Study On The Structure Of NH₄Cl Aqueous Solution Under Strong Magnetic Field

There is an inseparable relation between the microstructure and macroscopic properties of the electrolyte aqueous solution.The magnetic effect of substance provides a wealth of information about the structure of substance,the various interactions within matter,and the various physical properties caused by it.The nature and change of the aqueous solution structure affected by strong magnetic field can be revealed by studying the influence of strong magnetic field on the microstructure and macroscopic properties of aqueous solution,which provides an appropriate theoretical basis for the study of the relation between macroscopic properties and microstructure of aqueous solution.In this study,the changes of microstructure and macroscopic properties of NH₄Cl aqueous solution with different magnetic field intensity and mass fractions were investigated by X-ray diffraction,Raman spectroscopy,ultraviolet spectroscopy,contact angle measurement,viscosity measurement and molecular simulation.Comparing the experimental data with the molecular simulation data to find the law of change.The experimental results showed that:the saturation magnetization time and demagnetization memory time existed in NH₄Cl solution after magnetization by strong magnetic field.The saturation magnetization time showed a decreasing trend with the increase of the mass fraction and gradually decreased with the increase of the intensity of the strong magnetic field.The demagnetization memory time showed a rising trend with the increase of the mass fraction and magnetic field intensity.The strong magnetic field reduced the O-O interaction between the atoms in the aqueous solution,destroyed the hydrogen bonds in the water molecules,gradually increased the O-H stretching vibration in the water molecules,making the DDAA type hydrogen bond cluster structure decrease.The ultraviolet absorption intensity increased exponentially with the decrease of the wavelength in a short wavelength.The index got slower with the increase of the mass fraction of the NH₄Cl aqueous solution.Magnetization mechanism of NH₄Cl electrolyte solution:the effect of the strong magnetic field on water molecules in solution played a dominant role in low mass fractions.The lorentz force generated by the strong magnetic field caused the protons of the water molecules to produce electric current,which broke the hydrogen bonds in the water molecules and encouraged the hydrogen bond cluster structure between the water molecules to generate electric current and interacted with each other.In high mass fractions,the action of strong magnetic field was mainly determined by the ion response.Under the action of strong magnetic field,the migration rate of the two ions gradually improved with the increase of NH₄⁺and Cl^-.It disturbed the hydrogen bond network of adjacent water molecules.NH₄⁺interacted with Cl^-under the influence of the strong magnetic field,carrying current and moving in the strong magnetic field.Therefore,the change of the structure of NH₄Cl aqueous solution in strong magnetic field were caused by the structure of hydrogen bond clusters in water molecules,the addition of NH₄⁺and Cl^-under the action of lorentz force.The viscosity gradually enhanced with the increase of the strength of the strong magnetic field.With the mass fraction increased,the viscosity decreased firstly and then increased.The NH₄Cl aqueous solution of 10%had the lowest viscosity.The contact angle gradually decreased with the increase of the strength of the strong magnetic field.It increased with the raise of the mass fraction.The strong magnetic field enhanced the interaction between ions and water molecules in different mass fractions.The number of ion hydration layers increased.The influence of low mass fractions and high mass fractions presented different trends.The number of ion pairs interacting with NH₄⁺and Cl^-in NH₄Cl aqueous solution with different mass fractions increased,while the interaction between ions and water molecules weakened.