物理化学学报 >> 2007, Vol. 23 >> Issue (10): 1508-1514.doi: 10.1016/S1872-1508(07)60076-X

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时域反射光谱法研究酰胺-醇混合物的介电驰豫

RAMACHANDRAN K.; SIVAGURUNATHAN P.; DHARMALINGAN K.. MEHROTRA S. C.   

  1. Department of Physics, SRMUniversity, Kattankulathur-603 203, Tamilnadu, India; Department of Physics, Annamalai University, Annamalai Nagar-608 002, Tamilnadu, India; Department of Electronics and Computer Science, Dr. B. A. M. University, Aurangabad-431 004, Maharashtra, India
  • 收稿日期:2007-05-07 修回日期:2007-06-28 发布日期:2007-10-01
  • 通讯作者: RAMACHANDRAN K. E-mail:ramach76@yahoo.com

Dielectric Relaxation Study of Amide-Alcohol Mixtures by Using Time Domain Reflectometry

RAMACHANDRAN K.; SIVAGURUNATHAN P.; DHARMALINGAN K.. MEHROTRA S. C.   

  1. Department of Physics, SRMUniversity, Kattankulathur-603 203, Tamilnadu, India; Department of Physics, Annamalai University, Annamalai Nagar-608 002, Tamilnadu, India; Department of Electronics and Computer Science,
    Dr. B. A. M. University, Aurangabad-431 004, Maharashtra, India
  • Received:2007-05-07 Revised:2007-06-28 Published:2007-10-01
  • Contact: RAMACHANDRAN K. E-mail:ramach76@yahoo.com

摘要: Using time domain reflectometry (TDR), dielectric relaxation studies were carried out on binary mixtures of amides (N-methylformamide (NMF), N,N-dimethylformamide (DMF)) with alcohols (1-butanol, 1-pentanol, 1-hexanol, 1-heptanol, 1-octanol, and 1-decanol) for various concentrations over the frequency range from 10 MHz to 10 GHz at 303 K. The Kirkwood correlation factor and excess dielectric constant properties were determined and discussed to yield information on the molecular interactions of the systems. The relaxation time varied with the chain length of alcohols and substituted amides were noticed. The Bruggeman plot shows a deviation from linearity. This deviation was attributed to some sort of molecular interaction which may take place between the alcohols and substituted amides. The excess static permittivity and excess inverse relaxation time values varied from negative to positive for all the systems indicating that the solute-solvent interaction existed between alcohols and substituted amides for all the dynamics of the mixture.

关键词: Dielectric relaxation, Time domain reflectometry, Bruggeman factor, Kirkwood correlation factor

Abstract: Using time domain reflectometry (TDR), dielectric relaxation studies were carried out on binary mixtures of amides (N-methylformamide (NMF), N,N-dimethylformamide (DMF)) with alcohols (1-butanol, 1-pentanol, 1-hexanol,
1-heptanol, 1-octanol, and 1-decanol) for various concentrations over the frequency range from 10 MHz to 10 GHz at 303 K. The Kirkwood correlation factor and excess dielectric constant properties were determined and discussed toyield information on the molecular interactions of the systems. The relaxation time varied with the chain length of alcohols and substituted amides were noticed. The Bruggeman plot shows a deviation from linearity. This deviation was attributed to some sort of molecular interaction which may take place between the alcohols and substituted amides. The excess static permittivity and excess inverse relaxation time values varied from negative to positive for all the systems indicating that the solute-solvent interaction existed between alcohols and substituted amides for all the dynamics of the mixture.

Key words: Dielectric relaxation, Time domain reflectometry, Bruggeman factor, Kirkwood correlation factor