Multichain adsorption

The height /f increases linearly with the number of monomers N per chain at constant grafting density. The stretching energy per chain chain in the grafting layer is A T times the number of correlation blobs per chain  

The stretching energy per unit volume in the brush is balanced by the interchain repulsive energy per unit volume, which is proportional to the osmotic pressure in the layer  

The Alexander - de Gennes approximation assumes that the chains are uniformly stretched, with the free end of each chain located at the top of the brush at height H from the surface. The density profile of the Alexander - de Gennes brush is a step function  

Crowded cfaainsmear the surface repel each other, limiting other chains  

The adsorption blob size decreases with increasing surface attraction 6 as for exponent i/ = 0.588. 

---

Consider multichain adsorption in a 0-solvent, of dilute chains with AT monomers of size b, and with monomer surface interaction of 6kT. Calculate the density profile of the de Gennes self-similar carpet. Calculate the thickness ads of the adsorbed layer and the coverage P. 

Consider multichain adsorption in a good solvent, of dilute chains with N... 

If enzyme inactivation is not due to covalent changes in structure, the native active structure can be reformed in immobilized enzymes by refolding from a random coil state (22,27). In fact, if they are attached to the matrix by multiple points, even thermally inactivated multichain enzymes can be reactivated (27). Although such regeneration steps apparently have not been used commercially, their use should be considered in certain cases, especially since in many cases the inactivation may result from adsorption onto the enzyme matrix of components in the process stream. For example, we have found that immobilized sulfhydryl oxidase activity can be regenerated numerous times following treatment of UHT milk by washing with 4 M urea (28). 

---