The Stduy On Infiltration Process Of Small Molecules In The Multilayer Film And Orientation Of Ag Nanowire Under High Gravtiy Field

This paper introduced high gravity technology into the process of layer-by-layer self-assembly system, which contained PAH/PAA and PAH/PAA. UV-visible spectrophotometer is employed to test the infiltrate time of photo-sensitivity small molecules into the self-assembled multilayer film, and adopted AFM and etching method to characterize the dense and stable of multilayers which contain small molecules. The result showed that the introduction of high gravity can decrease the infiltrate time of the photo-sensitivity small molecules DAS within PAH/PAA layer-by-layer self-assembly film. The dense and stable of multilayers can be improve in PAH/PAA and PAH/PSS self-assembly system. The experimental results also proved that the UV absorbance of multilayers changed during the constructing process of PAH/PSS multilayer film was caused by the exudating of water within multilayers. And the Ag nanowire achieved single orientation during the process of layer-by-layer self-assembly nunder the gravity field.In the study on the infiltration behavior of photo-sensitivity small molecules DAS into PAH/PAA self-assembled multilayers, it first prepared (PAH/PAA)5 self-assembled multilayers on a quartz substrate with the dipping method and then explore the infiltrate behavior of the DAS within the multilayers under dipping condition and high gravity field respectively. It was found that the saturated adsorption time of the small molecules under the dipping condition nearly took 780 min. But under the high gravity filed, with the rotating frequency was 30Hz and changed to 50Hz, the time reach to saturated adsorption was 135min and shorted to 35min, relatively, which achieved a rapid infiltrate of DAS under high gravity field. The result of AFM showed that the surface roughness of the PAH/PAA was only 10.0nm under high gravity field, which proved the high gravity field can make the multilayers compact. It also investigated the stability of the multilayer after crosslinking under UV light and alkaline etching, which has absorbed DAS saturably. The result showed 94% multilayer film can remain on the substrate, while the adsorption occured under high gravity field. It proved that the introduction of gravity field make the film structure more stable.To the PAH/PSS layer-by-layer self-assembly multilayer film, which the PSS was positively charged and the PAH was negatively charged, it investigated the construction process of PAH/PSS under dipping condition and high gravity field relatively. The result showed that PSS can reach an equilibrium deposition faster under the high gravity field, which only took 40 second. And when the PAH was deposited on the PSS layer, the absorbance of the PAH/PSS multilayer film almost unchanged, the experiment proved that the water exudated from the multilayer, so the performance explained the reason why the absorbance of the PAH/PSS multilayer film decreased when the PAH deposited on the PPS under dipping condition.By selecting Ag nanowire within different solvents and poly(diallyl dimethylammonium chloride) (PDDA) as building blocks, they were assembled under dipping method and high gravity field.The result found that the viscosity of the solvent and the presence of gravity field have a greater impact on the orientation of Ag nanowire. The results showed that Ag nanowire can not achieve a single orientation under dipping method or high gravity field when water is the solvent. But when the solvent is ethylene glycol, Ag nanowire can not achieve a single orientation under high gravity field.