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Tituloxxxxx
Lizzet Apazaa, Edwin Escaleraa, Roberto Sotoa
aProyecto No-Metalicos, Departamento de Quimica, Facultad de Ciencias y Tecnologia , Universidad Mayor de San Simon , Cochabamba -Bolivia.
• Comparar la resistencia a la compresion de materiales ceramicos producidos a partir de la arcilla roja del tropico de Cochabamba y de arcillas que utilizan en las industrias ceramicas del valle de Cochabamba.
ResultadosFigure 1. Schematic xxxxxxxx.
Figure 3. Transmission Electron Microscopy: (a) xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
1) External surface modification with Trimethylclorosilane (TMCS),
and calcination 300 °C/5h
3) Co(II) ions Impregnation, and reduction with solution of NaBH4
Conclusiones
Procedimiento experimental
TEM studies: TEM micrograph in figure 3a, represents the impregnated SBA-15 silica with cobalt nanoparticles. It is clear that the pores of the silica are partially occupied by cobalt nanoparticles, and also the order of the porous framework is intact after the formation of these nanoparticles. The presence of the cobalt into the silica was confirmed by EDX elemental composition (Figure 3c).
After dissolving the silica with NaOH solution (0.5M), cobalt nanoparticles around 2-4 nm can be easily seen in top of the carbon grid holder (Figure 3b).
Figure 2. FTIR spectra of (a) xxxxxxxxxxxxxxxxxxxxxxxxxxxx
2) Internal surface modification with 3-aminopropyltrimethoxisilane
(APTMS).
FTIR studies: Figure 2a: Characteristic absorption bands of Si-O-Si at 1062 cm-1, C-H stretching at 2900-3092 cm-1 of P123 and O-H stretching at 3483 cm-1 can be observed in the IR-spectra of SBA-15 silica and its template P123 inside the pores.
Figure 2b: After external functionalization, absorption intensity of silanol (OH) groups decrease but, the intensity of IR absorption increase for the C-H group at 2939-3092 cm-1, and also the band at 838 cm-1 can be seen, which is attributed to the Si-C stretching of (-Si-(CH3)3 recently formed.
Figure 2c: After calcination, bands at 2900-3000 cm-1, confirmed that the methyl groups from TMCS are still present on the silica, and also the ratio of ISi-OH/IC-H, were increased due to P123 was burnt.
Co
+2
CH
3
CH
3 CH
3
Si
O
O
Monodispersed silica as-SBA-15
- Pore size: ~ 9 nm - Surface area: 704.39 m2/g
Objetivo
CH
3
CH
3 CH
3
Si
O
C
H3
CH
3
CH
3
S
i
O
C
H3
CH
3
C
H3
S
i
O
OHO
HO
HO
H
OH
OH
Three steps: Cobalt ( )
Cobalt nanoparticles have xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxx
The xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Motivation• Comprender y conocer como evolucionan la resistencia mecanica a la compresion de los materiales ceramicos en funcion de la temperatura.
10 nm50 nm
CH
3
CH
3 CH
3
Si
O
OH O
H
C
H3
CH
3
C
H3
Si
O
CH
3
CH
3
CH
3
Si
O
OH
OH
OH
OH
OHO
HO
H
OH
CH
3
CH
3 CH
3
Si
O
NH
2 Si-
Co
+2
O -Si
N
H2
Co
+2
O -Si
N
H2
Co
+2O
NH
2 Si-
0 2 4 6 8 100
200
400
600
800
1000
1200
1400
1600
Cu
Cu
Co
Co
SiCo
Cou
nts
Energy (keV)
EDX
0 1 2 3 4 5 6 7 8 9 100
2000
4000
6000
8000
10000
12000
14000
16000
CuCo
CoCu
Si
Co
OCou
nts
Energy (keV)
EDX