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dc.contributor.advisorRaghavan, Srinivasaen_US
dc.contributor.authorTiwari, Khyati Ren_US
dc.date.accessioned2008-08-07T05:31:12Z
dc.date.available2008-08-07T05:31:12Z
dc.date.issued2008-05-23en_US
dc.identifier.urihttp://hdl.handle.net/1903/8329
dc.description.abstractPolymer capsules and beads can be easily created by combining either two oppositely charged polymers or one polymer and a multivalent salt. These structures have been mainly investigated until now for their controlled release properties. Here, we study the ability to impart new functionalities to capsules by embedding a second kind of colloidal or nano-structure in their interior. Three different concepts are explored in this regard. First, we demonstrate capsules that are responsive to pH. For this purpose, we entrap vesicles made from a diacetylene surfactant in chitosan capsules. The resulting capsules change their color blue blue to red as the pH of the solution is increased. The next concept involves capsules with the ability to sense and separate cations from solution. In this case, nanoscale particles of synthetic clay (laponite) are localized in alginate beads. The resulting hybrid beads can effectively separate a cationic dye from a mixture of cationic and anionic dyes. The third concept involves linking of magnetic chitosan-gelatin capsules in a chain to create an artificial earthworm, i.e., a structure that can undergo guided motion in a fluid environment under an external magnetic field.en_US
dc.format.extent945400 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoen_US
dc.titlePolymer Capsules: Fundamental Studies and New Conceptsen_US
dc.typeThesisen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.contributor.departmentChemical Engineeringen_US
dc.subject.pqcontrolledEngineering, Chemicalen_US


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