Forces within single pairs of charged colloids in aqueous solutions of ionic liquids as studied by optical tweezers

Mahdy M. Elmahdy; Christof Gutsche; Friedrich Kremer

doi:10.1021/jp107673f

Forces within single pairs of charged colloids in aqueous solutions of ionic liquids as studied by optical tweezers

Mahdy M. Elmahdy, Christof Gutsche, Friedrich Kremer

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Abstract

Forces of interaction within single pairs of negatively charged microsized blank colloids in aqueous solutions of water miscible room temperature ionic liquids (RTILs) have been measured at varying concentrations and pH by using optical tweezers (OT). Three different water miscible RTILs (1-butyl-3- methylimidazolium tetrafluoroborate [BMIM-BF₄], 1-butyl-3- methylimidazolium trifluoromethanesulfonate [BMIM-TfO], and 1-butyl-3- methylimidazolium chloride [BMIM-Cl]) having the same organic cation [BMIM] ⁺ and different inorganic anions ([BF₄]^-, [TfO]^-, and Cl^-) are used and compared with the high temperature molten salt (KCl). The experimental data are well described by a size-corrected screened Coulomb interaction approach which originates from the linearized Poisson-Boltzmann (PB) equation. The effective surface charge density σ derived from the fitted force-separation data is found to be concentration and pH dependent.

Original language	English
Pages (from-to)	19452-19458
Number of pages	7
Journal	Journal of Physical Chemistry C
Volume	114
Issue number	45
DOIs	https://doi.org/10.1021/jp107673f
State	Published - 18 Nov 2010
Externally published	Yes

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title = "Forces within single pairs of charged colloids in aqueous solutions of ionic liquids as studied by optical tweezers",

abstract = "Forces of interaction within single pairs of negatively charged microsized blank colloids in aqueous solutions of water miscible room temperature ionic liquids (RTILs) have been measured at varying concentrations and pH by using optical tweezers (OT). Three different water miscible RTILs (1-butyl-3- methylimidazolium tetrafluoroborate [BMIM-BF4], 1-butyl-3- methylimidazolium trifluoromethanesulfonate [BMIM-TfO], and 1-butyl-3- methylimidazolium chloride [BMIM-Cl]) having the same organic cation [BMIM] + and different inorganic anions ([BF4]-, [TfO]-, and Cl-) are used and compared with the high temperature molten salt (KCl). The experimental data are well described by a size-corrected screened Coulomb interaction approach which originates from the linearized Poisson-Boltzmann (PB) equation. The effective surface charge density σ derived from the fitted force-separation data is found to be concentration and pH dependent.",

author = "Elmahdy, \{Mahdy M.\} and Christof Gutsche and Friedrich Kremer",

year = "2010",

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doi = "10.1021/jp107673f",

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journal = "Journal of Physical Chemistry C",

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T1 - Forces within single pairs of charged colloids in aqueous solutions of ionic liquids as studied by optical tweezers

AU - Elmahdy, Mahdy M.

AU - Gutsche, Christof

AU - Kremer, Friedrich

PY - 2010/11/18

Y1 - 2010/11/18

N2 - Forces of interaction within single pairs of negatively charged microsized blank colloids in aqueous solutions of water miscible room temperature ionic liquids (RTILs) have been measured at varying concentrations and pH by using optical tweezers (OT). Three different water miscible RTILs (1-butyl-3- methylimidazolium tetrafluoroborate [BMIM-BF4], 1-butyl-3- methylimidazolium trifluoromethanesulfonate [BMIM-TfO], and 1-butyl-3- methylimidazolium chloride [BMIM-Cl]) having the same organic cation [BMIM] + and different inorganic anions ([BF4]-, [TfO]-, and Cl-) are used and compared with the high temperature molten salt (KCl). The experimental data are well described by a size-corrected screened Coulomb interaction approach which originates from the linearized Poisson-Boltzmann (PB) equation. The effective surface charge density σ derived from the fitted force-separation data is found to be concentration and pH dependent.

AB - Forces of interaction within single pairs of negatively charged microsized blank colloids in aqueous solutions of water miscible room temperature ionic liquids (RTILs) have been measured at varying concentrations and pH by using optical tweezers (OT). Three different water miscible RTILs (1-butyl-3- methylimidazolium tetrafluoroborate [BMIM-BF4], 1-butyl-3- methylimidazolium trifluoromethanesulfonate [BMIM-TfO], and 1-butyl-3- methylimidazolium chloride [BMIM-Cl]) having the same organic cation [BMIM] + and different inorganic anions ([BF4]-, [TfO]-, and Cl-) are used and compared with the high temperature molten salt (KCl). The experimental data are well described by a size-corrected screened Coulomb interaction approach which originates from the linearized Poisson-Boltzmann (PB) equation. The effective surface charge density σ derived from the fitted force-separation data is found to be concentration and pH dependent.

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JO - Journal of Physical Chemistry C

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Forces within single pairs of charged colloids in aqueous solutions of ionic liquids as studied by optical tweezers

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