Abstract：
Porous hybrid microparticles are characterized by their densities and porosities. Consequently, the evaluation for density and porosity of porous hybrid microparticles in liquids is crucial for predicting the transport of particles in the atmosphere, human body, and industrial processes. However, direct measurement of the density and porosity of porous hybrid microparticles in liquids remains a challenge. In this study, we investigated the centrifugal sedimentation of polystyrene-silica hybrid microparticles with and without gas-containing closed pores. A centrifugal liquid sedimentation-dynamic light scattering combined analytical method was employed to determine the apparent densities of hybrid microparticles with and without gas-containing closed pores. The porosity of the hybrid microparticles with gas-containing closed pores was elucidated based on the inner buoyancy, which is a centrifugal force generated by the presence of low-density gas inside numerous closed pores. Further, the inner gas buoyancy was analyzed to estimate the particle porosity in liquids. The results obtained in this study confirmed the feasibility of utilizing the proposed method to determine the apparent density and porosity of porous hybrid microparticles in liquids.
摘要：
多孔混合微粒的特征在于它们的密度和孔隙率。因此,液体中多孔混合微粒的密度和孔隙率的评估对于预测大气中颗粒的传输至关重要，人体,和工业过程。然而,直接测量液体中多孔混合微粒的密度和孔隙率仍然是一个挑战。在这项研究中,我们研究了有和没有含有气体的闭孔的聚苯乙烯-二氧化硅杂化微粒的离心沉降。采用离心液体沉降-动态光散射组合分析方法来确定有和没有含气闭孔的混合微粒的表观密度。基于内部浮力，阐明了具有含气体闭孔的混合微粒的孔隙率，这是由于低密度气体在许多封闭孔隙内的存在而产生的离心力。Further,分析了内部气体浮力，以估计液体中的颗粒孔隙率。在这项研究中获得的结果证实了利用所提出的方法来确定液体中多孔杂化微粒的表观密度和孔隙率的可行性。
