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Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/8641
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dc.contributor.authorPriscilla, P-
dc.contributor.authorFisch, Michael R-
dc.contributor.authorKumar, Sandeep-
dc.contributor.authorGathania, Arvind Kumar-
dc.contributor.authorPrakash, Jai-
dc.contributor.authorSupreet-
dc.contributor.authorKumar, Sanjeev-
dc.contributor.authorKaushal, Sandeep-
dc.contributor.authorCastagna, Riccardo-
dc.contributor.authorSingh, Gautam-
dc.date.accessioned2026-02-11T08:53:34Z-
dc.date.available2026-02-11T08:53:34Z-
dc.date.issued2026-01-05-
dc.identifier.citationColloids and Surfaces A: Physicochemical and Engineering Aspects, 2026, Vol. 728(3), AR No. 138735en_US
dc.identifier.issn1873-4359-
dc.identifier.urihttp://hdl.handle.net/2289/8641-
dc.descriptionRestricted Access.en_US
dc.description.abstractWe report the effect of varying the thickness of cells (d = 5, 7.5, and 15 μm) with planar alignment layers on the induced vertical alignment of a nematic liquid crystal (NLC) composite, 5CB doped with 0.5 wt% carbon dots (CDs). The composite was studied using optical polarizing microscopy, dielectric spectroscopy and electrical conductivity. Optical textures confirm almost defect free induced vertical alignment of the NLC in 5 μm thick cells. At a cell thickness of 7.5 μm, optical defects form but the NLC maintained induced vertical alignment. However, for 15 μm thick samples, larger defects formed leading to a deterioration of optical contrast. The dielectric permittivity decreased with an increase in cell thickness. Also, the short axis molecular relaxation exhibited shift towards higher frequency in 7.5 and 15 μm cells, respectively with respect to the 5 μm cell. This could be attributed to the lowering of the nematic ordering in the composite due to the weakening of the CDs anchoring force on the bulk NLC molecules. The temperature dependent short axis molecular relaxation exhibited Arrhenius behavior and the corresponding activation energy was found to be strongly thickness dependent. Moreover, this study establishes a direct link between cell thickness and electrical conductivity whereby increasing cell thickness: (i) lowers the space charge polarization effect and (ii) decreases the DC conductivity. Our study provides a new insight about the effect of varying cell thickness on the molecular alignment, dielectric, and electrical conductivity of the 0.5 wt% CDs-5CB composites. We anticipate that our findings will be helpful in the development of the next generation display devices with better alignment and reduced space charge polarization effect.en_US
dc.language.isoenen_US
dc.publisherColloids and Surfaces A: Physicochemical and Engineering Aspectsen_US
dc.relation.urihttps://doi.org/10.1016/j.colsurfa.2025.138735en_US
dc.rights2026 Elsevier B.V.en_US
dc.subjectNematic liquid crystalen_US
dc.subjectCarbon dotsen_US
dc.subjectCell thicknessen_US
dc.subjectDielectric propertiesen_US
dc.subjectElectrical conductivityen_US
dc.subjectVertical alignmenten_US
dc.titleImpact of cell thickness on the induced vertical alignment, dielectric and electrical conductivity of carbon dots doped nematic liquid crystal compositeen_US
dc.typeArticleen_US
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