2011
DOI: 10.1021/jp2061738
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Diffusion of Nanoparticles at an Air/Water Interface Is Not Invariant under a Reversal of the Particle Charge

Abstract: The diffusion of charged nanoparticles at an aqueous/air interface is not invariant under a charge reversal of the particles. Negatively charged particles slow down with the ionic strength of the aqueous phase, while positively charged particles speed up. The diffusion constant of the particles reflects their immersion into the aqueous/air interface. We argue that the opposing behavior of oppositely charged particles is proof that the immersion depth of the particles scales with the contrast in electric surfac… Show more

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Cited by 20 publications
(37 citation statements)
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“…32 We measured the drift velocities by studying the diffusion of passive silica beads for the same fuel concentrations used for Janus particles. 32 We measured the drift velocities by studying the diffusion of passive silica beads for the same fuel concentrations used for Janus particles.…”
Section: Figurementioning
confidence: 99%
“…32 We measured the drift velocities by studying the diffusion of passive silica beads for the same fuel concentrations used for Janus particles. 32 We measured the drift velocities by studying the diffusion of passive silica beads for the same fuel concentrations used for Janus particles.…”
Section: Figurementioning
confidence: 99%
“…This interplay is also reflected in the apparent surface charge densities at the air-exposed region, for which we obtain according to eqn (29) s app a = 3.6 nC cm À2 (left) and s app a = 5.9 nC cm À2 (right). We can thus state that, according to eqn (30), the E3200 charges attached to the water-exposed region of the particle cause an increase in the number of apparent charges on the air-exposed particle region from zero to 3.6 for the left diagram in Fig. 5 and from 3.2 to 5.9 for the right diagram in Fig.…”
Section: Soft Matter Papermentioning
confidence: 90%
“…The potential difference likely reflects both the adsorption of ions (OH À versus H + ) and the dipole potential from interfaceinduced water ordering. The magnitude and sign have been a matter of debate, 27,28 but a change from a more negative potential in the air to a more positive potential in bulk water finds wide experimental 29,30 and some computational 31 support.…”
Section: Theorymentioning
confidence: 99%
“…53 There is a growing interest to investigate the nano/bio interface to understand the diffusion dynamics, and chemical and biological effects of nanoparticles in cells. 46, 54-56 Inherently, CARS is a four-wave mixing processes that is sensitive to the large susceptibility of metal nanoparticles, 57-60 and may prove to be a valuable tool for observing molecular interactions of functionalized nanoparticles in biological systems.…”
Section: Discussionmentioning
confidence: 99%