J Aggregates
“J aggregates are self-arrangements of cyanine molecules which form very ordered assemblies whereof the organizations are of the crystalline type. A description of J aggregates and their properties can be found in the article by H. Kuhn et al. in a book entitled "J-aggregates" by T. Kobayashi, ISBN 981-02-2737-X. Due to the nearly flawless organization of J aggregates, they have remarkable properties. Thus, it was observed that the irradiation of a two-dimensional monolayer of J aggregates leads to the formation of an exciton which is capable of spreading in all of this monolayer at a high speed, typically 2 km/s, coherently and with extremely low energy loss.”
“One possible application is light harvesting systems for solar devices and sensors, components for non-linear optical systems, fast optical recording systems, etc.”
Recent US Patents
11/2/2010
7,824,617
Assembly comprising J aggregates
Steiger and Pugin of CSEM Centre Suisse d'Electronique et de Microtechnique, Switzerland formed J aggregates of particular cyanines using a mesoporous support whereof the pores have an average BET diameter greater than 1.5 nm lined with funtionalized dendritic polymers. The cyanines interacting with the dendrites and J aggregates.
Recent Journal Articles
Polyion micelles with diphase-segregated core: electrostatic self-assembly of poly(ethylene glycol)-block-poly(4-vinylpyridium) and tetrakis (4-sulfonatophenyl) porphyrin in solution
(193-198) Colloid and Polymer Science 289 #2 (2011)
Junbo et al of the University of Science and Technology, China prepared polyion micelles with poly(ethylene glycol)-block-poly(4-vinylpyridium) (PEG114-b-P(4-VPH+)35) and tetrakis (4-sulfonatophenyl) porphyrin (TPPS) in acid aqueous solution. H- and J-type aggregates of TPPS were formed in the micellar core forming a diphase-segregated core, the polymer phase and the incompatible TPPS aggregates phase. (RDC 2/14/2011)