Abstract
Thorough understanding of the behaviour of core–shell microparticles with a liquid core is essential for determining their performance in applications under different operation conditions. This paper reports the behaviour of core–shell particles with a liquid core under thermal and mechanical loads. First, we formulated an analytical model for the heating process of a core–shell microparticle with a liquid core. Next, we utilised an axisymmetric model of an elastic spherical shell upon compression to describe the deformation of a core–shell microparticle. Finally, we conducted experiments to validate these models. Both thermal and mechanical models agree well with the experimental data. The maximum temperature a core–shell microparticle can withstand depends on the liquid, the geometry, and the material of the shell. The critical compression force before rupture of a core–shell microparticle depends on the Poisson’s ratio of the shell material and the shell thickness relative to the outer shell radius. The rupture force and rupture temperature increase with increasing shell thickness.
Highlights
Core-shell microparticles have attracted increasing attention from the research community due to the relatively simple manipulation, versatile choice of materials, and modifiable surface properties, as well as their broad range of applications in biomedicine, biotechnology, and chemistry [1]
This paper reports the behaviour of core-shell particles with a liquid core under thermal and mechanical loads
We first investigated the thermal behaviour of the core-shell microparticles experimentally by increasing the temperature and monitoring their response
Summary
Core-shell microparticles have attracted increasing attention from the research community due to the relatively simple manipulation, versatile choice of materials, and modifiable surface properties, as well as their broad range of applications in biomedicine, biotechnology, and chemistry [1]. For simplification and ease of presentation, the following assumptions were made for the model: (i) The shell thickness of a core-shell particle remains constant and no curvature or slope occurs during the heating process; (ii) The core is located at the centre of the particle; (iii) Both core and shell are spherical an maintain this shape during the heating process; (iv) The volume of the rigid shell remains unchanged during the heating process; (v) Temperature distribution is uniform throughout the shell layer and the core; (vi) Pressure is uniformly distributed over the inner wall of the shell and change gradually with temperature; (v) The liquid encapsulated inside the shell is considered homogeneous and in a thermodynamic equilibrium states; and (vi) The liquid core is assumed to be in a single-phase before the rupture of theshell. Where a and b are the inner and outer radii of the shell, respectively
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