2015
DOI: 10.1007/s10953-014-0284-y
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Conductometric Studies on Micellization of Cationic Surfactants in the Presence of Glycine

Abstract: Values of the critical micelle concentration (cmc) and degree of counterion dissociation (a) of four cationic surfactants: cetyltrimethylammonium bromide (CTAB), cetylpyridinium bromide (CPB), cetylpyridinium chloride (CPC) and benzyldimethylhexadecylammonium chloride (BDHAC) in aqueous-glycine medium (concentration of glycine (Gly) varied from 0 to 0.20 molÁdm -3 ) were determined through conductometric measurements at 303 K. The effect of temperature on the micellization in the presence of 0.10 molÁdm -3 Gly… Show more

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Cited by 27 publications
(12 citation statements)
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References 31 publications
(32 reference statements)
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“…As opposed to the reported CMC values for pure CTAB and SDS, [ 44,47–49 ] the values of CMC for the CTAB + MNH and MNH + SDS systems in pure water were observed to be lower in magnitude. The CMC values for pure CTAB were reported as in the range of 0.99–1.23 mM at 303.15 K, [ 47,48,50 ] and the CMC for pure SDS at 303.1 K was of 8.10 mmol L −1 using conductivity technique.…”
Section: Resultscontrasting
confidence: 80%
“…As opposed to the reported CMC values for pure CTAB and SDS, [ 44,47–49 ] the values of CMC for the CTAB + MNH and MNH + SDS systems in pure water were observed to be lower in magnitude. The CMC values for pure CTAB were reported as in the range of 0.99–1.23 mM at 303.15 K, [ 47,48,50 ] and the CMC for pure SDS at 303.1 K was of 8.10 mmol L −1 using conductivity technique.…”
Section: Resultscontrasting
confidence: 80%
“…The observed cmc values of CTAB in the presence of aqueous ascorbic acid solution were found to be lower as compared to the cmc values of CTAB in pure water. The similar results have been observed and reported for CTAB in the presence of glycine (Koya et al 2015). The cmc of CTAB in water is decreased in the presence of ascorbic acid as it increases screening by means of electrostatic interaction between head groups (positively charged) of the surfactant molecules, in turn the micelle formation results at lower concentration with the energetically favorable aggregate structures.…”
Section: Role Of Ctabsupporting
confidence: 88%
“…The increase or decrease in the CMC values also depends on the various interactions operating between the monomers. In the presence of glycine, the equilibrium established between the water molecules and CPZ / CTAB changes, and as a result there are changes in the specific interactions: (i) ion‐zwitterion interactions between Br − /N + − CH 3 group of CTAB, + NH(CH 3 ) 2 /Cl − group of CPZ, and NH 3 + /COO − group of glycine or the repulsive interactions between the similarly charged species and; (ii) hydrophobic‐hydrophobic interactions between alkyl (R = C 16 H 33 ) chain of CTAB or hydrophobic tricyclic scaffolding of CPZ and hydrophobic, −CH 2 group of glycine (Koya et al, 2015). The increase in CMC values of CPZ may be due to an increase in repulsive interactions (type (i) predominates) between ions which oppose their association and thus disfavor the micellization process.…”
Section: Resultsmentioning
confidence: 99%
“…Glycine is a structure breaking amino acid (Koya et al, 2015) so its presence will decrease the solubility of hydrocarbon tail i.e ., alkyl (R = C 16 H 33 ) chain of CTAB and will cause an increase in the interfacial tension between the micelles and aqueous solvent. As a result, the micellization will be facilitated and there will be a decrease in the CMC of CTAB with respect to increase in concentration of glycine.…”
Section: Resultsmentioning
confidence: 99%
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