Particle Deposition to Silica Surfaces Functionalized with Cationic Polyelectrolytes

Positively charged water-solid interfaces are prepared by adsorption of a cationic polyelectrolyte poly(diallyldimethylammonium chloride) (PDADMAC) from aqueous solutions to planar silica substrates. These substrates are characterized by atomic force microscopy (AFM), optical reflectivity, and strea...

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Bibliographic Details
Published in:Colloids and interfaces 2021-06, Vol.5 (2), p.26
Main Authors: Kosior, Dominik, Maroni, Plinio, Borkovec, Michal
Format: Article
Language:English
Subjects:
Adsorption
Aqueous solutions
Atomic force microscopy
Cations
deposition
Latex
Microscopy
Nanoparticles
particle
Particle deposition
polyelectrolyte
Polyelectrolytes
Reflectance
Silicon
Silicon dioxide
Substrates
Surface charge
Surface chemistry
water-solid interface
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Summary:Positively charged water-solid interfaces are prepared by adsorption of a cationic polyelectrolyte poly(diallyldimethylammonium chloride) (PDADMAC) from aqueous solutions to planar silica substrates. These substrates are characterized by atomic force microscopy (AFM), optical reflectivity, and streaming current measurements. By tuning the amount of adsorbed polyelectrolyte, the surface charge of the substrate can be systematically varied. These substrates are further used to study deposition of sulfate latex nanoparticles, which is also accomplished by optical reflectivity. This deposition process is found to be consistent with an extension of the random sequential adsorption (RSA) model in a semi-quantitative fashion. Such deposition studies were further used to ascertain that the substrates obtained by in situ and ex situ functionalization behave in an identical fashion.
ISSN:2504-5377
2504-5377
DOI:10.3390/colloids5020026