Download - Sil an Ization
-
8/11/2019 Sil an Ization
1/31
Surface silanization
1
-
8/11/2019 Sil an Ization
2/31
Metal or metal alkoxidesSol-gel processes
2
-
8/11/2019 Sil an Ization
3/31
-
8/11/2019 Sil an Ization
4/31
-
8/11/2019 Sil an Ization
5/31
-
8/11/2019 Sil an Ization
6/31
Rate constant for acid-catalyzed hydrolysis of alkoxysilanes
according to the alkyl chain length and ramification20C
6R. Aelion et al., J. Am. Chem. Soc.1950, 72, 5705
-
8/11/2019 Sil an Ization
7/31
Base-catalyzed hydrolysis of alkoxysilanes
7C.J. Brinker, J. Non-Cryst. Solids 1988, 100, 31
-
8/11/2019 Sil an Ization
8/31
-
8/11/2019 Sil an Ization
9/31
Inductive effect of sustituent of alkoxysilanes
9C.J. Brinker, J. Non-Cryst. Solids 1988, 100, 31
-
8/11/2019 Sil an Ization
10/31
!ifferent path"ays oforganosilanes grafting onhydroxylated surfaces
10A. Y. Fadeev et al. Langmuir 2000, 16, 7268
-
8/11/2019 Sil an Ization
11/31
Hydrolysis of functionalizedsiloxanes at a surface
F. Rondelez et al. Langmuir 1994, 10, 436711
-
8/11/2019 Sil an Ization
12/31
#xperimental setup for a surface silanization
F. Rondelez et al. Langmuir 1994, 10, 436712
-
8/11/2019 Sil an Ization
13/31
$rafting of n-hexadecyltrichlorosilane %n & '() on silicon oxide
Surface tension against cosine of thecontact angle of 3 different alkanedrops (octane, nonane and decane)for three silane layers prepared atdifferent temperatures
F. Rondelez et al. Langmuir 1994, 10, 436713
Critical surface tension (for cos = 1)against preparation temperature
-
8/11/2019 Sil an Ization
14/31
*ransmission infrared spectroscopy of surface grafted alkyl chains
ontemperatu
re,
C
F. Rondelez et al. J. Phys. Chem. 1994, 98(31), 758114
prepar
at
C-H stretching of CH2 and CH3
Asymetric CH2stretching moves from 2917 to 2922 cm-1 on temperature increase
-
8/11/2019 Sil an Ization
15/31
-
8/11/2019 Sil an Ization
16/31
-
8/11/2019 Sil an Ization
17/31
Analysis y Infrared spectroscopy
After grafting on TiO2
17
C18H37SiH3
H2O stretchingH2O deformation
H2O linked tosurface oxygen Siloxanes
CH2 CH2SiH SiH
A.-Y. Fadeev et al. Langmuir 2004, 126, 7595
-
8/11/2019 Sil an Ization
18/31
-
8/11/2019 Sil an Ization
19/31
-
8/11/2019 Sil an Ization
20/31
+,Si MR spectra of self-assemled polyalkylsiloxane layers
TiO2
Al2O3
MgO
Substrate
20
A.-Y. Fadeev et al. Langmuir 2004, 126, 7595
Si-O-Si
Reference compounds
M-O-Si
The polysiloxane network is not linked to the oxide surface
-
8/11/2019 Sil an Ization
21/31
.roposed mechanism for gro"th of self-assemled polyalkylsiloxane monolayer
1 2
21
A.-Y. Fadeev et al. Langmuir 2004, 126, 7595
1. Acid or basic catalytic hydrolysis of the silicon hydride2. Polycondensation of the silanol bonds
Reaction of silicon hydride depends on the catalytic activity of the surfaceand so leads selectively to a monolayer
-
8/11/2019 Sil an Ization
22/31
Silanization can lead to loosely grafted structures
22J.-P. Pillot et al. Langmuir 2009, 25, 5526
-
8/11/2019 Sil an Ization
23/31
$rafting of aminoalkylsilanes
The most commonly used reactive molecule :
Aminopropyltriethoxysilane, APTES
a) Ideal surface structure
23
b) Actual surface structure asdeduced from XPS N1sspectroscopy
c) X-ray Photoelectron
Spectroscopy of a graftedsurface, in green : theexpected NH2 signal
C-NH3+
L. Ploux et al. J. Phys. Chem. C 2011, 115, 11102
-
8/11/2019 Sil an Ization
24/31
-
8/11/2019 Sil an Ization
25/31
$rafting of epoxyalkylsilanes
25
-
8/11/2019 Sil an Ization
26/31
$rafting of mercaptoalkylsilanes
26
-
8/11/2019 Sil an Ization
27/31
$rafting of an enzyme
27
-
8/11/2019 Sil an Ization
28/31
Heteroifunctional linker
28
-
8/11/2019 Sil an Ization
29/31
/ther methods for coupling enzymes
29
-
8/11/2019 Sil an Ization
30/31
Biocidal cationic surfaces
30F. Rondelez et al. Microbiology 2005, 151, 1341
-
8/11/2019 Sil an Ization
31/31
Biocidal cationic surfaces
E. coli
The viable bacteria are green
31F. Rondelez et al. Microbiology 2005, 151, 1341
S. epidermitis