Reassessment of the surface activity of ferrocenyldimethylammonium surfactants

Nihal Aydogan; Craig A. Rosslee; Nicholas L. Abbott

doi:10.1016/S0927-7757(01)00823-8

Reassessment of the surface activity of ferrocenyldimethylammonium surfactants

Nihal Aydogan
, Craig A. Rosslee
, Nicholas L. Abbott

University of Wisconsin

Research output: Contribution to journal › Article › peer-review

16 Citations (Scopus)

Abstract

The paper reports an investigation of the surface behavior of N,N-dimethylferrocenylmethylundecyl ammonium bromide, Br^-Fc(CH₂)N⁺(CH₃)₂ (CH₂)₁₀CH₃, where Fc is ferrocene, by employing a simple molecular thermodynamic model and by comparing the predictions of the model to experimental measurements. Whereas a past study (Colloids Surfaces A: Physicochem. Eng. Aspect 94 (1995) 243) has reported that chemical oxidation (using AgNO₃) of Fc(CH₂)N⁺(CH₃)₂(CH₂) ₁₀CH₃ to Fc⁺(CH₂)N⁺(CH₃)₂(CH ₂)₁₀CH₃ (where Fc⁺ is the ferrocenium cation) leads to small (< 4 mN m^-1) changes in the surface tension of its aqueous solutions at 25°C, the molecular thermodynamic model reported here leads to predictions of changes in surface tension at 25°C that are larger than the past experimental study. In order to reconcile the predictions of our model and the past experiments, we performed new measurements of the surface tension of aqueous solutions of Fc(CH₂)N⁺(CH₃)₂(CH₂) ₁₀CH₃ and Fc⁺(CH₂)N⁺(CH₃)₂(CH ₂)₁₀CH₃, where the oxidized surfactant was prepared electrochemically and all measurements were performed at 40°C (above the measured Krafft temperature of 37°C). We find the new measurements to be in good agreement with the molecular thermodynamic model (∼ 15 mN m^-1 changes in surface tension upon oxidation of Fc(CH₂)N⁺(CH₃)₂(CH₂) ₁₀CH₃ to Fc⁺(CH₂)N⁺(CH₃)₂(CH ₂)₁₀CH₃). The results of our model and experimental measurements also support our proposition that electrostatic interactions between the cationic groups of these surfactants dominate the surface behavior of these surfactants.

Original language	English
Pages (from-to)	101-109
Number of pages	9
Journal	Colloids and Surfaces A: Physicochemical and Engineering Aspects
Volume	201
Issue number	1-3
DOIs	https://doi.org/10.1016/S0927-7757(01)00823-8
Publication status	Published - 5 Mar 2002
Externally published	Yes

Keywords

Electrochemical oxidation
Ferrocenyl surfactants
Molecular thermodynamic model
Surface tension

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10.1016/S0927-7757(01)00823-8

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title = "Reassessment of the surface activity of ferrocenyldimethylammonium surfactants",

abstract = "The paper reports an investigation of the surface behavior of N,N-dimethylferrocenylmethylundecyl ammonium bromide, Br-Fc(CH2)N+(CH3)2 (CH2)10CH3, where Fc is ferrocene, by employing a simple molecular thermodynamic model and by comparing the predictions of the model to experimental measurements. Whereas a past study (Colloids Surfaces A: Physicochem. Eng. Aspect 94 (1995) 243) has reported that chemical oxidation (using AgNO3) of Fc(CH2)N+(CH3)2(CH2) 10CH3 to Fc+(CH2)N+(CH3)2(CH 2)10CH3 (where Fc+ is the ferrocenium cation) leads to small (< 4 mN m-1) changes in the surface tension of its aqueous solutions at 25°C, the molecular thermodynamic model reported here leads to predictions of changes in surface tension at 25°C that are larger than the past experimental study. In order to reconcile the predictions of our model and the past experiments, we performed new measurements of the surface tension of aqueous solutions of Fc(CH2)N+(CH3)2(CH2) 10CH3 and Fc+(CH2)N+(CH3)2(CH 2)10CH3, where the oxidized surfactant was prepared electrochemically and all measurements were performed at 40°C (above the measured Krafft temperature of 37°C). We find the new measurements to be in good agreement with the molecular thermodynamic model (∼ 15 mN m-1 changes in surface tension upon oxidation of Fc(CH2)N+(CH3)2(CH2) 10CH3 to Fc+(CH2)N+(CH3)2(CH 2)10CH3). The results of our model and experimental measurements also support our proposition that electrostatic interactions between the cationic groups of these surfactants dominate the surface behavior of these surfactants.",

