Studying Interfaces with Neutron Reflectometry

This event is hosted by Duncan Bruce (duncan.bruce@york.ac.uk) and John Slattery (john.slattery@york.ac.uk).

Neutron reflectometry (NR) is an advanced analytical technique that provides high-resolution insights into the structure and composition of thin films and interfaces at the nanoscale. This presentation will explain the basic principles of neutron reflectometry and highlight its application in addressing critical questions in atmospheric science, soft matter, and biology. By measuring the reflectivity of neutrons at varying incident angles, NR allows for the precise determination of layer thickness, density, roughness, and composition in complex multilayer systems.

In atmospheric science, NR has been employed to examine the properties and interactions of atmospheric aerosols, the adsorption of pollutants on environmental surfaces, and the behaviour of thin water and ice films. It enables the detailed study of aerosol particle coatings, revealing their impact on cloud formation and climate forcing. Additionally, NR aids in understanding surface reactions that influence air quality and pollutant behaviour, as well as the interactions at liquid-air and liquid-solid interfaces pertinent to cloud droplets and soil moisture.

Beyond atmospheric science, NR is invaluable in the field of soft matter, where it is used to study polymers, surfactants, and colloidal systems. It provides insights into the arrangement and dynamics of these materials at interfaces, essential for applications in coatings, adhesives, and nanotechnology. In biology, NR contributes to understanding the structure and function of bio-membranes, protein adsorption, and lipid layers, offering crucial information for drug delivery systems and biosensor development.

The non-destructive nature, high sensitivity, and depth profiling capabilities of neutron reflectometry, combined with the potential for isotopic contrast (sensitivity to both light and heavy elements), make it an invaluable tool in interfacial science. This presentation will highlight key findings across atmospheric science, soft matter, and biology achieved through NR, demonstrating its broad applicability and utility in advancing our understanding of complex interfacial phenomena.