Abstract
Accompanied with the changing of coagulation time, the micro-structure of aerogel can be controlled by adding Polyacrylic acid (PAA) into sol system. We simulate the process of particles aggregation contains attracting molecular chains based on diffusion-limited cluster aggregation (DLCA). Compared with the normal coagulation system, the coagulation rate of the system that contains attracting chains are sped up first and then slowed down. The results of the stimulation point out that the interaction between particles and chains not only accelerates the motion of particles, but also separates the region and constrains the clusters’ motion. These two effects are coexisting but the attracting interaction play a dominant role in the early state while the volume of chains has a dramatic influence on cluster’s motion in late states.
Highlights
The formation process of aerogel is a typical particles coagulation process, which is affected by a variety of factors such as temperature, gravity, the density of particles and etc.[1]
Based on diffused-limited cluster aggregation, we simulate the particles coagulation process contains attracting molecular chains to search the mechanism of adjusting micro-structure
The diffused-limited aggregation occurs when the repulsive force between particles could be negligible so that the coagulation rate is solely determined by the time taken for clusters to encounter each other.[4,5]
Summary
The formation process of aerogel is a typical particles coagulation process, which is affected by a variety of factors such as temperature, gravity, the density of particles and etc.[1]. Based on diffused-limited cluster aggregation, we simulate the particles coagulation process contains attracting molecular chains to search the mechanism of adjusting micro-structure. The results of simulation indicate the attracting chains accelerate the coagulation and constrain the motion of particles which lead to the redistribution of particles and the adjusting of the micro-structure. This theory gives scientist a direction to find suitable molecular chains which could regulate the structure of aerogels more efficiently
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