Exploration of the cell parameter and thermal expansion behavior in Au and ZrW2O8 nanoparticles
EMSL Project ID
26990
Abstract
. The phenomenon of negative coefficient of thermal expansion (NTE), where materials shrink upon heating instead of cooling, has recently been attracting considerable attention. Dimensionally stable materials often require the addition of such materials, and few exist. Once of the most widely researched materials is zirconium tungstate (ZrW2O8). Stable over a wide temperature range it has demonstrated use in helping achieve dimensional stability. The synthesis of nano parallelepipeds of ZrW2O8 has been of interest lately and CTE has not been verified. Recently, an NTE (-25 ppm K-1) was reported for 4 nm Au particles. Bulk Au has a CTE of +14 ppm K-1, and the NTE reported for the nano-sized particles is not well understood, nor has this been confirmed by a research group outside of the original group in China. Synthesized nano Au particles and ZrW2O8 nano parallelepipeds cell parameters will be examined as a function of temperature.
Project Details
Project type
Exploratory Research
Start Date
2007-08-07
End Date
2008-08-10
Status
Closed
Released Data Link
Team
Principal Investigator