Gamma-Ray Radiation-Induced Surface Hydrophobic Effects in Invar Alloy

Abstract:

In this paper, we report a new phenomenon observed in the gamma-ray radiation-induced hydrophobic effects on an Invar surface: When the Invar alloy is subjected to different doses of gamma-ray irradiation, the contact angle increases with the radiation dose. Invar samples with exposed to a higher dose appear more hydrophobic, but this tendency disappears following post-irradiation etching. The contact angles of the irradiated and etched Invar samples can be restored back to a stable value with small deviation after 30 min of annealing at 150°C. X-ray diffraction (XRD) analysis found no crystalline structural changes. High resolution field emission scanning microscope (FE-SEM) analyses showed that irradiation might induce crack-like surfaces which could be removed at higher radiation dose in the following acid etchings. It is believed that the chemical bonds of Invar oxide on the surface were broken by the gamma-ray irradiation, thus raising the likelihood of binding with free ions in the air and resulting in the exclusion of the hydrophilic OH bonds, leaving a hydrophobic post-irradiation Invar surface.

• Periodical: Advanced Materials Research (Volumes 482-484)
• Pages: 1585-1591
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.482-484.1585
• Online since: February 2012
• Authors: Cheng Fu Yang, Wei Wen Wang, Hsin Hwa Chen, Wei Tan Sun, Chi Lin Shiau, Jing Jenn Lin
• Keywords: Gamma-Ray, Hydrophobic, Invar, Radiation

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