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Abstract

ABSTRACT

Preparation and characterization of the colloidal silica particles with thiol group on surface and their applications Si Yeon Kim Department of Chemical Engineering Graduate School Hanyang University

silica particles with modified surface with thiol group is very attractive substance because of their heavy metal removing effect and antibacterial effect. In case of the silica particles with thiol functional group, two step preparation method have been investigated and reported. Typically, silica particles are prepared by modified Stöber method and then are treated by 3-mecaptopropyltrimethoxysilcane to obtain surface with thiol groups. This preparation method gives mono-dispersed particles with narrow size distribution and high yields. However, there is point and complicated process using a large amount of alcohol in two disadvantages. Recently, however, a new method for producing silica particles having a thiol group on the surface in a single step has been reported. This method gives mono-dispersed silica particles with surface thiol group without the use of alcohol and complicated processing steps. However, one-step method has a thiol group on the surface is still in the micrometer size level synthesis for nanoparticles has not been reported. As a result, the application area of the resulting particles obtained by one-pot process can not be expanded because of large particle size.

The main topic of this study was the use of precursors of organosilane phosphorus (3-mercaptopropyl) trimethoxysilane, Polymeric Surfactants of the Fluonic Type belonging to the Pore Polymer Using poly (ethylene glycol) -block-poly (propylene glycol) -block-poly (ethylene glycol), without the use of alcohol to control the size of the particles was 30 nm. The resulting particles have a uniform distribution and high yield. Organic silane can be used to synthesize particles of the desired nanometer size without any need for surface modification. In addition, much more functional groups are present on the surface of the particles than those imparting functional groups through surface modification. That is, it has a thiol functional groups more than if the surface modified with a thiol group on the silica particles. In addition, since the particle size is controlled to the level of 30 nanometers, it can be said that the effect is very great depending on the future application field.

Two kinds of studies were carried out by evaluating the characteristics of the generated particles. First, Staphylococcus aureus and E. coli were evaluated for antimicrobial activity by Experimental No. 2149 of the American Society for Testing and Materials. Evaluation of toxicity by frog embryo malformed factor analysis standard method was carried out. The resulting silica particles were also tested for several applications. Heavy metal removal characteristics using the lead was evaluated by using the filtration method and precipitation method. Based on these results, the synthesized silica colloid solution was mixed with the polymer to produce a pellet-shaped master batch. Through the production of raw materials, the Korea Institute of Industrial Technology (KITI) adds the polymer to produce filaments, a mask filter was fabricated using electrospinning and a characteristic test was conducted. In addition, the surface coating was found to conveniently available for use than the real world.

As a result of the characteristic test, it is confirmed that it is 99.9% of the antibacterial power and the non-toxic substance, and it can be immediately used without post treatment and processing. Heavy metal removal characteristics was able to evaluate the performance over the color change. The masterbatch produced is excellent in stability and storage and can be used for various industries and industries. Fabrics were fabricated using the produced filaments, and the performance evaluation of the mask filter by electrospinning was also confirmed by color change and concentration change.