Home Nonfiction 10 • Charged Gels and Membranes: Part I by Karl Sollner (auth.), Eric Sélégny, George Boyd, Harry P. PDF

Charged Gels and Membranes: Part I by Karl Sollner (auth.), Eric Sélégny, George Boyd, Harry P. PDF

By Karl Sollner (auth.), Eric Sélégny, George Boyd, Harry P. Gregor (eds.)

ISBN-10: 9401014647

ISBN-13: 9789401014649

ISBN-10: 9401014663

ISBN-13: 9789401014663

The sequence on 'Charged and Reactive Polymers' was once set forth in volumes difficulty­ ing the basics and functions of polyelectrolytes. A follow-up on 'Charged Gels and Membranes' might accordingly look applicable, necessitating, notwithstanding, a few reason behind non-specialists. Theories of the main dilute gels originate in that of centred polyelectrolytes: the equipment and difficulties are comparable in structural, spectroscopic or thermodynamic homes. The borderline should be positioned in dialysis performed with a 'bag' imper­ meable to polyelectrolytes yet to not small ions, solutes and water. One might bear in mind Donnan's use of one of these procedure to test and notice his well-known legislations of unequal distribution of ions of alternative cost in and out. comment­ ably so, it's the distinction in scale which characterizes the variation among poly­ electrolyte recommendations and gels and membranes: the colloidal resolution of macro­ molecules is heterogeneous purely at the microscopic point, while the gel-solution process is a macroscopically heterogeneous one. A gel is shaped whilst susceptible or powerful cohesive forces counterbalance the dispersing ones (usually through crosslinking) with out inhibiting the penetration of solvent and of small solutes into the polymeric community. The solvophile macromolecules can't invade the full quantity of liquid. because of phase-segregation extra answer and gel coexist and have interaction. The macroscopic swelling relies on gel cross-linking in addition to on ionic focus and kind and ion-selectivities are observed.

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Additional resources for Charged Gels and Membranes: Part I

Sample text

For the further development of the fundamental electrochemistry of porous membranes it was, however, most unfortunate that Bethe and Toropoff presented their ideas only in a sketchy form, as a six page introduction to their 97 page report on membrane polarization [25,26J, and that they never returned to these most basic aspects of their work. Contemporary and many later investigators, including the author failed fully to understand and to utilize systematically the integrating conceptual scheme of Bethe and Toropoff.

If the liquid layer wetting the pore walls is positively charged one must assume a preponderance of cations in this immobile or less mobile layer of liquid, and in the interior of the pores a preponderance of anions. The converse holds true in the case of a negatively charged wall layer. (Author's translation) In a footnote to this statement Bethe and Toropoff make the following statement: A corresponding view, in our opinion will also hold true with respect to the changes in the potentials of concentration cells with interposed diaphragms.

He took the THE EARLY DEVELOPMENTS OF THE ELECTROCHEMISTRY OF POLYMER MEMBRANES 29 Bethe-Toropoff concept of a charged membrane for granted and speculated that a current caused by the membrane potential flows through the pore in the one direction and in the other direction through the porewalls, the material of which the membrane consists. g. clay or collodion, have a significant conductivity, whereas in fact they are insulators. However this may be, Freundlich's paper and his ensueing treatment of membrane problems in his book [19J were instrumental in drawing the attention of physical chemists to the electrochemistry of porous membranes.

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