Surface science

Surface science is the study of what happens when different kinds of materials meet, like when a solid touches a liquid, a solid meets the air, or a solid is exposed to empty space. This includes looking at both the chemical and physical changes that occur at these meeting points.

This science helps us understand many important things, like how fuels can be used more efficiently in fuel cells, how tiny parts are made in semiconductor devices, and why some materials stick together so well, like adhesives. It also looks at special layers that form on their own, called self-assembled monolayers, and how different substances work together in processes called heterogeneous catalysis.

Surface science is closely connected to the study of interfaces and colloids, which looks at bigger changes that happen when different materials come together. While the methods used are different, both areas share an interest in what happens at the boundaries between different kinds of matter.

History

Surface science began with a woman named Agnes Pockels, who studied how liquids behave on surfaces. Even though she was not allowed to use university labs, her work helped scientists understand more about these interactions. Later, other scientists like Paul Sabatier and Fritz Haber made important discoveries in changing gases into liquids. Irving Langmuir also helped start this field, and a science journal is named after him. In 1974, Gerhard Ertl showed how hydrogen sticks to a metal called palladium using a special method. His work helped us learn more about how different materials interact on surfaces.

Chemistry

Surface chemistry looks at how chemical reactions happen where two different things meet, like where a solid touches a liquid or a gas. This helps us understand important areas like making better catalysts, studying electricity in liquids, and how rocks interact with water.

In catalysis, tiny particles stick to surfaces, which helps speed up important reactions. Scientists use special tools to study these tiny particles on clean, flat surfaces to learn how they work. In electrochemistry, we study how electricity moves between solids and liquids, watching how tiny parts behave at the meeting point. Finally, in geochemistry, scientists study how rocks and minerals interact with water, which helps us understand how pollution moves through soil and how natural processes work.

Physics

Surface physics studies how things interact at the meeting point of different materials. This area looks at how surfaces work and change. Scientists study topics like how surfaces rub together, how tiny parts move on surfaces, and how surfaces change their shape. They also look at how very small pieces of energy move on surfaces and how tiny structures build themselves. To learn more, scientists use special tools like microscopes that scan surfaces and methods that shine light on surfaces to see their details.

Analysis techniques

Scientists use many tools to study surfaces. Some tools look at the top few tiny parts of a surface, like angle-resolved photoemission spectroscopy, X-ray photoelectron spectroscopy, and Auger electron spectroscopy. These often need a very empty space, called vacuum, to work well.

Other tools, like surface-enhanced Raman spectroscopy and multi-parametric surface plasmon resonance, can study surfaces under many different conditions. There are also ways to use sound and X-rays to learn more about how surfaces look and behave. Tools like scanning-tunneling microscopy and atomic force microscopy let scientists see very small details on surfaces.