Aggregate restructuring by polymer solvency effects

Aggregation dynamics of laminin-1 in a physiological solution: A time-resolved static light scattering study

“…On the other hand, in the gradual increase observed for t490 min, d f changed from 1.78, a typical value for DLCA, to 2.08. This feature completely matches previous studies of colloids and model calculation of fractal dimension change in the DLCA regime [25][26][27]. An increasing fractal dimension indicates that restructuring of the aggregates occurs over time, even for such a complex structure of protein than that of simple colloid.…”

Polymerization contraction of light-cured composite resins containing silica/polymethylmethacrylate bonded microstructured networks

“…This specific role of polymers in organic media is less known although its role as stabilization agent has been investigated [16,17]. Finally, even in the closely related domain of composites employed in restorative dentistry, the specific roles of the adsorbed polymer employed to enhance the filler/matrix cohesion and compatibility, as well as to decrease the resin shrinkage during curing, have not been investigated, in our opinion.…”

The Particulate Phase: A Voyage from the Molecule to the Granule

“…Effect of the steric forces was investigated by varying the configuration of grafted polystyrene chains on silica particles in cyclohexane by varying the temperature above and below the theta ( ) point (Huang and Berg, 2004). The fractal dimension d f was found to be a function of both time and temperature: It increased from a value of 1.75 at the transition temperature, to its equilibrium value of 2.13 with time while this equilibrium value increased to 2.84 as the temperature was decreased toward the end of the transition interval.…”

“…Fractal aggregates are also observed in gels of polymeric (Huang and Berg, 2004;Takenaka et al, 2004) or microemulsion origin (Bordi et al, 1996;Antalek et al, 1997;Letamendia et al, 1998), in fat-crystal networks (Narine and Marangoni, 1999) or in the sol-gel processes (Berthon et al, 2001;Chiavacci et al, 2004). Fractal dimension not only determines the compactness of the aggregate structure, but also affects the rheological behavior of concentrated suspensions (Lapasin et al, 1998), and migration of charges resulting in an increase of the conductivity (Bordi et al, 1996;Antalek et al, 1997).…”