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Total dielectric saturation observed in a dipolar solution
Volume 4. number 1
TOTAL
CHEMICAL PHYSICS LETTERS
DIELECTRIC
SATURATION
OBSERVED
15 September 1969
IN
A DIPOLAR
SOLFJTXON
G. PARRY JONES and M. GREGSUN Physics
Bepartmeti,
Uniuwsify
Coltege
of No&ah W&es,
m%,,Gw , mwY?&?...~TJK
and The Edtvard Davies Citentical Laboratory, University College of Wales, A~e~s~uyt~t, Cards.
I UK
Received 28 July 1969
IIn recent year5 systematic dielectric saturation studies in liquid systems have been made by P&@&?.FZa
in dioxan [3] show that the solute behaves, at concentrations up to those used in this work, as ef-
f+?&we~~ r@.!d &.?&&zp,e, riri& a, G%&&? %Bwz+%z*t nf,
the order of 1000 D and a mean critical frequency of about 1000 Hz. A plot of AA E’ against the Langevin function of the field gives a correct linear dependence but as is also seen in fig. 1, the extrapolation to zero fieid does not give AAe’ = 0 but rather a value of +0.03. This can be inter-
1
AAE!
-0.24 -02 J Fig. I. Plot of dielectric saturation d&E’ against electric field E for a solution of poIy@enzyl-Gglutamate) in dioxan (0.03305 g/100 cm3) measured at frequency of 1592 Hz and temperature of 15.5°C.
~~ob.&e 4. number 3.
CXEMICAL PIi?%ICS LETTERS
preted 5s an increase in the effective dipole mo: ment of about 6%. This anomaly in the extrapalation from high fields if confirmed at other lower frequencies. could arise inter aliafrom a.
15 September 1969
Furth45rmeasurements are in progress in an attempt to elucidate the divergence from the Langevin function at low fields.
field effect on the effective moment of the solute in this sofvent. The synthetic polypeptide is in
the a-helix form and some distortions of this configuration may be induced by the high applied fields. It will be noted that practically camplete dielectric saturation has been achieved in this soh~tion since p-E x= kT, for the largest applied fields.
34
[l] A. Piekara, J. Chem. Phys. 36 (1962) 2145. [Z] See also observations by I-I Block and E. F. Byes. Chem. Commuo, (1969) 77. j3] M. Sharp. Ph.D. Thesis. University of Wales (unpubfishe@ (%X6} ; A. Wada. J. Chem. Phys. 28 (1958) 674: 30 (X969) 32%; 329.
TOTAL
CHEMICAL PHYSICS LETTERS
DIELECTRIC
SATURATION
OBSERVED
15 September 1969
IN
A DIPOLAR
SOLFJTXON
G. PARRY JONES and M. GREGSUN Physics
Bepartmeti,
Uniuwsify
Coltege
of No&ah W&es,
m%,,Gw , mwY?&?...~TJK
and The Edtvard Davies Citentical Laboratory, University College of Wales, A~e~s~uyt~t, Cards.
I UK
Received 28 July 1969
IIn recent year5 systematic dielectric saturation studies in liquid systems have been made by P&@&?.FZa
in dioxan [3] show that the solute behaves, at concentrations up to those used in this work, as ef-
f+?&we~~ r@.!d &.?&&zp,e, riri& a, G%&&? %Bwz+%z*t nf,
the order of 1000 D and a mean critical frequency of about 1000 Hz. A plot of AA E’ against the Langevin function of the field gives a correct linear dependence but as is also seen in fig. 1, the extrapolation to zero fieid does not give AAe’ = 0 but rather a value of +0.03. This can be inter-
1
AAE!
-0.24 -02 J Fig. I. Plot of dielectric saturation d&E’ against electric field E for a solution of poIy@enzyl-Gglutamate) in dioxan (0.03305 g/100 cm3) measured at frequency of 1592 Hz and temperature of 15.5°C.
~~ob.&e 4. number 3.
CXEMICAL PIi?%ICS LETTERS
preted 5s an increase in the effective dipole mo: ment of about 6%. This anomaly in the extrapalation from high fields if confirmed at other lower frequencies. could arise inter aliafrom a.
15 September 1969
Furth45rmeasurements are in progress in an attempt to elucidate the divergence from the Langevin function at low fields.
field effect on the effective moment of the solute in this sofvent. The synthetic polypeptide is in
the a-helix form and some distortions of this configuration may be induced by the high applied fields. It will be noted that practically camplete dielectric saturation has been achieved in this soh~tion since p-E x= kT, for the largest applied fields.
34
[l] A. Piekara, J. Chem. Phys. 36 (1962) 2145. [Z] See also observations by I-I Block and E. F. Byes. Chem. Commuo, (1969) 77. j3] M. Sharp. Ph.D. Thesis. University of Wales (unpubfishe@ (%X6} ; A. Wada. J. Chem. Phys. 28 (1958) 674: 30 (X969) 32%; 329.