Dielectric Relaxation in Glycerol, Propylene Glycol, and n-Propanol

Journal of Chemical Physics - Tập 19 Số 12 - Trang 1484-1490 - 1951
D. W. Davidson1, Robert H. Cole1
1Metcalf Research Laboratory, Brown University, Providence, Rhode Island

Tóm tắt

Complex dielectric constants have been measured at frequencies from below 20 c/s to 5 mc/s over the temperature range −40° to −75°C in glycerol, −45° to −90° in propylene glycol, and −80° to −140° in n-propanol. The results for n-propanol are described by the Debye equation, but the values for the other two require a modified equation corresponding to a broader range of dispersion at higher frequencies. In all three liquids, evidence is found for a second dispersion region at still higher frequencies, which accounts for much of the difference between the radio frequency and optical dielectric constant. The relaxation times are quantitatively described over wide ranges by an empirical rate equation of a form which also fits viscosity data. The significance of the various results is discussed.

Từ khóa


Tài liệu tham khảo

1950, J. Chem. Phys., 18, 1417

1934, Trans. Am. Electrochem. Soc., 65, 109, 10.1149/1.3498002

1932, Physics, 2, 313, 10.1063/1.1745059

1950, J. Am. Chem. Soc., 72, 2075, 10.1021/ja01161a055

1949, Rev. Sci. Instr., 20, 252, 10.1063/1.1741505

1951, Rev. Sci. Instr., 22, 678, 10.1063/1.1746034

1936, J. Am. Chem. Soc., 58, 1486, 10.1021/ja01299a050

1939, J. Chem. Phys., 7, 911, 10.1063/1.1750343

1943, J. Chem. Phys., 11, 175, 10.1063/1.1723823

1949, Bull. Soc. Chim. France, 16, 353

1926, Z. Anorg. Allgem. Chem., 156, 245, 10.1002/zaac.19261560121

1938, J. Tech. Phys. U.S.S.R., 5, 413

1948, Chem. Revs., 43, 219, 10.1021/cr60135a002

1941, J. Am. Chem. Soc., 63, 385, 10.1021/ja01847a013

1938, J. Am. Chem. Soc., 60, 779, 10.1021/ja01271a013

1942, Revs. Modern Phys., 14, 12, 10.1103/RevModPhys.14.12

1931, Phys. Rev., 38, 1224, 10.1103/PhysRev.38.1224

1936, Proc. Roy. Soc. (London), A154, 138

1946, Trans. Faraday Soc., 42A, 40

1945, Bull. Soc. Chim. France, 12, 207

1947, J. Chem. Phys., 44, 313