Studies on the Porous Disc Method of measuring and L. H. Osmotic Pressure

Martin, F. T.; Schultz, L. H.

doi:10.1021/j150320a022

Cited by 5 publications

(1 citation statement)

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“…In the rest of this paper, the subject-matter will be restricted to the field of porousdisk osmometry. The classical work of Frazer & Patrick (1927) was extended by subsequent investigators in the U.S.A. (Eichelberger 1931;Martin & Schulz 1931;Townend 1928) and Germany (Wohl 1937;Hess& Suranyi 1939;Ulmann 1931Ulmann ,1933, but the essential features were preserved. In all cases the measured osmotic pressures were sufficiently large to justify the use of a column of mercury in the reference arm for the measurement of the hydrostatic drag, whereas figure 1 in this paper shows an all-solvent system th at is more suitable for low osmotic pressures.…”

Section: E Xperimental Backgroundmentioning

confidence: 98%

The mechanism of isothermal distillation in the porous-disk osmometer

Williamson¹

1948

Proc. R. Soc. Lond. A

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This paper describes the theoretical investigations which have been made in an effort to clarify several well-established but unexplained observations by previous workers who have carried out experiments by the unusual osmotic-pressure technique known as isothermal distillation. The treatment is essentially thermodynamic, and leads to the derivation of equations which agree with the accumulated experimental evidence while showing how substantial improvements in performance can be achieved by designing the apparatus in accordance with the guidance given by the theoretical study. One of the derived equations stresses the importance of good thermal conduction between the solvent and solution inside the stillhead, while another gives a quantitative relationship between thermostat temperature fluctuations and osmoticpressure errors. A description is then given of the essential features of the experimental apparatus which has been built for the application of these theoretical advances to the measurement of the molecular weights of high polymers.

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Section: E Xperimental Backgroundmentioning

confidence: 98%

The mechanism of isothermal distillation in the porous-disk osmometer

Williamson¹

1948

Proc. R. Soc. Lond. A

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An osmometer with an ideal semipermeable boundary

Pals

Staverman

1957

J. Polym. Sci.

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An osmometer has been constructed in which the only possible transition from one cell to the other is through the vapor phase. In this way the problem of passage of solute is completely eliminated. In order to obtain a sufficient rate of transition of solvent, the distance between the cells has been made as small as possible. An osmometer with a vapor “membrane” of 0.05 mm. thickness is described and measurements with this osmometer are reported.

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