Research Nanobubbles And Nature To Produce Water Replacement Method - Based Brine

The interface of a solid surface and aqueous solution is of wide interest because itis ubiquitous in various kinds of biological, chemical and colloidal systems. WhileParker and others making two hydrophobic modification of the surface of the glassclosing to each other which submerged in the water. They found that it would form astrong mutual attraction when these two surfaces getting further, it called aslong-ranged attractions between hydrophobic (LRHAF). According to researchLRHAF, nanobubbles of solid/water interface were put forward. There was anargument for a long time whether bubbles on the nanometer scale could exist at thisinterface. Recently the existence of nanobubbles has been supported by various resultsfrom neutron reflection (NR), surface force apparatus (SFA) and atomic forcemicroscopy (AFM). Especially from the studies of direct imaging by AFM, supportedstrongly the presence of nanobubbles.At present the formation of nanobubbles has been examined in someexperiments, some methods have been established to intentionally produce a largenumber of nanobubbles, such as solvent-exchange method, direct immersing,electrochemical reaction. The method of alcohol-water exchange was firstly found outto generate nanobubbles at the solid-liquid interface. Owing to its high repeatability,this method has paved the way for the systematic exploration of nanobubbles.According to this mechanism, other methodes to generate nanobubbles were found,such as replacing other organic solvents with water. But, these approaches have theirlimitations: on the one hand, the material which is soluble in the organic solvent cannot be served as a substrate such as biomembranes, so it is bad for research of biology;on the other hand, it is easy to introduce contaminations to the system for organicsolvents. To overcome these shortages, some novel methods of producingnanobubbles were proposed recently by exchanging water with NaCl solution and bychanging temperature difference. For both methods, there were no organic solventsapplied and the applicability of nanobubbles was improved. For the method of water-NaCl solution replacement，the higher gas dissolvability liquid (water) was injected first and then replaced by the lower one. In order to found a new method andresearched the mechanism of nanobubbles formation, here we changed the sequenceof replacement that was NaCl solution-water exchange.Then we researched the affect of base and gas solubility differences to theformation of nanobubbles by altering the base and the amount of dissolved gas in thesolution respectively. According to the results of experiment, we found that thehydrophobic surface are more likely to produce nanobubbles; for two replacedsolution, the one which have the bigger the gas solubility differences producednanobubbles more easily.A synchrotron-based scanning transmission soft X-ray microscopy (STXM) wasan effective experimental method which was used to investigate the existence andbehavior of interfacial gas nanobubbles and the interior information of nanobubbles.Not only the soft matter, mesoscopic size on the liquid and solid, etc were analyzedbut also the elements of sample materils could be determined by STXM technology.We used STXM technology to investigate the nanobubbles of Ne. The result showedthat there was a strong absorption peak near the Ne feature absorption peak, thatconfirmed nanobubbles indeed exist in the solid-liquid interface.