D.C. conduction in swollen polar polymers. I. electrolysis of the keratin-water system

King, George E.; Medley, J. A.

doi:10.1016/0095-8522(49)90028-8

Cited by 47 publications

(14 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…(5) E,,, = 1.32 -0.017m (6) The unknown quantities Eo and m can now be computed from Eqs. (4), ( 5 ) , and (6), yielding Eo = 0.72 eV and r = 6.6 A. I n view of the obvious limitations of our model, the value of r seems to be reasonable. It corresponds to two of three hydrogen bonds, indicating that the ion pair formation process is not restricted to one hydrogen bond only.…”

Section: Mechanism Of Protonic Conductionmentioning

confidence: 90%

Electrical conduction in hydrated collagen. I. Conductivity mechanisms

Bardelmeyer

1973

Biopolymers

View full text Add to dashboard Cite

SynopsisThe electrical conductivity of bovine Achilles tendon with various amounts of adsorbed water was measured as a function of temperature. The conduction appeared t.0 be fully determined by the water of hydration. The current is probably primarily carried by protons a t water contents up to 45% and by small ions a t water contents beyond 65%. In both ranges of water content, a linear relation between activation energy and water content was found. As to the lower range, this is explained by the action of Coulombic forces during the separation of protonshydroxyl ion pairs. In two regions of water content a linear relation between the logarithm of the pre-exponential factor and the activation energy was found. There are, however, no indications that a compensation effect is responsible for this observation. It is concluded that at certain water contents the dissociation constant of the adsorbed water is several orders of magnitude higher than in liquid water.

show abstract

Section: Mechanism Of Protonic Conductionmentioning

confidence: 90%

Electrical conduction in hydrated collagen. I. Conductivity mechanisms

Bardelmeyer

1973

Biopolymers

View full text Add to dashboard Cite

show abstract

“…[ 11 ) , i.e.. proton translation via the H-bond system. The activation energy of conduction at 25% water content is -~ 16 kcal/g mole according to the results of King and ZZeclley ( 17] and Hearle [ 14], and this figure is very close to that of the activation energy of conduction in ice [21]. , Variation of Conductance 'with Tinre after a Step Change in Humidity For step changes 0 -~ 5~o RH and 0 -~ R~o RH, there was a small overshoot of conductance vs. time, with the final equilibrium value equal to that for dry fibers.…”

Section: Contentmentioning

confidence: 99%

“…Baxter [7] measured the temperature coefficients of conduction at various water contents and claimed that the conduction process was similar to that in ice and that it was a type of electronic semi-conduction. King and Medley [17] J proved that ions were capable of moving during conduction in keratin equilibrated at c.)O~~o ItII, hy collecting gases evolvecl at the electrodes. Their work was a continuation to a certain extent of experiments carried out by O'SuIlivan ~21 J ull the movement of ions in cellulose.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Changes in the Relative Humidity on the Electrical Conductivity of Wool Fibers

Algie

Watt

1965

Textile Research Journal

View full text Add to dashboard Cite

The changes which take place in the electrical conductance of wool fibers, following the application of sudden changes in the humidity from zero up to various values, have been studied as a function of time. There is an initial rapid increase followed by a long-term increase or decrease in the conductance (depending upon the final relative humidity). The changes have been related to changes in the mobility of the absorbed water. Structural modifications produced by a setting process also have been found to affect the conductance. It has been concluded that wool fibers cannot be considered as a fixed unchanging substrate for absorption as changes in the relation between water content and conductivity occur during the absorption process and as a result of the fibers past absorption history.

show abstract

“…One example is the replacement reaction RF + Τ ->• RT + F which has been observed to proceed with high yield when R has a low moment of inertia (C being the axis), e.g. when R is CH 3 ; the reaction proceeds to a much lesser extent when R has a high moment of inertia, e. g. when R is CH 2 F or CHF 2 [5]. This effect may be attributed to a high probability of interaction of the projectile X* with the R-H bond, i. e. with the molecule taken as a unit and the collision taking place at a point between R and H. This may result in re-orientation of the bonding electrons of the R radical toward X* to form a new bond with X*, through a short-lived intermediate complex RYX*.…”

