The division of bacteria is controlled by the binding of proteins to the inner of the two lipid bilayer membranes that separates the inside of the cell from the outside world. This membrane behaves like a capacitor and its properties are thought to vary with the size of the electrical potential that exists across it. We can construct a flat model for this membrane above a gold-coated silicon block and use the reflection of neutrons from this thin film to probe the details of the structure of the membrane and how this changes with an applied electrical potential and when the anchoring peptide of the cell division protein inserts into the membrane. From this information we hope to understand if the insertion of this protein is controlled by the electrical potential, which can be related to metabolic state of actual bacteria. In the long term this may help to control bacterial infection.