The technique, a new development--different from Zewail's Nobel Prize-winning work in femtochemistry, the visual study of chemical processes occurring at femtosecond scales--allowed researchers to observe directly the transitioning atomic configuration of a prototypical phase-change material
, germanium telluride (GeTe), when it is hit by a femtosecond laser pulse.
Paraffin composites, in powder form, consist of tiny beads (1-200 um [3.94 x 10-5~0.0078 in]) which contain phase-change material
inside a polymer shell.
have developed an effective heat sink based on a carbon nanotube array anchored in a phase-change material
. As the exposed nanotubes are heated, the heat flows to the phase-change material
, which quickly absorbs the energy through the phase change.
A MANUFACTURER has launched a passively cooled enclosure that exploits a novel phase-change material
to maintain the temperature of electronics equipment at 10[degrees] lower than peak ambient temperatures.
During a combustion phase, biomass is burned in air to generate heat, which is absorbed by the phase-change material
. During a gasification phase, biomass reacts with steam in the absence of oxygen.
Experimental and theoretical analyses have been performed to determine dynamic thermal characteristics of building envelope components containing microencapsulated phase-change material
GST is called a phase-change material
because, when exposed to heat, areas of GST can change from an amorphous state, in which the atoms lack an ordered arrangement, to a crystalline state, in which the atoms are neatly lined up in a long-range order.
The presence of this nanostructure/matrix interface makes possible a rapid cooling that stabilizes the amorphous phase, and also enables us to tune the phase-change material
's transformation kinetics," said Chrzan.
To form the masterbatch pellets, a phase-change material
is blended with a low-molecular-weight dispersing polymer, and then blended with a high-molecular-weight carrier polymer.
Review of mathematical modeling on latent heat thermal energy storage systems using phase-change material
. Renewable and Sustainable Energy Reviews 12:999-1031.
developed an injection-molded heat exchanger using a phase-change material
with conductive fillers to improve efficiency.