Topics in Physical Chemistry Liquid Crystals Horst Stegemeyer | Ludwig Pohl | D. Demus | G. Pelzl | Heino Finkelmann | Karl Hiltrop | Martin Schadt Science / Chemistry / Physical & Theoretical In 1959, about 1400 compounds forming liquid crystalline phases were known; by 1992, this number had increased to about 50 000. In portable devices...