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Sigma-Aldrich

Trimethoxy(octadecyl)silane

technical grade

Synonym(s):

Octadecyltrimethoxysilane

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About This Item

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

grade

technical grade

Quality Level

100

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

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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.

Storage Class

10 - Combustible liquids

wgk_germany

WGK 1

flash_point_f

284.0 °F - closed cup

flash_point_c

140 °C - closed cup

ppe

Eyeshields, Gloves, type ABEK (EN14387) respirator filter

Certificates of Analysis (COA)

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Rodrigo Brambilla et al.
Analytical and bioanalytical chemistry, 391(7), 2673-2681 (2008-05-28)
A series of octadecylsilane-modified silicas were prepared by sol-gel and grafting methods. Carbon contents and octadecyl chain conformations were shown to depend on the preparative route. Grafting engenders a low carbon content and a liquid-like chain conformation, while the sol-gel
Kristen S Wilson et al.
Biomaterials, 26(25), 5095-5103 (2005-03-29)
This study was designed to determine the effect of varying the chemistry of the interfacial phase on critical composite properties in dental nanocomposite materials. Silica nanoparticles were silanized with varying ratios of 3-methacryloxypropyltrimethoxysilane (MPTMS) and octyltrimethoxysilane (OTMS) while keeping the
Superhydrophobicity, UV protection and oil/water separation properties of fly ash/Trimethoxy (octadecyl) silane coated cotton fabrics.
Khan MZ, et al.
Carbohydrate Polymers, 202(2-3), 571-580 (2018)
Superhydrophobic and photocatalytic self-cleaning cotton.
Afzal S, et al.
Journal of Material Chemistry A, 2(42), 18005-18011 (2014)
Noncovalent assembly of reduced graphene oxide and alkyl-grafted mesoporous silica: an effective drug carrier for near-infrared light-responsive controlled drug release.
He D, et al.
Journal of Material Chemistry B: Materials for Biology and Medicine, 3(27), 5588-5594 (2015)
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