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Bücher Englische Bücher Wissen & Bildung Naturwissenschaft, Medizin, Informatik, Technik Chemie Physikalische Chemie Ferronematic phases with strong coupling behavior based on liquid crystalline polymer decorated nanoparticles
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Ferronematic phases with strong coupling behavior based on liquid crystalline polymer decorated nanoparticles
Karin Koch (Broschiert, Englisch)
★★★★★
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Optischer Zustand
Beschreibung
The combination of magnetic nanoparticles and liquid crystalline (LC) phases leads to materials with unique magneto-optic behavior induced by a coupling between the magnetic director of the particles and the nematic director of the LC host. The strength of this coupling strongly depends on the stability of the particles against agglomeration, which is still the biggest challenge for the synthesis… of stable ferronematic phases.
In this work, novel ferronematics are synthesized and fully characterized. Therefore, strategies for the compatibilization of nanoparticles with LC phases are developed in order to obtain stable ferronematic phases. For this purpose, nanoparticles are surface-functionalized with polymer brushes using a grafting-from process and a grafting-to process. For the grafting-from process, a novel route for the surface modification of nanoparticles with poly(dimethylsiloxane) (PDMS) brushes by surface-initiated ring-opening polymerization of cyclosiloxanes catalyzed by strong phosphazene bases and initiated by particle surface-attached hydroxyl groups is developed.
In the grafting-to process, side-chain liquid crystalline polysiloxane brushes are synthesized separately and then grafted covalently to the surface of nanoparticles of different magnetic behaviors. The functionalized particles are used as doping agents for the LC host 4-cyano-4’-pentylbiphenyl (5CB) in order to synthesize stable ferronematic phases. The impact of the different particles on the properties of the LC phase is systematically analyzed with respect to the dopant concentration. Furthermore, the magneto-optic behavior is investigated in magnetic field-dependent capacitance measurements.
In summary, the results of this thesis give important insights for the compatibilization of nanoparticles with LC phases and the production of stable ferronematics and contributes to a better understanding of the magneto-nematic coupling in the novel materials. Dieses Produkt haben wir gerade leider nicht auf Lager.
Handgeprüfte Gebrauchtware
Bis zu 50 % günstiger als neu
Der Umwelt zuliebe
Technische Daten
Erscheinungsdatum
09.08.2021
Sprache
Englisch
EAN
9783843948272
Herausgeber
Dr. Hut
Serien- oder Bandtitel
Physikalische Chemie
Sonderedition
Nein
Autor
Karin Koch
Seitenanzahl
228
Einbandart
Broschiert
Schlagwörter
Flüssigkristalle, Ferronematische Phasen, Nanopartikel
Thema-Inhalt
PNR - Physikalische Chemie
Höhe
210 mm
Breite
14.8 cm
-.-
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