poster formato

1
Titulo xxxxx Lizzet Apaza a , Edwin Escalera a , Roberto Soto a a Proyecto 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. Resultados Figure 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 NaBH 4 Conclusione s 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-(CH 3 ) 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 I Si-OH /I C-H , were increased due to P123 was burnt. C o + 2 C H 3 C H 3 C H 3 S i O O Monodispersed silica as-SBA- 15 - Pore size: ~ 9 nm - Surface area: 704.39 m 2 /g Objetivo C H 3 C H 3 C H 3 S i O CH 3 CH 3 CH 3 Si O CH 3 CH 3 CH 3 Si O OH O H O H O H OH OH Three steps: Cobalt ( ) Cobalt nanoparticles have xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxx The xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx Motivation • Comprender y conocer como evolucionan la resistencia mecanica a la compresion de los materiales ceramicos en funcion de la temperatura. 10 nm 50 nm C H 3 C H 3 C H 3 S i O O H O H CH 3 CH 3 CH 3 Si O CH 3 CH 3 CH 3 Si O O H O H O H O H O H O H O H O H C H 3 C H 3 C H 3 S i O N H 2 S i - C o + 2 O -Si NH 2 C o + 2 O -Si NH 2 C o + 2 O N H 2 S i - 0 2 4 6 8 10 0 200 400 600 800 1000 1200 1400 1600 Cu Cu Co Co Si Co C ounts E nergy (keV ) EDX 0 1 2 3 4 5 6 7 8 9 10 0 2000 4000 6000 8000 10000 12000 14000 16000 Cu Co Co Cu Si Co O C ounts E nergy (keV ) EDX

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Page 1: Poster Formato

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