Important On-campus Websites
Personal Information Policy
Main Campus (Daejeon)
Seoul Campus (Seoul)
Munji Campus (Daejeon)
Dogok Campus (Seoul)
How to get to KAIST
Giving to KAIST
Excellence in KAIST
Use of Gift
Make a Gift
College of Natural Sciences
College of Life Science and Bio Engineering
College of Engineering
College of Liberal Arts and Convergence Science
College of Business
General Studies Requirements
Education Support Program
Int'l Exchange Programs
International Scholar and Student Service Team
Center for Excellence in Learning and Teaching
Research Areas and Main Research Programs
Person in Charge by Research Area
Common Utilized Equipment
Office of Univ. Industry Coop.
World Economic Forum
KAIST Annual R&D Report
Student Health Insurance Association
Cultural Event Info.
Satisfaction survey of food&beverage Enterprise inside Campus
Day Care Center
Student Clubs and Activities
Undergraduate Student Clubs
Graduate Student Clubs
Center For Ethics And Human Rights
Intl’ Student Identity Card (ISIC)
KAIST in Media
International Scholar and Student Services
KAIST Discloses the Formation of Burning Ice in Oceanic Clay Rich Sediment
(from left: Professor Tae-Hyuk Kwon and PhD candidate Taehyung Park)
A KAIST research team has identified the formation of natural gas hydrates, so-called flammable ice, formed in oceans.
Professor Tae-Hyuk Kwon from the Department of Civil & Environmental Engineering and his team found that clay minerals in oceanic clay-rich sedimentary deposits promote formation of gas hydrates and proposed the principle of gas hydrate formation in the clayey sedimentary layers.
Gas hydrates are ice-like crystalline structures composed of hydrogen-bonded water molecules encapsulating gas molecules. They are also known as burning ice. Their deposits are so huge that they gain attention for alternative energy.
Conventionally, it was believed that formation of gas hydrates is limited in clay sedimentary deposits; however, unexpected abundance of natural gas hydrates in oceanic clay-rich sedimentary deposits raised the issue of how they formed.
The surfaces of natural clay minerals are negatively charged and, thus, unavoidably generate physicochemical interactions between clay and water. Such clay-water interactions have a critical role in the occurrence of natural gas hydrates in clay-rich sedimentary formations.
However, there has been experimental difficulty in analyzing hydrate formation because of the cations contained in clay particles, which balance the clay surface charges. Therefore, clay particles inevitably release the cations when mixed with water, which complicates the interpretation of experimental results.
To overcome this limitation, the team polarized water molecules with an electric field and monitored the induction times of water molecules forming gas hydrates.
They found that the 10 kV/m of electric field promoted gas hydrate nucleation under certain conditions rather than slowing it down, due to the partial breakage of the hydrogen bonded water clusters and the lowered thermal energy of water molecules.
Professor Kwon said, “Through this research, we gained better insight into the origin of gas hydrates occurrence in clay-rich sedimentary deposits. In the near future, we will soon be able to commercially produce methane gas from natural gas hydrate deposits.”
This research, led by PhD candidate Taehyung Park, was published online in Environmental Science and Technology on February 3. (doi: 10.1021/acs.est.7b05477)
Figure 1. Formation of gas hydrates with water molecules
Figure 2. Enhancement and inhibition of gas hydrates