Surface gelation

The Gelation of Nitrocellulose

of Results: % Ethyl Acetate W1166 W1167 W1168 W1169 W1170 W1171 #54 #50 #5036 #5060 #3362 #52 100 D F D D D D 70 D D D D D D 50 D D ND D D D 40 D F ND D ND D 35 D F ND D ND D

Critical dynamics of gelation.

Shear relaxation and dynamic density fluctuations are studied within a Rouse model, generalized to include the effects of permanent random crosslinks. We derive an exact correspondence between the static shear viscosity and the resistance of a random resistor network. This relation allows us to compute the static shear viscosity exactly for uncorrelated crosslinks. For more general percolation ...

Formulation of Ibuprofen Beads by Ionotropic Gelation

Microencapsulation has become a common technique in the production of controlled release dosage forms. Many results have been reported, concerning the use of alginate beads as controlled release drug formulations. Alginate has a unique gel-forming property in the presence of multivalent cations, in an aqueous medium. Ibuprofen is an excellent analgesic and antipyretic, non-steroidal anti-inflam...

Fluctuations in chemical gelation.

We study a chemical gelation model in two dimensions which includes both monomer aggregations and bond fluctuations. Our numerical simulation shows that a sol-gel transition occurs when an initial monomer concentration is above a critical concentration. Fractal aggregates grow until the sol-gel transition occurs. After the gelation, however, bond fluctuations break the fractal structure and an ...

Gelation of Magnetic Nanoparticles