Section: The Simple Collision Modelmentioning

confidence: 98%

“…When X* atoms of high kinetic energy E 0 > E 2 are stopped in an infinitely thick medium of R Y molecules, the total reaction probability (or "thick target yield") for displacement reactions, using only kinetic energy considerations, is given by an integral [5],…”

Section: Evaluation Of Reaction Probabilitiesmentioning

confidence: 99%

A Criterion for Selectivity in Recoil Labeling

Amiel¹,

Paiss²

1965

Radiochimica Acta

View full text Add to dashboard Cite

Atoms formed in different types of nuclear processes often differ in their major physical properties. For example, a nuclide formed as a fragment in a nuclear reaction has a different initial kinetic energy and charge state from those for the same nuclide produced in radioactive decay. An examination of such properties was made with the aim of deriving parameters leading to selectivity in "hot" displacement reactions, when atoms produced by different nuclear processes recoil into appropriate stopping media. Different probabilities of labeling were inferred from revised versions of the Billiard-Bali Collision Model and from scavenging effects. The conclusions are examined in the light of the experimental results obtained for the displacement reaction: I* + CH 4 CH 3 I* + H, where the labeling atom is a fission fragment, an atom recoiling after neutron capture, or a beta decay product. Possible applications of selective labeling for the separation of primary nuclear reaction products from the same nuclides produced by radioactive decay, are discussed. ZusammenfassungAtome aus verschiedenen Kernprozessen unterscheiden sich oft in ihren physikalischen Eigenschaften. So haben als Fragmente einer Kernreaktion entstehende Nuklide andere kinetische Anfangsenergien und Ladungen als gleiche Nuklide aus dem radioaktiven Zerfall. Wir untersuchten solche Eigenschaften, um Parameter für selektive "heiße" Substitutionen zu gewinnen, bei denen Atome aus verschiedenen Kernprozessen in geeigneten Medien gebremst werden. Verschiedene Markierungswahrscheinlichkeiten wurden aus verbesserten Billardball-Stoßmodellen und Auffangeffekten abgeleitet. Die Schlüsse wurden an den experimentellen Daten für die Substitution J* + CH 4 -> CH 3 J* + H geprüft, wobei das Markierungsatom durch Spaltung, Neutroneneinfang oder ß-Zerfall gebildet wurde. Die Möglichkeit, durch selektive Markierung Primärprodukte von Kernreaktionen von den beim radioaktiven Zerfall entstehenden gleichen Nukliden abzutrennen, wird diskutiert. RésuméLes atomes dérivant de différents types de processus nucléaires ont souvent des propriétés physiques différentes. Par exemple, un noyau issu d'une réaction nucléaire possède à l'origine une autre énergie cinétique et une autre charge que celui produit par désintégration radioactive. Nous avons étudié de telles propriétés dans le but d'obtenir une sélectivité des réactions de déplacement « chaudes » lors du recul dans des milieux appropriés d'atomes issus de différents processus nucléaires. On en a déduit différentes valeurs pour la probabilité de marquage en utilisant la théorie révisée de la collision des boules de billard et les effets de balayage. Les conclusions sont examinées à la lueur des résultats expérimentaux de la réaction I* • | CH 4 -> CH3I* + H où l'atome marqué est produit par fission, capture de neutron, ou désintégration β. On discute l'utilisation de ce marquage sélectif pour la séparation des produits primaires de réactions nucléaires d'atomes semblables produits par désintégration radioactive.

show abstract

D.C. conduction in swollen polar polymers. I. electrolysis of the keratin-water system

Cited by 47 publications

References 10 publications

Electrical conduction in hydrated collagen. I. Conductivity mechanisms

Electrical conduction in hydrated collagen. I. Conductivity mechanisms

The Effect of Changes in the Relative Humidity on the Electrical Conductivity of Wool Fibers

A Criterion for Selectivity in Recoil Labeling

Contact Info

Product

Resources

About