Multiwalled Carbon Nanotube Deposition on Model Environmental Surfaces

Abstract

Deposition of multiwalled carbon nanotubes (MWNTs) on model environmental surfaces was investigated using a quartz crystal microbalance with dissipation monitoring (QCM-D). Deposition behaviors of MWNTs on positively and negatively charged surfaces were in good agreement with Derjaguin-Landau-Verwey-Overbeek (DLVO) theory, although hydrophobic interactions dominated MWNTs deposition on a hydrophobic polystyrene surface. Initial deposition rates (rf) and deposition attachment efficiencies (αD) depended on solution ionic strengths (IS) and surface electrostatic properties. Identical rf and αD values at constant IS on similar surfaces suggested that deposition was insensitive to surface morphology (i.e., bare crystal surface vs coated surface). The dissipation unit (D) was used with frequency (f) to investigate nanoparticle deposition: |ΔD/Δf| values varied for deposition on different surfaces, indicating that the nature of MWNT association with surfaces varied despite constant rf and αD values.

Pentiptycene Polymer/Single-Walled Carbon Nanotube Complexes: Applications in Benzene, Toluene, and o-Xylene Detection

“…In order to differentiate the signals between BTX vapors, we herein make use of a characteristic value derived from −Δ F 3 /Δ D 3 , which has been used to study the contact mechanics of biomolecules, microbes, − and nanomaterials , with substrate surfaces. As illustrated in Figure a, the absolute magnitudes of Δ F 3 and Δ D 3 of the P1 /SG65i-coated electrode increase with rising analyte concentration.…”

QCM-D study of nanoparticle interactions

“…They also reported a notable impact of both the IS and valence of ions on interactions of GO with different QCM-D sensor [117]. The observed deposition of carbon-based nanoparticles could be well explained with the classical DLVO theory [118]. In a natural…”

Heteroaggregation of multiwalled carbon nanotubes with sediments

“…Studies have investigated the effects of dispersion media (Lisetski et al, 2011) and aqueous solution parameters, primarily ionic strength and dissolved organic carbon (DOC) concentration, on CNT aggregation state (Hyung et al, 2007;Saleh et al, 2008;Bouchard et al, 2012) and deposition on model surfaces (Yi and Chen, 2011;Chang and Bouchard, 2013). General conclusions from these studies are that CNT aggregation follows Derjaguin-Landau-Verwey-Overbeek (DLVO) theory (Overbeek, 1999) and that dispersed CNTs may be quite stable at ionic strengths commonly observed in fresh waters, particularly at high DOC concentrations.…”