The net interaction between a probe tip coated with bovine serum albumin (BSA) protein and a flat substrate coated with poly(ethylene oxide) (PEO) polymer was measured directly on approach in water and electrolyte solutions using AFM. The approach force curve between the two surfaces was monotonically repulsive in water and in electrolyte solutions. At pH ~5, slightly above the isoelectric poin...

Abstract The paper presents analytical approach to electrostatic field for dielectric spheroids problem. For both oblate and prolate fields distributions are derived. variable separation method is applied. Electrostatic force evaluated with the help of Maxwell stress tensor generalized method, material density, coenergy equivalent dipole. Levitation forces versus axis permittivities height pres...

Numerical solutions of the Poisson-Boltzmann equation (PBE) have found wide application in the computation of electrostatic energies of hydrated molecules, including biological macromolecules. However, solving the PBE for electrostatic forces has proved more difficult, largely because of the challenge of computing the pressures exerted by a high dielectric aqueous solvent on the solute surface....