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Volume 13 | Issue 2 | Year 2026 | Article Id. IJAP-V13I2P101 | DOI : https://doi.org/10.14445/23500301/IJAP-V13I2P101

Studying Details of Phase Transitions of 7OCB Liquid Crystal using DSC Technique

Robert Nichol, Dipti Sharma

Received Revised Accepted Published
26 Apr 2026 05 May 2026 07 May 2026 08 Jun 2026

Citation :

Robert Nichol, Dipti Sharma, "Studying Details of Phase Transitions of 7OCB Liquid Crystal using DSC Technique," International Journal of Applied Physics, vol. 13, no. 2, pp. 1-16, 2026. Crossref, https://doi.org/10.14445/23500301/IJAP-V13I2P101

Abstract

In this study, the Liquid Crystal (LC) 4-Cyano-4'-Heptyloxybiphenyl (7OCB) was studied using Differential Scanning Calorimetry (DSC). A small amount of the sample was used in the DSC, and the sample was heated from -20ºC to 100ºC and then cooled from that temperature at a 20ºC/min ramp rate. The data for heat flow were collected as a function of temperature and time for heating and cooling from DSC. Further, the detailed analysis was performed using LoggerPro. The 7OCB liquid crystal belongs to the family of nOCB that has an atom of Oxygen. Usually, nCB, a family of LC without Oxygen, has been used in smart devices such as Liquid Crystal Display (LCD), but the goal of this paper is to see if the nOCB family of LC, especially the member 7OCB from this family, can be used potentially in LCDs, comparing nOCB with nCB LCs. The Nematic phase transition and Nematic range are important for LCDs and Smart devices. Based on the detailed study of 7OCB, it is found that it shows a much longer Nematic range with an increase when compared with heat and cool of 41.7ºC. This wide range can be very useful in multiple different climates, the LC remaining in the nematic phase over a wider range of temperatures, withstanding different climates and seasons. This shows that the 7OCB liquid crystal can be very useful in the Liquid Crystal industry to create smart devices such as smart laptops, watches, TVs, etc.

Keywords

Liquid Crystals, Crystalline, Nematic, Isotropic, Phases, Nematic Range, Differential Scanning Calorimetry, LCD, Heat Flow, Specific Heat Capacity, Endothermic, Exothermic, Thermodynamics, Thermal speed, Thermal acceleration, Thermal jerk, Temperature, LoggerPro.

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