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APTS-modified silicon dioxide is often used as a rubber and ceramic filler; in the field of electronics, APTS-modified silica can be used to manufacture semiconductor devices and biosensors. In recent years, with the development of nanotechnology and biotechnology, APTS-modified silica nanoparticles in the field of inorganic nano-core-shell particles, immune biological testing, polymer coating materials exhibit great potential. Preparation APTS-modified silica are common vapor deposition method, liquid-phase modification method. Silica APTS characterization methods can be modified by infrared spectroscopy (IR), X-ray photoelectron spectroscopy (XPS), nuclear magnetic resonance spectroscopy (NMR), elemental analysis. Characterization of these, you can learn on the silica surface modification APTS amount, APTS layer thickness, density amino, bonding structure information. Numerous studies indicate that, different modification methods APTS layer generated on the chemical stability and there are differences in the chemical stability of the layer APTS APTS-modified silica is critical applications. This paper focuses on research progress in recent years APTS-modified silica is a brief overview: describes the typical method silica APTS modification after modification and characterization methods APTS layer; discusses the controllability of different modification methods, APTS finishing layer structure and stability; APTS-modified silica of potential applications and future research trends were prospected.

Vapor deposition is the common method of prepare APTS-modified silicon dioxide, liquid-phase modification method. Liquid modified method is divided into an aqueous solvent modification, a variety of methods modified organic solvents . Among the modification process, the basic reaction principle is silica nanoparticles, micron-sized silica gel, activated silica materials and so on glass surface silanol groups produced by the reaction and the APTS covalent bonds under different conditions. Si-OH reaction with the silica surface APTS. There are two main reaction mechanism. In aqueous conditions, the APTS molecule to generate a Si-ethoxy) OH with the water molecules in the hydrolysis, the resulting Si) Si OH and the silica surface) OH reaction occurs glycidyl (Formula 1), forming Si) O ) Si bond. 

At the same time, not only hydrolysis of APTS and Si silica surface) OH condensation, shrinking reaction also occurred between APTS molecule hydrolysis reaction occurs according to the mechanism of ships generate multiple molecular layers irregular. Under anhydrous conditions Si APTS molecule directly with the silicon dioxide surface ethoxy) OH reaction occurs acetal (Formula 2), forming Si) O) Si bond. Because the system does not react anhydrous between APTS molecule, so this reaction is a single molecular layer more regular. Thus, the presence of water in the reaction system directly determines the reaction mechanism and has a great impact on the APTS layer structure generated.


 

 

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