Studies on the surface and thermodynamic properties of some surfactants in aqueous and water+1,4-dioxane solutions

Ananda, K; Yadav, Om Prakash; Singh, Prayas

doi:10.1016/0166-6622(91)80104-v

Cited by 80 publications

(39 citation statements)

References 10 publications

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“…This is due to progressive charge shielding and closer packing of the drug ions in the surface. The low values of A min suggest that the orientation of the surfactant molecule at the interface is almost perpendicular to the interface (Anand et al, 1991). The values of A min for the drug are similar to those reported for other antidepressants ) and phenothiazines (Zografi & Zarenda, 1966).…”

Section: Wwwintechopencomsupporting

confidence: 66%

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Thermodynamics of Amphiphilic Drug Imipramine Hydrochloride in Presence of Additives

Alam¹,

Mandal²,

Mandal³

2011

Thermodynamics - Systems in Equilibrium and Non-Equilibrium

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Section: Wwwintechopencomsupporting

confidence: 66%

“…Thus, n has a value of 2 in water and approaches 1 in the presence of excess inert electrolyte. The slope of the tangent at the given concentration of the vs log c plot was used to calculate max , and A min was evaluated using the relation (Anand et al, 1991)…”

Section: Micellization 311 Surface Tension Measurementsmentioning

confidence: 99%

Thermodynamics of Amphiphilic Drug Imipramine Hydrochloride in Presence of Additives

Alam¹,

Mandal²,

Mandal³

2011

Thermodynamics - Systems in Equilibrium and Non-Equilibrium

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“…The A min area decrease with increasing additive concentration (Table 1) takes place due to progressive charge shielding and closer packing of the gemini surfactant ions at the surface. This result suggests that the orientation of the gemini surfactant molecules at the interface is almost perpendicular to the interface [37]. Whereas U max decreases with increasing the spacer length, both in the absence and presence of amines, the A min followed a reverse order, i.e., 16-6-16 [ 16-5-16 [ 16-4-16 [36].…”

Section: Resultsmentioning

confidence: 98%

Mixed Micellization of Cationic Gemini Surfactants with Primary Linear Alkylamines

Khan

Mohammad

Alam

et al. 2009

J Surfact & Detergents

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Due to the potential use of amines as co-surfactants in microemulsions, the effect of adding alkylamines (C 4 -C 8 NH 2 ) on the aggregation properties of cationic gemini surfactants [pentanediyl-1, 5-bis(dimethylcetylammonium bromide) and hexanediyl-1, 6-bis(dimethylcetylammonium bromide), referred to as 16-5-16 and 16-6-16 compounds] has been studied using tensiometry at 303 K. Data on critical micelle concentration (CMC), the surface properties C 20 (the surfactant concentration required to reduce the surface tension by 20 mN/m), U max (maximum surface excess), A min (minimum surface area per molecule) evaluated from the surface tension versus surfactant concentration plot, the interaction parameters b r (for mixed monolayer formation at the aqueous solution/air interface), and b m (for mixed micelle formation in aqueous medium) are reported. A synergistic interaction was observed both in the micelle as well as at interface, as evident from interaction parameters. Theoretical models of Clint, Rubingh and Rosen were used to explain and compare the results. More synergistic interaction was observed in 16-5-16 as compared to 16-6-16. The CMC values of 16-s-16 (s = 5, 6) decreased with increasing amine concentrations and the extent of the effect followed the sequence: octylamine [ heptylamine [ hexylamine [ pentylamine [ butylamine.

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“…The adsorption of QACs with chain lengths greater than a critical value-eight carbons-such as DTAB takes place via cationic exchange and hydrophobic bonding. It has a critical micellization concentration (CMC) of 1.6 x 10 -2 mol.dm -3 at 25°C (Ananda et al, 1991;Huang et al, 1989). The 88% technical grade chemical was supplied by Acros organics and was used without further purification.…”

Section: Shale-fluid Interaction Aqueous Environmentmentioning

confidence: 99%

Rock/Fluid Chemistry Impacts on Shale Fracture Behavior

Aderibigbe

Lane

2013

SPE International Symposium on Oilfield Chemistry

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At realistic surfactant concentrations used in fracturing fluid additives, the differences in the average strengths of shale exposed to solutions of these additives are not sufficient to establish a direct correlation between the chemical effect of the surfactants and the mechanical strength of the formation. Prior studies of formations with high quartz content suggest that the adsorption of surfactant on the surface alters formation strength. In this study, using Mancos shale samples, the rock mineralogy, total organic carbon and cation exchange capacity of the Mancos shale samples were determined in order to characterize the shale. Adsorption tests to study the interaction of the shale and aqueous fluid mixture were also carried out using surface tension measurements. The uniaxial compressive strengths and indirect tensile strengths of about 100 rock samples exposed to different fluid environments were measured using unconfined compression and Brazilian tests respectively. Microseismic events, possibly due to microfracture generation or growth, are known to continue for some time as stresses relax after shutdown of hydraulic fracture pumps. Hence, the study of the role of surface chemical effects in compression and tensile fracturing is important in determining whether rock/fluid chemistry can be exploited to improve the growth of conductive microfractures.

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Studies on the surface and thermodynamic properties of some surfactants in aqueous and water+1,4-dioxane solutions

Cited by 80 publications

References 10 publications

Thermodynamics of Amphiphilic Drug Imipramine Hydrochloride in Presence of Additives

Thermodynamics of Amphiphilic Drug Imipramine Hydrochloride in Presence of Additives

Mixed Micellization of Cationic Gemini Surfactants with Primary Linear Alkylamines

Rock/Fluid Chemistry Impacts on Shale Fracture Behavior

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