
Sourav PatranabishDelft University of Technology | TU · Aerospace Structures and Materials (ASM)
Sourav Patranabish
Ph.D. (Physics)
Postdoc Researcher working on multiaxis printing with Liquid Crystal Polymer
About
13
Publications
1,727
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33
Citations
Introduction
Experiments and theory of Liquid Crystals (Bent-core liquid crystals, cybotactic nematic phases, twist-bend nematic phases etc.), Ferroelectric polarization, Polymers, Energy harvesting, DFT calculations
Additional affiliations
August 2023 - January 2024
January 2023 - March 2023
Position
- ICMS Visiting Fellow
Description
- Visiting Fellowship supported by the International Centre for Mathematical Sciences (ICMS), Edinburgh, UK. During this visiting fellowship, I collaborated with Prof. Apala Majumdar and her group on the free energy modelling of an emerging problem of the twist-bend nematic (N_tb) liquid crystals (LCs) and the effect of external electric field, which is motivated by the experimental results from my PhD thesis work. [Website: https://www.icms.org.uk/visiting-fellows]
Education
Publications
Publications (13)
The bent-core liquid crystals (LCs) are highly regarded as the next-generation materials for electro-optic devices. The nematic (N) phase of these LCs possesses highly ordered smecticlike cybotactic clusters which are promising for electro-optic applications. We have studied a one-dimensional Landau–de Gennes model of spatially inhomogeneous order...
We study a quantum-dots (QDs) dispersed bent-core nematic liquid crystalline system in planar geometry and present experimental measurements of the birefringence (Δn), order parameter (S), dielectric dispersion, absorption spectra, and optical textures with attention to variations with temperature. A bent-core liquid crystal (LC) 14−2M−CH3 is used...
Polymers and peptides have recently been considered as promising materials for piezoelectric energy harvesting because of their biocompatibility and enormous design possibility. However, achieving significant output voltages while meeting environmental safety requirements, low‐cost and easy fabrication remains a major challenge. Herein, we have fab...
The twist-bend nematic (N tb ) phase is a recent addition to the family of nematic (N) phases of liquid crystals (LCs). A net polar order in the N tb phase under an external electric field is interesting and it was predicted in several recent theoretical studies. We investigated the field-induced polarization behaviour, dielectric, and electro-opti...
We study a quantum-dots dispersed bent core liquid crystalline system inside a planar cell and present experimental measurements of the order parameter, dispersion and absorption spectra, with attention to variations with temperature. Our notable findings concern the reduction of the orientation order parameter of the quantum-dots dispersed system...
A fast switching liquid crystal (LC), especially in its nematic (N) phase, can significantly improve the performance and properties of present-day electro-optic devices and displays. We investigated the polar nature and switching behaviour of a bent shaped liquid crystal (LC) CB7CB at different temperatures, subjected to applied voltages of varying...
We report successful tailoring of the absorption and photoluminescence behaviour of a nematic liquid crystal (LC) 5CB via doping with a chiral nematic LC and its application in sensing for the detection of UV-B content of the solar irradiation.
The bent-core liquid crystals (LCs) are highly regarded as the next-generation materials for electro-optic devices. The nematic (N) phase of these LCs possesses highly ordered smectic-like cybotactic clusters which are promising in terms of ferroelectric-like behaviour in the N phase itself. We have studied a one-dimensional (1D) Landau-deGennes mo...
Bent-core liquid crystals are candidates for promising and interesting new research in the field of liquid crystals (LCs). This class of LCs possess remarkable and unusual characteristic feature in their shape, size, chirality, electrical, optical and transport properties. When subjected to an external electric field, the bent-core LCs often exhibi...
We report possible biaxiality in the nematic phase of a bent-core liquid crystal compound exhibiting cybotactic clustering in the entire nematic liquid crystal phase using dielectric spectroscopy with promising application in faster switching displays.
We report possible biaxiality in the nematic phase of a bent-core liquid crystal compound exhibiting cybotactic clustering in entire nematic liquid crystal phase using dielectric spectroscopy with promising application in faster switching displays.
Questions
Questions (2)
I am getting an unusual hump (or a peak maybe) near the zero crossover (time axis) in the voltage response of a bent-core liquid crystal compound using polarization reversal triangular wave method to study the spontaneous polarization. The base-line correction of the output signal/response yields an S-shaped curve with a positive as well as a negative area. Is it due to spontaneous polarization? Please help.
An oscilloscope image along with the base-line corrected plot (S-shaped) of the same is attached. In the oscilloscope image, the colour yellow corresponds to the input and the colour blue corresponds to the output signal.
Thank you.
Currently I am using silver conducting paint to make the contacts in Liquid Crystal Cells made of ITO coated glass plates and covering it up with Loctite hysol 3425 a&b glue so that the contact remains stable at high temperatures and for a sufficiently long period of time. However after using the cell for a day or two the glue turns black (maybe due to heating) and the contact is spoilt making the whole LC cell useless. Please suggest an way out / any alternative method that I may utilize to do the same(making a stable contact) without spoiling the contact even at temperatures as high as 2000C. Thank you.