Turbidity and viscosity measurements on some cationic detergents in water and in sodium chloride solutions

Abstract

LiQ'ht-scatterin g a nd viscosity m easurem e nts were made on solu tions o f thr ee catio ni c d eterge~lt~ in di s tilled water and ill var ious solutions of sod iu m chlorid e. The d cterp;ents 'YC1'e dodeeyla mill e hydrochloride, dodecy lt l"lll1 l'th.v la Il1ll10 nlulll chlo l"ld e, a nd tctmdecyltr im ethvlanlmo lliul11 chl ori de. The fi r st of these \\'as investigated at 30° C a nd t he othe rs at 23° C. The mi cell ar we ig ht a nd t he in t rin sic viscosity of t he micelles of eaell detergent \\'ere calc ulated, a nd t he d epe nde nce of tiWSl' quantities on t he concentration o f sod ium c hl oride is d iscusspd .

Bisimidazoacridones: Effect of Molecular Environment on Conformation and Photophysical Properties

“…4 as a ratio of plateau value vs initial value, normalized according to Eq. 3 tThe estimation was made on the basis of data for related compounds (15). of the fluorescence intensities of BIA solutions in water and nonaqueous media (determined from the data of Table 1).…”

Effect of NaCl on Aggregation Number, Microviscosity, and Cmc ofN-Dodecanoyl Amino Acid Surfactant Micelles

“…slightly with increasing concentration of salt at low salt concentration, followed by a steep increase at the critical salt In order to understand such behavior in microviscosity, the state of molecular motion at the solubilized site (micelle concentration (28,29,(31)(32)(33)(34)(35)(36). The aggregation number of sodium dodecyl sulfate (SDS) remained constant below a surface) of the probe should be taken into account.…”

SANS and light scattering of nonylammonium chloride micelles in aqueous solutions of sodium chloride

“…ionic strength increases. This behaviour is less pronounced than that found for the homologue of NAC with eleven and twelve [1,16] carbon atoms in the hydrocarbon chain. Micelles of these surfactants in the presence of NaC1 at relatively low concentration of this salt show a pronounced increase in the aggregation number with increasing the NaC1 concentration.…”

“…The electrostatic free energy was calculated by applying the Gouy-Chapman theory, according to which the electrostatic free energy per mole of amphiphile will be given by where ro is the radius of the micellar core and v = (27.4 + 26.9 n)/~ s is the volume of the amphiphilic tail [14], n being the number of methyl plus methylene groups per hydrocarbon tail 4=r~ (16) Alg -, g where rg ( = ro + 8) is the micelle radius at a distance ~ from the hydrophobic core in which the charge is located. F o r the ammonium group ~ is 0.7/~.…”