[논문]Origin of the Instability of Octadecylamine Langmuir Monolayer at Low pH

Avazbaeva, Zaure; Sung, Woongmo; Lee, Jonggwan; Phan, Minh Dinh; Shin, Kwanwoo; Vaknin, David; Kim, Doseok

doi:10.1021/acs.langmuir.5b03947

Origin of the Instability of Octadecylamine Langmuir Monolayer at Low pH 원문보기

Langmuir : the ACS journal of surfaces and colloids, v.31 no.51, 2015년, pp.13753 - 13758

Avazbaeva, Zaure (Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011,) , Sung, Woongmo , Lee, Jonggwan , Phan, Minh Dinh , Shin, Kwanwoo , Vaknin, David , Kim, Doseok

Abstract ▼ AI-Helper

It has been reported that an octadecylamine (ODA) Langmuir monolayer becomes unstable at low pH values with no measurable surface pressure at around pH 3.5, suggesting significant dissolution of the ODA molecule into the subphase solution (Albrecht, Colloids Surf. A 2006, 284–285, 166–174). However, by lowering the pH further, ODA molecules reoccupy the surface, and a full monolayer is recovered at pH 2.5. Using surface sum-frequency spectroscopy and pressure–area isotherms, it is found that the recovered monolayer at very low pH has a larger area per molecule with many gauche defects in the ODA molecules as compared to that at high pH values. This structural change suggests that the reappearance of the monolayer is due to the adsorbed Cl– counterions to the protonated amine groups, leading to partial charge neutralization. This proposition is confirmed by intentionally adding monovalent salts (i.e., NaCl, NaBr, or NaI) to the subphase to recover the monolayer at pH 3.5, in which the detailed structure of the monolayer is confirmed by sum frequency spectra and the adsorbed anions by X-ray reflectivity.Graphic AbstractACS Electronic Supporting Info

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Origin of the Instability of Octadecylamine Langmuir Monolayer at Low pH 원문보기

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Origin of the Instability of Octadecylamine Langmuir Monolayer at Low pH 원문보기

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