376213

Trimethoxy(octadecyl)silane

technical grade

• Synonym(s): Octadecyltrimethoxysilane
• Linear Formula: CH₃(CH₂)₁₇Si(OCH₃)₃
• CAS Number: 3069-42-9
• Molecular Weight: 374.67
• Beilstein: 5791830
• EC Number: 221-339-2
• MDL number: MFCD00043060
• UNSPSC Code: 12352103
• PubChem Substance ID: 24863428
• NACRES: NA.23

Properties

• grade: technical grade
• form: liquid
• refractive index: n20/D 1.439 (lit.)
• mp: 16-17 °C (lit.)
• density: 0.883 g/mL at 25 °C (lit.)
• SMILES string: CCCCCCCCCCCCCCCCCC[Si](OC)(OC)OC
• InChI: 1S/C21H46O3Si/c1-5-6-7-8-9-10-11-12-13-14-15-16-17-18-19-20-21-25(22-2,23-3)24-4/h5-21H2,1-4H3
• InChI key: SLYCYWCVSGPDFR-UHFFFAOYSA-N

Description

General description

Trimethoxy(octadecyl)silane (OTMS) is an alkyl silane that functionalizes a variety of nanoparticle surfaces and facilitates a hydrophobic coating with a high-water contact angle and low surface energy.

Trimethoxy(octadecyl)silane (OTS) is an important alkylsilane that can form strong covalent bonds with silicon oxide and serves as a potential lubricant for micro electro mechanical systems (MEMS). OTS is largely used for surface chemical modification, modifying silica resulted in an increased charge carrier mobility for a variety of vacuum deposited and solution cast organic semiconductors.

Application

Magnetic nanoparticles (Fe₂O₃) can be surface modified with OTMS. It forms a sorbent for the magnetic solid-phase extraction (MSPE) of endocrine disruptors (organochlorine pesticides) from milk samples. It may form a corrosion protective coating on AZ31 magnesium alloy that finds potential application in automotive industry. It may also be used to form a composite with fly ash that can be coated to achieve a superhydrophobic and UV-protected cotton fabric.

OTS is used for the development of self assembled monolayers(SAMs). OTS is also used to modify the silica dielectric surface in organic field effect transistors.

Safety Information

• Storage Class Code: 10 - Combustible liquids
• WGK: WGK 1
• Flash Point(F): 284.0 °F - closed cup
• Flash Point(C): 140 °C - closed cup
• Personal Protective Equipment: dust mask type N95 (US), Eyeshields, Gloves