Stability of the dispersed system in inverse emulsion polymerization of ionic acrylate monomers

Nechaev, A. I.; Voronina, Natalia S.; Вальцифер, В. А.; Стрельников, В. Н.

doi:10.1007/s00396-021-04832-7

Cited by 12 publications

(7 citation statements)

References 30 publications

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“…Due to instability of colloidal system, the DLS measurements were not carried out for the microgels with surfactant content less than 3 wt%. Our result is consistent with dependence of Z average diameter of inverse emulsion particles as a function of surfactant content 22 …”

Section: Resultssupporting

confidence: 91%

“…To evaluate the influence of surfactants HLB on the particle size of AAm 80 ‐APTAC 10 ‐AMPS 10 microgels, the mixture of nonionic surfactants (SPAN80 and TWEEN80) was chosen as an emulsifier 22 . The SPAN80 with an HLB value of 4.3 was used as the main component and TWEEN80 with an HLB value of 15 as a co‐surfactant.…”

Section: Resultsmentioning

confidence: 99%

“…To evaluate the influence of surfactants HLB on the particle size of AAm 80 -APTAC 10 -AMPS 10 microgels, the mixture of nonionic surfactants (SPAN80 and TWEEN80) was chosen as an emulsifier. 22 The SPAN80 with an HLB value of 4.3 was used as the main component and TWEEN80 with an HLB value of 15 as a co-surfactant. Since both SPAN80 and TWEEN80 belong to monooleates the compatibility and synergistic effect of their mixture is highest compared to other surfactants.…”

Section: Permeability Darcymentioning

confidence: 99%

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Amphoteric nano‐ and microgels with acrylamide backbone for potential application in oil recovery

Ayazbayeva,

Baddam,

Shakhvorostov

et al. 2023

Polymers for Advanced Techs

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Amphoteric nano‐ and microgels based on acrylamide (AAm), 3‐acrylamidopropyltrimethylammonium chloride (APTAC) and 2‐acrylamido‐2‐propanesulfonate sodium salt (AMPS) were prepared via inverse emulsion polymerization in the presence of crosslinking agent—N,N′‐methylenebisacrylamide (MBAA). Several polyampholyte nano‐ and microgel samples AAm‐APTAC‐AMPS with compositions (70:15:15, 80:10:10, and 90:5:5 mol%) were obtained and they were abbreviated as AAm70‐APTAC15‐AMPS15, AAm80‐APTAC10‐AMPS10 AAm90‐APTAC5‐AMPS5 (where the lower indexes indicate the molar concentration of monomers). The nano‐ and microgels were characterized by Fourier‐transform infrared spectroscopy, dynamic light scattering (DLS), transmission electron microscope (TEM), thermogravimetric analysis and interfacial tension measurements. The most attention was paid to the AAm80‐APTAC10‐AMPS10 microgel because its linear analog showed the best swelling capacity and the viscosifying effect for potential application in oil recovery. The influence of monomer concentration, surfactants, volume ratio of the water/organic phases, and the hydrophilic–lyophilic balance (HLB) on the average hydrodynamic size of the AAm80‐APTAC10‐AMPS10 nano‐ and microgels was studied. The size distribution of nano‐ and microgels derived from DLS data and TEM images was compared as a function of monomer concentration at constant surfactant concentration (6 wt%), HLB = 5.5 and mixture of water:oil = 60:40 vol%. Swelling of microgel particles in saline water due to the antipolyelectrolyte effect was observed. The applicability of amphoteric microgels AAm80‐APTAC10‐AMPS10 for oil recovery was tested on cores simulating the conditions of a model oil reservoir. The obtained results indicated that after the injection of around three pore volumes of the 2500 ppm microgel suspension into the sandstone core the permeability to brine decreased from 1.5 to 0.78 mD. For the first half of core sample the residual resistance factor was higher than the resistance factor, whereas for the second part of core sample these parameters were almost equal. Additional experiments with longer cores are needed to evaluate in‐depth propagation of microgels and permeability reduction in porous media.

