Liquid crystals

Naikwadi, K.P.; Panse, D.G.; Bapat, B.V.; Ghatge, B.B.

doi:10.1016/s0021-9673(00)82547-9

Cited by 25 publications

(2 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Numerous workers have been studying the effect of the presence of lateral substituents on the analytical properties of the LCSPs [33][34][35][36][37][38]. It is pointed out that compounds with higher nematic range exhibit better selectivity [39]; however, the presence of lateral substituent on mesogenic structure leads to a decrease in nematic range and phase selectivity (with regard to isomers especially) by increasing the intermolecular distances in the mesophase, which reduce the steric effect responsible for the selectivity within the mesophase [40].…”

Section: Separation Techniquementioning

confidence: 99%

“…It is pointed out that compounds with higher nematic range exhibit better selectivity [39]; however, the presence of lateral substituent on mesogenic structure leads to a decrease in nematic range and phase selectivity (with regard to isomers especially) by increasing the intermolecular distances in the mesophase, which reduce the steric effect responsible for the selectivity within the mesophase [40]. In other researches, it is indicated that certain lateral substituents may decrease the nematic range but may yield a higher selectivity, and thus a better separation [34,35].…”

Section: Separation Techniquementioning

confidence: 99%

See 1 more Smart Citation

Historical Development of Liquid Crystalline Stationary Phases: An Overview

Ghanem¹

2015

AJAC

View full text Add to dashboard Cite

Abstract:Nematic liquid crystals have shown particular selectivity and sensitivity as stationary phases for the separation of isomers having similar volatilities. Because of their unique selectivity towards rigid solute isomers, liquid crystal stationary phases were considered at one time to be a very promising class of materials that give the gas chromatographic separations a great deal of attention. In this overview, we present a brief historical view of the liquid crystal stationary phases development, which were successfully used in gas chromatography for separation of isomers.

show abstract

Section: Separation Techniquementioning

confidence: 99%

Section: Separation Techniquementioning

confidence: 99%

Historical Development of Liquid Crystalline Stationary Phases: An Overview

Ghanem¹

2015

AJAC

View full text Add to dashboard Cite

show abstract

Liquid crystal stationary phases for gas chromatography and supercritical fluid chromatography

Rokushika

Naikwadi

Jadhav

et al. 1985

J. High Resol. Chromatogr.

View full text Add to dashboard Cite

Novel monomeric and polymeric liquid crystalline compounds were synthesized as stationary phases for gas chromatography (GC) and supercritical fluid chromatography (SFC). Monomeric liquid crystalline compounds were used in packed column gas chromatography for the separation of isomeric aromatic compounds and insect sex pheromones. Liquid crystalline polymers possess long nematic ranges and a uniform coating was easily achieved in glass and fused silica capillaries, which could stand temperatures up to 25OOC in GC and pressures of 200 MPa at 160OC in SFC. The columns provide excellent selectivity and resolution for fused ring aromatic compounds such as the isomers anthracene and phenanthrerie or triphenylene and chrysene.

show abstract

Synthesis of liquid crystalline polyacrylates and their use in capillary gas chromatography

et al. 1986

View full text Add to dashboard Cite

New enantiotropic liquid crystalline compounds based on 4-@-substituted pheny1azo)phenol and m-cresol esters containing an acryloyloxy group were synthesized. Polyacrylates were prepared from these monomers by radical polymerization. The resulting polymers exhibit nematic enantioropic properties. The polyacrylates have broader nematic ranges and higher nematic to isotropic transition temperatures as compared to their corresponding monomers. The nematic range is dependent on both the lateral substituents and the terminal substituents. The laterally substituted polyacrylates gave a narrower nematic range than unsubstituted compounds.Increase in carbon number in the terminal alkyl group leads to a broader nematic range. The liquid crystalline polyacrylates could be coated uniformly on the inside of a glass capillary tubing. The coated capillary columns show an excellent selectivity in gas chromatography for the separation of isomeric compounds. The liquid crystalline stationary phases are highly stable up to 230 "C without column bleeding.

show abstract

Liquid crystals

Cited by 25 publications

References 12 publications

Historical Development of Liquid Crystalline Stationary Phases: An Overview

Historical Development of Liquid Crystalline Stationary Phases: An Overview

Liquid crystal stationary phases for gas chromatography and supercritical fluid chromatography

Synthesis of liquid crystalline polyacrylates and their use in capillary gas chromatography

Contact Info

Product

Resources

About