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| Titel: |
Electric field-induced nucleation and growth of focal-conic and stripe domains in a smectic A liquid crystal |
| Auteur: |
Garg, Shila Purdy, Kirstin Bramley, Erica Smalyukh, I. I. Lavrentovich, O. D. |
| Verschenen in: |
Liquid crystals |
| Paginering: | Jaargang 30 (2003) nr. 12 pagina's 1377-1390 |
| Jaar: |
2003-12 |
| Inhoud: |
We have studied the electric field-induced first order transition from a homeotropic smectic A structure to a polydomain texture that occurs through the nucleation of toric focal-conic domains (TFCDs). The process involves two steps: first, nucleation of TFCDs of a size larger than a critical radius a*, and then a steady growth of TFCDs to a secondary critical radius a**, when surface anchoring effects become dominant and cause a transition from a circular TFCD to an elongated stripe domain (SD). Studies were performed for pure smectic A materials and for smectic A doped with kunipia nanoparticles. Non-destructive 3D imaging with fluorescence confocal polarizing microscopy showed that field-induced TFCDs can nucleate in the smectic A bulk. Clay particles reduce the energy barrier for nucleation as they distort the smectic A layers and thus increase the ground state energy. Simple elastic models of the TFCD and SD allow us to describe the qualitative features of the observed phenomena. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 38 van 133 gevonden artikelen
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