1-Methyl-3-octadecylimidazolium chloride, CAS: 171058-19-8

Key Applications:

1. Surfactant and Interfacial Engineering

• Long C18 alkyl chain provides strong amphiphilicity, enabling use as a cationic surfactant in emulsification, dispersion stabilization, and interfacial modification.
• Effective in oil–water systems, particularly where high thermal stability and ionic strength tolerance are required.

2. Antimicrobial and Antifouling Formulations

• Quaternary imidazolium headgroup combined with a C18 tail supports activity against bacteria and fungi.
• Used in coatings, surface treatments, and polymer additives where durable antimicrobial performance is needed.

3. Phase‑Transfer and Catalytic Media

• Functions as a phase‑transfer catalyst in biphasic organic–aqueous reactions, especially those involving nucleophilic substitutions or alkylations.
• Serves as a structured ionic medium for catalytic transformations requiring low volatility and high thermal stability.

4. Template Agent for Nanomaterials

• Acts as a structure‑directing agent in the synthesis of mesoporous materials, nanoparticles, and hybrid organic–inorganic frameworks.
• Long-chain imidazolium cations promote ordered assemblies and tunable pore architectures.

5. Electrochemical and Interfacial Studies

• Useful in electrode surface modification, formation of self‑assembled monolayers, and studies of long‑chain ionic liquid behavior at charged interfaces.
• Supports research on ionic conduction, double‑layer structure, and ion–surface interactions.

6. Polymer and Composite Processing

• Enhances compatibilization between hydrophobic polymers and inorganic fillers.
• Can be incorporated into ionically functionalized polymers to tune mechanical, thermal, and transport properties.

7. Solvent and Co‑solvent in Extraction Systems

• Employed in liquid–liquid extraction of hydrophobic organics and metal complexes.
• High hydrophobicity and low volatility make it suitable for closed‑loop extraction systems.

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