Competitive Adsorption of Ionic Liquids Versus Friction Modifier and Anti-Wear Additive at Solid/Lubricant Interface—Speciation with Vibrational Sum Frequency Generation Spectroscopy

Ngo, Dien; He, Xin; Luo, Huimin; Qu, Jun; Kim, Seong H.

doi:10.3390/lubricants8110098

Title: Competitive Adsorption of Ionic Liquids Versus Friction Modifier and Anti-Wear Additive at Solid/Lubricant Interface—Speciation with Vibrational Sum Frequency Generation Spectroscopy

Abstract

A modern lubricant contains various additives with different functionalities and the interactions or reactions between these additives could induce synergistic or antagonistic effects in tribological performance. In this study, sum frequency generation (SFG) spectroscopy was used to investigate competitive adsorption of lubricant additives at a solid/base oil interface. A silica substrate was used as a model solid surface. The lubricant additives studied here included two oil-soluble ionic liquids (ILs, [N888H][DEHP] and [P8888][DEHP]), an antiwear additive (secondary ZDDP), an organic friction modifier (OFM), and a dispersant (PIBSI). Our results showed that for mixtures of ZDDP and IL in a base oil (PAO4), the silica surface is dominated by the IL molecules. In the cases of base oils containing OFM and IL, the silica/lubricant interface is dominated by OFM over [N888H][DEHP], while it is preferentially occupied by [P8888][DEHP] over OFM. The presence of PIBSI in the mixture of PAO4 and IL leads to the formation of a mixed surface layer at the silica surface with PIBSI as a major component. The SFG results in this investigation provide fundamental insights that are helpful to design the formulation of new lubricant additives of desired properties.

Authors:

Ngo, Dien ^[1];

^[2];

^[3]

Pennsylvania State Univ., University Park, PA (United States); Avery Dennison, Mentor, OH (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Pennsylvania State Univ., University Park, PA (United States)

Publication Date:: Thu Nov 12 00:00:00 EST 2020

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

OSTI Identifier:: 1756267

Grant/Contract Number:: AC05-00OR22725

Resource Type:: Accepted Manuscript

Journal Name:: Lubricants

Additional Journal Information:: Journal Volume: 8; Journal Issue: 11; Journal ID: ISSN 2075-4442

Publisher:: MDPI

Country of Publication:: United States

Language:: English

Subject:: 25 ENERGY STORAGE; ionic liquids; lubricants; sum frequency generation spectroscopy; base oil; additives

Citation Formats


                    Ngo, Dien, He, Xin, Luo, Huimin, Qu, Jun, and Kim, Seong H. Competitive Adsorption of Ionic Liquids Versus Friction Modifier and Anti-Wear Additive at Solid/Lubricant Interface—Speciation with Vibrational Sum Frequency Generation Spectroscopy.  United States: N. p., 2020. 
Web.  doi:10.3390/lubricants8110098.

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                    Ngo, Dien, He, Xin, Luo, Huimin, Qu, Jun, & Kim, Seong H. Competitive Adsorption of Ionic Liquids Versus Friction Modifier and Anti-Wear Additive at Solid/Lubricant Interface—Speciation with Vibrational Sum Frequency Generation Spectroscopy.  United States.  https://doi.org/10.3390/lubricants8110098

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                    Ngo, Dien, He, Xin, Luo, Huimin, Qu, Jun, and Kim, Seong H. Thu .  
"Competitive Adsorption of Ionic Liquids Versus Friction Modifier and Anti-Wear Additive at Solid/Lubricant Interface—Speciation with Vibrational Sum Frequency Generation Spectroscopy".  United States.  https://doi.org/10.3390/lubricants8110098.  https://www.osti.gov/servlets/purl/1756267.

