Preparation And Properties Of Photoresponsive Civil Engineering Nanomaterials

At present,in the field of civil engineering,disasters caused by carbon monoxide have attracted more and more people's attention.Therefore,the disaster prevention and reduction of CO is extremely urgent.The traditional detection method has been unable to carry out safety warning and prevent accidents.It is more and more urgent to study a new carbon monoxide disaster prevention and mitigation system.Fluorescence probe detection method is popular because of its high sensitivity,simple operation and no influence of external magnetic field.In addition,two-dimensional bismuthene nanocrystals have been paid more and more attention because of their good photothermal conversion and no pollution to the environment.Based on the current situation at home and abroad,this paper mainly studies the properties of two kinds of photoresponsive civil engineering nanomaterials.(1)MnBr(CO)5 was selected as the carbon monoxide donor,polylactic acid-glycolic acid copolymer(PLGA)was selected as the carrier nanomaterial,and the design and synthesis of nanomaterial and the functionalization modification of polyethylene glycol(mPEG)were carried out by reemulsion method to construct the carbon monoxide nanoparticle MnBr(CO)5@mPEG-PLGA with UV response.The physical and chemical properties of the nanoparticles and the mechanism of CO release in response to UV light were investigated.In addition,in order to monitor the release of CO,an organic synthesis method was used to design a CO fluorescence detection probe.Under the irradiation of UV light,the change of fluorescence intensity in vivo and in vitro was detected,and the release of CO was determined according to the change of fluorescence intensity.(2)Bismuth nitrate was used as the precursor,bovine serum albumin(BSA)was surface modified,and BSA-Bi was synthesized by grinding and crushing.The temperature changes of BSA-Bi nanocrystals in aqueous solution with different concentrations were investigated under NIR irradiation.The research results show that bsa-bi nanosheet can respond to 808nm NIR light and has a high photothermal conversion efficiency,which proves that BSA-Bi nanosheet has a good photothermal performance and has a great development prospect in the field of indoor thermal storage materials.