Abstract
In this study, we have successfully prepared an ionic silver(Ag+) uniformly incorporated into amorphous silica/aluminum framework and silver nanoparticles was embedded on its surface by sol-gel process, which introduce controlled Al atoms to play a significant role in overall Silica matrix. It attributed that the premier reason for silver ions uniformly distribute in entity of silica carrier. The interaction between [AlO4]? tetrahedral structure andAg+ result in uniform Ag+ distribution in matrix by electrostatic force, and then Ag+ embedded Al-O-Si structure(sample A) is revealed.In order to verify the significance of Al atoms, extra control group specimens(sample B) were also prepared by the identical method and condition except for removing procedure of adding Al(NO3)3 · 9H2O as a precursor toensure the final product without the Al components. The Ag+ embedded Al-O-Si structure was then annealed in O2 atmosphere range from the temperature 250?C to 1000?C.The surface composition ratio of silver atoms and monovalent silver ions were changed with annealed condition constantly, which could divide into the three steps transition. Silver nanoparticles reduced on the surface at lower temperature initially. As temperature gradually increased, silver atoms immediately fulfilled ionization requirement with transforming to the ionic state.Furthermore, it might take place melting and desquamation at higher temperature.XPS analysis interpreted more specifically the digital content results of silver atoms and ions on the surface by calculating the area under the deconvolution curve. To give a proof which silver ions definitely existed, Both sampleA and B annealed in O2 at 1000?C were carried out second-stage annealing reached to 600?C in N2(90%),H2(10%) atmosphere. The results exhibit there were disappeared silver nanoparticles solely rediscovered in sample A. Proving the possibility which the silver ions present.ICP analysis detected the silver ions releasing rate in the water. the consequence show whole sample A slowly release silver ions in the setting time interval, which maintain within safety region.We utilized as-prepared Agembeddedon aluminum/silica to hybrid with Polyethylene(PE) by hot working to form the film, which show excellent antibacterial property exclusive of 1000?C by reason of having the standard antibacterial test against E. coli andS. aureus.The sample A before annealing at 30?C emerges the most desirable property as an antibacterial material. The advantages possess chemical durability, high standard antibacterial ability and colorless appearance. Thought thesamples after annealing do not include appealing color, the evolution of silver thermal stability are eventually found out. These consequences present prospective development in biomaterial.