Electrostatic separator polystyrene

At present, a wide range of solid substrates are available for protein immobilization. According to the protein attachment strategies, namely, adsorption, affinity binding, and covalent binding, all these substrates can be separated into three main parts. Surfaces like ploy(vinylidene fluoride) (PVDF), poly(dimethylsiloxane) (PDMS), nitrocellulose, polystyrene, and poly-1-lysine coated glass can adsorb proteins by electrostatic or hydrophobic forces. A potential drawback of such substrates is the difficulty... 

Third, dilute phases can be regarded as one-dimensional colloidal suspensions of sheets in analogy to the familiar three-dimensional suspensions of charged polystyrene spheres (e.g. polyballs). We shall see that the Poisson-Boltzmann equation in one-dimension accurately describes the intermembrane interactions for phases where the dilution is a consequence of long range electrostatic repulsion (rather than undulation forces). This happens when charged sheets are separated by water containing only the counter-ions. 

In order to produce a hydrophilic adsorbent from a polystyrene core it is necessary to shield the hydrophobic polymer backbone. One approach reported by Rounds et al. [15] involves electrostatic adsorption of a polyamine onto the surface of sulphonated, microparticulate polystyrene. This adsorbed layer is cross-linked into position and subsequently quaternised. The performance of this material was comparable with that of commercially available packings for the separation of biological macromolecules. The adsorption and subsequent cross-linking of a neutral, hydro-... 

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