Friction and adhesion of mixed self-assembled monolayers studied by chemical force microscopy

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Publication Date
DOI 10.1039/A809994D
Impact Factor 3.676
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Abstract

Using a scanning force microscope with tips functionalised by deposition of a self-assembled monolayer (chemical force microscopy), the frictional and adhesive characteristics of mixed self-assembled monolayers, formed by the co-adsorption of methyl and carboxylic acid terminated alkanethiols onto gold surfaces, have been measured. A very close correlation has been found between the friction coefficient measurements and the cosines of the advancing water contact angles of the mixed monolayers, indicating that the friction force is in this case proportional to the surface energy. The adhesion force was also found to increase with the proportion of acid-terminated adsorbates in the monolayer, but the correlation was much less close than was the case for the friction force measurements. The degree of uncertainty in the friction coefficient determinations was significantly smaller than that in the adhesion force measurements, and the magnitude of the change was much greater on increasing the mole fraction of the polar adsorbate from 0 to 1.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
Articles per Year: 3036

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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