On the rheology of mixed systems of hydrophobically modified polyacrylate microgels and surfactants: Role of the surfactant architecture

Alves, Luís; Lindman, Björn; Klotz, Björn; Böttcher, Axel; Haake, Hans Martin; Antunes, Filipe E.

doi:10.1016/j.jcis.2017.11.047

Cited by 19 publications

(12 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…230 nm. This can be attributed to the excellent affinity of this kind of polymer, amphiphilic polymers, to interact for instance with surfactants [38] and other compounds containing both hydrophilic and hydrophobic domains, as is the case of the sepiolite clays [6,39,40]. In summary, the combination of an adequate dispersing agent with suitable dispersing equipment and suspension pH led to a significant improvement in disaggregation, dispersion, and stability of sepiolite suspensions in aqueous medium.…”

Section: Effect Of the Dispersantsmentioning

confidence: 97%

Improving Colloidal Stability of Sepiolite Suspensions: Effect of the Mechanical Disperser and Chemical Dispersant

et al. 2020

Self Cite

View full text Add to dashboard Cite

To allow the use of fibrous-like clays, as sepiolite, in different applications, their disaggregation and the formation of stable suspensions are crucial steps to enhance their performance significantly, e.g., in cellulose nanofibrils/clay composite formulations, enabling an adequate mixture of the matrix and filler individual components. Three distinct physical treatments of dispersion (magnetic stirring, high-speed shearing, and ultrasonication) and four different chemical dispersants (polyacrylate, polyphosphate, carboxymethylcellulose, and alginate, all in the form of sodium salts) were tested to improve the dispersibility and the formation of stable suspensions of sepiolite. Two sepiolite samples from the same origin but with different pre-treatments were evaluated. The particle size and suspension stability were evaluated by dynamic light scattering, zeta potential measurements and optical microscopy. Additionally, the sepiolite samples were initially characterized for their mineralogical, chemical, and morphologic properties. Of the three physical dispersion treatments tested, the ultrasonicator typically produced more stable suspensions; on the other hand, the biopolymer carboxymethylcellulose showed a higher ability to produce stable suspensions, being, however, a smaller particle size obtained when polyphosphate was used. Remarkably, 47 out of 90 prepared suspensions of sepiolite stayed homogeneous for at least three months after their preparation. In sum, the combination of a high energy dispersing equipment with an appropriate dispersing agent led to stable suspensions with optimal properties to be used in different applications, like in the composite production.

show abstract

Section: Effect Of the Dispersantsmentioning

confidence: 97%

Improving Colloidal Stability of Sepiolite Suspensions: Effect of the Mechanical Disperser and Chemical Dispersant

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…Findings reported by different authors show that the addition of a small amount of anionic surfactant to an aqueous solution of water‐soluble polymers is followed by an increase in viscosity. For example, Alves et al () analyzed solutions of various surfactants with hydrophobically modified polyacrylic acid. At a pH level higher than 6.5, or through the binding of anionic surfactants, the polymer swells and forms a strong three‐dimensional network.…”

Section: Resultsmentioning

confidence: 99%

“…The behavior of surfactants and polymers in aqueous solutions has been widely discussed in the literature (Alves et al, 2018;Bossard et al, 2010;Deselnicu et al, 2015;Draelos et al, 2013;Gouveia et al, 2008;Koski et al, 2004;Panmai et al, 1999;Zhang et al, 2014). Findings reported by different authors show that the addition of a small amount of anionic surfactant to an aqueous solution of water-soluble polymers is followed by an increase in viscosity.…”

Section: Dynamic Viscositymentioning

confidence: 99%

“…The highest foam stability was noted in the bath liquid P4 enriched with Soluble Collagen (M w = 300,000 Da). The effect of adding polymers to surfactant solutions has been discussed in the literature (Alves et al, 2018;Bao et al, 2008;Bujak et al, 2018;Draelos et al, 2013;Fevola et al, 2010;Koski et al, 2004;Penfold et al, 2006;Petkova et al, 2013). Polymers, including proteins and hydrolysates, are used as foam-boosting ingredients in the food and cosmetics industries.…”

Section: Foaming Propertiesmentioning

confidence: 99%

See 1 more Smart Citation

Application Properties of Bath Liquids for Children Based on Sodium Laureth Sulfate with Addition of Different Molecular Weight Collagens Derived from Marine Sources

Klimaszewska

Ogorzałek

Seweryn

et al. 2019

J Surfact & Detergents

View full text Add to dashboard Cite

This article investigates the influence of marine collagen of various molecular weights (Collagen Amino Acids—150 Da, Hydrolyzed Collagen—12,000 Da and Soluble Collagen—300,000 Da) on the functional properties of bath liquids for children based on anionic surfactants—sodium laureth sulfate. In addition to the aspects related to safety‐in‐use, which were presented in the authors' first work about marine collagen, consumers also expect bath cosmetics for children to have specific functional characteristics including viscosity or foaming properties. An increase in the molecular mass of marine collagen was found to be accompanied by an increase in dynamic viscosity and foaming ability and a decrease in the ability to emulsify fatty soil in the formulations under study. It can, therefore, be concluded that the addition of the highest molecular weight of marine collagen (300,000 Da) to bath liquids for children contributes not only to reducing the irritant effect caused by anionic surfactants, but also improves the usable properties of these types of cosmetics.

show abstract

“…This result is mainly because the HLB value of sodium dodecyl sulfate is greater than Span 60. Theoretically, the higher the HLB value, the stronger the hydrophobicity (Alani et al 2016;Alves et al 2018;Kotani et al 2008). Therefore, the microcapsules are more dispersed in the solution by dissolving the core and shell material in the solution with water as the main solvent.…”

Section: Morphology Characterization Of Microcapsules and Veneered Pamentioning

confidence: 99%

Microencapsulation of formaldehyde scavenger agent and its application to veneered panels

et al. 2021

View full text Add to dashboard Cite

Formaldehyde scavenger agent can effectively control formaldehyde emissions from wood-based panels, but the existing formaldehyde scavenger agent can only work in the short term. For the purpose of long-term control of formaldehyde emissions from wood-based panels, microencapsulation of formaldehyde scavenger agent was synthesized in this paper. The effect of the emulsifying agent and the core to shell ratio on the microcapsules' morphology and formaldehyde degradation efficiency was investigated. The results showed that microcapsules of optimum morphology with high degradation efficiency can be obtained under the condition of 1% of the sodium dodecyl sulfate emulsifier, 3% of the shell solution, and a core to shell ratio of 1:3 with 1000 r/min stirring speed. The loading ratio and efficiency of the microcapsules achieved 36.25% and 8.05% respectively. Compared with control panels, the formaldehyde released from veneered panels treated with microcapsules was 39.7% and 41.4% lower in short-term and long-term emissions.

show abstract

On the rheology of mixed systems of hydrophobically modified polyacrylate microgels and surfactants: Role of the surfactant architecture

Cited by 19 publications

References 34 publications

Improving Colloidal Stability of Sepiolite Suspensions: Effect of the Mechanical Disperser and Chemical Dispersant

Improving Colloidal Stability of Sepiolite Suspensions: Effect of the Mechanical Disperser and Chemical Dispersant

Application Properties of Bath Liquids for Children Based on Sodium Laureth Sulfate with Addition of Different Molecular Weight Collagens Derived from Marine Sources

Microencapsulation of formaldehyde scavenger agent and its application to veneered panels

Contact Info

Product

Resources

About