Assembly kinetics in binary mixtures of strongly attractive colloids.
The early stages of aggregation kinetics in a binary mixture of asymmetric colloids, aggregating irreversibly via biotin-streptavidin bonds, are experimentally and numerically studied. Experiments are performed by DLS methods, and data are analyzed in terms of a Smoluchowski-like coagulation equation. Focus is on the case of small (S) biotin-covered particles interacting with large (L) streptavidin-covered ones. The small particles act as linkers between the large ones. The dependence of S-L and L-L aggregation rate constants on the ratio between concentration of small and large particles is investigated, to detect the concentration at which aggregation of large particles is most effective.
Ghofraniha
Neda
N
Dipartimento di Fisica, Dipartimento di Chimica, and SOFT-INFM-CNR, c/o Universita' La Sapienza, Piazzale Aldo Moro 5, 00185 Roma, Italy. neda.ghofraniha@roma1.infn.it
Andreozzi
Patrizia
P
Russo
John
J
La Mesa
Camillo
C
Sciortino
Francesco
F
D000327:Adsorption; D001710:Biotin / Q000737:chemistry / Q000378:metabolism; D003102:Colloids / Q000737:chemistry*; D045424:Complex Mixtures / Q000737:chemistry*; D007700:Kinetics; D019809:Streptavidin / Q000737:chemistry / Q000378:metabolism; D013499:Surface Properties
D003102:Colloids; D045424:Complex Mixtures; D001710:Biotin; D019809:Streptavidin