講演情報
[8p-PA1-12]Direct Force Measurement of the Non-reciprocal Interaction of Catalytic TiO2 and Polystyrene under UV Irradiation
Akira Aso1, Sae Saito1, Kiwamu Yoshii1, 〇(M2)MaJohanne Gulmatico Columnas2, Emil Vincent Llanes2, Rahul Marate3, Yutaka Sumino1, Mark Nolan Confesor2 (1.Department of Applied Physics, Tokyo University of Science, Japan, 2.Department of Physics and Complex Systems Research Center, Mindanao State University-Illigan Institute of Technology, Philippines, 3.Indian Institute of Technology Delhi, India)
キーワード：
Optical tweezer、Photocatalytic colloids、Stoke's law
Catalytic colloids generate chemical fields that translate into mechanical forces, inducing asymmetric particle interactions [1] [2]. This work quantifies these forces by trapping probe particles via optical tweezer Hookean force measurement and measuring velocity profiles toward chemical fields via Stokes' law. From a synthesized system made of micrometer-sized silica particles coated with Titanium dioxide (TiO2) being dispersed in a 3% Hydrogen peroxide (H2O2) solution, the polystyrene beads (PBs) interacting with the immobilized TiO2 showed transient attractive dynamics when irradiated with UV. We found that photocatalytic forces on probe beads follow an inverse square law relative to the distance from the TiO2 center. This can be significant for further understanding of emergent behaviors in biological and synthetic systems.
References
[1] M. N. Popescu et al., Acc. Chem. Res., 2982-2991 (51) 2018.
[2] M. Reisenbauer et al., Nat. Phys., 1629 (20) 2024.
References
[1] M. N. Popescu et al., Acc. Chem. Res., 2982-2991 (51) 2018.
[2] M. Reisenbauer et al., Nat. Phys., 1629 (20) 2024.