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• W1569017677 abstract "Popular summaryThis master thesis was focused on the influence of salt, such as NaCl and CaCl2, in the formationof carboxylic functionalized mesoporous silica materials.Mesoporous silica materials are one type of porous materials with a pore size between 2 and 5nm (1 = 0.000000001 ). The walls of the pores in this kind of materials consist of silicondioxide, which is called silica (sand). The mesoporous silica materials, or rather the mesoporoussilica particles, are formed by amphiphilic molecules, a kind of molecule with one part that loveswater and one part that hates water, and a silica source. Within the group of amphiphilicmolecules, surfactants are mostly used. The surfactants are molecules with positive or negativecharged head groups, which love water, and long organic tails, that hate water. Examples ofsurfactants in our daily life are shampoo and detergent. When the surfactants have beendissolved in water, the tails that hate water will get together and only leave the charged headgroups outside in contact with the water. In this case, the grouped surfactants can form differentshapes with the tails inside and the head groups on the surface of the shapes. The silica sourcewill build up walls around these shapes. Accordingly, the “mesopores” of the materials are filledwith surfactants during their creation. When the surfactants are removed, the mesopores arise,and the mesoporous materials with silica walls are formed. The networks of mesopores are oftenwell ordered in various structures. When adding acid or salt into the formation mixture ofmesoporous silica materials, the structure or the shape of the materials (particles) can sometimesbe changed. The process is like baking, when adding different things, such as baking powder orsalt, the shape or the texture of the pastries can be changed.In the work of this thesis, a surfactant with positive charged head group was used. Moreover,one kind of molecule consists of a negative part and a silicon part was added in the mixture. Thenegative part of this molecule is called carboxylic group, which is the major component ofvinegar. In the mixture, this molecule will be in contact with the surfactant head group via thecarboxylic part and in contact with the silica source via the silicon part. After the formation,when the surfactants are removed, the carboxylic groups will remain within the pores, therefore,carboxylic functionalized mesoporous silica (CFMS) materials are formed. Addition of acid canchange the structures of the CFMS materials. The shapes of the particles can change dependingon the structure. In this work we show that addition of salt can change the structures and theshapes of the CFMS particles. Additionally, the particle sizes increase when the amount of saltincreases. Some of the CFMS particles have interesting and well-defined shapes, as shown inFigure 1. This means that salts can be used as control chemicals in the formation." @default.
• W1569017677 created "2016-06-24" @default.
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• W1569017677 date "2012-01-01" @default.
• W1569017677 modified "2023-09-27" @default.
• W1569017677 title "The influence of salt in the formation of carboxylic functionalized mesoporous silica" @default.
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