Breakage of nanoparticle cluster require high-intensity devices for stable and uniform distribution of aggregates. The ultra-sonication process is a high energy-intensive technique that produces cavitation effect to break the aggregates. In the present study, ultra-sonication is used for the de-agglomeration of fumed silica nanoparticles in low to high viscosity liquids. Water- and glycerol-based dispersion has been investigated at different solid loadings (up to 10 wt% for water-based dispersion and 5 wt% in glycerol-based dispersion) and viscosity of continuous phase (1–100 mPa.s). Breakup mechanism and kinetics have been studied at optimized operating conditions and no significant effect is found at different solid loadings on breakup mechanism. Particle size measurements are reported and found that volume of fine generation increased with an increase in sonication time. Further, it is observed that the stability of dispersion in the liquid is very high even at high concentration of solid used. Larger agglomerates are found at high viscosity of continuous phase and a lag is also observed for 100 mPa.s glycerol solution even at low solid loading (1 wt%). From, rheological characterizations it is found that the behavior of dispersed solution changed with time, temperature and solid loading. Erosion is found to be the breakup mechanism and further, validated with scattering light characterization. Furthermore, power draw increased with an increase in the viscosity of continuous phase, however, no significant effect of solid loading is observed. It is also observed that process is more energy-efficient at higher solid loading as the volume of fine produced is more as compared to low solid loading. Therefore, it can be concluded that the stable and uniform dispersion of nanoparticles can be achieved using an ultra-sonication device at high solid loading in viscous liquids.

纳米颗粒簇的破裂需要高强度的装置以稳定和均匀地分布聚集体。超声处理是一种高能耗技术，会产生空化作用以破坏聚集体。在本研究中，超声处理用于在低至高粘度液体中对气相二氧化硅纳米颗粒进行解聚。对水和甘油基分散体在不同的固体负载量下（水基分散体的最高含量为10 wt％，甘油基分散体的最高含量为5 wt％）和连续相的粘度（1–100 mPa.s）进行了研究。已经在优化的操作条件下研究了破碎机理和动力学，并且在不同的固体载荷下对破碎机理没有发现显着影响。报告了粒度测量，发现随着超声处理时间的增加，细粉的生成量也增加了。此外，观察到即使在使用高浓度的固体的情况下，在液体中的分散体的稳定性也非常高。在连续相的高粘度下发现较大的团聚体，即使在低固含量（1 wt％）下，对于100 mPa.s的甘油溶液也观察到滞后。从流变学特征发现，分散溶液的行为随时间，温度和固体负载而变化。发现侵蚀是破裂的机理，并且进一步通过散射光表征进行了验证。此外，功率消耗随连续相粘度的增加而增加，但是，未观察到固含量的显着影响。还观察到，与较低的固体载量相比，由于产生的细粉的体积更大，因此在较高的固体载量下该方法更加节能。因此，可以得出结论，使用超声设备在高粘性负载于粘性液体中时，可以实现纳米颗粒的稳定且均匀的分散。