The Influence of Hindered Molecular Rotation on the Dielectric Constants of Water, Alcohols, and Other Polar Liquids

1943 ◽  
Vol 11 (4) ◽  
pp. 175-178 ◽  
Author(s):  
Gerald Oster ◽  
John G. Kirkwood
Keyword(s):  
Molecular Rotation ◽  
Dielectric Constants ◽  
Polar Liquids

scholarly journals Poly (Dimethylsiloxane) Coating for Repellency of Polar and Non-Polar Liquids

Polymers ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2423
Author(s):  
Hila Monder ◽  
Leo Bielenki ◽  
Hanna Dodiuk ◽  
Anna Dotan ◽  
Samuel Kenig
Keyword(s):  
Contact Angle ◽  
Empirical Model ◽  
Room Temperature ◽  
Contact Angle Hysteresis ◽  
Dielectric Constants ◽  
Solubility Parameters ◽  
Polar Liquids ◽  
The Difference ◽  
Liquid Repellency ◽  
Pdms Coating

The wettability of poly (dimethylsiloxane) (PDMS) coating on plasma-treated glass was studied at room temperature using polar and non-polar liquids. The wettability was investigated regarding the liquids’ surface tensions (STs), dielectric constants (DCs) and solubility parameters (SPs). For polar liquids, the contact angle (CA) and contact angle hysteresis (CAH) are controlled by the DCs and non-polar liquids by the liquids’ STs. Solubility parameter difference between the PDMS and the liquids demonstrated that non-polar liquids possessed lower CAH. An empirical model that integrates the interfacial properties of liquid/PDMS has been composed. Accordingly, the difference between the SPs of PDMS and the liquid is the decisive factor affecting CAH, followed by the differences in DCs and STs. Moreover, the interaction between the DCs and the SPs is of importance to minimize CAH. It has been concluded that CAH, and not CA, is the decisive attribute for liquid repellency of PDMS coating.

Universal nomograms for measurement of UHF dielectric constants of polar liquids

1975 ◽  
Vol 18 (2) ◽  
pp. 294-296
Author(s):  
R. M. Kasimov ◽  
S. M. Useinova
Keyword(s):  
Dielectric Constants ◽  
Polar Liquids

Dielectric constant measurements of thin films and liquids using terahertz metamaterials

RSC Advances ◽  
2016 ◽  
Vol 6 (73) ◽  
pp. 69381-69386 ◽  
Author(s):  
S. J. Park ◽  
S. A. N. Yoon ◽  
Y. H. Ahn
Keyword(s):  
Thin Films ◽  
Dielectric Constant ◽  
Polymer Films ◽  
Dielectric Constants ◽  
Polar Liquids ◽  
Terahertz Metamaterials

In this paper, we demonstrate that terahertz (THz) metamaterials are powerful tools for determination of dielectric constants of polymer films and polar liquids.

scholarly journals An Empirical Relation for the Evaluation of the Dielectric Relaxation Time of Certain Polar Liquids Using a Single Microwave Frequency

1974 ◽  
Vol 27 (1) ◽  
pp. 87 ◽  
Author(s):  
BS Sarma ◽  
V Venkateswara Rao
Keyword(s):  
Experimental Data ◽  
Relaxation Time ◽  
Dielectric Relaxation ◽  
Concentration Factor ◽  
Empirical Relation ◽  
Microwave Frequency ◽  
Dielectric Constants ◽  
Dielectric Relaxation Time ◽  
Polar Liquids

An empirical relation is proposed for the determination of the dielectric relaxation time .. of polar liquids with nearly spherical molecules from measurements of the dielectric constants at a single microwave frequency. The relation is obtained by introducing a concentration factor as a parameter in the expression for .. derived by Eyring et al. (1941). Its validity for suitable polar liquids is demonstrated by comparison of results with previously reported values. Thermodynamic parameters for a number of liquids at various concentrations have also been evaluated from experimental data using the relation.

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