A colloidal damper (CD) can dissipate a significant amount of vibrations and impact energy owing to the interface power that is generated when it is used. It is of great practical significance to study the influence of the nanochannel structure of hydrophobic silica gel in the CD damping medium on the running speed of the CD. The fractal theory was applied to observe the characteristics of the micropore structure of the hydrophobic silica gel by scanning electron microscopy (SEM), the primary particles were selected to carry out fractal analysis, and the two-dimensional fractal dimension of the pore area and the tortuous fractal dimension of the hydrophobic silica gel pore structure were calculated. The fractal percolation model of water in hydrophobic silica nanochannels based on the slip theory could thus be obtained. This model revealed the relationship between the micropore structure parameters of the silica gel and the running speed of the CD. The CD running speed increases with the addition of grafted molecules and the reduction in pore size of the silica gel particles. Continuous loading velocity testing of the CD loaded with hydrophobic silica gels with different pore structures was conducted. By comparing the experimental results with the calculation results of the fractal percolation model, it was determined that the fractal percolation model can better characterize the change trend of the CD running velocity for the first loading, but the fractal dimension was changed from the second loading, caused by the small amount of water retained in the nanochannel, leading to the failure of fractal characterization.

中文翻译：

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疏水性二氧化硅纳米通道结构对胶体阻尼器运行速度的影响

由于使用时产生的界面功率，胶体阻尼器 (CD) 可以消散大量的振动和冲击能量。研究CD阻尼介质中疏水硅胶的纳米通道结构对CD运行速度的影响具有重要的现实意义。应用分形理论通过扫描电子显微镜（SEM）观察疏水硅胶的微孔结构特征，选取初级粒子进行分形分析，孔面积的二维分形维数和计算了疏水硅胶孔结构的曲折分形维数。由此可以得到基于滑移理论的疏水二氧化硅纳米通道中水的分形渗流模型。该模型揭示了硅胶微孔结构参数与CD运行速度之间的关系。CD 运行速度随着接枝分子的加入和硅胶颗粒孔径的减小而增加。对加载有不同孔结构的疏水硅胶的 CD 进行连续加载速度测试。通过将实验结果与分形渗流模型的计算结果进行比较，确定分形渗流模型可以更好地表征第一次加载时CD运行速度的变化趋势，但分形维数从第二次加载开始发生变化，由于纳米通道中保留了少量水，导致分形表征失败。