A pH-triggered reinforcement of transient network of wormlike micelles by halloysite nanotubes of different charge

Shishkhanova, Kamilla B.; Молчанов, В.С.; Baranov, A.N.; Kharitonova, Elena P.; Orekhov, Anton S.; Архарова, Н. А.; Philippova, Olga E.

doi:10.1016/j.molliq.2022.121032

Cited by 10 publications

(2 citation statements)

References 65 publications

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“…These features are characterized by highly entangled WLM networks of EHAC [37]. Rheological properties only slightly depend on pH, which is common for cationic surfactants with quaternary ammonium polar heads since they are not pH-sensitive [39]. Salicylic acid has a pK a value of ca.…”

Section: Resultsmentioning

confidence: 99%

Dual Semi-Interpenetrating Networks of Water-Soluble Macromolecules and Supramolecular Polymer-like Chains: The Role of Component Interactions

Makarova,

Kwiatkowski,

Kuklin

et al. 2024

Polymers

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Dual networks formed by entangled polymer chains and wormlike surfactant micelles have attracted increasing interest in their application as thickeners in various fields since they combine the advantages of both polymer- and surfactant-based fluids. In particular, such polymer-surfactant mixtures are of great interest as novel hydraulic fracturing fluids with enhanced properties. In this study, we demonstrated the effect of the chemical composition of an uncharged polymer poly(vinyl alcohol) (PVA) and pH on the rheological properties and structure of its mixtures with a cationic surfactant erucyl bis(hydroxyethyl)methylammonium chloride already exploited in fracturing operations. Using a combination of several complementary techniques (rheometry, cryo-transmission electron microscopy, small-angle neutron scattering, and nuclear magnetic resonance spectroscopy), we showed that a small number of residual acetate groups (2–12.7 mol%) in PVA could significantly reduce the viscosity of the mixed system. This result was attributed to the incorporation of acetate groups in the corona of the micellar aggregates, decreasing the molecular packing parameter and thereby inducing the shortening of worm-like micelles. When these groups are removed by hydrolysis at a pH higher than 7, viscosity increases by five orders of magnitude due to the growth of worm-like micelles in length. The findings of this study create pathways for the development of dual semi-interpenetrating polymer-micellar networks, which are highly desired by the petroleum industry.

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Section: Resultsmentioning

confidence: 99%

Dual Semi-Interpenetrating Networks of Water-Soluble Macromolecules and Supramolecular Polymer-like Chains: The Role of Component Interactions

Makarova,

Kwiatkowski,

Kuklin

et al. 2024

Polymers

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“…Условия экструзионной печати обычно соответствуют скоростям сдвига 50-100 с -1 [5,14,15]. При добавлении НТ вязкость при малых скоростях растет, что согласуется с увеличением предела текучести за счет дополнительных сшивок альгината с НТ, но при высоких скоростях значения вязкости практически не отличаются от значений для ненаполненного геля, что можно объяснить тем, что эти связи тоже рвутся [28]. Таким образом, показано, что при добавлении НТ сохраняется свойство сильного падения вязкости со скоростью сдвига, а при условиях, соответствующих экструзии, вязкости не изменяются.…”

Section: результаты и обсуждениеunclassified

Rheological behavior of polysaccharide hydrogels of alginate reinforced by small amount of halloysite nanotubes for extrusion 3D printing

Molchanov,

Glukhova,

Philippova

2023

Vestn. Mosk. Univ. Ser. 16. Biol.

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The rheological properties of hydrogels of a natural polysaccharide sodium alginate and small amount of clay nanotubes of halloysite were investigated. Changes of rheological properties during the transition from a semi-dilute polymer solution to a hydrogel upon cross-linking by calcium ions were shown. In the gel state, the samples have a yield stress, and their viscosity decreases with the shear rate, but the properties are quickly recovered after the load removal. It was obtained that the addition of up to 0.3 vol.% nanotubes of natural clay halloysite leads to an increase by several times of a storage modulus and an yield stress of the hydrogels. At the same time, the practically important properties of shear thinning and the rapid recovery of properties after the load removing make the nanocomposite hydrogels of alginate and halloysite nanotubes promising for use as ink for extrusion 3D printing.

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Enhanced magnetic halloysite nanotubes for dye removal at different pH conditions

Nguyen,

Jeong,

Abelmann

et al. 2024

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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A pH-triggered reinforcement of transient network of wormlike micelles by halloysite nanotubes of different charge

Cited by 10 publications

References 65 publications

Dual Semi-Interpenetrating Networks of Water-Soluble Macromolecules and Supramolecular Polymer-like Chains: The Role of Component Interactions

Dual Semi-Interpenetrating Networks of Water-Soluble Macromolecules and Supramolecular Polymer-like Chains: The Role of Component Interactions

Rheological behavior of polysaccharide hydrogels of alginate reinforced by small amount of halloysite nanotubes for extrusion 3D printing

Enhanced magnetic halloysite nanotubes for dye removal at different pH conditions

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