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

Title: Origin of the instability of octadecylamine Langmuir monolayer at low pH

Abstract

In this paper, 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.

Authors:

Avazbaeva, Zaure ^[1]; Sung, Woongmo ^[1]; Lee, Jonggwan ^[1]; Phan, Minh Dinh ^[1]; Shin, Kwanwoo ^[1]; Vaknin, David ^[2]; Kim, Doseok ^[1]

Sogang Univ., Seoul (Korea)
Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)

Publication Date:: Mon Nov 30 00:00:00 EST 2015

Research Org.:: Ames Lab., Ames, IA (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1239838

Report Number(s):: IS-J-8926
Journal ID: ISSN 0743-7463

Grant/Contract Number:: AC02-07CH11358; 2011-0017435; 2011-0017539

Resource Type:: Accepted Manuscript

Journal Name:: Langmuir

Additional Journal Information:: Journal Volume: 31; Journal Issue: 51; Journal ID: ISSN 0743-7463

Publisher:: American Chemical Society

Country of Publication:: United States

Language:: English

Subject:: 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats


                    Avazbaeva, Zaure, Sung, Woongmo, Lee, Jonggwan, Phan, Minh Dinh, Shin, Kwanwoo, Vaknin, David, and Kim, Doseok. Origin of the instability of octadecylamine Langmuir monolayer at low pH.  United States: N. p., 2015. 
Web.  doi:10.1021/acs.langmuir.5b03947.

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                    Avazbaeva, Zaure, Sung, Woongmo, Lee, Jonggwan, Phan, Minh Dinh, Shin, Kwanwoo, Vaknin, David, & Kim, Doseok. Origin of the instability of octadecylamine Langmuir monolayer at low pH.  United States.  https://doi.org/10.1021/acs.langmuir.5b03947

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                    Avazbaeva, Zaure, Sung, Woongmo, Lee, Jonggwan, Phan, Minh Dinh, Shin, Kwanwoo, Vaknin, David, and Kim, Doseok. Mon .  
"Origin of the instability of octadecylamine Langmuir monolayer at low pH".  United States.  https://doi.org/10.1021/acs.langmuir.5b03947.  https://www.osti.gov/servlets/purl/1239838.

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@article{osti_1239838,

  title        = {Origin of the instability of octadecylamine Langmuir monolayer at low pH},

  author       = {Avazbaeva, Zaure and Sung, Woongmo and Lee, Jonggwan and Phan, Minh Dinh and Shin, Kwanwoo and Vaknin, David and Kim, Doseok},

  abstractNote = {In this paper, 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.},

  doi          = {10.1021/acs.langmuir.5b03947},

  journal      = {Langmuir},

  number       = 51,

  volume       = 31,

  place        = {United States},

  year         = {Mon Nov 30 00:00:00 EST 2015},

  month        = {Mon Nov 30 00:00:00 EST 2015}

}

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Title: Origin of the instability of octadecylamine Langmuir monolayer at low pH

Abstract

Citation Formats

Ionization of monolayers of fatty acids from C14 to C18 journal, August 1963

Texture features of long-chain fatty acid monolayers at high pH of the aqueous subphase journal, December 1999

Stability of stearic acid monolayers on Artificial Sea Water journal, August 2012

Fatty acid monolayer dissociation and collapse: Effect of pH and cations journal, July 2008

Main and tilt transition in octadecylamine monolayers journal, August 2006

Interaction of water with a fatty acid Langmuir film journal, April 1998

Sum-Frequency Spectroscopic Study of Langmuir Monolayers of Lipids Having Oppositely Charged Headgroups journal, December 2010

Halide Ions Effects on Surface Excess of Long Chain Ionic Liquids Water Solutions journal, October 2013

Adsorption behaviors and structural transitions of organic cations on an anionic lipid monolayer at the air–water interface journal, January 2012

Surface Studies of Solids by Total Reflection of X-Rays journal, July 1954

Effects of Cardiolipin on Membrane Morphology: A Langmuir Monolayer Study journal, April 2015

Effect of Counterion on Monolayers of Hexadecyltrimethylammonium Halides at the Air−Water Interface journal, March 2000

Sum-frequency vibrational spectroscopy of a Langmuir film: Study of molecular orientation of a two-dimensional system journal, October 1987

Surface Vibrational Spectroscopic Studies of Hydrogen Bonding and Hydrophobicity journal, May 1994

Sum Frequency Generation Vibrational Spectroscopy Studies on Protein Adsorption journal, November 2002

Surface Adsorption and Micelle Formation of Surface Active Ionic Liquids in Aqueous Solution journal, April 2007

Electron Spectroscopy of Aqueous Solution Interfaces Reveals Surface Enhancement of Halides journal, January 2005

Specificity and Variation of Length Scale over Which Monovalent Halide Ions Neutralize a Charged Interface journal, March 2015

Extreme surface propensity of halide ions in water journal, June 2014

On the Mechanism of the Hofmeister Effect journal, September 2004

Counterion Effect on Interfacial Water at Charged Interfaces and Its Relevance to the Hofmeister Series journal, April 2014

Effect of Functional Group on the Monolayer Structures of Biodegradable Quaternary Ammonium Surfactants journal, November 2013

Structure and Lateral Interaction in Mixed Monolayers of Dioctadecyldimethylammonium Chloride (DOAC) and Stearyl Alcohol journal, April 2013

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New method for determination of surface pKa using second harmonic generation journal, October 1993

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Evaluation of pH at Charged Lipid/Water Interfaces by Heterodyne-Detected Electronic Sum Frequency Generation journal, January 2014

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Ionization of monolayers of fatty acids from C14 to C18
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Texture features of long-chain fatty acid monolayers at high pH of the aqueous subphase
journal, December 1999

Stability of stearic acid monolayers on Artificial Sea Water
journal, August 2012

Fatty acid monolayer dissociation and collapse: Effect of pH and cations
journal, July 2008

Main and tilt transition in octadecylamine monolayers
journal, August 2006

Interaction of water with a fatty acid Langmuir film
journal, April 1998

Sum-Frequency Spectroscopic Study of Langmuir Monolayers of Lipids Having Oppositely Charged Headgroups
journal, December 2010

Halide Ions Effects on Surface Excess of Long Chain Ionic Liquids Water Solutions
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Adsorption behaviors and structural transitions of organic cations on an anionic lipid monolayer at the air–water interface
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Surface Studies of Solids by Total Reflection of X-Rays
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Effects of Cardiolipin on Membrane Morphology: A Langmuir Monolayer Study
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Effect of Counterion on Monolayers of Hexadecyltrimethylammonium Halides at the Air−Water Interface
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Sum-frequency vibrational spectroscopy of a Langmuir film: Study of molecular orientation of a two-dimensional system
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Surface Vibrational Spectroscopic Studies of Hydrogen Bonding and Hydrophobicity
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Sum Frequency Generation Vibrational Spectroscopy Studies on Protein Adsorption
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Surface Adsorption and Micelle Formation of Surface Active Ionic Liquids in Aqueous Solution
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Electron Spectroscopy of Aqueous Solution Interfaces Reveals Surface Enhancement of Halides
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Evaluation of pH at Charged Lipid/Water Interfaces by Heterodyne-Detected Electronic Sum Frequency Generation
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