Effect of Counterions and Temperature on the Association and Partition Balances of Hexadecylpyridinium Halides in Aqueous Solutions
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J. Oremusová
Abstract
The effect of counterions and temperature on the association (critical micelle concentration, thermodynamics of micellization) and partition balances (experimental partition coefficient) of three quarternary ammonium surfactants (CPX) having a common hexadecylpyridinium cation and different anions (chloride, bromide, iodide) were studied in aqueous solutions at the temperature range 20–50°C, using conductometry, potentiometry, UV spectroscopy and measurement of surface tension. All methods used gave closely similar values for critical micelle concentration. From calculated thermodynamics parameters the process of micellization was found to be spontaneous and exothermic. Experimental partition coefficient of hexadecylpyridinium halides increased from chloride to iodide.
The objective of this work was to check whether surfactant counterions can affect the micellization and partition processes. From the results obtained it seems that the differences found in micellization and partitioning of all compounds studied, may be attributed to the different physicochemical properties of chloride, bromide and iodide anions as their differences in mobility etc.
Kurzfassung
Der Einfluss von Gegenionen und Temperatur auf die Assoziation (kritische Mizellbildungskonzentration, Thermodynamik der Mizellenbildung) und Verteilungsgleichgewichte (experimenteller Verteilungskoeffizient) von drei quaternären Ammoniumtensiden (CPX), mit einem herkömmlichem Hexadecylpyridinium-Kation und verschiedenen Anionen (Chloride, Bromide, Jodide), wurde in wässrigen Lösungen in einem Temperaturbereich von 20–50°C mittels Konduktometrie, Potentiometrie, UV-Spektroskopie und Messung der Oberflächenspannung untersucht. Alle verwendeten Methoden ergaben nahezu ähnliche Werte für die kritische Mizellbildungskonzentration. Aus den berechneten thermodynamischen Parametern wurde ein spontaner und exothermer Prozess der Mizellenbildung gefunden. Der experimentelle Verteilungskoeffizient von Hexadecylpyridiniumhalogeniden steigt vom Chlorid zum Jodid hin an.
Das Ziel dieser Arbeit war es zu überprüfen, ob Tensidgegenionen die Mizellenbildung und den Verteilungsprozeß beeinflussen können. Anhand der erhaltenen Ergebnisse sieht es so aus, als ob die gefundenen Unterschiede in der Mizellenbildung und Partitionierung aller untersuchten Verbindungen den verschiedenen physikalisch chemischen Eigenschaften von Chlorid-, Bro-mid- und Jodidanion, wie ihre Unterschiede in der Beweglichkeit etc., zugeordnet werden können.
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© 2005, Carl Hanser Publisher, Munich
Artikel in diesem Heft
- Contents/Inhalt
- Contents
- Abstracts
- Abstracts
- Analysis
- Ultrasonic Extraction and TLC Determination of Surfactants in Laundry Wastewaters
- Environmental Chemistry
- Rapeseed Methyl Ester Ethoxylates: A New Class of Surfactants of Environmental and Commercial Interest
- Physical Chemistry
- Effect of Counterions and Temperature on the Association and Partition Balances of Hexadecylpyridinium Halides in Aqueous Solutions
- Study of the Cloud Point of C12 E6 Nonionic Surfactant: Effect of Additives
- Oxo-Alcohol Ethoxylates: Surface and Thermodynamic Properties and Effect of Various Additives on the Cloud Point
- Revision of the Adsorption Behavior of the Non-ionic Surfactant Tetraoxyethylene Decylether C10 E4 at the Water/Air Interface
- Synthesis
- Synthesis and Surfactant Properties of Triethanolammonium Salts of N-Acylated N-Carboxyethylglycine
Artikel in diesem Heft
- Contents/Inhalt
- Contents
- Abstracts
- Abstracts
- Analysis
- Ultrasonic Extraction and TLC Determination of Surfactants in Laundry Wastewaters
- Environmental Chemistry
- Rapeseed Methyl Ester Ethoxylates: A New Class of Surfactants of Environmental and Commercial Interest
- Physical Chemistry
- Effect of Counterions and Temperature on the Association and Partition Balances of Hexadecylpyridinium Halides in Aqueous Solutions
- Study of the Cloud Point of C12 E6 Nonionic Surfactant: Effect of Additives
- Oxo-Alcohol Ethoxylates: Surface and Thermodynamic Properties and Effect of Various Additives on the Cloud Point
- Revision of the Adsorption Behavior of the Non-ionic Surfactant Tetraoxyethylene Decylether C10 E4 at the Water/Air Interface
- Synthesis
- Synthesis and Surfactant Properties of Triethanolammonium Salts of N-Acylated N-Carboxyethylglycine
