Dielectric Constant of Polyhydric Alcohol–DMSO Mixture Solution at the Microwave Frequency

Abstract

Dielectric spectrum of polyhydric alcohol (1,2,3)-DMSO (dimethyl sulfoxide) mixtures, at full concentration, have been determined by the dielectric relaxation spectroscopy (DRS) method at frequencies from 20 MHz to 20 GHz at room temperature. The mixture behavior is described according to four Davidson-Cole terms whose evolution with composition is analyzed. The binding energies and hydrogen bond (HB) numbers between solute-solute and solvent-solute pairs are obtained from the permittivity using the Luzar model. The average HBs number associated with DMSO decreases with increasing mole fraction of DMSO. The binding energy of solute-solute (E11) and solvent-solute (E12) interaction decreases with the increased numbers of carbon atoms in the alcohols.

Investigation of Nonlinear Output-Input Microwave Power of DMSO-Ethanol Mixture by Molecular Dynamics Simulation

“…Figure 1 depicts the experimental system and the ratio of output versus input microwave power with different mole fraction DMSO-ethanol mixtures and pure DMSO. The interaction between microwave and substances mainly embodies in microwave absorption and reflection, which strongly correlate with the medium’s dielectric property 58 . Nonlinear output-input microwave power appears after a threshold (“critical point”) input power suggests the redistribution of microwave energy and dielectric property changes in DMSO-ethanol mixtures, which are viewed as evidence of non-thermal microwave effect.…”

“…Both of them are commonly used in microwave heating as polar solvents. Several works have demonstrated that DMSO-ethanol mixture exhibits properties deviating from ideal due to the intrinsical variation of hydrogen bonding interaction 55 – 58 . In the case of experiment, we have deduced that the nonlinear behaviors of the DMSO-ethanol mixture are related to the alteration of hydrogen bonds, which caused by the application of microwave.…”

Dielectric Behavior of Reaction Mixture during Acid-Catalyzed Transesterification Reactions in Biodiesel Production

“…The loss tangent, which is defined by '' tan / ' ef δ ε ε = , is an 3 important parameter in describing the dielectric response of materials. 1,2,6 For example, the penetration depth (D p) , the distance at which the amplitude of the electrical field is damped to 1/e = 0.369 of its initial value at the surface of the material, is related to the loss tangent by 6 1/ 2 2 2 1 tan 1 ' Over recent years the dielectric properties of alcohols and their mixtures have been extensively studied [7][8][9][10][11][12][13][14][15][16] and the dielectric properties of pure solvents have become widely available in the literature. [17][18] However, data on the dielectric behavior of vegetables oils, animal fats, or even their mixtures with primary alcohols, are scarce.…”

Rapid growth of the CH3NH3PbCl3 single crystal by microwave irradiation

“…Dimethyl sulfoxide (DMSO) was selected as a solvent due to its excellent performance for dissolving CH 3 NH 3 Cl and PbCl 2 . 14,21 In addition, as an aprotic polar solvent, DMSO also plays an important role in kinetic reaction owing to its high microwave absorbing feature with permittivity (3) z 47 and loss factor (tan d) ¼ 0.825 at the frequency of 2.45 GHz in 20 C. 22,27,28 The commercial microwave that used can be adjusted based on two parameters, i.e., duty cycle and irradiation time. The low duty cycle mode is the most reliable mode to prepare the crystal bulk since excessive evaporation has occurred when medium or high duty cycle mode was used for a minute.…”