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通过考察水与表面活性剂的摩尔比(R),TEOS的量、氨水的量及包壳次数对基于Triton X 100/环已烷/正已醇/水反相微乳液体系制备二氧化硅纳米颗粒尺寸的影响,开展了基于反相微乳液法的尺寸可控性二氧化硅纳米颗粒制备研究.结果表明:在其他参数都恒定的情况下,通过改变微乳液体系中上述某一组分的量,可以在一定程度上实现二氧化硅纳米颗粒的尺寸可控性合成.首先,水与表面活性剂的摩尔比(R)对二氧化硅纳米颗粒的尺寸影响最大,随着R值的增大,颗粒的粒径逐渐减小,当R值达到18时,二氧化硅纳米颗粒的形貌变得不再是很规则的球形结构,并且分散性降低,团聚现象明显;其次是氨水的量,随着氨水量的增多,颗粒的粒径先减小,之后不再发生明显变化;另外随着包壳次数的增多,颗粒的粒径随之增大,并且颗粒之间的分散性也有所提高;但是TEOS的量对颗粒粒径的影响不明显.
The silica nanoparticles were prepared by a reversed phase microemulsion system based on Triton X 100 / cyclohexane / n-hexanol / water by examining the molar ratio of water to surfactant (R), the amount of TEOS, the amount of ammonia, Particle size, the size-controlled silica nanoparticles based on reversed-phase microemulsion method were studied.The results show that by changing the content of one of the above components in the microemulsion system under the condition of other parameters being constant, , The size-controllable synthesis of silica nanoparticles can be achieved to a certain degree.Firstly, the molar ratio of water to surfactant (R) has the greatest effect on the size of silica nanoparticles. With the increase of R value When the R value reached 18, the morphology of silica nanoparticles became no longer a regular spherical structure, and the dispersibility decreased, agglomeration was obvious; followed by the amount of ammonia , With the increase of the amount of ammonia, the particle size decreases first, and then no significant change occurs. In addition, as the number of the shell increases, the particle size increases, and the dispersion between particles also has But the effect of the amount of TEOS on the particle size does not obvious.