Study on the property of cylindrical micellar solutions with observation of the additional amphiphilic molecules effects = 첨가된 양친성 분자의 영향 관찰을 통한 실린더형 마이셀 용액의 특성 연구

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Amphiphilic molecules spontaneously self-organize into various structures in the aqueous solution above a certain concentration with their hydrophobic ``tail`` parts pointed inward and their hydrophilic ``head`` parts pointed outward, by hydrophobic effect. While the hydrophobic interaction leads to the self-assembly of surfactants, the equilibrium geometry of an assembled structure is affected by the various factors such as a steric molecular shape, concentration and the electrostatic interaction. Among the self-assembled systems of surfactants, the cylindrical micellar system shows various interesting phenomena such as a micellar length growth, branch formation and the micelle-to-lamellar transition depending on the thermodynamic conditions. In this study, we observed the overall properties of the cylindrical micellar solutions and showed that these properties can be controlled by adding a small amount of other amphiphilic molecules. Also, we considered and discussed about a correlation between changes of these properties and the possibility for the curvature energy argument to describe the surfactant self assemble system with an aggregate level not a monomer molecular level. For these, we have measured the micellar size, the cloud temperature and the micelle-to-lamellar transition temperature when a small amount of other amphiphilic molecule was mixed to the neutral cylindrical micellar solution (penta-ethyleneglycol mono n-dodecyl ether; $C_{12}E_5$). The mixed surfactants were a cationic (Dodecyl trimethyl ammonium bromide; DTAB) and a neutral (1-Tridecanoyl-2-Hydroxy-sn-Glycero-3-Phosphocholine; LysoPC) spherical micelle-forming surfactant, and a bilayer-forming neutral lipid (DL- $\alpha$ -phosphatidylcholine dimyristol; DMPC). At first we observed an unusual length shortening of a nonionic/ionic mixed cylindrical micelle as the concentration($\sl{C}$) increases quantitatively by using SANS experiments. For this behavior occured in the nonionic surf...
Advisors
Kim, Mahn-Wonresearcher김만원researcher
Description
한국과학기술원 : 물리학과,
Publisher
한국과학기술원
Issue Date
2009
Identifier
309017/325007  / 020035040
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 물리학과, 2009.2, [ x, 78 p. ]

Keywords

Self assembly; surfactant; micelle; SANS; 자기조립; 계면활성제; 마이셀; 소각중성자산란

URI
http://hdl.handle.net/10203/47440
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=309017&flag=dissertation
Appears in Collection
PH-Theses_Ph.D.(박사논문)
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