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Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
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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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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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Multistimuli-Responsive Foams Using an Anionic Surfactant.

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A novel surfactant offers tunable foam stability using pH and temperature triggers. This reversible control is promising for applications like enhanced oil recovery and environmental remediation.

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Area of Science:

  • Materials Science
  • Surface Chemistry

Background:

  • Controlling foam stability is crucial for various industrial processes.
  • Developing stimuli-responsive surfactants can offer precise control over foam properties.

Purpose of the Study:

  • To report a novel, commercially available surfactant with multi-stimuli-responsive foam stability.
  • To investigate the influence of pH and temperature on surfactant behavior and foam characteristics.

Main Methods:

  • Synthesized a surfactant comprising a hydrophobe, a temperature-sensitive block (polypropylene oxide), and a pH-sensitive carboxyl group.
  • Evaluated foamability and stability across varying pH and temperature conditions.
  • Assessed foam destabilization using CO2 gas and temperature changes.

Main Results:

  • The surfactant exhibited pH-dependent foamability, with optimal stability and fine bubble texture (approx. 200 μm) at higher pH.
  • Foam destabilization was achieved by lowering pH or increasing temperature to 65 °C.
  • Stimuli-induced foam stabilization and destabilization were reversible.

Conclusions:

  • This multi-responsive surfactant provides tunable control over foam stability.
  • Potential applications include foam-enhanced oil recovery and environmental remediation due to its reversible and controllable nature.
  • The surfactant's commercial availability and low cost enhance its practical utility.