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@article{osti_1756267,

  title        = {Competitive Adsorption of Ionic Liquids Versus Friction Modifier and Anti-Wear Additive at Solid/Lubricant Interface—Speciation with Vibrational Sum Frequency Generation Spectroscopy},

  author       = {Ngo, Dien and He, Xin and Luo, Huimin and Qu, Jun and Kim, Seong H.},

  abstractNote = {A modern lubricant contains various additives with different functionalities and the interactions or reactions between these additives could induce synergistic or antagonistic effects in tribological performance. In this study, sum frequency generation (SFG) spectroscopy was used to investigate competitive adsorption of lubricant additives at a solid/base oil interface. A silica substrate was used as a model solid surface. The lubricant additives studied here included two oil-soluble ionic liquids (ILs, [N888H][DEHP] and [P8888][DEHP]), an antiwear additive (secondary ZDDP), an organic friction modifier (OFM), and a dispersant (PIBSI). Our results showed that for mixtures of ZDDP and IL in a base oil (PAO4), the silica surface is dominated by the IL molecules. In the cases of base oils containing OFM and IL, the silica/lubricant interface is dominated by OFM over [N888H][DEHP], while it is preferentially occupied by [P8888][DEHP] over OFM. The presence of PIBSI in the mixture of PAO4 and IL leads to the formation of a mixed surface layer at the silica surface with PIBSI as a major component. The SFG results in this investigation provide fundamental insights that are helpful to design the formulation of new lubricant additives of desired properties.},

  doi          = {10.3390/lubricants8110098},

  journal      = {Lubricants},

  number       = 11,

  volume       = 8,

  place        = {United States},

  year         = {Thu Nov 12 00:00:00 EST 2020},

  month        = {Thu Nov 12 00:00:00 EST 2020}

}

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Title: Competitive Adsorption of Ionic Liquids Versus Friction Modifier and Anti-Wear Additive at Solid/Lubricant Interface—Speciation with Vibrational Sum Frequency Generation Spectroscopy

Abstract

Citation Formats

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Tertiary and Quaternary Ammonium-Phosphate Ionic Liquids as Lubricant Additives journal, June 2016

Oil-Soluble Polymer Brush Grafted Nanoparticles as Effective Lubricant Additives for Friction and Wear Reduction journal, June 2016

The History and Mechanisms of ZDDP journal, October 2004

Mechanochemistry of Zinc Dialkyldithiophosphate on Steel Surfaces under Elastohydrodynamic Lubrication Conditions journal, January 2020

Improved Lubricating Performance by Combining Oil-Soluble Hairy Silica Nanoparticles and an Ionic Liquid as an Additive for a Synthetic Base Oil
journal, March 2018

Lubricating a bright future: Lubrication contribution to energy saving and low carbon emission
journal, October 2013

Global energy consumption due to friction in passenger cars
journal, March 2012

Friction Modifier Additives, Synergies and Antagonisms
journal, June 2019

Synergistic Effects Between Phosphonium-Alkylphosphate Ionic Liquids and Zinc Dialkyldithiophosphate (ZDDP) as Lubricant Additives
journal, July 2015

Synergistic Effects of MoDTC and ZDTP on Frictional Behaviour of Tribofilms at the Nanometer Scale
journal, November 2004

Compatibility between Various Ionic Liquids and an Organic Friction Modifier as Lubricant Additives
journal, August 2018

Ultralow Boundary Lubrication Friction by Three-Way Synergistic Interactions among Ionic Liquid, Friction Modifier, and Dispersant
journal, March 2020

Competitive Adsorption of Lubricant Base Oil and Ionic Liquid Additives at Air/Liquid and Solid/Liquid Interfaces
journal, June 2020

Ionic Liquids as Lubricant Additives: A Review
journal, January 2017

Implementing the Theory of Sum Frequency Generation Vibrational Spectroscopy: A Tutorial Review
journal, May 2005

Compression-Induced Topographic Corrugation of Air/Surfactant/Water Interface: Effect of Nanoparticles Adsorbed beneath the Interface
journal, June 2019

Sum Frequency Generation Study of the Room-Temperature Ionic Liquids/Quartz Interface
journal, March 2006

Surface Spectroscopy of Room-temperature Ionic Liquids on a Platinum Electrode: A Sum Frequency Generation Study
journal, September 2004

Interfacial Structure of Room-Temperature Ionic Liquids at the Solid–Liquid Interface as Probed by Sum Frequency Generation Spectroscopy
journal, December 2012

Phosphonium-Organophosphate Ionic Liquids as Lubricant Additives: Effects of Cation Structure on Physicochemical and Tribological Characteristics
journal, December 2014

Improving corrosion resistance of AZ31B magnesium alloy via a conversion coating produced by a protic ammonium-phosphate ionic liquid
journal, October 2014

