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TUTCRIS

Optical and topographic changes in water-responsive patterned cholesteric liquid crystalline polymer coatings

Tutkimustuotosvertaisarvioitu

Yksityiskohdat

AlkuperäiskieliEnglanti
OtsikkoProceedings of SPIE
AlaotsikkoOrganic Photonics VI
KustantajaSPIE
Vuosikerta9137
ISBN (painettu)9781628410853
DOI - pysyväislinkit
TilaJulkaistu - 2014
Julkaistu ulkoisestiKyllä
OKM-julkaisutyyppiA4 Artikkeli konferenssijulkaisussa
TapahtumaOrganic Photonics VI - Brussels, Belgia
Kesto: 15 huhtikuuta 201416 huhtikuuta 2014

Julkaisusarja

NimiProceedings of SPIE: the International Society for Optical Engineering
KustantajaSPIE
ISSN (painettu)0277-786X
ISSN (elektroninen)1996-756X

Conference

ConferenceOrganic Photonics VI
MaaBelgia
KaupunkiBrussels
Ajanjakso15/04/1416/04/14

Tiivistelmä

In this work, we present patterned water-responsive coatings, which alter both their topological and optical properties. The polymer coatings are based on a hydrogen-bonded cholesteric liquid crystalline polymer network. A two-step photopolymerization procedure leads to a patterned coating with repeating liquid crystalline and isotropic areas. The cholesteric liquid crystalline areas reflect green light, whilst the isotropic areas are transparent for visible light. Treatment with alkaline solution results in a hygroscopic polymer salt coating. When placed in demineralized water, the polymer films swells, leading to an enhancement of the surface topography structure in which the liquid crystalline areas swell more. Moreover, the pitch of the helical organization in the cholesteric areas increases due to this swelling leading to a color change from green to red.