Low frequency dielectric study on hydrated ovalbumin

Dielectric properties of a protein–water system in selected animal tissues

“…The data obtained in this paper supported the earlier dielectric results for various proteins [17][18][19][20][21], which indicate that water significantly affects the a-dispersion region. The temperature dependencies of the complex permittivity of the tissues studied suggest the important role of water in the stabilisation of the collagen and keratin macromolecule structure.…”

“…So, the available literature gives the results of the dielectric properties of human and animal tissues in incomplete adispersion region, i.e., starting from 10 Hz [10][11][12][13][14][15][16]. More information on the dielectric behaviour of biological materials in the a-dispersion has been collected for proteins [3,[17][18][19][20][21]. The results collected for proteins indicate that the dispersion in them is influenced by the water content of the samples, which is manifested by a shift of the characteristic dispersion frequency towards higher frequencies.…”

Atomic scale characterization and surface chemistry of metal modified titanate nanotubes and nanowires

“…Arrhenius-type temperature dependence is found indeed for all water amounts, whereas the 1/T type behavior of the second term in the right hand side has been verified earlier in hydrated collagene [159]. Since increasing the surface coverage can results in both decreasing [107,117,133,140,[160][161][162][163][164][165] and increasing [159,[166][167][168][169][170][171] activation energies, non-monotonous trends [116,172] are likely to be due to the simultaneous occurence of the different processes. Earlier it was assumed that the dynamics is governed by charge carrier generation and transfer processes [107].…”

“…activation energies of various relaxation processes decreased with increasing surface coverage in clay materials [162] and polymer composites [165] but increased in Fe 2 O 3 [156], Ag 2 O [168], silica [170,176], calcium-silicate-hydrate [157,158] and ovalbumine adsorbents [166,171].…”

The role of bulk charge transport processes in electrical tree formation and breakdown mechanisms in epoxy resins

“…In hydrated biopolymers [24][25][26], which have been found to have a similar dielectric response to that of the epoxy resin presented in Figure 4, it was suggested that proton transfer is responsible for the long-range charge transport QDC mechanism, and some evidence for isotope dependence has been presented in [25] supporting this hypothesis. The chemical composition of the epoxy resin systems also has the potential for proton transfer, with proton donors, such as salicylic acid, often being used to facilitate polymerization and accelerate the final curing reaction [27] between hardeners such as diamine and the epoxide groups.…”