Optical transmittance and electric conductivity in nematic dispersions containing carbon nanotubes and organomodified montmorillonite

• Дата: 2009
• Автори: Minenko, S.S., Kocherzhyn, A.I., Lisetski, L.N., Lebovka, N.I.
• Формат: Стаття
• Мова: English
• Опубліковано: НТК «Інститут монокристалів» НАН України 2009
• Назва видання: Functional Materials
• Теми: Characterization and properties
• Онлайн доступ: http://dspace.nbuv.gov.ua/handle/123456789/138912
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Цитувати: Optical transmittance and electric conductivity in nematic dispersions containing carbon nanotubes and organomodified montmorillonite // S.S. Minenko, A.I. Kocherzhyn, L.N. Lisetski, N.I. Lebovka // Functional Materials. — 2009. — Т. 16, № 3. — С. 319-323. — Бібліогр.: 14 назв. — англ.

Optical transmission and electric conductivity were measured for dispersions of multiwalled carbon nanotubes (MWCNT), organomodified montmorillonite (MMT) and for hybrid dispersions of MWCNT+MMT in 5CB nematic liquid crystal (LC). The optical transmittance jump at the nematic-isotropic transition was observed in MMT+LC (~0.1 % wt. of MMT). This behaviour was qualitatively similar to that of reported earlier for MWCNT+LC (~0.1 % wt. of MWCNT) nanocomposites, suggesting exfoliation of the organoclay plate-like particles and their incorporation into the orientationally ordered nematic structure. In hybrid dispersions the effect of MWCNT and MMT on optical transmission was additive. Noticeable differences in the electric conductivity behaviour for composites filled with MWCNTs and organomodified MMT were observed. It was shown that MWCNTs facilitated and MMT hindered the electric field-induced transition from planar to homeotropic state in the LC cell.