A promising "metastable" liquid crystal stationary phase for gas chromatography

Khodja, Faïza Ammar; Sassiat, Patrick; Hanafi, Mohamed; Thiébaut, Didier; Vial, Jérôme

doi:10.1016/j.chroma.2019.460786

Cited by 4 publications

(1 citation statement)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although it is considered as a separate phase between the solid and liquid phase, it can have at least one property of the solid and liquid phase. In the LC structure, the spontaneous orientation of the molecules in a certain direction provides a geometric selectivity to the stationary phase [3][4][5][6]. The orientation of the molecules in the LC structure can also differentiate the properties and usage fields of the LC.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the surface properties of 4-(Decyloxy) benzoic acid liquid crystal and its use in structural isomer separation

2021

View full text Add to dashboard Cite

The selectivity of 4-(Decyloxy) benzoic acid (DBA) liquid crystal in surface adsorption region (303.2 -328.2 K) and thermodynamic region (423.2 -433.2 K) was investigated by inverse gas chromatography at infinite dilution (IGC-ID). The selectivity parameters of the structural isomer series named butyl acetate, butyl alcohol and amyl alcohol series were calculated for the DBA using IGC-ID technique. Additionally, the surface properties including dispersive surface energy (γ S D ), free energy (∆G A S ), enthalpy (∆H A S ), and acidity-basicity constants were calculated with net retention volumes obtained from IGC-ID experiment results. When the ∆H A S and ∆G A S constants, DBA surface was found to be an acidic character (K D /K A ≅ 0.89).

show abstract

Section: Introductionmentioning

confidence: 99%

Evaluation of the surface properties of 4-(Decyloxy) benzoic acid liquid crystal and its use in structural isomer separation

2021

View full text Add to dashboard Cite

show abstract

Liquid Crystal Entrapped Porous Films for Ammonia Sensing and Determination of Surface Properties of Liquid Crystal Molecule

2021

View full text Add to dashboard Cite

A highly ordered porous film was fabricated by the sol-gel process using 3-mercaptopropyltrimethoxysilane (MPTMS) precursor and polystyrene microspheres template. The liquid crystal (LC) (4-(Octyloxy) benzoic acid) (OBA) was entrapped into the voids of the pre-fabricated porous structure to obtain sensing materials that were characterized by scanning electron microscope (SEM) and fourier transform infrared spectroscopy (FT-IR). The impedance of the films was measured and the capacitive reactance response (1/-X) of LC-based sensor exhibited satisfactory linear correlation (R 2 = 0.9994) with the concentration of ammonia up to 50 ppm with a limit of detection (LOD) and quantification of 1.2 ppm and 4.0 ppm, respectively. The sensor exhibited high selectivity to ammonia compared to the different classes of solvent vapors, and satisfactory repeatability (RSD = 4 %) and response time (10 min). Also, inverse gas chromatography (IGC) was used to confirm the acidic surface behavior of LC and its selectivity to ammonia. The results proved that the studied LC-based sensor may be promise candidate for sensitive and selective determination of ammonia.

show abstract

Original Mesogenic Citronellol-Based Stationary Phase for Both Normal- and Reversed-Phase HPLC Modes: Properties and Applications

et al. 2020

View full text Add to dashboard Cite

A promising "metastable" liquid crystal stationary phase for gas chromatography

Cited by 4 publications

References 31 publications

Evaluation of the surface properties of 4-(Decyloxy) benzoic acid liquid crystal and its use in structural isomer separation

Evaluation of the surface properties of 4-(Decyloxy) benzoic acid liquid crystal and its use in structural isomer separation

Liquid Crystal Entrapped Porous Films for Ammonia Sensing and Determination of Surface Properties of Liquid Crystal Molecule

Original Mesogenic Citronellol-Based Stationary Phase for Both Normal- and Reversed-Phase HPLC Modes: Properties and Applications

Contact Info

Product

Resources

About