Characterization of a nematic mixture by reversed-phase HPLC and UV spectroscopy: An application to phase behaviour studies in liquid crystal-CO2 systems

Ana R.E. Brás; Sara Henriques; Teresa Casimiro; Ana Aguiar-Ricardo; João Sotomayor; Jorge Caldeira; Celina Santos; Madalena Dionísio

doi:10.1080/02678290601010915

Characterization of a nematic mixture by reversed-phase HPLC and UV spectroscopy: An application to phase behaviour studies in liquid crystal-CO₂ systems

Ana R.E. Brás, Sara Henriques, Teresa Casimiro, Ana Aguiar-Ricardo, João Sotomayor, Jorge Caldeira, Celina Santos, Madalena Dionísio

Research output: Contribution to journal › Article › peer-review

21 Citations (Scopus)

Abstract

In the present work a simple but selective reversed-phase high performance liquid chromatographic method (HPLC) was developed for the analysis of the nematic liquid crystal mixture E7 to determine precisely the composition of the liquid crystal mixture used in PDLC film preparation. Ultraviolet absorption spectrophotometry experiments were carried out to determine the HPLC detection wavelength and to characterize the absorptivity constants of E7 constituents. The technique developed is applied in the case of equilibrium solubility studies for E7 in supercritical carbon dioxide (scCO₂). The results indicate unambiguously that scCO₂ can fractionate the mixture towards the E7 components. The four single component peaks of the E7 mixture were distinctively separated by this method, which enabled the determination of the solubility of E7 constituents in the scCO₂.

Original language	English
Pages (from-to)	591-597
Number of pages	7
Journal	Liquid Crystals
Volume	34
Issue number	5
DOIs	https://doi.org/10.1080/02678290601010915
Publication status	Published - May 2007

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title = "Characterization of a nematic mixture by reversed-phase HPLC and UV spectroscopy: An application to phase behaviour studies in liquid crystal-CO2 systems",

abstract = "In the present work a simple but selective reversed-phase high performance liquid chromatographic method (HPLC) was developed for the analysis of the nematic liquid crystal mixture E7 to determine precisely the composition of the liquid crystal mixture used in PDLC film preparation. Ultraviolet absorption spectrophotometry experiments were carried out to determine the HPLC detection wavelength and to characterize the absorptivity constants of E7 constituents. The technique developed is applied in the case of equilibrium solubility studies for E7 in supercritical carbon dioxide (scCO2). The results indicate unambiguously that scCO2 can fractionate the mixture towards the E7 components. The four single component peaks of the E7 mixture were distinctively separated by this method, which enabled the determination of the solubility of E7 constituents in the scCO2.",

author = "Br{\'a}s, {Ana R.E.} and Sara Henriques and Teresa Casimiro and Ana Aguiar-Ricardo and Jo{\~a}o Sotomayor and Jorge Caldeira and Celina Santos and Madalena Dion{\'i}sio",

note = "Funding Information: This work was supported by Fundac¸{\~a}o para a Ci{\^e}ncia e Tecnologia through the projects POCTI/CTM/37435/ 2001, POCTI/CTM/47363/2002 and grant SFRH/BPD/ 11665/2002, and by FEDER and FSE.",

year = "2007",

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doi = "10.1080/02678290601010915",

language = "English",

volume = "34",

pages = "591--597",

journal = "Liquid Crystals",

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TY - JOUR

T1 - Characterization of a nematic mixture by reversed-phase HPLC and UV spectroscopy

T2 - An application to phase behaviour studies in liquid crystal-CO2 systems

AU - Brás, Ana R.E.

AU - Henriques, Sara

AU - Casimiro, Teresa

AU - Aguiar-Ricardo, Ana

AU - Sotomayor, João

AU - Caldeira, Jorge

AU - Santos, Celina

AU - Dionísio, Madalena

N1 - Funding Information: This work was supported by Fundac¸ão para a Ciência e Tecnologia through the projects POCTI/CTM/37435/ 2001, POCTI/CTM/47363/2002 and grant SFRH/BPD/ 11665/2002, and by FEDER and FSE.

PY - 2007/5

Y1 - 2007/5

N2 - In the present work a simple but selective reversed-phase high performance liquid chromatographic method (HPLC) was developed for the analysis of the nematic liquid crystal mixture E7 to determine precisely the composition of the liquid crystal mixture used in PDLC film preparation. Ultraviolet absorption spectrophotometry experiments were carried out to determine the HPLC detection wavelength and to characterize the absorptivity constants of E7 constituents. The technique developed is applied in the case of equilibrium solubility studies for E7 in supercritical carbon dioxide (scCO2). The results indicate unambiguously that scCO2 can fractionate the mixture towards the E7 components. The four single component peaks of the E7 mixture were distinctively separated by this method, which enabled the determination of the solubility of E7 constituents in the scCO2.

AB - In the present work a simple but selective reversed-phase high performance liquid chromatographic method (HPLC) was developed for the analysis of the nematic liquid crystal mixture E7 to determine precisely the composition of the liquid crystal mixture used in PDLC film preparation. Ultraviolet absorption spectrophotometry experiments were carried out to determine the HPLC detection wavelength and to characterize the absorptivity constants of E7 constituents. The technique developed is applied in the case of equilibrium solubility studies for E7 in supercritical carbon dioxide (scCO2). The results indicate unambiguously that scCO2 can fractionate the mixture towards the E7 components. The four single component peaks of the E7 mixture were distinctively separated by this method, which enabled the determination of the solubility of E7 constituents in the scCO2.

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JO - Liquid Crystals

JF - Liquid Crystals

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ER -

Characterization of a nematic mixture by reversed-phase HPLC and UV spectroscopy: An application to phase behaviour studies in liquid crystal-CO₂ systems

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