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Origin and Control of Kinetic and Thermodynamic Hysteresis in Clustering of Gold Nanoparticles

preprint
submitted on 05.06.2020 and posted on 05.06.2020 by Joscha Kruse, Stefan Merkens, Andrey Chuvilin, Marek Grzelczak
Hysteresis is an essential attribute of many solid-state devices and biological processes, yet it is often overlooked in colloidal and soft-matter dynamic systems. Herein we show that gold nanoparticles can remain dispersed or aggregated at the same temperature depending on the trajectory of applied stimulus, featuring hysteretic behaviour. Aided by real-time analytics and fine tuning of experimental parameters, such as salt concentration, nanoparticle diameter and surface potential, we disentangled kinetic (rate-dependent) and thermodynamic (rate-independent) component of hysteresis in cyclic clustering of nanoparticles. The hysteresis originates from the difference in the aggregation and disassembly temperatures. Our findings enrich the repertoire of experimental framework suitable for study life-like features on purely synthetic settings.

Funding

Basque Government (PIBA 2018-34, RIS3 201822203, PRE-2019-1-0239)

Diputacion Foral de Gipuzkoa (RED2018, RED2019)

Spanish MINECO under the Maria de Maeztu Units of Excellence Program (MDM-2016-0618)

History

Email Address of Submitting Author

marek.g@csic.es

Institution

Centro de Fisica de Materiales, CSIC-UPV/EHU and Donostia International Physics Center DIPC

Country

Spain

ORCID For Submitting Author

0000-0002-3458-8450

Declaration of Conflict of Interest

The authors declare no conflict of interest

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