Journal of Material Sciences & Engineering

Department of Natural Sciences, Garissa University, Garissa, Kenya

Publications

• Research   
  Optical Techniques in the Determination of Pitch Lengths in the Cholesteric and Chiral Smectic C Phases
  Author(s): Hussein S.A. Golicha*, Mohamed H. Omar and Nelson M. Mbithi
  
  There is no denying that the future of liquid crystals is in the display industry. The use of the twisted nematic (TN) and the superwisted nematic (STN) is widespread. The twisting in these devices is achieved either by use of optical components such as polarizers or the use of chiral dopants in a guest-host system. The later has gained much more attention. This is because not only are the accompanying optical components not needed, but any desired colour can be achieved by varying the pitch length of the helix formed by the chiral nematic (cholesteric) compound. In such application, the ability to determine the pitches of the resulting helical superstructure accurately and quickly is essential. Currently there are many methods for measuring the pitch of a helical super structure. These methods mostly employ optical or spectroscopic techniques. In this paper, four such methods namely,.. Read More»
  DOI: 10.37421/2169-0022.2021.10.564

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