Aggregation Behavior of Ionic Liquid‐Based Gemini Surfactants and Their Interaction with Biomacromolecules

Zhou, Ting; Xu, Guiying

doi:10.1002/9781118854501.ch6

Cited by 2 publications

(3 citation statements)

References 95 publications

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“…53 The β values of gemini surfactants indicate the amount of counterions present in the Stern layer of micelles to counterbalance the electrostatic force that oppose micelle formation. 54 The β values of the morpholinium gemini surfactant under investigation decrease with increase in hydrophobic tail length. Similar trend had been previously reported for the polar group containing thioether-functionalized gemini pyridinium surfactants, 55 hydroxyl-functionalized gemini pyridinium surfactants, 38 ether-functionalized gemini pyridinium surfactants, 14 amide-functionalized quaternary ammonium gemini surfactants, 37 and ester-functionalized gemini piperidinium surfactants, 26 while no specific trend was observed for gemini imidazolium surfactants.…”

Section: Resultsmentioning

confidence: 99%

“…The degree of counterion binding (β) which represents the bromide counterions associated with the micelles in aqueous solution is calculated from the slope values of the region before and after the cmc values, observed in the conductivity plot . The β values of gemini surfactants indicate the amount of counterions present in the Stern layer of micelles to counterbalance the electrostatic force that oppose micelle formation . The β values of the morpholinium gemini surfactant under investigation decrease with increase in hydrophobic tail length.…”

Section: Resultsmentioning

confidence: 99%

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Physicochemical Evaluation of Micellar Solution and Lyotropic Phases Formed by Self-Assembled Aggregates of Morpholinium Geminis

et al. 2017

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The micellar solution and the lyotropic liquid crystalline phases formed by gemini surfactants containing morpholinium headgroups are investigated for their self-aggregation and physicochemical properties in water. These gemini surfactants demonstrated good surface activity because they are able to undergo micellization at lower concentration and form nanosized micellar aggregates in dilute aqueous solution. The binary mixture of the morpholinium gemini surfactant–water system is investigated over a wide range of concentrations. The micellar solution of the morpholinium gemini surfactants demonstrated Newtonian fluidlike behavior between 10 and 50 wt % as the observed viscosities were independent of the applied shear rate. At higher concentration, morpholinium geminis formed self-assembled lyotropic phases in water. These liquid crystalline phases were characterized by small-angle X-ray scattering and polarized optical microscopy techniques.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Physicochemical Evaluation of Micellar Solution and Lyotropic Phases Formed by Self-Assembled Aggregates of Morpholinium Geminis

et al. 2017

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“…This result was interesting as the only difference between IL1 and IL2 is the number of carbon atoms in the alkyl spacer group (8 and 10, respectively). An increase in chain length has been shown to increase hydrophobic interactions between the alkyl chains of IL molecules [48]. Thus, a greater amount of the more hydrophobic IL2 was retained on the surface in PBS in comparison to IL1 after 1 h of immersion.…”

Section: Discussionmentioning

confidence: 99%

Corrosion and Wear Performance of Titanium and Cobalt Chromium Molybdenum Alloys Coated with Dicationic Imidazolium-Based Ionic Liquids

2016

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The present work investigates the corrosion and wear performance of titanium (Ti6Al4V) and cobalt chromium molybdenum (Co28Cr6Mo) alloys when coated with dicationic imidazolium-based ionic liquids (ILs). As novel, multi-functional compounds, ILs were assessed in terms of coating stability and ability to enhance corrosion resistance and mitigate wear. The IL with the amino acid, phenylalanine, as the anionic moiety was found to maintain stable coatings on both alloy surfaces in phosphate buffered saline (PBS) at 37°C which lowered corrosion rates in comparison to control specimens. However, ILs with bis(trifluoromethylsulfonyl)imide (NTf 2) as the anion were found to form unstable coatings on both alloy surfaces that eventually dissolved into PBS, resulting in corrosion behavior similar to or worse than that exhibited by control specimens. Although all IL-coated alloy surfaces exhibited lower coefficient of friction (COF) values and smaller wear scars relative to control specimens lubricated with PBS, the IL with phenylalanine occasionally underwent coating exhaustion and was slower to reach stable COF values. Overall, the anionic moiety and alkyl chain length of an IL were observed as key properties that influence adsorption onto a given substrate which in turn influence its performance as an anti-corrosive agent and lubricant. This study highlights the need for careful selection of ILs based on their chemical structure and nature of the coating substrate (i.e., surface functional groups) in order to form protective films on biomedical alloys that can improve their corrosion and wear resistance.

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Aggregation Behavior of Ionic Liquid‐Based Gemini Surfactants and Their Interaction with Biomacromolecules

Cited by 2 publications

References 95 publications

Physicochemical Evaluation of Micellar Solution and Lyotropic Phases Formed by Self-Assembled Aggregates of Morpholinium Geminis

Physicochemical Evaluation of Micellar Solution and Lyotropic Phases Formed by Self-Assembled Aggregates of Morpholinium Geminis

Corrosion and Wear Performance of Titanium and Cobalt Chromium Molybdenum Alloys Coated with Dicationic Imidazolium-Based Ionic Liquids

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