Continuous Optical Measurement of Internal Dynamics in Drying Colloidal Droplets

Autor:	Jose Rafael Guzman-Sepulveda, Ruitao Wu, Aristide Dogariu
Rok vydání:	2021
Předmět:	Materials Chemistry Desiccation Physical and Theoretical Chemistry Phase Transition Surfaces Coatings and Films
Zdroj:	The Journal of Physical Chemistry B. 125:13533-13541
ISSN:	1520-5207 1520-6106
DOI:	10.1021/acs.jpcb.1c07237
Popis:	Accessing the colloidal dynamics non-invasively and continuously during the phase transition of a colloidal system is challenging but critical. Here, we demonstrate the use of spatiotemporal coherence-gated light scattering for studying the internal dynamics of drying colloidal droplets. The continuously acquired signal originates from a picoliter-sized volume located at the droplet-substrate interface. The measurement is non-contact, non-invasive, and label free and permits real-time observations of both optical and mechanical changes in the measurement volume. Additionally, some macroscopic descriptors of the drying process can be constructed from the microscopic measurement, providing ample information of the process. Implemented with an endoscopic-like probe, this system can be easily incorporated into the existing drop profiling instruments, which is potential for the full characterization of dynamic colloidal droplets.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::904a05e6c3705023004de4614ec2a706 https://doi.org/10.1021/acs.jpcb.1c07237 Zobrazit plný text záznamu