Real time monitoring of the minute dynamic variation at the crude oil–water interface
Literature Information
Ziling Ding, Yan Xiong
Quantitative recording of the minute dynamic variation at an oil–water interface is always a great challenge. Dual polarization interferometry (DPI) presents an approach in monitoring the variations of mass, thickness, and density at the interface with high resolution. In this study, a planar crude oil–water interface was established by spin-coating on a DPI chip surface. Different concentrations of sodium dodecyl sulphate (SDS) and polyacrylamide (PAM) were injected into the interface. The absorption of free SDS molecules, in low concentrations, can be interpreted as a two-step absorption. With the existence of micelles in higher concentrations, the crude oil molecules tend to be taken away by the micelles. The absorptions of the polymers at the interface are different from SDS. The crude oil can hardly be taken away by the polymers. Instead, the hydrophobic segments of polymers insert into the oil film and hydrophilic groups stretch into the solution.
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Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.













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