Itamar Borukhov

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The adsorption of large ions from solution to a charged surface is investigated theoretically. A generalized Poisson-Boltzmann equation which takes into account the finite size of the ions is presented. We obtain analytical expressions for the electrostatic potential and ion concentrations at the surface, leading to a modified Grahame equation. At high(More)
The behavior of electrolyte solutions close to a charged surface is studied theoretically. A modified Poisson–Boltzmann equation that takes into account the volume excluded by the ions in addition to the electrostatic interactions is presented. In a formal lattice gas formalism the modified Poisson–Boltzmann equation can be obtained from a mean-field(More)
Titration of methacrylic acid/ethyl acrylate copolymers is studied experimentally and theoretically. At low salt concentrations, this polyacid exhibits a plateau in the titration curve below the neutralization point. The plateau has often been attributed to a first-order phase transition associated with polymer conformational changes. We argue that the(More)
The e ect of charged polymers on the interactions between charged surfaces in solution is investigated theoretically. We use meaneld theory to derive a self-consistent eld equation for the polymer order parameter, and a modi ed Poisson–Boltzmann equation for the electrostatic potential. The two di erential equations together with the appropriate boundary(More)
We put forward a theoretical model for the morphological transitions of templated mesoporous materials. These materials consist of a mixture of surfactant molecules and inorganic compounds which evolve dynamically upon mixing to form different morphologies depending on the composition and conditions at which mixing occurs. Our theoretical analysis is based(More)
Motivated by recent attempts to confine biochemical processes inside water-in-oil microemulsions, we studied the composition and stability of mixed-amphiphile water-swollen micelles in oil from a theoretical point of view. A novel adsorption model demonstrates how the micellar contents (DNA, proteins, etc.) can dramatically affect the composition of the(More)
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