Nature frequently uses charged, weak-polyelectrolyte brushes at interfaces to control surface function and properties; surface wetting, lubrication, to limit deposition of macromolecules (polysaccharides, proteins) onto natural surfaces, or to aid in surface wetting in the cartilage in joints or the surfaces of lung tissue. Charge controls adsorption of molecules, enables attachment of specific molecules and for living cell surfaces greatly influences binding on these surfaces. Synthetic polymer brushes are important as interfaces that bridge materials and biological environments such as stimuli responsive surfaces, drug delivery, surfaces for cell growth and for bio-separation. This proposal will use the unique features of neutrons to see the shape of the brush molecules by looking at right angles to the surface and pushing the information off the directly scattered beam,