Density and porosity analyses of porous hybrid microparticles containing gas in closed pores using centrifugal liquid sedimentation–dynamic light scattering combined analytical method

IF 1.8 4区化学 Q3 CHEMISTRY, ANALYTICAL

Analytical Sciences Pub Date : 2024-06-24 DOI:10.1007/s44211-024-00623-6

Tetsuji Yamaguchi, Tetsuya Yamamoto

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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.

Graphical abstract

Abstract Image

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利用离心液相沉降-动态光散射联合分析法分析封闭孔隙中含有气体的多孔混合微粒的密度和孔隙率。

多孔混合微粒以其密度和孔隙率为特征。因此，评估液体中多孔混合微颗粒的密度和孔隙率对于预测颗粒在大气、人体和工业过程中的传输至关重要。然而，直接测量液体中多孔混合微颗粒的密度和孔隙率仍然是一项挑战。在这项研究中，我们研究了聚苯乙烯-二氧化硅混合微颗粒的离心沉降，包括含气封闭孔和不含气封闭孔。我们采用离心液体沉降-动态光散射联合分析方法测定了含气和不含气闭孔混合微颗粒的表观密度。根据内浮力阐明了含气闭孔混合微粒的孔隙率，内浮力是由众多闭孔内存在的低密度气体产生的离心力。此外，还分析了内气体浮力，以估算液体中的颗粒孔隙率。这项研究获得的结果证实了利用拟议方法测定液体中多孔混合微粒表观密度和孔隙率的可行性。

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来源期刊

Analytical Sciences 化学-分析化学

CiteScore

2.90

自引率

18.80%

发文量

232

审稿时长

1 months

期刊介绍： Analytical Sciences is an international journal published monthly by The Japan Society for Analytical Chemistry. The journal publishes papers on all aspects of the theory and practice of analytical sciences, including fundamental and applied, inorganic and organic, wet chemical and instrumental methods. This publication is supported in part by the Grant-in-Aid for Publication of Scientific Research Result of the Japanese Ministry of Education, Culture, Sports, Science and Technology.