Characterization of polyalphaolefins using halogen anion attachment in atmospheric pressure photoionization coupled with ion mobility spectrometry-mass spectrometry
journal, January 2018

Carbon-hydrogen stretching modes and the structure of n-alkyl chains. 1. Long, disordered chains
journal, December 1982

Vibrational spectra in the CH stretching region and the structure of the polymethylene chain
journal, January 1978

Surface Structure at Hexadecane and Halo-hexadecane Liquid/Vapor Interfaces
journal, July 2004

Carbon-hydrogen stretching modes and the structure of n-alkyl chains. 2. Long, all-trans chains
journal, February 1984

Molecular Structure and Ordering of Phospholipids at a Liquid−Liquid Interface
journal, June 1997

Dependence of Alkyl Chain Conformation of Simple Ionic Surfactants on Head Group Functionality As Studied by Vibrational Sum-Frequency Spectroscopy
journal, August 1997

A Comparative Study of the CD and CH Stretching Spectral Regions of Typical Surfactants Systems Using VSFS: Orientation Analysis of the Terminal CH ₃ and CD ₃ Groups
journal, December 2011

Vibrational Polarization Spectroscopy of CH Stretching Modes of the Methylene Group at the Vapor/Liquid Interfaces with Sum Frequency Generation
journal, June 2004

Quantitative spectral and orientational analysis in surface sum frequency generation vibrational spectroscopy (SFG-VS)
journal, April 2005

Sum frequency generation spectroscopy of tetraalkylphosphonium ionic liquids at the air–liquid interface
journal, May 2018

Effect of Chain Length on the Structure of Monolayers of Alkyltrimethylammonium Bromides (C _n TABs) at the Air−Water Interface
journal, January 1998

Phosphatidylcholine Monolayer Structure at a Liquid−Liquid Interface
journal, July 1998

Quantitative analysis of monolayer composition by sum-frequency vibrational spectroscopy
journal, August 1991

Study of the water/poly(ethylene glycol) interface by IR-visible sum-frequency generation spectroscopy
journal, January 2001

Spectroscopic and Computational Studies of Aqueous Ethylene Glycol Solution Surfaces
journal, January 2005

Infrared Spectra and Molecular Vibrations of Ethylene Glycol and Deuterated Derivatives
journal, January 1967

Analyses of the Adsorption Structures of Friction Modifiers by Means of Quantitative Structure-Property Relationship Method and Sum Frequency Generation Spectroscopy
journal, January 2010

Study of Friction-Reduction Properties of Fatty Acids and Adsorption Structures of their Langmuir–Blodgett Monolayers using Sum-Frequency Generation Spectroscopy and Atomic Force Microscopy
journal, October 2016

Analysis of the Interfacial Molecular Behavior of a Lubrication Film of n-Dodecane Containing Stearic Acid under Lubricating Conditions by Sum Frequency Generation Spectroscopy
journal, December 2016

Adsorption of Organic Friction Modifier Additives
journal, January 2020

Segregation of chain ends to polymer melt surfaces and interfaces
journal, May 1993

Tailoring the Attraction of Polymers toward Surfaces
journal, June 2019

Direct Measurement of the Transbilayer Movement of Phospholipids by Sum-Frequency Vibrational Spectroscopy
journal, July 2004

Friction Modifier Additives
journal, September 2015

Comparative Adsorption of Saturated and Unsaturated Fatty Acids at the Iron Oxide/Oil Interface
journal, January 2016

Antiwear Performance and Mechanism of an Oil-Miscible Ionic Liquid as a Lubricant Additive
journal, February 2012

Oil-miscible and non-corrosive phosphonium-based ionic liquids as candidate lubricant additives
journal, June 2012

Tertiary and Quaternary Ammonium-Phosphate Ionic Liquids as Lubricant Additives
journal, June 2016

Oil-Soluble Polymer Brush Grafted Nanoparticles as Effective Lubricant Additives for Friction and Wear Reduction
journal, June 2016

The History and Mechanisms of ZDDP
journal, October 2004

Mechanochemistry of Zinc Dialkyldithiophosphate on Steel Surfaces under Elastohydrodynamic Lubrication Conditions
journal, January 2020