Lecithin/CaCl2 유기젤의 온도 영향에 대한 유변학적 연구

정연건; 이희영; Yeon-Geon Jung; Hee-Young Lee

Applied Chemistry for Engineering, Vol.29, No.2, 244-247, April, 2018

DOI10.14478/ace.2018.1021 Export Citation

Lecithin/CaCl2 유기젤의 온도 영향에 대한 유변학적 연구

Effects of Temperature on the Rheology of Lecithin/CaCl2 Organogels

정연건, 이희영^†

금오공과대학교 화학공학과

Yeon-Geon Jung, and Hee-Young Lee^†

Department of Chemical Engineering, The Kumoh National Institute of Technology, 61 Daehak-ro, Gumi-si, Gyeongsangbuk-do 39177, Republic of Korea

E-mail:

초록

쌍성이온 인지질의 한 종류인 lecithin은 decane과 같은 유기용매상에서 구 모양의 역마이셀을 만든다. 이러한 lecithin 을 포함하고 있는 유기졸에 염화칼슘과 같은 다원자가의 이온을 첨가하면 유기젤이 형성된다. 이러한 유기젤은 연료의 젤화, 음식 준비, 약물전달 등에 다양하게 활용될 수 있다. 본 연구에서는 이러한 젤의 온도 영향을 유변학적 관점에서 조사하였다. 유기젤의 유변학 연구를 통하여 유기젤의 녹는점(~95 ℃)과 온도가 증가하면서 젤의 고체와 같은 성질이 줄어듦을 확인하였다. 온도가 증가함에 따라서 유기젤의 고체와 같은 성질이 줄어드는 이유는 lecithin과 염화 칼슘 사이의 정전기적 상호작용이 약해지기 때문으로 판단된다.

Lecithin, a zwitterionic phospholipid, forms spherical reverse micelles in organic solvents such as decane. The addition of multivalent ions like calcium chloride to lecithin organosols induces the transformation of organosols into organogels. A variety of applications of such organogels were found in gelation of fuels, food processing and drug delivery. Here, we investigated the effect of temperature on their rheological properties. In particular, the organogels showed a distinct melting temperature (~95 ℃) and their elastic properties decreased with increasing temperature. This is maybe due to the fact that the electrostatic interaction between lecithin and calcium chloride could be weaken with increasing temperature.

Keywords:organogel;rheology;temperature;lecithin/CaCl2

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[2] Evans DF, Wennerstrom H, The Colloidal Domain: Where Physics, Chemistry, Biology, and Technology Meet, Wiley-VCH, New York, NY, USA (2001).

[3] Knezevic ZD, Siler-Marinkovic SS, Mojovic LV, Appl. Microbiol. Biotechnol., 49(3), 267 (1998)

[4] Madamwar D, Thakar A, Appl. Biochem. Biotechnol., 118(1-3), 361 (2004)

[5] Van Horn WD, Simorellis AK, Flynn PF, J. Am. Chem. Soc., 127(39), 13553 (2005)

[6] Dreher F, Walde P, Walther P, Wehrli E, J. Control. Release, 45, 131 (1997)

[7] Kreilgaard M, Adv. Drug. Deliv. Rev., 54, S77 (2002)

[8] Kumar R, Katare OP, AAPS PharmSciTech, 6, E298 (2005)

[9] Dreiss CA, Soft Matter, 3, 956 (2007)

[10] Tung SH, Huang YE, Raghavan SR, J. Am. Chem. Soc., 128(17), 5751 (2006)

[11] Tung SH, Huang YE, Raghavan SR, Langmuir, 23(2), 372 (2007)

[12] Lee HY, Diehn KK, Ko SW, Tung SH, Raghavan SR, Langmuir, 26(17), 13831 (2010)

[13] Lin ST, Lin CS, Chang YY, Whitten AE, Sokolova A, Wu CM, Ivanov VA, Khokhlov AR, Tung SH, Langmuir, 32(46), 12166 (2016)

[14] Lee YK, Lee HY, Colloids Surf. A: Physicochem. Eng. Asp., 538, 661 (2018)

[15] Lee HY, Diehn KK, Sun KS, Chen TH, Raghavan SR, J. Am. Chem. Soc., 133(22), 8461 (2011)

[16] Tung SH, Huang YE, Raghavan SR, Soft Matter, 4, 1086 (2008)

[17] Kumar R, Ketner AM, Raghavan SR, Langmuir, 26(8), 5405 (2010)

[18] Willard DM, Riter RE, Levinger NE, J. Am. Ceram. Soc., 120, 4151 (1998)

[19] Shchipunov YA, Colloids Surf. A: Physicochem. Eng. Asp., 183, 541 (2001)

[20] Raghavan SR, Langmuir, 25(15), 8382 (2009)