Wavelet transform associated with linear canonical Hankel transform

Kumar, Tanuj; Mandal, U. K.

doi:10.1002/mma.5576

Cited by 16 publications

(13 citation statements)

References 25 publications

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“…The unique chemical structure of surfactants enables them to form a variety of self-assembled structures including monolayers at the air-water interface and micelles, vesicles and bilayers in solution. The ability to form these complex nanostructures allows surfactants to be used in the production of novel pharmaceutical, food and personal care products, material recovery processes, and environmental remediation [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] . In all of these applications, the hydrophobic interior of the aggregate structures can be used to solubilise other slightly soluble nonpolar substances.…”

Section: Introductionmentioning

confidence: 99%

Interaction of testosterone-based compounds with dodecyl sulphate monolayers at the air–water interface

Allen

Damestani

Saaka

et al. 2018

Phys. Chem. Chem. Phys.

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A series of atomistic molecular dynamics simulations were performed for investigating the interactions between three different testosterone-based compounds (testosterone (T), testosterone propionate (TP) and testosterone enanthate (TE)) and sodium dodecyl sulphate (SDS) and ammonium dodecyl sulphate (ADS) monolayers, which vary only in the sodium or ammonium counterions used to neutralise the sulphate headgroup. These simulations were used to investigate how the structural and interfacial properties of the monolayer were affected by changing the number of drug molecules present per monolayer, and the chemical nature of the surfactant counterions and the testosterone-based compounds. Our results show that the structure of the interfacial water layer is affected by the change of the counterion but not the chemistry of the drug molecules. As a result of the difference in their chemical structure, the T, TP and TE drug molecules prefer different locations and orientations within the monolayers. Finally, we observed that the hydration of the drug molecules encapsulated within the ADS monolayers is significantly less than when they are encapsulated within the SDS monolayers. Understanding the role that the counterion and the chemistry of the drug molecules play in these systems provides us with a detailed description of the interactions that cause ADS micelles to encapsulate significantly less drug molecules than SDS micelles, which we have recently observed experimentally.

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Section: Introductionmentioning

confidence: 99%

Interaction of testosterone-based compounds with dodecyl sulphate monolayers at the air–water interface

Allen

Damestani

Saaka

et al. 2018

Phys. Chem. Chem. Phys.

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“…13,14 However, foam is a kind of instable thermodynamic system, and especially CO 2 foam is difficult to generate and less stable than N 2 foams due to relatively high solubility of CO 2 in water, which poses a great challenges to select CO 2 foaming agents. 15 Reservoirs with temperature up to 160 C and formation water salinity over 100 000 ppm are confronted in many oilelds over the world, so there is a practical industrial need to develop stable CO 2 foams for their application at high temperature and high pressure (HTHP) conditions. 16 The most commonly method for improving foam stability is addition of the so-called foam stabilizers to foam agent solutions.…”

Section: Introductionmentioning

confidence: 99%

Enhanced stability and high temperature-tolerance of CO₂ foam based on a long-chain viscoelastic surfactant for CO₂ foam flooding

et al. 2019

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“…6,15−18 The selection of the surfactant to be used depends on the reservoir conditions mentioned above. 3,16,17 In applications where it is required that the surfactant adsorbs onto the solid surface, the most common approach is to take advantage of the strong electrostatic interaction that can be established between the polar heads of the surfactants and the excess surface charge on the solid. 16 typically used for the treatment of carbonate formations 12,19−21 and cationic surfactants for the treatment of sandstones.…”

Section: ■ Introductionmentioning

confidence: 99%

Chemical Alteration of Wettability of Sandstones with Polysorbate 80. Experimental and Molecular Dynamics Study

2017

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In this work experimental and theoretical evaluations of the wettability alteration of sandstones, using the commercial surfactant polysorbate 80 (P80), are presented. The experimental evaluation started from a virgin sandstone core (water-wet); damage was then induced to modify the wettability of the rock from water-wet to oil-wet, with the purpose of evaluating the surfactant’s ability to restore the wettability of the core to the water phase. The contact angles of water and n-decane droplets were used to evaluate the wettability alteration of the surface. The theoretical evaluation was made using molecular dynamics to determine the configuration of the surfactant adsorbed on the surface and to calculate the surfactant–liquid interaction energy. Experimental results showed that a concentration of 100 ppm P80 in the impregnation solution generated the greatest contact angle for n-decane droplets and a small contact angle for water droplets using the least amount of surfactant, restoring the water-wet state of the solid and generating a lipophobic surface. The molecular dynamics results showed that adsorption of the surfactant on the surface is associated mainly with interactions between the chains of the surfactant that contain the ester group and the surface, whereas the chains containing ethylene oxides are exposed toward the liquid phase. By evaluating the interaction energy between the P80 coating and the liquid phases, it was established that the chains containing the ethylene oxides were key to restoring the water-wet state of the surface since they exerted an attractive interaction over water and a slightly repulsive interaction over n-decane, generating the lipophobic surface. The molecular model developed in this work allows the performance of predictive calculations of the contact angle of liquid droplets, with deviations, in most cases, of less than 5% compared to the experimental value.

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Wavelet transform associated with linear canonical Hankel transform

Cited by 16 publications

References 25 publications

Interaction of testosterone-based compounds with dodecyl sulphate monolayers at the air–water interface

Interaction of testosterone-based compounds with dodecyl sulphate monolayers at the air–water interface

Enhanced stability and high temperature-tolerance of CO₂ foam based on a long-chain viscoelastic surfactant for CO₂ foam flooding

Chemical Alteration of Wettability of Sandstones with Polysorbate 80. Experimental and Molecular Dynamics Study

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Wavelet transform associated with linear canonical Hankel transform

Cited by 16 publications

References 25 publications

Interaction of testosterone-based compounds with dodecyl sulphate monolayers at the air–water interface

Interaction of testosterone-based compounds with dodecyl sulphate monolayers at the air–water interface

Enhanced stability and high temperature-tolerance of CO2 foam based on a long-chain viscoelastic surfactant for CO2 foam flooding

Chemical Alteration of Wettability of Sandstones with Polysorbate 80. Experimental and Molecular Dynamics Study

Contact Info

Product

Resources

About

Enhanced stability and high temperature-tolerance of CO₂ foam based on a long-chain viscoelastic surfactant for CO₂ foam flooding