Lecture 3

Question 1

Do porous glasses have a three dimension branched microstructure?

Answer 1

Yes

Question 2

Which is the pore range of porous glasses

Answer 2

1 - 1000 nm

Question 3

When you melt which material, you obtain glass?

Answer 3

Quartz sand and soda

Question 4

What do you have to do to prevent crystallisation, when talking about porous glasses…?

Answer 4

Rapid cooling

Question 5

What can disturb the formed framework of a tetrahedra porous glass?

Answer 5

Sodium, potassium or calcium oxide

Question 6

Which temperature has to be heated the Alkali-borosilicate when synthetizing glass?

Answer 6

500 - 700 °C

Question 7

What are the most important synthesis parameters

Answer 7

Composition of the starting material
Temperature
Heat treatment duration

Question 8

What determines the pore width of the product?

Answer 8

Temperature
Duration of the heat treatment

Question 9

Porous glasses can be produced as

Answer 9

Powders and monoliths

Question 10

Porous glasses surface contains silanol groups?

Answer 10

Yes

Question 11

Thanks to the presence of silanol groups in the surface of porous glasses; which properties can be controlled?

Answer 11

Adsorption and Catalytic

Question 12

Zeollites origin can be

Answer 12

Natural and artificial

Question 13

Zeolites are synthesised under hydrothermal conditions. Therefore __________ and _______ have to be defined and constant

Answer 13

Temperature and pressure

Question 14

Whats the shape of zeolites when the origin is natural or artificial?

Answer 14

Natural: rock shape
Artificial: Pellet shape

Question 15

Zeolites pore system and pore width are

Answer 15

Defined and narrow

Question 16

Zeolites can connect via

Answer 16

Surfaces
Edges

Question 17

What does define textural properties in the Zeolites?

Answer 17

Structural composition