Direct mapping of the solid-liquid adhesion energy with subnanometre resolution.
Solid-liquid interfaces play a fundamental role in surface electrochemistry, catalysis, wetting, self-assembly and biomolecular functions. The interfacial energy determines many of the properties of such interfaces, including the arrangement of the liquid molecules at the surface of the solid. Diffraction techniques are often used to investigate the structure of solid-liquid interfaces, but measurements of irregular or inhomogeneous interfaces remain challenging. Here, we report atomic- and molecular-resolution images of various organic and inorganic samples in liquids, obtained with a commercial atomic force microscope operated dynamically with small-amplitude modulation. This approach uses the structured liquid layers close to the solid to enhance lateral resolution. We propose a model to explain the mechanism dominating the image formation, and show that the energy dissipated during this process is related to the interfacial energy through a readily achievable calibration curve. Our topographic images and interfacial energy maps could provide insights into important interfaces.
Voïtchovsky
Kislon
K
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA. kvoitcho@mit.edu
Kuna
Jeffrey J
JJ
Contera
Sonia Antoranz
SA
Tosatti
Erio
E
Stellacci
Francesco
F
D000268:Adhesiveness; D000538:Aluminum Silicates / Q000737:chemistry; D004121:Dimethyl Sulfoxide / Q000737:chemistry; D016014:Linear Models; D018625:Microscopy, Atomic Force / Q000379:methods*; D049329:Nanostructures / Q000737:chemistry*; D036103:Nanotechnology / Q000379:methods*; D013499:Surface Properties; D013816:Thermodynamics; D014867:Water / Q000737:chemistry
D000538:Aluminum Silicates; D014867:Water; C011934:mica; D004121:Dimethyl Sulfoxide