LITERATURE STUDY OF VARIOUS SYNTHESIS OF SILICA MICROSPHERES

• Main Author: Muhtadi, Harid
• Format: Final Project
• Language: Indonesia
• Subjects: Kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/70382
• Institution: Institut Teknologi Bandung

Modification of the synthesis technique of silica microspheres has been carried out in order to obtain specific sizes and shapes of silica spheres according to the required function. This research is about a literature study on the synthesis of silica spheres based on the Stöber method which produces hollow and mesoporous silica spheres. Stöber et al. first synthesized microsphere silica by hydrolyzing Tetraethylorthosilicate (TEOS) as a precursor with a mixture of ammonia, alcohol and water. Many researchers modified the synthesis method by adding surfactants such as cetyltrimethylammonium bromide (CTAB) or polymers such as triblock copolymers, which resulted in new forms of hollow microsphere silica and mesoporous microsphere silica in various types and sizes. The data analyzed were taken (citations) from 60 journals related to silica microspheres from 1990-2012, with some supporting additional literature. Furthermore, analyzing data from journals that have been obtained regarding what factors can affect the size and shape of hollow microsphere silica and mesoporous microsphere silica. The synthesis of microsphere silica using Stöber's method can be modified by means of chemical treatment in the form of addition of surfactants and addition of polymers. Modification of synthesis by chemical treatment affects the shape of silica microspheres which are useful for metal binding agents and special pharmaceutical ingredients. Another synthesis modification with physical treatment in the form of the influence of pH, synthesis time and temperature so that it can be synthesized silica microspheres with a specific size and shape. The results obtained are the proposed sol-gel technique for the synthesis of hollow microsphere silica and a modification of the Stöber method with the addition of cationic surfactants. CTAB surfactant is better than other types of surfactants because it has a more stable and homogeneous microsphere silica. Polystyrene polymers or triblock copolymers can also be used as templates. The pH used in the synthesis, the higher the pH, the larger the size of the silica will be. The diameter of silica microspheres tends to decrease with increasing synthesis time. The increase in temperature will increase the diameter of the silica microspheres.