title: A method for heat-stimulated compression of poly(N-isopropyl acrylamide) hydrogels inside single giant unilamellar vesicles.
abstract: In this letter, a hydrogel compression method for the facile generation of high polymer concentration within single giant unilamelar vesicles (GUV) is presented. A GUV with an internalized poly(N-isopropyl acrylamide) solution is heated above the lower critical solution temperature (LCST) until compartmentalization by collapsed hydrogel microaggregates occurs. Subsequently, the volume of the vesicle is decreased by reducing the area of the enclosing membrane. An increase in concentration by a factor of up to 11 is reached while the membrane remains intact, bringing the model system close to the living cell situation with its high concentration of proteins in the cytoplasm. The polymer-filled vesicles are also in a suitable density range to significantly improve the flow control performance of hydrogel valves embedded in soft matter nanofluidic devices.
authors.affiliation: Department of Chemical and Biological Engineering, Chalmers University of Technology, SE-41296 Göteborg, Sweden.
authors.forename: Lidiya
authors.initials: L
authors.lastname: Osinkina
authors.forename: Martin
authors.initials: M
authors.lastname: Markström
authors.forename: Owe
authors.initials: O
authors.lastname: Orwar
authors.forename: Aldo
authors.initials: A
authors.lastname: Jesorka
mesh_terms: D000178:Acrylamides / Q000737:chemistry*; D000180:Acrylic Resins; D006358:Hot Temperature; D020100:Hydrogels / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D012996:Solutions; D053835:Unilamellar Liposomes / Q000737:chemistry*
chemical_list: D000178:Acrylamides; D000180:Acrylic Resins; D020100:Hydrogels; D011108:Polymers; D012996:Solutions; D053835:Unilamellar Liposomes; C052970:poly-N-isopropylacrylamide