Precise Heat Control: What Every Scientist Needs to Know About Pyrolytic Techniques to Solve Real Problems
No abstract available
Devivar, Rodrigo↗
Engineering topics
Devivar, Rodrigo
Publications and source records attributed to Devivar, Rodrigo.
Precise Heat Control: What Every Scientist Needs to Know About Pyrolytic Techniques to Solve Real Problems
The performance of a material is greatly influenced by its thermal and chemical properties. Analytical pyrolysis, when coupled to a GC‐MS system, is a powerful technique that can unlock the thermal and chemical properties of almost any substance and provide vital information. At NASA, we depend on precise thermal analysis instrumentation for understanding aerospace travel. Our analytical techniques allow us to test materials in the laboratory prior to an actual field test; whether the field test is miles up in the sky or miles underground, the properties of any involved material must be fully studied and understood in the laboratory.
Devivar, Rodrigo↗
Thermochemical Approaches for the Characterization of Materials
No abstract available
Devivar, Rodrigo↗
NASA-JSC Protocol for the Characterization of Single Wall Carbon Nanotube Material Quality
It is well known that the raw as well as purified single wall carbon nanotube (SWCNT) material always contain certain amount of impurities of varying composition (mostly metal catalyst and non-tubular carbon). Particular purification method also creates defects and/or functional groups in the SWCNT material and therefore affects the its dispersability in solvents (important to subsequent application development). A number of analytical characterization tools have been used successfully in the past years to assess various properties of nanotube materials, but lack of standards makes it difficult to compare these measurements across the board. In this work we report the protocol developed at NASA-JSC which standardizes measurements using TEM, SEM, TGA, Raman and UV-Vis-NIR absorption techniques. Numerical measures are established for parameters such as metal content, homogeneity, thermal stability and dispersability, to allow easy comparison of SWCNT materials. We will also report on the recent progress in quantitative measurement of non-tubular carbon impurities and a possible purity standard for SWCNT materials.
Arepalli, Sivaram↗
Long-Term Lunar Radiation Degradation Effects on Materials
The National Aeronautics and Space Administration (NASA) is focused on developing technologies for extending human presence beyond low Earth orbit. These technologies are to advance the state-of-the-art and provide for longer duration missions outside the protection of Earth's magnetosphere. One technology of great interest for large structures is advanced composite materials, due to their weight and cost savings, enhanced radiation protection for the crew, and potential for performance improvements when compared with existing metals. However, these materials have not been characterized for the interplanetary space environment, and particularly the effects of high energy radiation, which is known to cause damage to polymeric materials. Therefore, a study focusing on a lunar habitation element was undertaken to investigate the integrity of potential structural composite materials after exposure to a long-term lunar radiation environment. An overview of the study results are presented, along with a discussion of recommended future work.
Rojdev, Kristina↗