疏水化改性的介孔硅材料攜帶及釋放納米氣泡能力的研究
[Abstract]:Nanobubbles were first produced by Ishida et al., which were directly immersed in pure water by (OTS) modified with trichlorooctadecyl silane. Their existence has been confirmed by many experimental methods and has become a hot spot in the research of interface science. It is shown that in the presence of hydrophobic surfaces, the excess gas molecules tend to gather directly in the nucleation centers (defects or voids) of the solid surfaces, and exist stably in the form of nano-bubbles on the interface between the hydrophobic solids and the water. The stability of nano-bubble on the interface has a wide range of effects on surface science, hydrodynamics, biomedicine and some applications. Therefore, the properties and applications of nanoscale bubbles in solid / liquid interface are worthy of our exploration and study, which has very important theoretical significance and application value. In this paper, we investigate the influence of the hydrophobic properties and surface physicochemical properties of nano-silicon materials on the adsorption and desorption of nano-bubbles. The main contents are as follows: (1) in this thesis, we used poly (ethylene oxide), poly (propylene oxide) and poly (ethylene oxide) triblock copolymers (P123) as template, and hydrolyzed and copolymerized by bis (triethoxysilyl) ethane under acidic conditions. The support material of ethyl skeleton, (PMO), was synthesized and modified with different proportion of hexamethyldisilamine (HMDS) to different degree of hydrophobicity. To explore the effect of hydrophobicity on the ability of PMO carrier materials to carry and release nano-bubbles. The experimental results show that PMO nanocrystalline silicon can effectively adsorb / desorb oxygen nano-bubbles, and with the increase of hydrophobic degree, the ability of adsorption of oxygen nano-bubbles increases with the same physicochemical properties. At the same time, the ability of supplying oxygen to anoxic environment is stronger. (2) in this subject, we use polyoxypropylene polyoxyethylene copolymer (F127) as template, tetraethyl orthosilicate (TEOS) is hydrolyzed and copolymerized under acidic conditions. Then by controlling the temperature of the autoclave, the inorganic skeleton (FDU), with different pore size and specific surface area was prepared, and then modified by excessive (HMDS) of hexamethyldisilamine. The effects of physical and chemical properties such as pore size and specific surface area on the ability of FDU carrier to carry and release nano-bubbles were investigated. The experimental results show that FDU nanocrystalline silicon can effectively adsorb / desorb oxygen nano-bubbles, and its ability depends on the specific surface area and pore size of the material. When the degree of hydrophobicity is the same, the rate of adsorption and desorption of oxygen nano-bubble is proportional to the pore size of the material, and the content of the adsorbed oxygen nano-bubble is proportional to the specific surface area of the material.
【學(xué)位授予單位】:上海師范大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:O613.72;TB383.1
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