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A reaction calorimetry study of the synthesis of a mesoporous silica material

De Prada Lopez, Javier LU (2013) KEMP37 20131
Department of Chemistry
Abstract
Oredered mesoporous materials present many potential applications. But beforehand, thorough understanding of these materials and their synthesis is required.
This Thesis focuses on the observation of the hydrolysis process of TMOS, one of the silica sources used in the synthesis of these materials, at real synthetic conditions.
The study was performed using a reactor calorimeter, a type of calorimeter design to resemble real reactors, and at pseudo-isothermic contditions
Popular Abstract
The focus of the thesis is to explore the hydrolysis step of the silica source in the synthesis of mesoporous silica materials.
These materials are made of the same material as the sand, but they have pores in the order of the nanometers (1nn=0.000001mm), all of them of similar size, and with those pores arranged in a certain and constant pattern in all the material; These materials are formed as particles.
To generate such pattern, it is also required a surfactant, that is a molecule with a fragment that tends to be close to water, and another fragment that tries to escape from water. Because of this, when this surfactant is put in water, the fragments that want to escape from water hide by getting closer to similar fragments from other... (More)
The focus of the thesis is to explore the hydrolysis step of the silica source in the synthesis of mesoporous silica materials.
These materials are made of the same material as the sand, but they have pores in the order of the nanometers (1nn=0.000001mm), all of them of similar size, and with those pores arranged in a certain and constant pattern in all the material; These materials are formed as particles.
To generate such pattern, it is also required a surfactant, that is a molecule with a fragment that tends to be close to water, and another fragment that tries to escape from water. Because of this, when this surfactant is put in water, the fragments that want to escape from water hide by getting closer to similar fragments from other molecules of surfactant, while at the same time the fragments that like water, are sent to face the water; this generates structures formed of an envelope of fragments that want to be close to water surrounding those fragments that want to hide from water; these structures are called micelles (an the shape can be sphererical, rod-like, or they can be as cylinders), and at certain conditions, you can find that most of the micelles present are similar in shape and size, moreover, the "relate" with each other so it can be seen certain order among them. Then, when that silica forms around these micelles, and afterwards the micelles are eliminated, the reult are those order pores of similar size.
But to form the silica, you first need a so-called silica source, that is simply a compound that when immersed in water transforms in a way that allows it to join creating silica. This project aimed at see what happened with one of those silica sources just before it starts to join, to see that first transformation, meassuring the heat that transformation generates. (Less)
Please use this url to cite or link to this publication:
author
De Prada Lopez, Javier LU
supervisor
organization
course
KEMP37 20131
year
type
L3 - Miscellaneous, Projetcs etc.
subject
keywords
fysikalisk kemi, Physical Chemistry
language
English
id
4295372
date added to LUP
2015-02-01 15:11:12
date last changed
2015-02-01 15:11:12
@misc{4295372,
  abstract     = {Oredered mesoporous materials present many potential applications. But beforehand, thorough understanding of these materials and their synthesis is required.
This Thesis focuses on the observation of the hydrolysis process of TMOS, one of the silica sources used in the synthesis of these materials, at real synthetic conditions.
The study was performed using a reactor calorimeter, a type of calorimeter design to resemble real reactors, and at pseudo-isothermic contditions},
  author       = {De Prada Lopez, Javier},
  keyword      = {fysikalisk kemi,Physical Chemistry},
  language     = {eng},
  note         = {Student Paper},
  title        = {A reaction calorimetry study of the synthesis of a mesoporous silica material},
  year         = {2013},
}