Prepare your TEFLON Packings by HI-EFF Fluidization
THE
EDITORS' COLUMN Τ
IQUID CRYSTAL P H E N O M E N A ,
Isopropyl Alcohol Acetone DIS-
-*-ΌονΕΚΕϋ by the Austrian botanist Frederick Reinetzer in 1888, is rapidly becoming (after several pe riods of "rebirth") one of the most intriguing areas of scientific re search. After an inactive period of approximately 30 years, there is such a boom that at least one re searcher has been prompted to pre dict that future developments might be as dramatic as those in solidstate research in the past 15 years! Analytical chemists are interested in the thermometric property of cholesteric liquid crystals, which is manifested in scattering of incident white light into colors as a function of temperature. A very recent ap plication was described at the I E E E 1967 International Electron Devices Meeting in Washington, D.C., by George V. Lukianoff of IBM. This involved coating a microelectronic device with a liquid crystal that had a color variation over a three-degree range. A resolution of 0.3 degree C. was obtained by normal microscopic observation, and it was stated that measurement accuracy of 0.01 de gree C. might be obtained by using spectroscopic equipment with good wavelength separation ability. We reported another application of the thermometric property of liquid crystals last , year [ANAL. CHEM., 38 (11), 149A
Ethyl Acetate
Ethyl Alcohol
For information about the HI-EFF Fluidizer and its use, ask for our Bulletin 2A and a reprint of the article by Kruppa, Henly and Smead in Anal. Chem., June, 1967, pp. 851-53. sec-Butyl Alcohol η-Butyl Alcohol
(1966)]—a
liquid crystal that can be applied to the surface of a material to de tect pinpoint flaws. Good examples of the variety of research problems that involve liq uid crystals are found in #63 of the ACS Advances in Chemistry Series, "Ordered Fluids and Liquid Crys tals," published earlier this year. These reports involved both the sys tems in which liquid crystals are found and the effects produced therein (such as biological systems) , and the study of liquid crystals themselves by advanced instrumen tal techniques such as N M R and DTA.
6% Carbowax 400 on 4 0 / 6 0 Chiomosorb T. Packing prepared by flltration/HI-EFF fluidization. Column: 100°C; detector: flame ionization (190°C); flash heater: 150°Cs Ng Carrier, 19 m l / m i n . at 2.5 psig.
APPLIED SCIENCE Laboratories. Inc. P. O. Box 4 4 0
State College, Pa. 16801
West Coast Branch: 1 1135 Inglewood Ave. Circle No. 16 on Readers' Service Card
Circle No. 27 on Readers' Service Card
·
·
I n g l e w o o d , Calif 9 0 3 0 4
See ACS Laboratory Guide for All Products/Sales Office V O L . 3 9 , N O . 1 4 , DECEMBER 1 9 6 7
·
95
A
