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Cationic Chain-Growth Polymerization: Mechanism00:57

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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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Ion Exchange

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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Anionic Chain-Growth Polymerization: Mechanism01:04

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The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
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Generation and Control of Electrohydrodynamic Flows in Aqueous Electrolyte Solutions
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Marangoni flows triggered by cationic-anionic surfactant complexation.

Ali Nikkhah1, Sangwoo Shin1

  • 1Department of Mechanical and Aerospace Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA.

Journal of Colloid and Interface Science
|July 18, 2024
PubMed
Summary
This summary is machine-generated.

Interactions between mixed surfactants at fluid interfaces create complex Marangoni flows. Understanding these dynamics is crucial for applications like oil remediation and pathogen spread.

Keywords:
ComplexationMarangoni flowsReaction kineticsSurface tensionSurfactants

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Area of Science:

  • Fluid dynamics
  • Surface chemistry
  • Interfacial phenomena

Background:

  • Marangoni flow is induced by surfactant gradients at fluid interfaces.
  • Biological and environmental fluid interfaces often contain mixtures of surfactants.
  • Interactions within multi-component surfactant mixtures can significantly alter flow dynamics.

Purpose of the Study:

  • To quantitatively investigate Marangoni flows induced by reacting surfactant mixtures.
  • To analyze the impact of surfactant interactions on flow patterns.
  • To explore the role of composition in interfacial phenomena.

Main Methods:

  • Employed flow visualization techniques.
  • Conducted surface tension and reaction kinetic measurements.
  • Utilized numerical simulations for quantitative analysis.
  • Investigated binary surfactant mixtures.

Main Results:

  • Confirmed the impact of surfactant interactions on Marangoni flows.
  • Observed diverse and complex flow patterns from oppositely charged surfactant mixtures.
  • Identified unique flow patterns arising from composition-dependent interfacial phenomena.
  • Demonstrated varied flow dynamics based on surfactant ratios and concentrations.

Conclusions:

  • Surfactant interactions profoundly influence Marangoni flow dynamics.
  • Composition-dependent interfacial phenomena drive unique flow patterns in mixed surfactant systems.
  • Findings offer insights for oil remediation and understanding pathogen dispersal.