Study On Dynamic Multiple Response Fluorensce Wrinkled Pattern

Patterns are a common phenomenon in nature,from majestic mountains and rocks to the furrows of the human cortex.Patterning has endowed the material surface with unique physical,chemical and biological properties,which plays an important role in the development of modern science and technology and plays an irreplaceable role in information storage,sensors,biological devices and many other fields.According to the existing technology,surface patterning preparation methods are mainly divided into two categories: top-down and bottom-up.The top-down method mainly includes lithography,nano-imprint and other methods.This method is the most mature technology for preparing patterns in industry.It has high accuracy and good repeatability,but its technical complexity and complicated technology limit its further development.Bottom-up mainly includes self-organization and self-assembly.This method is mainly spontaneous pattern formation,usually has low technical requirements and simple process flow,which is a promising method for pattern preparation.The preparation of wrinkle pattern is a classic representative of bottom-up method,which has the advantages of simple preparation,spontaneous growth and controllable process,etc.,and has attracted extensive attention from many scientific researchers in recent years.Through decades of continuous research,wrinkles have evolved from the original static pattern to today’s dynamic reversible surface pattern of stimulus response.In this paper,based on the previous experience,we carried out two kinds of strategies to prepare dynamic wrinkle,and studied the difficulties in preparing double-response wrinkle.The other is to enrich the surface pattern by studying the different combinations of fluorescent wrinkle double pattern.This kind of research has great application prospects for humidity detection,anti-counterfeiting engineering,intelligent Windows and other fields.1.Dynamic wrinkle pattern was prepared by constructing dynamic crosslinking network based on borate ester bond.PEA,a polymer body prepared by polycondensation of phlorodiglycidyl ether and 1-hexylamine,and 9-anthracboric acid(ABA)were used to construct a dynamic crosslinked network.The reversible dimerization of anthracene molecules under different wavelengths of UV light produces erasable wrinkled patterns.The amino group and hydroxyl group of the side chain of polymer PEA can undergo condensation reaction with the hydroxyl group of 9-anthracboric acid.In addition,stable boron-nitrogen coordination bonds can be formed between nitrogen atoms and boron atoms through Lewis acid-base interaction,thus forming a stable five-element ring structure.Boric acid ester bond under acid condition and damp environment is easy to be hydrolyzed,with five membered rings being damaged,erasing wrinkled pattern.After acid and water molecules getting volatized,the wrinkled pattern appears again.Thus using the multiple response to p H,humidity,and light of the polymer system,a novel conception of application can be provided to detect acidic gas and measure humidity environment parameters.2.The fluorescence resonance energy transfer effect between fluorescent molecules can be used to form wrinkle fluorescence double controllable pattern.The selected fluorescent chromophores were naphthalene tetranhydride derivative(NDI)and spiropyrine derivative(SP).Under UV light with a wavelength of 365 nm,the anthracene molecules dimerize to form a cross-linked network,and the erasable dynamic wrinkled pattern will be obtained.Meanwhile,the fluorescent chromophores are excited,and NDI-SP has fluorescence resonance energy transfer(FRET)effect,turning the green fluorescence on the surface of the material into red fluorescence.The double patterns on the material surface of wrinkle and fluorescence are independent of each other,so they can be combined into a variety of information codes,greatly improving the information storage capacity,and they also own potential value for the application of anticounterfeiting,information storage and other fields.