UV-Vis spectroscopy of stardust

UV-Vis spectroscopy of stardust

NASA’s Stardust mission flew through the coma of comet Wild 2 in January 2004, capturing dust grains as it did so. The grains were returned safely to Earth in January 2006, and are in the process of being distributed to investigators. As members of the Spectroscopy Preliminary Examination Team, we are preparing to analyse Stardust grains. Our contribution is to measure the spectrum of the grain...

Infrared, Uv/vis and Raman Spectroscopy of Comet Wild-2 Samples Returned by the Stardust Mission

RETURNED BY THE STARDUST MISSION. L. P. Keller, S. Bajt, G. A. Baratta, J. Borg, J. Brucato, M. Burchell, L. Colangeli, L. d'Hendecourt, Z. Djouadi, G. Ferrini, G. Flynn, I. A. Franchi, M. Fries, M. M. Grady, G. Graham, F. Grossemy, A. Kearsley, G. Matrajt, V. Mennella, L. Nittler, M. E. Palumbo, A. Rotundi, B. Wopenka and M. Zolensky. NASA-JSC, Houston, TX 77058, LLNL, Livermore, Ca 94550, Ins...

Analysis of poly(amidoamine) dendrimer structure by UV-vis spectroscopy.

We report a UV-vis spectroscopic study of four different types of poly(amidoamine) dendrimers. The results indicate that the degree of protonation of the interior tertiary amines of these dendrimers correlates directly to an absorption band with λ(max) in the range of 280-285 nm. Specifically, at low pH, the tertiary amines are protonated and the 280-285 nm band is absent. However, at elevated ...

Significance of UV-Vis spectroscopy in in vitro release studies

SUSPENSION STABILITY OF TITANIA NANOPARTICLES STUDIED BY UV-VIS SPECTROSCOPY METHOD

Ultraviolet–Visible (UV–Vis) spectroscopy was used, in the current investigation, to explore the dispersion and stability of titania nanoparticles in an aqueous media with different types of dispersants. Hydrochloric and nitric acids as well as ammonia were used to determine the stability of the suspension in the acidic region (pH=2.5) and basic area (pH=9.5), respectively. In addition, for mea...