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Dynamics of Active SiO₂-Pt Janus Colloids in Dilute Poly(ethylene oxide) Solutions.

ABSTRACT: Self-propelled Janus colloids (JCs) have recently gained much attention due to their ability to move autonomously and mimic biological microswimmers. This ability makes them suitable for prospective drug/cargo-delivery applications in microscopic domains. Understanding their dynamics in surroundings doped with macromolecules such as polymers is crucial, as most of the target application media are complex in nature. In this study, we investigate the self-diffusiophoretic motion of hydrogen peroxide-fuelled SiO₂-Pt JCs in the presence of dilute amounts of poly(ethylene oxide) (PEO). Despite the addition of PEO chains producing a Newtonian behavior with negligible increase in viscosity, the ballistic movement and rotational fluctuations of active JCs are observed to be significantly suppressed. With an increase in the polymer concentration, this leads to a transition from smooth to jittery to cage-hopping to the arrested motion of active JCs. We further propose that the anisotropic interaction of the polymers with the JC increases the "local drag" of the medium, resulting in the unusual impediment of the active motion.

SUBMITTER: Raman H

PROVIDER: S-EPMC10214528 | biostudies-literature | 2023 May

REPOSITORIES: biostudies-literature

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Dynamics of Active SiO<sub>2</sub>-Pt Janus Colloids in Dilute Poly(ethylene oxide) Solutions.

Raman Harishwar H Das Sneham S Sharma Hrithik H Singh Karnika K Gupta Shruti S Mangal Rahul R

ACS physical chemistry Au 20230125 3

Self-propelled Janus colloids (JCs) have recently gained much attention due to their ability to move autonomously and mimic biological microswimmers. This ability makes them suitable for prospective drug/cargo-delivery applications in microscopic domains. Understanding their dynamics in surroundings doped with macromolecules such as polymers is crucial, as most of the target application media are complex in nature. In this study, we investigate the self-diffusiophoretic motion of hydrogen peroxi ...[more]

PMID: 37249935

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Project description:Deposits formed after evaporation of sessile droplets, containing aqueous solutions of poly(ethylene oxide), on hydrophilic glass substrates were studied experimentally and mathematically as a function of the initial solution concentration. The macrostructure and micro/nanostructures of deposits were studied using stereo microscopy and atomic force microscopy. A model, based on thin-film lubrication theory, was developed to evaluate the deposit macrostructure by estimating the droplet final height. Moreover, the model was extended to evaluate the micro/nanostructure of deposits by estimating the rate of supersaturation development in connection with the driving force of crystallization. Previous studies had only described the macrostructure of poly(ethylene oxide) deposits formed after droplet evaporation, whereas the focus of our study was the deposit micro/nanostructures. Our atomic force microscopy study showed that regions close to the deposit periphery were composed of predominantly semicrystalline micro/nanostructures in the form of out-of-plane lamellae, which require a high driving force of crystallization. However, deposit central areas presented semicrystalline micro/nanostructures in the form of in-plane terraces and spirals, which require a lower driving force of crystallization. Increasing the initial concentration of solutions led to an increase in the lengths and thicknesses of the out-of-plane lamellae at the deposits' periphery and enhanced the tendency to form spirals in the central areas. Our numerical study suggested that the rate of supersaturation development and thus the driving force of crystallization increased from the center toward the periphery of droplets, and the supersaturation rate was lower for solutions with higher initial concentrations at each radius. Therefore, periphery areas of droplets with lower initial concentrations were suitable for the formation of micro/nanostructures which require higher driving forces, whereas central areas of droplets with higher initial concentration were desirable for the formation of micro/nanostructures which require lower driving forces. These numerical results were in good qualitative agreement with the experimental findings.

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Dynamics of Active SiO₂-Pt Janus Colloids in Dilute Poly(ethylene oxide) Solutions.

Publications

Dynamics of Active SiO<sub>2</sub>-Pt Janus Colloids in Dilute Poly(ethylene oxide) Solutions.

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Dynamics of Active SiO2-Pt Janus Colloids in Dilute Poly(ethylene oxide) Solutions.

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Dynamics of Active SiO<sub>2</sub>-Pt Janus Colloids in Dilute Poly(ethylene oxide) Solutions.

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OmicsDI is part of the ELIXIR infrastructure

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Dynamics of Active SiO₂-Pt Janus Colloids in Dilute Poly(ethylene oxide) Solutions.