keywords = "Electrochemical oxidation, Ferrocenyl surfactants, Molecular thermodynamic model, Surface tension",

author = "Nihal Aydogan and Rosslee, \{Craig A.\} and Abbott, \{Nicholas L.\}",

year = "2002",

month = mar,

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doi = "10.1016/S0927-7757(01)00823-8",

language = "English",

volume = "201",

pages = "101--109",

journal = "Colloids and Surfaces A: Physicochemical and Engineering Aspects",

issn = "0927-7757",

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TY - JOUR

T1 - Reassessment of the surface activity of ferrocenyldimethylammonium surfactants

AU - Aydogan, Nihal

AU - Rosslee, Craig A.

AU - Abbott, Nicholas L.

PY - 2002/3/5

Y1 - 2002/3/5

N2 - The paper reports an investigation of the surface behavior of N,N-dimethylferrocenylmethylundecyl ammonium bromide, Br-Fc(CH2)N+(CH3)2 (CH2)10CH3, where Fc is ferrocene, by employing a simple molecular thermodynamic model and by comparing the predictions of the model to experimental measurements. Whereas a past study (Colloids Surfaces A: Physicochem. Eng. Aspect 94 (1995) 243) has reported that chemical oxidation (using AgNO3) of Fc(CH2)N+(CH3)2(CH2) 10CH3 to Fc+(CH2)N+(CH3)2(CH 2)10CH3 (where Fc+ is the ferrocenium cation) leads to small (< 4 mN m-1) changes in the surface tension of its aqueous solutions at 25°C, the molecular thermodynamic model reported here leads to predictions of changes in surface tension at 25°C that are larger than the past experimental study. In order to reconcile the predictions of our model and the past experiments, we performed new measurements of the surface tension of aqueous solutions of Fc(CH2)N+(CH3)2(CH2) 10CH3 and Fc+(CH2)N+(CH3)2(CH 2)10CH3, where the oxidized surfactant was prepared electrochemically and all measurements were performed at 40°C (above the measured Krafft temperature of 37°C). We find the new measurements to be in good agreement with the molecular thermodynamic model (∼ 15 mN m-1 changes in surface tension upon oxidation of Fc(CH2)N+(CH3)2(CH2) 10CH3 to Fc+(CH2)N+(CH3)2(CH 2)10CH3). The results of our model and experimental measurements also support our proposition that electrostatic interactions between the cationic groups of these surfactants dominate the surface behavior of these surfactants.

AB - The paper reports an investigation of the surface behavior of N,N-dimethylferrocenylmethylundecyl ammonium bromide, Br-Fc(CH2)N+(CH3)2 (CH2)10CH3, where Fc is ferrocene, by employing a simple molecular thermodynamic model and by comparing the predictions of the model to experimental measurements. Whereas a past study (Colloids Surfaces A: Physicochem. Eng. Aspect 94 (1995) 243) has reported that chemical oxidation (using AgNO3) of Fc(CH2)N+(CH3)2(CH2) 10CH3 to Fc+(CH2)N+(CH3)2(CH 2)10CH3 (where Fc+ is the ferrocenium cation) leads to small (< 4 mN m-1) changes in the surface tension of its aqueous solutions at 25°C, the molecular thermodynamic model reported here leads to predictions of changes in surface tension at 25°C that are larger than the past experimental study. In order to reconcile the predictions of our model and the past experiments, we performed new measurements of the surface tension of aqueous solutions of Fc(CH2)N+(CH3)2(CH2) 10CH3 and Fc+(CH2)N+(CH3)2(CH 2)10CH3, where the oxidized surfactant was prepared electrochemically and all measurements were performed at 40°C (above the measured Krafft temperature of 37°C). We find the new measurements to be in good agreement with the molecular thermodynamic model (∼ 15 mN m-1 changes in surface tension upon oxidation of Fc(CH2)N+(CH3)2(CH2) 10CH3 to Fc+(CH2)N+(CH3)2(CH 2)10CH3). The results of our model and experimental measurements also support our proposition that electrostatic interactions between the cationic groups of these surfactants dominate the surface behavior of these surfactants.

KW - Electrochemical oxidation

KW - Ferrocenyl surfactants

KW - Molecular thermodynamic model

KW - Surface tension

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DO - 10.1016/S0927-7757(01)00823-8

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JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects

JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects

IS - 1-3

ER -

Reassessment of the surface activity of ferrocenyldimethylammonium surfactants

Abstract

Keywords

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