Relaxation phenomena of polar non-polar liquid mixtures under low and high frequency electric field

Pramana

S Acharyya¹  K Dutta1¹  S K Sit¹ 

[1] Department of Physics, Raiganj College (University College), P.O. Raiganj, Dist. Uttar Dinajpur 733 134, India$$

关键词: Relaxation time;    hf conductivity;    dipole moment.;   

DOI  :  

学科分类：物理（综合）

来源: Indian Academy of Sciences

【 摘 要 】

Simultaneous calculation of the dipole moment 𝜇𝑗 and the relaxation time 𝜏𝑗 of a certain number of non-spherical rigid aliphatic polar liquid molecules (𝑗) in non-polar solvents (𝑖) under 9.8 GHz electric field is possible from real $𝜖'𝑖𝑗$ and imaginary $𝜖''𝑖𝑗$ parts of the complex relative permittivity $𝜖^{*}_{𝑖𝑗}$. The low frequency and infinite frequency permittivities 𝜖0𝑖𝑗 and 𝜖∞ 𝑖𝑗 measured by Purohit et al [1,2] and Srivastava and Srivastava [3] at 25, 35 and 30°C respectively are used to obtain static 𝜇𝑠. The ratio of the individual slopes of imaginary 𝜎𝑖𝑗 and real $𝜎'𝑖𝑗$ parts of high frequency (hf) complex conductivity $𝜎^{*}_{𝑖𝑗}$ with weight fractions 𝑤𝑗 at 𝑤𝑗 → 0 and the slopes of $𝜎''_{𝑖𝑗}-𝜎'_{𝑖𝑗}$ curves for different 𝑤𝑗s [4] are employed to obtain 𝜏𝑗s. The former method is better in comparison to the existing one as it eliminates polar–polar interaction. The hf 𝜇𝑗s in Coulomb metre (C m) when compared with static and reported 𝜇s indicate that 𝜇ss favour the monomer formations which combine to form dimers in the hf electric field. The comparison among 𝜇s shows that a part of the molecule is rotating under X-band electric field [5]. The theoretical 𝜇theos from available bond angles and bond moments of the substituent polar groups attached to the parent molecules differ from the measured 𝜇𝑗s and 𝜇s to establish the possible existence of mesomeric, inductive and electromeric effects in polar liquid molecules.

【 授权许可】

Unknown