Two-Step Adsorption of a Switchable Tertiary Amine Surfactant Measured Using a Quartz Crystal Microbalance with Dissipation

Abstract

The adsorption of a switchable cationic surfactant, N,N,N′-trimethyl-N′-tallow-1,3-diaminopropane (DTTM, Duomeen TTM), at the silica/aqueous solution interface is characterized using a quartz crystal microbalance with dissipation (QCM-D). The adsorption isotherms reveal that changes in the solution pH or salinity affect surfactant adsorption in competing ways. In particular, the combination of the degree of protonation of the surfactant and electrostatic interactions is responsible for surfactant adsorption. The kinetics of adsorption is carefully measured using the real-time measurement of a QCM-D, allowing us to fit the experimental data with analytical models. At pH values of 3 and 5, where the DTTM is protonated, DTTM exhibits two-step adsorption. This is representative of a fast step in which the surfactant molecules are adsorbed with head-groups orientated toward the surface, followed by a slower second step corresponding to formation of interfacial surfactant aggregates on the silica surface.

Formation and Stability of Nontoxic Perovskite Precursor

“…Therefore, in some cases, the deposited mass cannot be settled only by measuring frequency. The dissipation shift (Δ D ) indicates the energy loss in a system because of shear stress resulting from high viscosity of the solution or the mass attached to the crystal surface. , It was illustrated that the value of Δ D increases as the adsorption proceeds during the measurements, which shows energy loss due to mass deposition on the crystal surface. Thereby, the measurement of ΔD can be a more reliable parameter than the measurements of Δf depending on the examined case. , …”

Control of the Colloidal and Adsorption Behaviors of Chitin Nanocrystals and an Oppositely Charged Surfactant at Solid, Liquid, and Gas Interfaces

“…A Langmuir adsorption isotherm was observed at low SDS concentrations (0.1–1 mM) (see the fit to adsorption kinetics in Figures S1 and S2, and Table S1). , In this case, surfactant molecules adsorbed on the ChNC surface as a monolayer or a patchy monolayer. The negligible change in dissipation shift confirmed a thin, nondissipative adsorbed layer.…”

pH-responsive viscoelastic supramolecular viscosifiers based on dynamic complexation of zwitterionic octadecylamidopropyl betaine and triamine for hydraulic fracturing applications

“…Similar pH-responsive behavior for complexes involving other types of carboxylic acids and amines have been reported in past studies. [49][50][51] Briey, the charge of OAPB and DTA depends on the pH of the solution and the electrostatic attraction between them occurs once opposing charges appear on them at the same time. At low pH, the DTA protonated (+3 or +2) to combined with the deprotonated OAPB to form more ordered orientation and become tightly-packed.…”