust grains that cover the lunar surface presents a significant challenge for NASA's Moon exploration program. The highly- abrasive dust particles, which are easily transported over the Moon's surface and have highly adhesive properties, can negatively impact the…
FIFI LS is the German far-infrared integral field spectrometer for the SOFIA airborne observatory. The instrument consists of two independent integral field spectrometers for two different wavelength bands (45-110 μm and 100-200 μm). A dichroic filter enables simultaneous observation of two different spectral lines in…
Nanointerface engineering using unique two-dimensional (2D) crystals of nanosheets overcomes the difficulty in controlling crystal growth processes on amorphous substrates. Fabrication of highly oriented anatase (001) films on widely used glass substrates has been achieved for the first time utilizing a monolayer film…
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Single-crystalline V(2)O(5)·xH(2)O nanorings and microloops were chemically assembled via an ion-induced chemical spinning route in the designed hydrothermal system. The morphology and structure of products were investigated by means of scanning electron microscopy (SEM) and transmission electron microscopy (TEM). X-r…
The Korea Astronomy and Space Science Institute (KASI) and the Department of Astronomy at the University of Texas at Austin (UT) are developing a near infrared wide-band high resolution spectrograph, IGRINS. IGRINS can observe all of the H- and K-band atmospheric windows with a resolving power of 40,000 in a single ex…
To seek half-metallic ferromagnets compatible with the GeSi semiconductor, we use state-of-the-art density-functional-theory methods to study cubic $\mathrm{VGe_3Si_4}$. After optimizing its crystal structure with various magnetic orders considered, we find the ferromagnetic structure is the ground state phase and inv…
We theoretically study the stability conditions of the ferroelectric ice of the Cmc21 structure, which has been considered, for decades, one of the most promising candidates of the low temperature proton-ordered phase of pure ice Ih. It turned out that the Cmc21 structure is stable only with a certain amount of dopant…
Abstract We synthesized a mto (= monothiooxalato)-bridged hetero-metal complex, Ph4P[ZnIIFeIII(mto)3] consisting of FeIIIO3S3 and ZnIIO6 octahedra and investigated its physical properties. Ph4P[ZnIIFeIII(mto)3] has a two-dimensional honeycomb network structure. The ESR and 57Fe Mössbauer spectra revealed that the rapi…