Surface tension corrections in density measurements using density gradient columns

Ziabicki, Andrzej; Wasiak, Andrzej

doi:10.1007/bf01520397

Cited by 8 publications

(2 citation statements)

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“…For the system with the solid held in a fixed position, eqn (6) can be integrated at constant chemical potential and constant interfacial tension within each slice Sz giving…”

Section: Restraining and Propelling Forcesmentioning

confidence: 99%

“…Eqn (1 I ) can be differentiated and eqn (6) subtracted giving the appropriate form of the Gibbs-type adsorption equation : The restraining force exerted on the solid to keep it at rest is c'A*G/c'C, whence Eqn (14) implies that a restraining force will be required to prevent motion if the particle area, A , varies with position, (, at constant particle/solution interfacial tension, os. z .…”

Section: Restraining and Propelling Forcesmentioning

confidence: 99%

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Origin of idealized static thermodynamic forces inducing solid particle motion, orientation and related effects in a solute concentration gradient

Boucher¹

1987

J. Chem. Soc., Faraday Trans. 1

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“…For the system with the solid held in a fixed position, eqn (6) can be integrated at constant chemical potential and constant interfacial tension within each slice Sz giving…”

Section: Restraining and Propelling Forcesmentioning

confidence: 99%

Section: Restraining and Propelling Forcesmentioning

confidence: 99%

Origin of idealized static thermodynamic forces inducing solid particle motion, orientation and related effects in a solute concentration gradient

Boucher¹

1987

J. Chem. Soc., Faraday Trans. 1

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Sources of error in bulk polymer densities determined by the gradient column technique

Blackadder

Keniry

1971

Makromol. Chem.

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Sources of error in the determination of the density of bulk‐crystallized polyethylene in gradient columns have been reconsidered. Preferential absorption of any one column liquid can lead to gross differences between the apparent polymer densities as determined in different columns. It is therefore important to select column liquids which have about the same swelling power for the polymer. Samples of very high specific surface should be avoided, though the threshold for significant errors of this kind is unlikely to be crossed in practice. Finally, water should not be used as a column liquid in connection with polyethylene measurements because water‐rich mixtures may not wet the polymer completely. The principles emerging from this work are likely to be of general application.

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Thermodynamic and physical properties of crystals formed from dilute solutions

Mandelkern

1969

Polymer Engineering & Sci

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Some of the thermodynamic and physical properties of crystals of linear polyethylene, formed from dilute solution are discussed. These properties include density, enthalpy of fusion, infrared absorption spectrum, selective oxidation and dynamic mechanical measurements. Despite the fact that electron microscopic examination reveals an apparent geometric regularity to these crystals, all these physical measurements yield a consistent interpretation in that they require about 15–20% of the chain units to be in a non‐random conformation, and to form a disordered amorphous overlayer. Detailed studies of the experimentally observed relations between the crystallite thickness, crystallization temperature, and dissolution temperature (melting temperature in a dilute solution) are also presented. A thermodynamic analysis of the dissolution temperature‐size relations, based on independently determined equilibrium solubility temperatures, indicates that the interfacial free‐energy characteristic of the mature crystallites is significantly different from that involved in nucleation. The interfacial structures of the nucleus and the crystallites must, therefore, also be different. Size control by a nucleation process can be demonstrated from very general theoretical considerations. However, the detailed molecular structure characteristic of the nucleus cannot be specified solely from the fact that this process is size controlling.

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Surface tension corrections in density measurements using density gradient columns

Cited by 8 publications

References 8 publications

Origin of idealized static thermodynamic forces inducing solid particle motion, orientation and related effects in a solute concentration gradient

Origin of idealized static thermodynamic forces inducing solid particle motion, orientation and related effects in a solute concentration gradient

Sources of error in bulk polymer densities determined by the gradient column technique

Thermodynamic and physical properties of crystals formed from dilute solutions

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