A new description of semidilute solutions of rigid polyelectrolyte chains is

A major focus in our research group over the years has concerned the basic physical properties of polyelectrolytes in solution; scattering, interactions, conformations, and hydrodynamics. In the past it was often thought that polyelectrolyte solutions were almost impossible to measure reproducibly by light scattering, especially at low ionic strength. While it is true that the scattering from p...

Positively charged water-solid interfaces are prepared by adsorption of a cationic polyelectrolyte poly(diallyldimethylammonium chloride) (PDADMAC) from aqueous solutions to planar silica substrates. These substrates characterized atomic force microscopy (AFM), optical reflectivity, and streaming current measurements. By tuning the amount adsorbed polyelectrolyte, surface charge substrate can b...

TRANSLOCATIONS OF RING AND LINEAR POLYMERS & POLYELECTROLYTE BRUSH IN SALTY SOLUTION

Polyelectrolyte solution dynamics have been carefully studied experimentally and theoretically for unentangled solutions thought to be reasonably well understood. While theoretical models ...

We derive effective interaction potentials between hard, spherical colloidal particles and star-branched polyelectrolytes of various functionalities f and smaller size than the colloids. The effective interactions are based on a Derjaguin-like approximation, which is based on previously derived potentials acting between polyelectrolyte stars and planar walls. On the basis of these interactions...

Precise measurements on the density of sodium polystyrenesulphonate solutions in methanol-water mixed solvent media containing 8, 16, and 25 weight per cent of methanol at 308.15, 318.15, and 323.15 K are reported. The degree of substitution of sodium polystyrenesulphonate used is 1, and the concentrations are varied from 1 ×10 to 3.8 ×10 monomol.l. The results showed a slight increase on the p...

In this work, we first briefly review recent results regarding effective interactions of charged star polymers (polyelectrolyte stars) and then we present new results for many-body systems obtained by employing this interaction. The dominant role is played by the trapped counterions that bring about an entropic repulsion between the centres of these macromolecular aggregates. Subsequently, we e...

Recently, optical tweezing has been used to provide a method for microrheology addressed to measure the rheological properties of small volumes of samples. In this work, we corroborate this emerging field of microrheology by using these optical methods for the characterization of polyelectrolyte solutions with very low viscoelasticity. The influence of polyelectrolyte (i.e., polyacrylamide, PAM...

We report a microfluidic approach for one-step fabrication of polyelectrolyte microcapsules in aqueous conditions. Using two immiscible aqueous polymer solutions, we generate transient water-in-water-in-water double emulsion droplets and use them as templates to fabricate polyelectrolyte microcapsules. The capsule shell is formed by the complexation of oppositely charged polyelectrolytes at the...