The Numerical Study Of The Adsorption Of Bi-disperse Flexible Polyelectrolytes Onto The Surface Of Two Charged Objects

The adsorption of polyelectrolytes（PEs）on the surface of charged nano-objects is aimportant scientific problem. Polyelectrolyte adsorption has been applied in industries andbiotechnology. The continuum self-consistent-field (SCFT) is employed to study the adsorption ofbi-disperse flexible polyelectrolytes (PEs) onto the surfaces of two chargedobjects. The detailed contents are as follows:1. The research status of polyelectrolyte adsorption, polymer polydispersity and scalingtheory are briefly introduced. The numerical method of solving the self-consistentequations is also discussed.2. The effects of the bi-dispersity in terms of the average volume fractions and chain lengthsof two kinds of chemically identical and charged homo-polymers on the total amount ofabsorbed PE chains, the degree of charge compensation, and the total amount of thebridging chain conformation are investigated. The numerical study reveals that the longerPE chains are more effective in charge compensating the opposite surface charges. Thelarger the relative chain length difference is, the more effective the longer PE chains incharge compensating the surface charges will be.3. In the bi-disperse polyelectrolytes(PEs) solution, the effect of addition of salt onthe PE-adsorption behaviors is examined. The numerical results show differentdegrees of sensitivity of PE-adsorption to the screening-reduced salt effect for the longerPE chains and the shorter one.4. In the mono-disperse PE system, how the dielectric contrast of the non-polar PE chains, thecharged objects with respect to the polar solvent molecules impacts the adsorptionbehaviors of mono-disperse PE chains is examined. The numerical study reveals that thedielectric contrast inhibits PE adsorption.