Colloidal Stability of Apolar Nanoparticles: The Role of Particle Size and Ligand Shell Structure

ACS Nano
Thomas KisterTobias Kraus

Abstract

Being able to predict and tune the colloidal stability of nanoparticles is essential for a wide range of applications, yet our ability to do so is currently poor due to a lack of understanding of how they interact with one another. Here, we show that the agglomeration of apolar particles is dominated by either the core or the ligand shell depending on the particle size and materials. We do this by using small-angle X-ray scattering and molecular dynamics simulations to characterize the interaction between hexadecanethiol passivated gold nanoparticles in decane solvent. For smaller particles, the agglomeration temperature and interparticle spacing are determined by ordering of the ligand shell into bundles of aligned ligands that attract one another and interlock. In contrast, the agglomeration of larger particles is driven by van der Waals attraction between the gold cores, which eventually becomes strong enough to compress the ligand shell. Our results provide a microscopic description of the forces that determine the colloidal stability of apolar nanoparticles and explain why classical colloid theory fails.

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Citations

Dec 15, 2020·Nanoscale·Benedicta SherrieLaszlo Frazer
Dec 1, 2020·Journal of Colloid and Interface Science·Takaaki TomaiTadafumi Adschiri
Oct 29, 2020·Nature Communications·Sebastian Franco-UlloaMarco De Vivo
Apr 20, 2021·The Journal of Physical Chemistry. B·Tianyu Yan, Kristen A Fichthorn
May 13, 2021·Chemical Communications : Chem Comm·Suren J NematJonathan De Roo
Jul 3, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Shenqing WangBing Yan
Oct 10, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Debora MonegoTobias Kraus
May 31, 2019·Nano Letters·Sergio MazzottiGiulia Galli
Aug 25, 2020·ACS Nano·Clayton J DahlmanMichael L Chabinyc
Aug 21, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·G Kristin JonssonJohan Bergenholtz
Jun 18, 2020·ACS Applied Materials & Interfaces·Biplab K PatraErik C Garnett
Nov 16, 2021·Nanoscale·Mahsa Parvizian, Jonathan De Roo

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