This study reports a visual observation of the formation and growth of ionic semiclathrate hydrate on the surface of a Tetrabutylammonium bromide (TBAB) aqueous solution and CO2+N2 gas mixture. The composition of CO2+N2 gas mixture was 20 : 80. The experimental temperature range was from 280 K to 290 K, under the pressures of 2.3MPa and 4.7MPa, at wTBAB=0.10 and wTBAB=0.40, where wTBAB denotes the mass fraction of TBAB in the aqueous solution. At wTBAB=0.40, the hydrate crystals were initially observed to grow within the droplet, and followed by lateral growth at the droplet surface; but at wTBAB=0.10, the hydrate crystals grew exclusively in the liquid phase and did not cover the droplet surface. Two types of different crystals with different sizes were clearly observed.

Clathrate Hydrate Crystal Growth Carbon Capture Crystal Morphology Tetrabutylammonium Bromide

IPCC. Climate Change 2014, Mitigation of climate change, Contribution of Working Group III to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change., Cambridge University Press, Cambridge (2014).
Kang SP, Lee H, Environ. Sci. Technol., 34, 4397 (2000)
Mori YH, J. Chem. Ind. Eng., 54, 1 (2003)
Aifaa M, Kodama T, Ohmura R, Cryst. Growth Des., 15, 559 (2015)
Lee H, Lee JW, Kim DY, Park J, Seo YT, Zeng H, Moudrakovski IL, Ratcliffe CI, Ripmeester JA, Nature, 434, 743 (2005)
Shin K, Kim Y, Strobel TA, Prasad PSR, Sugahara T, Lee H, Sloan ED, Sum AK, Koh CA, J. Phys. Chem. A, 113(23), 6415 (2009)
Brewer PG, Friederich C, Peltzer ET, Orr FM, Science, 284(5416), 943 (1999)
Ohmura R, Mori YH, Environ. Sci. Technol., 32, 1120 (1998)
Tohidi B, Yang J, Salehabadi M, Anderson R, Chapoy A, Environ. Sci. Technol., 44, 1509 (2010)
Ogawa T, Ito T, Watanabe K, Tahara K, Hiraoka R, Ochiai J, Ohmura R, Mori YH, Appl. Therm. Eng., 26, 2157 (2006)
Park Y, Kim DY, Lee JW, Huh DG, Park KP, Lee J, Lee H, Natl. Acad. Sci. U.S.A., 34, 12690 (2006)
Seo YT, Moudrakovski IL, Ripmeester JA, Lee JW, Lee H, Environ. Sci. Technol., 39, 2315 (2005)
Bird RB, Stewart WE, Lightfoot EN, Transport Phenomena, 2nd Ed., Wiley, Hoboken, NJ, 196 (2006).
Darbouret M, Cournil M, Herri JM, Int. J. Refrig., 28, 663 (2005)
Zhong DL, Englezos P, Energy Fuels, 26(4), 2098 (2012)
Zhong DL, Ye Y, Yang C, J. Chem. Eng. Data, 56(6), 2899 (2011)
Babu P, Chin WI, Kumar R, Linga P, Ind. Eng. Chem. Res., 53(12), 4878 (2014)
Li S, Fan S, Wang J, Lang X, Liang D, J. Nat. Gas Chem., 18, 15 (2009)
Belandria V, Mohammadi AH, Richon D, Chem. Eng. Sci., 84, 40 (2012)
Lee Y, Lee S, Lee J, Seo Y, Chem. Eng. J., 246, 20 (2014)
Deschamps J, Dalmazzone D, J. Therm. Anal. Calorim., 98, 113 (2009)
Oyama H, Shimada W, Ebinuma T, Kamata Y, Takeya S, Uchida T, Nagao J, Narita H, Fluid Phase Equilib., 234(1-2), 131 (2005)
Veluswamy HP, Yang T, Linga P, Cryst. Growth Des., 14, 1950 (2014)
Koyanagi S, Ohmura R, Cryst. Growth Des., 13, 2087 (2013)
Akiba H, Ueno H, Ohmura R, Cryst. Growth Des., 15, 3963 (2015)
Chapoy A, Anderson R, Tohidi B, J. Am. Chem. Soc., 129(4), 746 (2007)
Arjmandi M, Chapoy A, Tohidi B, J. Chem. Eng. Data, 52(6), 2153 (2007)
Meysel P, Oellrich L, Bishnoi PR, Clarke MA, J. Chem. Thermodyn., 43(10), 1475 (2011)
Kim S, Seo Y, Appl. Energy, 154, 987 (2015)
Muromachi S, Udachin KA, Shin K, Alavi S, Moudrakovski IL, Ohmura R, Ripmeester JA, Chem. Commun., 50, 11476 (2014)
Sato K, Tokutomi H, Ohmura R, Fluid Phase Equilib., 337, 115 (2013)
Tanaka R, Sakemoto R, Ohmura R, Cryst. Growth Des., 9, 2529 (2009)
Saito K, Kishimoto M, Tanaka R, Ohmura R, Cryst. Growth Des., 11, 295 (2011)
Georgiadis A, Maitland G, Trusler JPM, Bismarck A, J. Chem. Eng. Data, 55(10), 4168 (2010)
Akiba H, Ohmura R, J. Chem. Thermodyn., 92, 72 (2015)
Yan W, Zhao GY, Chen GJ, Guo TM, J. Chem. Eng. Data, 46, 1544 (2001)