Trimethylstearylammonium Chloride TCI S0087

Chemical Identity

Other names: STAC
CAS No.: 112-03-8
PubChem: CID 8155·SID 87575703
Formula: C21H46ClN
Molecular weight: 348.0 g/mol
Purity: >98.0%(T)
Reference databases: ChEBI·ChemSpider·ECHA

Full identifiers (IUPAC, SMILES, InChIKey)

IUPAC: trimethyl(octadecyl)azanium chloride
SMILES: CCCCCCCCCCCCCCCCCC[N+](C)(C)C.[Cl-]
InChIKey: VBIIFPGSPJYLRR-UHFFFAOYSA-M

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Trimethylstearylammonium Chloride from TCI, also known as octadecyltrimethylammonium chloride, is a quaternary ammonium salt that acts as a cationic surfactant. In the catalogue it is listed among the colloidal quantum dot research reagents. Each molecule has a positively charged trimethylammonium head group and a long octadecyl tail. In the laboratory, the compound serves as a structure-directing agent, a colloidal stabilizer, a phase-transfer agent, and a surface modifier in nanomaterial synthesis and formulation work.

Researchers choose this compound because its positive charge is permanent and does not depend on pH. As a result, its electrostatic interaction with negatively charged surfaces stays reliable across a wide range of reaction conditions. The long C18 tail is strongly hydrophobic and helps micelles form. That behaviour matters when templating pores in mesoporous silica and when stabilizing nanocrystals and quantum dots. Three pack sizes (25 g, 100 g, and 500 g) cover needs from early exploratory research up to laboratory-scale material production, so groups can scale up without changing reagent source.

In Indonesia, this reagent is relevant to materials science and nanotechnology laboratories at universities and research institutions, for example in quantum dot synthesis and studies of nanostructured materials. Research groups working on mesoporous materials, colloidal nanocrystals, and surface-modified particles can use it as a consistent cationic surfactant in their experimental protocols. Its role as a template and stabilizer makes it useful in thesis research, funded projects, and method development in materials chemistry laboratories.

TCI brochures (PDF)

Quaternary Ammonium Salts 2025-11-10 · p. 4
Colloidal Quantum Dot (QD) Research Reagents 2026-05-21 · p. 10
Polymer Additives 2026-04-16 · p. 11

Related TCI products

Mesoporous silica templating: the long C18 tail drives micelle formation, which provides the template around which ordered pores form during silica synthesis.
Quantum dot stabilization: the cationic head group and hydrophobic tail help keep colloidal quantum dots dispersed and stable during synthesis and post-synthetic processing.
Nanocrystal synthesis as a structure-directing agent: its surfactant behaviour helps guide the growth and organization of nanomaterials in solution-based preparation routes.
Phase-transfer processes: as a quaternary ammonium salt, it can help move charged species or particles between aqueous and organic phases in synthesis and formulation work.
Surface modification of negatively charged materials: its permanent, pH-independent positive charge allows reliable electrostatic binding to anionic surfaces to change their interfacial properties.

Brand	TCI (product code S0087)
CAS number	112-03-8
Molecular formula	—
Purity	—
Category	Materials Science > Electronic Materials > Colloidal Quantum Dot (QD) Research Reagents
Pack sizes	25 g, 100 g, 500 g
Physical form	—
Storage	follow the conditions on the TCI product label and Safety Data Sheet

Chemical class: quaternary ammonium salt, cationic surfactant

Keep this reagent in its original, tightly closed container in a cool, dry, well-ventilated area, away from moisture, direct sunlight, and incompatible materials such as strong oxidizing agents. Reseal the container promptly after each use to protect product quality. Handle the material with standard laboratory personal protective equipment, including gloves, safety glasses, and a lab coat. Avoid creating or breathing dust, and prevent contact with skin and eyes. Because cationic surfactants can irritate tissue, work in a fume hood or a well-ventilated area when weighing. Always check the TCI Safety Data Sheet for detailed hazard, storage, and disposal information, and dispose of waste in line with local regulations.

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