English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

In the present study, the conductometric and dye-solubilization techniques have been utilized to investigate the interaction between an anionic dye (acid yellow 23 [AY]) and a cationic surfactant (cetyltrimethylammonium bromide [CTAB]) in presence of organic (ethanol)/inorganic (NaCl) additives. From the conductometric method, two critical micelle concentrations ( cmc ) were found for AY + CTAB mixture in an aqueous system and the  cmc  values were found to undergo a change with the variation of AY concentrations. The  cmc  values of AY + CTAB systems were observed higher in the alcoholic medium, while the same was found to be lower in the NaCl solutions. The change in  cmc  of AY + CTAB systems shows an U-like curve with an increase of temperature. The negative free energy of micellization (ΔG   m   o${\Delta}{G}_{m}^{o}$) for the AY + CTAB systems has indicated a spontaneous micelle formation in all of the cases studied. The enthalpy (ΔH   m   o${\Delta}{H}_{m}^{o}$), as well as the entropy of micellization (ΔS   m   o${\Delta}{S}_{m}^{o}$) for the AY + CTAB systems, were assessed and discussed with proper reasoning. Additionally, the enthalpy-entropy compensation parameters were also investigated and illustrated. The solubility of AY and  C   D  was observed to rise linearly with an increase in the concentration of CTAB/NaCl solution. The solubilization capacity ( χ ) of AY, the molar partition coefficient ( K   M ) amongst the micellar and the aqueous phase, and free energy of solubilization (ΔG   S   o${\Delta}{G}_{S}^{o}$) were evaluated and discussed in detail. The former parameters undergo an increase with an increase of NaCl concentrations.

zeitschrift für physikalische chemie

Interaction of cationic surfactant with acid yellow dye in absence/presence of organic and inorganic additives: conductivity and dye solubilization methods