Influence of polyethylene glycol on the aggregation/clouding phenomena of cationic and non-ionic surfactants in attendance of electrolytes (NaCl &amp; Na2SO4): An experimental and theoretical analysis

Aktar, Shahina; Saha, Mousumi; Mahbub, Shamim; Halim, Mohammad A.; Rub, Malik Abdul; Hoque, Md. Anamul; Islam, Dipa; Kumar, Dileep; Alghamdi, Yousef G.; Asiri, Abdullah M.

doi:10.1016/j.molliq.2020.112880

Cited by 61 publications

(13 citation statements)

References 67 publications

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“…No Tyndall effect was observed when using these two cationic surfactants, which permitted assessing the effect of higher concentrations. These results agree with the literature on the effect of ionic surfactants on the CPT of copolymers from the ethylene oxide family [23,70,[89][90][91]. Generally, a significant increase on the CPT of watersoluble copolymers is observed after addition of either anionic or cationic surfactants.…”

Section: Effect Of Additives On the Cpt Of Peg-g-pvacsupporting

confidence: 92%

Liquid-liquid phase separated microdomains of an amphiphilic graft copolymer in a surfactant-rich medium

Corrons

Gummel

Smets

et al. 2021

Preprint

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The liquid-liquid phase separation (LLPS) of amphiphilic thermoresponsive copolymers can lead to the formation of micron-sized domains, known as simple coacervates. Due to their potential to confine active principles, these copolymer-rich droplets have gained interest as encapsulating agents. Understanding and controlling the conditions inducing this LLPS is therefore essential for applicative purposes and requires thorough fundamental studies on self-coacervation. In this work, we investigate the LLPS of a comb-like graft copolymer (PEG-g-PVAc) consisting of a poly(ethylene glycol) backbone (6 kDa) with 2-3 grafted poly(vinyl acetate) chains, and a PEG/PVAc weight ratio of 40/60. Specifically, we report the effect of various water-soluble additives on its phase separation behavior. Kosmotropes and non-ionic surfactants were found to decrease the phase separation temperature of the copolymer, while chaotropes and, above all, ionic surfactants increased it. We then focus on the phase behavior of PEG-g-PVAc in the presence of sodium citrate and a C14-15 E7 non-ionic surfactant (N45-7), defining the compositional range for the generation of LLPS microdomains at room temperature and monitoring their formation with fluorescence confocal microscopy. Finally, we determine the composition of the microdomains through confocal Raman microscopy, demonstrating the presence of PEG-g-PVAc, N45-7, and water. These results expand our knowledge on polymeric self-coacervation, clarifying the optimal conditions and composition needed to obtain LLPS microdomains with encapsulation potential at room temperature in surfactant-rich formulations.

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Section: Effect Of Additives On the Cpt Of Peg-g-pvacsupporting

confidence: 92%

Liquid-liquid phase separated microdomains of an amphiphilic graft copolymer in a surfactant-rich medium

Corrons

Gummel

Smets

et al. 2021

Preprint

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“…22−24 The solution behavior was also studied by varying the branching of the hydrophobic and hydrophilic groups of the surfactants in the mixture. 16,25,26 Specifically, the interaction between electrolyte counterions with oppositely charged surfactants is of great importance; this attracts major attention in both academic and commercial applications. These interactions are much more complex than that between ionic and nonionic surfactant mixtures due to the free ion, charge density, and electrical double layer formation along with strong electrostatic interactions.…”

Section: Introductionmentioning

confidence: 99%

“…The solution behavior was also studied by varying the branching of the hydrophobic and hydrophilic groups of the surfactants in the mixture. ,, Specifically, the interaction between electrolyte counterions with oppositely charged surfactants is of great importance; this attracts major attention in both academic and commercial applications. These interactions are much more complex than that between ionic and nonionic surfactant mixtures due to the free ion, charge density, and electrical double layer formation along with strong electrostatic interactions. ,− The presence of electrolytes affects the ionic and nonionic surfactant properties both at the bulk and interface, especially when the POE chain induces variation in the hydration amount and the properties of water structure based on ionic valency and charge density.…”

Section: Introductionmentioning

confidence: 99%

Effect of Electrolytes on Solution and Interfacial Behaviors of Double Chain Cationic–Nonionic Surfactant Mixtures for Hydrophobic Surface Wetting and Oil/Water Emulsion Stability Applications

