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Temperature dependence of dielectric constant at 10 GHz of Na‐DNA gels
Author(s) -
Bonincontro A.,
Di Biasio A.,
Pedone F.
Publication year - 1986
Publication title -
biopolymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.556
H-Index - 125
eISSN - 1097-0282
pISSN - 0006-3525
DOI - 10.1002/bip.360250206
Subject(s) - chemistry , dielectric , relaxation (psychology) , permittivity , aqueous solution , yield (engineering) , dna , analytical chemistry (journal) , molecule , dielectric loss , thermodynamics , chromatography , organic chemistry , materials science , psychology , social psychology , biochemistry , physics , optoelectronics
Permittivity ε′ and dielectric loss ε″ of aqueous Na‐DNA gels have been measured at 10 GHz in the temperature interval −15 to + 45°C. The experimental results are analyzed in terms of a three‐component equation (Na‐DNA, interfacial water, bulk water) and yield a value of 35 water molecules/nucleotide interacting with DNA. According to theoretical and experimental data the presence of strongly bonded and weakly bonded water is considered. The modified water exhibits a mean dielectric relaxation time two‐or threefold greater than that of bulk water.