Liquid butane as a solvent for static coating of capillary columns

Wännman, T.; Blomberg, Lars G.; Schmidt, Staffan

doi:10.1002/jhrc.1240080109

Cited by 7 publications

(2 citation statements)

References 16 publications

(5 reference statements)

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“…Limitation by mass transfer will become more significant with decreasing column diameter, lower evaporation temperatures, and longer columns. Assuming the solvent vapor behaves ideally and obeys the Poiseuille law, and after converting from the mass flow of the solvent vapor to the speed of the meniscus, a formula for the mass transfer limited coating speed "u" has been derived by Xu and Vermeulen [15,16] 'Experimental data from [18]. For the calculations, a coating temperature of 22°C is used (room temperature in [ls]); SE-33 stationary phase.…”

Section: Resultsmentioning

confidence: 99%

“…This independence of coating velocity on stationary phase concentration is somewhat surprising, since for normal or wide bore columns, large differences in evaporation time are observed between thin and thick film columns. Wiimman et al [18], for example, measured coating times for different thin and thick film 50 and 230 pm i.d. columns using butane and pentane as solvent and SE-33 as stationary phase.…”

Section: Resultsmentioning

confidence: 99%

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Preparation of small diameter thick film capillary columns for microcolumn separations

Steenackers

Sandra

1994

J Microcolumn Separations

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Abstract. Open tubular columns of 25 and 50 pm i.d. have been coated with up to 2 pm thick layers of SE-54 (lowest P-value = 6.25). Filling of the columns and evaporation of the solvent were studied as a function of column length and time. Since the viscosity of the stationary phase solution increases exponentially with concentration, the filling process becomes time consuming and high filling pressures are required. The evaporation or coating speed is shown to be controlled by the resistance to mass transfer of the solvent vapor through the coated sections of the column. For 25 and 50 pm i.d. columns, experimental evaporation times deviate little from theoretical predictions. Almost no influence of the stationary phase on the coating speed was observed. The transition from mass transfer limited coating speed to heat transfer limited coating speed is illustrated using literature data.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Preparation of small diameter thick film capillary columns for microcolumn separations

Steenackers

Sandra

1994

J Microcolumn Separations

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Static coating of capillary columns by means of liquefied gases

Janák

Kahle

Tesařík

et al. 1985

J. High Resol. Chromatogr.

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SummaryThe technique of spontaneous coating of capillary columns employing liquefied butane and ethylene chloride as solvents of the stationary phase is described. These solvents and their mixtures are suitable for apolar and medium-polar stationary phases. The dependence of coating time on coating temperature and on the composition of the mixture of solvents was observed. It was found that the coating efficiency decreases with increasing coating speed.

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Device for filling of small diameter capillaries with stationary phase solutions in liquefied gases

Janák

Kahle

Horká

et al. 1988

J. High Resol. Chromatogr.

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SummaryThis paper describes a high pressure device lor filling small diameter capillaries with stationary phase solutions is described. A liquid is forced into the capillary column with the help 01 high pressure syringe whose needle (provided with a side opening) is tightened in a PTFE seal. The device allows use of liquefied gas as solvent. A detailed procedure is given lor filling the capillary with stationary phase solution. The performance 01 the device was evaluated by filling 12 m X 15 pm i. d. glass capillary with 6.5 ' YO (w/v) SE-54.

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Liquid butane as a solvent for static coating of capillary columns

Cited by 7 publications

References 16 publications

Preparation of small diameter thick film capillary columns for microcolumn separations

Preparation of small diameter thick film capillary columns for microcolumn separations

Static coating of capillary columns by means of liquefied gases

Device for filling of small diameter capillaries with stationary phase solutions in liquefied gases

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