Banerjee

Paria

2021

Langmuir

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The solution behaviors of the binary mixture of double chain cationic surfactant didodecyldimethylammonium bromide (DDAB) with nonionic surfactants of varied head groups, EO-9 and EO-40, in the presence and absence of electrolytes were studied and found nonideal behavior. The different physicochemical properties such as Gibb’s surface excess (Γ), minimum area per molecule (A min), and interaction parameters at bulk (β M ) and interface (β σ ) were calculated. In the presence of nonionic surfactants, lowering of CMC, CVC, and surface tension at these two concentrations of DDAB were observed. The β M and β σ values indicate strong interaction between DDAB and EO-40 mixed system. Further, addition of electrolytes to the mixed systems show increased interaction and change of physicochemical properties because of the combination of electrical and salting out effects.

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“…Then, κ values of the resultant mixture displayed by conductivity meter were recorded and plotted against corresponding CTAB concentrations to find the cmc. The details method of κ determination was reported in our previous works (Mahbub et al 2019b;2019c;Abedin et al 2021;Aktar et al 2020).…”

Section: Conductivity Measurementmentioning

confidence: 99%

“…The concentration of TX-100 in TX-100 + SCMC mixture was kept above cmc of TX-100 as to maintain TX-100 in a micellar state. The CP measurement procedure for TX-100 + SCMC mixture was carried out following the earlier literature (Aktar et al 2020(Aktar et al , 2018Mahbub, 2020). The solution of TX-100 + SCMC prepared in the desired solvent was heated smoothly until the solution gets cloudy followed by cooling the solution to get a clear solution.…”

Section: Cloud Point Measurementmentioning

confidence: 99%

A conductivity and cloud point investigation of interaction of cationic and non-ionic surfactants with sodium carboxymethyl cellulose: effect of polyols and urea

et al. 2021

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Surfactants and polymers are widely used chemicals in different applied fields like pharmaceutical, textile, food, and cosmetic industries. Therefore, the study of surfactant-polymer interaction can improve their activity in related applied fields. Herein, we studied the interaction of polymer, sodium carboxymethyl cellulose (SCMC) with two surfactants. The interaction of SCMC with cetyltrimethylammonium bromide (CTAB), a cationic surfactant, was assessed through conductivity measurement technique, while the interaction between non-ionic surfactant, Triton X-100 (TX-100) and SCMC was assessed by cloud point (CP) analysis. The effect of different organic additives (glucose, maltose, and urea) on the micellar behavior of the CTAB + SCMC mixture and phase partitioning behavior of TX-100 + SCMC mixture was investigated. The critical micelle concentration (cmc) of the CTAB + SCMC system having 0.3 mmolkg −1 SCMC was augmented linearly as a function of temperature and concentration of organic additives. The cmc values of CTAB + SCMC system increased from 1.28 to 1.44 mmolkg −1 and 1.18 to 1.33 mmolkg −1 with the increase in concentration from 0.1 to 8.0 mmolkg −1 of glucose and maltose, respectively. The extent of counterion binding (β) was obtained to be temperature-dependent. The CP values of TX-100 + SCMC were experienced to be reduced up to a certain concentration of glucose/maltose and then augment with enhancing the concentration of glucose and maltose, while the CP values increased monotonically with the concentration of urea. The Gibbs free energy values indicate the spontaneous micellization of the CTAB + SCMC system and non-spontaneous phase partitioning of the TX-100 + SCMC system. The enthalpy and entropy change as well as their compensation were studied and explained with proper explanation.

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Influence of polyethylene glycol on the aggregation/clouding phenomena of cationic and non-ionic surfactants in attendance of electrolytes (NaCl & Na2SO4): An experimental and theoretical analysis

Cited by 61 publications

References 67 publications

Liquid-liquid phase separated microdomains of an amphiphilic graft copolymer in a surfactant-rich medium

Liquid-liquid phase separated microdomains of an amphiphilic graft copolymer in a surfactant-rich medium

Effect of Electrolytes on Solution and Interfacial Behaviors of Double Chain Cationic–Nonionic Surfactant Mixtures for Hydrophobic Surface Wetting and Oil/Water Emulsion Stability Applications

A conductivity and cloud point investigation of interaction of cationic and non-ionic surfactants with sodium carboxymethyl cellulose: effect of polyols and urea

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