Investigating the Relationship between Adhesion Forces and Surface Functionalization Using Atomic Force Microscopy
| Autor: | Kathryn A. Perrine, Mikhail Trought |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
010405 organic chemistry 05 social sciences 050301 education chemistry.chemical_element General Chemistry Adhesion 01 natural sciences 0104 chemical sciences Education Highly oriented pyrolytic graphite Chemical engineering chemistry Phase (matter) Surface roughness Molecule Surface modification Graphite 0503 education Carbon |
| Zdroj: | Journal of Chemical Education. 98:1768-1775 |
| ISSN: | 1938-1328 0021-9584 |
| DOI: | 10.1021/acs.jchemed.0c00558 |
| Popis: | Surface chemistry impacts technology, advancing the development of new heterogeneous catalysts, semiconductor devices, and materials synthesis. Carbon surfaces are ubiquitous in various fields, and the surface reactivity can be altered by surface functionalization on the molecular scale, introducing functional groups, thus shifting their macroscale properties. In this physical chemistry lab experiment, students use atomic force microscopy to investigate the surface of graphite (organic) and gold (inorganic) samples (solid phase) to compare topographical features, surface roughness, and adhesion forces of the samples. Students relate the force–displacement measurements with the Lennard-Jones potential to obtain measurable adhesion forces. Emphasis is placed on quantification of the adhesion forces between a hydrophobic highly oriented pyrolytic graphite (HOPG) surface, a hydrophilic (hydroxy) functionalized HOPG surface, and a metallic gold-coated glass slide. The surface of each sample is explored, allowing students to compare the difference between the hydrophobic and hydrophilic surfaces from surface functionalization. |
| Databáze: | OpenAIRE |
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