The dependence of the properties of liquid crystals on the film thickness and surface quality of capillary columns

Matisová, Eva; Hudec, D.; Garaj, J.; Kraus, G.; Schierhorn, M.; Isenberg, A.

doi:10.1007/bf02263219

Cited by 5 publications

(1 citation statement)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It also seems that the linear and symmetrical molecules are retained longer on the liquid crystalline column as in p-cresol [10] . The behaviour of phenol isomers and their order of elution from the column could also be explained on the basis of stereo conformation.…”

Section: Fig (5) Nematic Texture Of Phase (Ii)mentioning

confidence: 99%

Gas Chromatographic Separation of Isomeric Phenols by Schiff`s Base Liquid Crystalline Stationary Phases

Hammza¹

2013

JNUS

View full text Add to dashboard Cite

The chromatographic behaviour of liquid crystalline compounds 4-(propyloxybenzylidene)-4`-p-aminoazobenzene (1) and 4-(butyloxybenz--ylidene)-4`-p-aminoazobenzene (2) as stationary phases for the separation of cresol isomers was investigated. These isomers were analysed on 4-(propyloxybenzylidene)-4`-p-aminoazobenzene within a nematic range of 142-153° C with a temperature interval of 5° C. Better peak resolution was at a column temperature of 147° C. The analysis was repeated on a and 4-(butyloxybenzylidene)-4`-p-aminoazobenzene column at a nematic temperature of 176° C, which represented the end of the nematic range, and gave the optimum peak resolution. It was found that isomer better separation was obtained at 20% loading for both liquid crystal materials. Other columns of different liquid crystalline percentages (15% and 25%) were used. A chromatogram with unoverlapped peaks was only obtained in both cases at 20% column loading. The order of elution isomers under the applied chromatographic conditions is discussed. The separation of these isomers is also discussed on the basis of stereo chemical conformations.

show abstract

Section: Fig (5) Nematic Texture Of Phase (Ii)mentioning

confidence: 99%