Study On The Photothermal Properties Of Eggshell Membrane Based On Metal Nanoparticles And Graphene Oxide

With the increasing population and demand for consumption of non-renewable resources,the exploitation and utilization of renewable resources have attracted extensive attentions from researchers.Most renewable resources come from solar energy.Developing highly efficient use of solar energy is of great significance.Photothermal conversion is an important strategy for efficient utilization of solar energy.Materials with photothermal effects can be used for solar thermal conversion.Both metal nanoparticles and graphene oxide possess distinct photothermal effect properties.Noble metal nanoparticles possess unique optical property,i.e.,local surface plasmon resonance(LSPR).The LSPR of noble metal nanoparticles depends on their shape,size and surrounding medium.Moreover,noble metal nanoparticles with different compositions display different LSPR modes,which in turn show particular light absorption in different wavelength bands.Noble metal nanoparticles are commonly applied to photothermal conversion.Among them,gold and silver nanoparticles are widely used in the photothermal conversion process.Two dementional materials including graphene oxide(GO)not only exhibit good thermal conduction,but also possess hight photothermal conversion efficiency,which have been ulitized for phototerhaml conversion films for water vaporation under sunlight irradiation.Complex assembly of noble metal nanopartilces and GO nanosheets onto supports could obtain functional composits with enhanced photothermal conversion effect.As a natural biomass material,eggshell membrane(ESM)has become a suitable support for nanoparticles due to its unique three-dimensional fiber network membrane structure.In this thesis,gold and silver nanoparticles and GO nanosheets were combined with ESM to fabricate functional composite films with enhanced photothermal effect.The coating typs of nanoparticles on ESM was investigated.The synergistic photothermal conversion effect of gold and silver nanoparticles and GO nanosheets were explored,which would have great potential in photothermal-driven drug release.This thesis includes two main aspects:1.Photothermal properties of composite eggshell membrane loaded with gold nanoparticles and graphene oxide driven by sunlightGO nanosheets were coated onto ESM through a “dipping-and-coating” method.By virtue of reducing property of ESM,gold nanoparticles were in-situ synthesized on ESM in water bath.The gold nanparticle/GO/ESM composite films were obtained by coating of GO and in-situ synthesis of gold nanoparticles.The composite biofilm was characterized and analyzed in detail.The photothermal conversion properties of the composite films were observed.The changes of surface temperature of different composite biofilms with the prolonging of light time were investigated.The photothermal regions of different composite biofilms were analyzed.The results indicate that the gold nanparticle/GO/ESM composite film exhibited enhanced photothermal conversion effect in comparison with ESM treated with one type of nanparticles.2.Photothermal properties of composite eggshell films loaded with silver nanoprisms and graphene oxide driven by sunlightThe silver nanoparisms with particular LSPR was prepared by photoinduced method using silver nitrate as precursor.The as-prepared silver nanoparisms were coated on ESM by a self-assembly method.Subsequently,GO nanosheets were combined with the ESM with silver nanoprisms through the “dipping-and-drying” method to form GO/silver nanoparticle/ESM composite films.The spectral properties,suface morphologies and chemical structures of the composite films were characterized and analyzed.Different from gold nanoparticles,silver nanoprisms displayed unique light absorption features.The photothermal properties of different composite films were intestigted.The results demonstrate that the GO/silver nanoparticle/ESM composite film showed the enhanced photothermal conversion performance.It is expected this biocompatible ESM modified with GO and silver nanoparticles would have promising applications in photothermal therapy.