6533b821fe1ef96bd127afae
RESEARCH PRODUCT
Design of nonionic surfactants for supercritical carbon dioxide
Douglas E. BettsJ. D. LondonoJames B. McclainRoberto TrioloH. D. CochranDorian A. CanelasEdward T. SamulskiGeorge D. WignallD. Chillura-martinoJoseph M. Desimonesubject
AcrylateMultidisciplinarySupercritical carbon dioxideSANSMicelleSupercritical fluidSolventchemistry.chemical_compoundchemistrysupercritical-CO2AmphiphilemicelleCopolymerOrganic chemistrySolubilitydescription
Interfacially active block copolymer amphiphiles have been synthesized and their self-assembly into micelles in supercritical carbon dioxide (CO 2 ) has been demonstrated with small-angle neutron scattering (SANS). These materials establish the design criteria for molecularly engineered surfactants that can stabilize and disperse otherwise insoluble matter into a CO 2 continuous phase. Polystyrene- b -poly(1,1-dihydroperfluorooctyl acrylate) copolymers self-assembled into polydisperse core-shell-type micelles as a result of the disparate solubility characteristics of the different block segments in CO 2 . These nonionic surfactants for CO 2 were shown by SANS to be capable of emulsifying up to 20 percent by weight of a CO 2 -insoluble hydrocarbon into CO 2 . This result demonstrates the efficacy of surfactant-modified CO 2 in reducing the large volumes of organic and halogenated solvent waste streams released into our environment by solvent-intensive manufacturing and process industries.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1996-12-20 |