- Press Release
- Dec 6, 2022
Zeolite Crystal Growth (ZCG) Furnace Results
and ground-based science team completed the Expedition 5 ZCG experiments
on July 12, 2002. The samples will remain inside the deactivated furnace
until they are returned to Earth on STS-112 and replaced by a new set of
samples for mission 9A.
ZCG mission 8A experiment was completed on May 6a day earlier than
was the first payload to receive full-time support from the Active Rack
Isolation System (ARIS), a system that reduces vibration like shock-absorbers
on a car. ARIS underwent thorough testing throughout Increments 2, 3 and
4, and went online in April.
grown zeolite crystals have proven to be larger and better-ordered than
Earth-grown crystals. Theoretically, it is possible to grow crystals in
microgravity that are 500 to 1000 times larger than terrestrially-grown
crystals. Zeolite A crystals grown during USML-1 achieved 96 percent area
and 175 percent volume increases over Earth grown samples, and approached
theoretically perfect aluminum/silicon ratios.
materials have great potential for commercial applications. Their shapes
form complex, open frameworks that act as absorbents or filters, and they
can be used in diverse ways: as absorbents for oil spills; to control
household odors; to filter ammonia from municipal wastewater; and as a
growth medium for hydroponic horticulture. They have been suggested as
nuclear waste scavengers and quantum confinement hosts for semiconductor
materials. Larger, better-constructed crystals, made possible by space-based
facilities, are more suitable for research and use in commercial materials.
and A. Sacco, Jr. 1998. The synthesis of zeolites under microgravity conditions:
a review. Zeolites 23:119-136.
Warzywoda, N. Bac, and A. Sacco, Jr. 1999. Synthesis of large zeolite
X crystals. J of Crystal Growth 204:539-541.
Product Development Source Book: Product Lines (see CAMMP)