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Administrative data

Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
accepted calculation method

Data source

Reference
Reference Type:
publication
Title:
Influence of the anion on the surface tension of 1-ethyl-3-methylimidazolium-based ionic liquids
Author:
Hugo F.D. Almeida, Ana Rita R. Teles, José A. Lopes-da-Silva, Mara G. Freire, Joao A.P. Coutinho
Year:
2012
Bibliographic source:
Journal of Chemical Thermodynamics (2012), 54, 49-54

Materials and methods

Principles of method if other than guideline:
The surface tension was determined through the analysis of the shape of the pendant drop and measured using a Dataphysics contact angle system OCA-20. Drop volumes of (15 +/- 2) µL were obtained using a Hamilton DS 500/GT syringe connected to a Teflon coated needle placed inside an aluminium air chamber capabled of maintaining the temperature within +/- 0.1 K. The temperature was attained by circulating water in the double jacketed aluminium cell by means of a Julabo F-25 water bath. The surface tensions measurements were performed in the temperature range from (298 to 343) K. The temperatue inside the aluminium chamber, and at which the surface tensions were determined, was measurd with a Pt100 within +/- 0.1 K wich was placed at a distance of approximately 2 cm to the liquid drop. After attaining a specific temerature, the measurments were carried out after 30 min to quarantee the thermal stabilization. Silica gel was kept inside the air chamber aiming at keeping a dry environment and to avoid the adsorption of moisture by the ionic liquid. For the surface tension determination at each temperatur at least six drops were formed and measured. For each drop, an average of 130 images was additionally captured. The analysis of the drop shape was performed with the software modules SCA 20.
In order to validate the equipmen and methodology used, the surface tension of ultra-pure and deionised water, n-decane and n-dodecane were determined from (298 to 343)K and are in clos aggreement with literature values.
GLP compliance:
not specified
Type of method:
other: analysis of the shape of the pendant drop and measured using a Dataphysics contact angle system OCA-20

Test material

Constituent 1
Chemical structure
Reference substance name:
1-ethyl-3-methylimidazol-3-ium;acetate
EC Number:
604-344-8
Cas Number:
143314-17-4
Molecular formula:
C8H14N2O2
IUPAC Name:
1-ethyl-3-methylimidazol-3-ium;acetate
Test material form:
liquid
Specific details on test material used for the study:
1-Ethyl-3-methylimidazolium acetate, Iolitec GmbH

Results and discussion

Surface tensionopen allclose all
Key result
Surface tension:
ca. 47.1 mN/m
Temp.:
298.1 K
Conc.:
15 other: µL
Surface tension:
ca. 46.5 mN/m
Temp.:
308.2 K
Conc.:
15 other: µL
Surface tension:
ca. 45.9 mN/m
Temp.:
318.2 K
Conc.:
15 other: µL
Surface tension:
ca. 45.3 mN/m
Temp.:
328.2 K
Conc.:
15 other: µL
Surface tension:
ca. 44.7 mN/m
Temp.:
338.3 K
Conc.:
15 other: µL

Applicant's summary and conclusion

Executive summary:

The surface tension of 1 -Ethyl-3 -methylimidazolium acetate is approx. 47 mN/m at 25 °C