A colloidal suspension of active Brownian particles (ABPs) driven by controllable forces into directed or persistent motions can serve as a model for understanding the biological systems. Such persistent motions generate non-thermal fluctuation that behaves differently from thermal fluctuation. 1-D position histograms of an active particle in a quadratic potential well reveal a splitting from a single peak of the ABP's positional distribution to a bimodal distribution. However, non-thermal and thermal fluctuations coexist. Decoupling the non-thermal from the thermal contributions to the overall histogram is non-trivial because the overall histogram is a convolution of the two contributions. If the thermal fluctuation can be determined independently, we show deconvolution or denoise algorisms can be used to extract the active fluctuation from the overall histogram. The talk will report the use of a single, induced-charge electrophoretic (ICEP) metallic Janus particle, confined in a quadratic potential well as a model ABP system to test our deconvolution method. The non-thermal fluctuations reveal physical parameters of the ABPs, including the ballistic speed, and the propelling force.

Extract non-thermal fluctuation of active colloid particles in a quadratic potential well by deconvolution

Macromolecular Chemistry: The Second Century

[Author Benefits](https://scimeetings.acs.org/?utm_source=pubs_content_marketing&utm_medium=website&utm_campaign=0320_MCF_NPI_Launch_Spring_Homepage&ref=pubs_content_marketing)

[How to use SciMeetings](https://storage.googleapis.com/dl.morressier.com/acs/SciMeetings-ACSSpring2020-HowToGuide_M3020-Final.pdf)

[Frequently Asked Questions](https://storage.googleapis.com/dl.morressier.com/acs/SciMtng_ACSNMSp2020_FAQ_M3120_Final.pdf)

ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.