The thermal stability of nanocages is of great research value in both fundamental studies and practical applications. In this work, by focusing on silver−gold (Ag−Au) alloyed nanocages as a model system, we demonstrate that the wall thickness of the nanocage is a critical parameter in determining its thermal stability. We systematically evaluated the thermal stabilities of Ag−Au nanocages with different wall thicknesses in the range 3.8−13 nm in both solution and solid phases. The results showed that, in both phases, nanocages with thicker walls displayed better stabilities. At sufficiently high temperatures, the nanocages were deformed to thermodynamically more stable nanostructures. The deformation processes were found to be different for nanocages with various wall thicknesses, which were carefully monitored and analyzed by electron microscopy imaging. Changes in plasmonic properties of the nanocages during heat-induced deformation processes were also investigated.
Korean ki suryŏn (氣修練 cultivation of body and mind using ki-life
energy) is becoming more popular internationally. GiCheon (氣天), a
particular type of ki suryŏn, is portrayed here as an alchemical practice
of embodied knowledge. The term ‘technologies of the self’ (from Michel
Foucault) means practices of the self, but here also includes technical
tools, such as videos, DVDs, films, and websites. This paper will show
how the visual iconography of DVDs advertising GiCheon reflect the
values of their creators but also are instrumental for self-cultivation by
subtly programming our ways of living, acting, feeling, and perceiving.
And when the human body is represented on screen, as it is in ki suryŏn
DVDs, then this programming intensifies.
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