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Colloidal Assembly of Polydisperse Particle Blends during drying

Dong, Yichen, Bussato, Nicolas, Roth, Peter and Martin-Fabiani, Ignacio (2020) Colloidal Assembly of Polydisperse Particle Blends during drying Soft Matter.

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Dong et al. Polydisperse blends -Final-Revised.docx - Accepted version Manuscript
Restricted to Repository staff only until 12 August 2021.

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In this work, we synthesize a polydisperse aqueous colloidal system composed of small and large zwitterionic particles, as well as medium sized standard acrylic particles. By assembling these dispersions into films by drying, we show using atomic force microscopy (AFM) how their top surfaces can be mostly covered by zwitterionic groups for a wide range of evaporation rates. We probe underneath the top film surface using Fourier-transform infrared (FTIR) spectroscopy - attenuated total reflection (ATR), observing that the content in zwitterionic particles of the film upper layer increases for faster evaporation rates. We show how polydisperse systems hold great potential to overcome the evaporation rate dependence of size segregation processes in drying colloidal blends, and we provide further insights into the assembly mechanisms involved. Polydisperse blends enhance the robustness of such processes for application in coatings and other soft products where evaporation rate can not be tuned.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Chemistry
Authors :
Dong, Yichen
Bussato, Nicolas
Martin-Fabiani, Ignacio
Date : 11 August 2020
Additional Information : Embargo OK Metadata Pending
Depositing User : James Marshall
Date Deposited : 18 Aug 2020 09:45
Last Modified : 18 Aug 2020 09:45

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