Photophoresis of spherical particles in slip-flow regime

Abstract

Photophoresis is a particle-light-induced phenomenon with several applications, such as spectroscopy, 3-Dimensional displays, and nanomanufacturing, to name a few. This work synthesizes, criticizes, and compares the main hydrodynamic and gas-kinetic models developed to quantify photophoretic forces in the slip-flow regime for uniform light beams, contrasting their predictions with experimental data available in the literature. The results comparing the different models evidence the simplicity and accuracy of Loesche and Husmann's model, which is then confronted with the experimental data available in the literature. However, considering the noticeable effect of high irradiance levels on photophoretic forces, namely, when temperature variations significantly change the thermofluid properties of the gaseous layer around the particle, more experiments are recommended to validate theoretical models. Finally, considering the photophoretic models depend on two asymmetry factors, J0 and J1, a physical interpretation of their meaning is provided, especially for the oscillations in the later argued as the result of Mie resonance effects.

New Generation Dielectrophoretic-Based Microfluidic Device for Multi-Type Cell Separation

“…Interpretation of the “electrical signature” of biological cells has been widely recognized during the last decades as a feasible approach in medical application [ 1 ]. Different external stimuli such as electrical field for electrophoresis [ 2 , 3 ] and dielectrophoresis (DEP) [ 4 , 5 , 6 , 7 ], acoustic wave for acoustophoresis [ 8 ], magnetic field for magnetophoresis [ 9 , 10 ], and light beam for photophoresis [ 11 , 12 ] have been used to identify and sort target cells under various experimental conditions. Among them, DEP has become popular in manipulating bioparticles [ 1 , 13 , 14 ].…”