Effect Of Hydroxide Ion And Hydrogen-oxygen Functional Groups On Raman Scattering Of Water Molecules

The problem of water has been one of the biggest unsolved problems in human history for decades and has been studied by researchers in various fields.Despite its apparent molecular simplicity,it is extremely complicated at the molecular level,especially when interacting with other molecules.Raman spectroscopy is an efficient approach to explore the structure and properties of water interacting with other molecules.Since the advent of laser,Raman scattering has a broader development than before,providing a new way for the exploration of material structure and its nature.In this paper,we study the influence of hydroxide ions?OH^-?and hydroxyl?ethanol-hydroxyl and silica surface-silanols?on the structure and properties of water molecules based on the principles of Raman scattering.?1?First,spontaneous Raman was used to study the effect of NaOH solution on water molecules icing under different concentration.Due to the interaction between the electric field generated by NaOH and the hydrogen bond,different ice structures were formed at different concentrations and temperatures,and then the phase transition occurred.And because of the effect of NaOH,resulting in all concentrations of NaOH solution appeared Raman shift at 3524,3580 and 3624 cm^-1 at low temperature.Secondly,the 532 nm Nd:YAG pulsed laser is used for water,heavy water and low concentration of NaOH solution.The difference ice structures formed in liquid water and heavy water under the same pump power could be attributed to the effect of the hydrogen bond quantum nature with H⁺.When a small amount of NaOH is added to the water,the water will form the same ice phase as heavy water since NaOH neutralizes the hydrogen ions in the water.?2?First,the experiment used spontaneous Raman to study the interaction between water molecules and ethanol.The experimental results show that the Raman shift of water molecules at 3615 cm^-1 disappears at a mixing ratio of 0.2.At the same time,the Raman peak of ethanol mutates at 0.2.These results indicate that ethanol can enhance the molecular hydrogen bonds structure of water through hydrogen bonding formed by hydroxyl groups and change their association structure.Second,we used spontaneous Raman to study the interaction of water molecules with silanols.The results show that the water molecules formed ice Ih phase due to the interaction between electric field and hydrogen bond on the silica surface.Meanwhile,a double-layered structure was formed by water molecules on the silica surface.