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Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Section: Permeability Darcymentioning

confidence: 99%

See 1 more Smart Citation

Amphoteric nano‐ and microgels with acrylamide backbone for potential application in oil recovery

Ayazbayeva,

Baddam,

Shakhvorostov

et al. 2023

Polymers for Advanced Techs

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show abstract

“…The hydrophilic-lipophilic balance (HLB) value of Tween 80 is 15, and for Span 80 is 4.3. A system with a required HLB value was created by mixing different concentrations of them to get an O\W emulsion easily [ 30 ].…”

Section: Discussionmentioning

confidence: 99%

Antibacterial and Anti-Acne Activity of Benzoyl Peroxide Nanoparticles Incorporated in Lemongrass Oil Nanoemulgel

Eid

Naseef

Jaradat

et al. 2023

Gels

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Purpose: The goal of this study was to make Benzoyl Peroxide (BPO) nanoemulgel to improve its ability to kill bacteria. BPO has trouble getting into the skin, being absorbed by the skin, staying stable, and being spread out. Methods: A BPO nanoemulgel formulation was prepared by combining BPO nanoemulsion with Carbopol hydrogel. The drug was tested for solubility in various oils and surfactants in order to select the best oil and surfactant for the drug, and then the drug nanoemulsion formulation was prepared using a self-nano-emulsifying technique with Tween 80, Span 80, and lemongrass oil. The drug nanoemulgel was looked at in terms of its particle size, polydispersity index (PDI), rheological behavior, drug release, and antimicrobial activity. Results: Based on the solubility test results, lemongrass oil was the best solubilizing oil for drugs, while Tween 80 and Span 80 demonstrated the highest solubilizing ability for drugs among the surfactants. The optimum self-nano-emulsifying formulation had particle sizes of less than 200 nm and a PDI of close to zero. The results showed that incorporating the SNEDDS formulation of the drug with Carbopol at various concentrations did not cause a significant change in the particle size and PDI of the drug. The zeta potential results for drug nanoemulgel were negative, with more than 30 mV. All nanoemulgel formulations exhibited pseudo-plastic behavior, with 0.4% Carbopol exhibiting the highest release pattern. The drug nanoemulgel formulation worked better against bacteria and acne than the product on the market. Conclusion: Nanoemulgel is a promising way to deliver BPO because it makes the drug more stable and increases its ability to kill bacteria.

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“…As shown in Figure 2a, the peaks at 8.26 and 7.18 ppm can be assigned to the protons of amides in AMPS and NIPAM in the representative 1 H NMR spectra of PAMPS 10 and PAMPS 10 -b-PNIPAM 90 , respectively. 35,36 Additionally, the peak at 3.84 ppm can be attributed to the methine proton of NIPAM. 35 Similar results were also observed for other PAMPS-b-PNIPAM diblock copolymers (Figures S6−S9).…”

mentioning

confidence: 99%

p–n Conversion of Thermogalvanic Cells by Harnessing the Micellization of Thermoresponsive Diblock Copolymers

Shen,

Wu,

Hua

et al. 2023

ACS Appl. Energy Mater.

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Thermoelectric energy conversion based on the Seebeck effect holds great potential for effectively mitigating economic and environmental impacts. In contrast to conventional solid semiconductor thermoelectric cells, liquid thermogalvanic cells (TGC) have 1 order of magnitude higher thermopower of approx. 1 mV K–1. However, very limited redox pairs were reported to generate outstanding thermopowers for TGCs. Therefore, achieving n–p or p–n conversion for expanding redox couples is highly promising to resolve the challenge for TGCs. Herein, the p–n conversion of the I–/I3 – TGC with high thermopowers was accomplished by employing easily prepared and scalable thermoresponsive diblock copolymers. By combining the distinct anion–polymer interaction and the micellization of the diblock copolymer, variable concentrations of ions invert the redox reactions at hot and cold sides. As a result, the efficient p–n conversion and enhanced power conversion efficiency was achieved for the I–/I3 – TGC with the introduction of copolymers. Building on the different ion–polymer interactions, the strategy developed in this work is also highly expected to extend to other electrochemical processes and applications.

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Stability of the dispersed system in inverse emulsion polymerization of ionic acrylate monomers

Cited by 12 publications

References 30 publications

Amphoteric nano‐ and microgels with acrylamide backbone for potential application in oil recovery

Amphoteric nano‐ and microgels with acrylamide backbone for potential application in oil recovery

Antibacterial and Anti-Acne Activity of Benzoyl Peroxide Nanoparticles Incorporated in Lemongrass Oil Nanoemulgel

p–n Conversion of Thermogalvanic Cells by Harnessing the Micellization of Thermoresponsive Diblock Copolymers

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