Photonic materials,which react to light,have garnered interest due to their capability to exhibit adjustable structural colors.Typically,light targets the UV,visible,or near-IR spectrums.In this study,microgel-based p...Photonic materials,which react to light,have garnered interest due to their capability to exhibit adjustable structural colors.Typically,light targets the UV,visible,or near-IR spectrums.In this study,microgel-based photonic materials that are capable of reversibly responding to Xrays have been engineered.To accomplish this,azobenzene(Azo)-containing poly(N-isopropylacrylamide)(pNiPAm)-based microgels are synthesized.Subsequently,ZnS scintillator and Cr/Au are applied on each side of the poly(methyl methacrylate(PMMA)substrate.Subsequently,the Azo MG monolayer is deposited onto the Au surface,followed by the deposition of an additional layer of Cr/Au.This process generates ZnS/PMMA/Cr/Au/Azo MG/Cr/Au or ZnS/Au-Azo MG-Au structure.Functioning as a typical interferometer,ZnS/Au-Azo MG-Au demonstrates tunable colors based on the separation distance between the two Au layers.The ZnS scintillator can absorb and convert X-rays into Uv light,initiating the transition of the Azo groups from a trans to a cis state.Consequently,this transition causes the Azo MG to swell.As Azo MG swells,the distance between the two Au layers increases,resulting in a red-shift of approximately 350 nm in the optical signal of the ZnS/Au-Azo MG-Au interferometer.Remarkably,this X-ray responsivity of the interferometer is reversible,as it returns to its initial state after being stored in the dark for 24 h.To demonstrate its capabilities,the ZnS/Au-Azo MG-Au interferometer successfully releases a drug when triggered by X-ray stimulation,thus validating its potential.The microgel-based interferometers hold significant promise for applications in chemoradiotherapy,radiobiology,and actuators in space.展开更多
文摘高超声速飞行器在临近空间飞行时,由于飞行器与空气剧烈的相互作用,形成包含等离子体鞘套和尾迹的等离子体流场,研究其电子密度分布特性对高超声速飞行器的目标识别、测控通信等具有重要意义.地面模拟实验测量是研究等离子体包覆高超声速飞行器电磁散射特性的有效方法之一,为满足地面模拟实验瞬态等离子体流场电子密度分布的测量需求,本文提出了一种Ka波段七通道微波干涉仪测量系统研制方案.该系统采用单发七收的方式,利用单曲面透镜将波导开口天线辐射的电磁波转化为近似平面波,将7个平行且非对称排列的开口波导作为接收通道天线,缩减了接收天线的尺寸以及天线之间的距离,提高了测量的空间分辨率.基于七通道微波干涉仪测量系统在弹道靶和激波管设备开展了动态实验,测量了超高速流场电子密度二维分布,结果表明该系统具备瞬时大动态范围信号的接收能力,幅度线性动态范围优于65 dB,相位动态范围180°,响应时间优于1μs;所测量的超高速流场等离子体电子密度二维分布,能够较好地反映弹道靶设备与激波管设备产生的瞬态等离子体细节变化,电子密度测量动态范围为(10^(10)-10^(13))cm^(-3)量级,电子密度测量误差不超过0.5个数量级,径向空间分辨率优于15 mm.
基金supported by Natural Science Foundation of Jiangsu Province(No.BK20221359)Interdisciplinary Basic Frontier Innovation Program of Suzhou Medical College of Soochow University,State Key Laboratory of Radiation Medicine and Protection(No.GZC00501)+1 种基金the National Natural Science Foundation of China(No.51873137)the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD).
文摘Photonic materials,which react to light,have garnered interest due to their capability to exhibit adjustable structural colors.Typically,light targets the UV,visible,or near-IR spectrums.In this study,microgel-based photonic materials that are capable of reversibly responding to Xrays have been engineered.To accomplish this,azobenzene(Azo)-containing poly(N-isopropylacrylamide)(pNiPAm)-based microgels are synthesized.Subsequently,ZnS scintillator and Cr/Au are applied on each side of the poly(methyl methacrylate(PMMA)substrate.Subsequently,the Azo MG monolayer is deposited onto the Au surface,followed by the deposition of an additional layer of Cr/Au.This process generates ZnS/PMMA/Cr/Au/Azo MG/Cr/Au or ZnS/Au-Azo MG-Au structure.Functioning as a typical interferometer,ZnS/Au-Azo MG-Au demonstrates tunable colors based on the separation distance between the two Au layers.The ZnS scintillator can absorb and convert X-rays into Uv light,initiating the transition of the Azo groups from a trans to a cis state.Consequently,this transition causes the Azo MG to swell.As Azo MG swells,the distance between the two Au layers increases,resulting in a red-shift of approximately 350 nm in the optical signal of the ZnS/Au-Azo MG-Au interferometer.Remarkably,this X-ray responsivity of the interferometer is reversible,as it returns to its initial state after being stored in the dark for 24 h.To demonstrate its capabilities,the ZnS/Au-Azo MG-Au interferometer successfully releases a drug when triggered by X-ray stimulation,thus validating its potential.The microgel-based interferometers hold significant promise for applications in chemoradiotherapy,radiobiology,and actuators in space.
