A thermal-responsive photonic crystal material was fabricated by forming an inverse opal nanocomposite hydrogel of poly(N-isopropylacrylamide)(IONHPNIPAm)within the interstitial space of a polystyrene photonic crystal...A thermal-responsive photonic crystal material was fabricated by forming an inverse opal nanocomposite hydrogel of poly(N-isopropylacrylamide)(IONHPNIPAm)within the interstitial space of a polystyrene photonic crystal template.In IONHPNIPAm,PNIPAm were physically cross-linked with two kinds of nanoparticles(carbon dots and laponite clays).The integration of carbon dots and laponite clays for physical crosslinking endowed IONHPNIPAm sufficient strength and self-healing property.IONHPNIPAm films can be completely peeled from the substrates to be utilized as an independent photonic crystal material.The structural color and optical diffraction of the IONHPNIPAm exhibits a rapid reversible change in response to external thermal stimuli due to its physical cross-linking feature.Moreover,the IONHPNIPAm shows clear fluorescence due to the introduction of carbon dots,which enables a convenient way for chemical detection(such as the detection of silver ions).This stimuli-responsive photonic crystal materials based on physically cross-linked inverse opal nanocomposite hydrogels with fast response and good mechanical stability are promising for applications in the fields of smart optical detectors,thermal-responsive sensors and chemical detectors.展开更多
A novel method was presented to create composite micelles of amphiphilic copolymers and Ag nanoparticles(NPs) in a three-dimensional co-flow focusing microfluidic device(3D CFMD). Self-assembly of the copolymers was i...A novel method was presented to create composite micelles of amphiphilic copolymers and Ag nanoparticles(NPs) in a three-dimensional co-flow focusing microfluidic device(3D CFMD). Self-assembly of the copolymers was initiated by the fast mixing of water and a blend dispersion of hydrophobic Ag NPs and amphiphilic copolymers. At the same time, the hydrophobic Ag NPs enter the core of copolymer micelles, based on the hydrophobic interaction. The copolymer-Ag NPs composite micelles have a core-shell structure with copolymer shell and Ag NPs core. COMSOL Multiphysics is used to simulate the concentration distribution of copolymers and Ag NPs under different flow rates. Co-assembly microfluidic conditions are determined based on simulation results. Under suitable microfluidic conditions, both block copolymers and gradient copolymers can co-assemble with hydrophobic Ag NPs to form composite micelles, respectively. This microfluidic coassembly method will have a good prospect in the preparation of composite micelles of amphiphilic copolymers and metal nanoparticles.展开更多
目的:探讨miR-342-3p在鼻咽癌(NPC)中的表达及其意义。方法:miRNA芯片检测人永生化鼻咽上皮细胞系NP69和低分化NPC细胞CNE2中miRNA的差异表达;实时荧光定量PCR(qPCR)法检测NPC组织中miR-342-3p的表达;GO and Pathway分析miR-342-3p在NP...目的:探讨miR-342-3p在鼻咽癌(NPC)中的表达及其意义。方法:miRNA芯片检测人永生化鼻咽上皮细胞系NP69和低分化NPC细胞CNE2中miRNA的差异表达;实时荧光定量PCR(qPCR)法检测NPC组织中miR-342-3p的表达;GO and Pathway分析miR-342-3p在NPC发生发展中可能涉及的功能及其参与的信号通路。结果:miRNA芯片结果表明,miR-342-3p在NPC细胞CNE2中低表达,qPCR结果进一步证实miR-342-3p在NPC组织中低表达;GO分析表明,具有显著差异的10个功能中,与NPC发生发展关系较为密切的是miR-342-3p。Pathway分析显示,miR-342-3p与丝裂原应激活化蛋白(MAPK)信号通路相关性较大。结论:miR-342-3p的低表达可能与NPC的发生和发展相关。展开更多
基金Funded by the National Natural Science Foundation of China(No.51873167)the National Innovation and Entrepreneurship Training Program for College Students(No.S202010497024)。
文摘A thermal-responsive photonic crystal material was fabricated by forming an inverse opal nanocomposite hydrogel of poly(N-isopropylacrylamide)(IONHPNIPAm)within the interstitial space of a polystyrene photonic crystal template.In IONHPNIPAm,PNIPAm were physically cross-linked with two kinds of nanoparticles(carbon dots and laponite clays).The integration of carbon dots and laponite clays for physical crosslinking endowed IONHPNIPAm sufficient strength and self-healing property.IONHPNIPAm films can be completely peeled from the substrates to be utilized as an independent photonic crystal material.The structural color and optical diffraction of the IONHPNIPAm exhibits a rapid reversible change in response to external thermal stimuli due to its physical cross-linking feature.Moreover,the IONHPNIPAm shows clear fluorescence due to the introduction of carbon dots,which enables a convenient way for chemical detection(such as the detection of silver ions).This stimuli-responsive photonic crystal materials based on physically cross-linked inverse opal nanocomposite hydrogels with fast response and good mechanical stability are promising for applications in the fields of smart optical detectors,thermal-responsive sensors and chemical detectors.
基金Funded by the National Natural Science Foundation of China(Nos.51873167 and 50803048)
文摘A novel method was presented to create composite micelles of amphiphilic copolymers and Ag nanoparticles(NPs) in a three-dimensional co-flow focusing microfluidic device(3D CFMD). Self-assembly of the copolymers was initiated by the fast mixing of water and a blend dispersion of hydrophobic Ag NPs and amphiphilic copolymers. At the same time, the hydrophobic Ag NPs enter the core of copolymer micelles, based on the hydrophobic interaction. The copolymer-Ag NPs composite micelles have a core-shell structure with copolymer shell and Ag NPs core. COMSOL Multiphysics is used to simulate the concentration distribution of copolymers and Ag NPs under different flow rates. Co-assembly microfluidic conditions are determined based on simulation results. Under suitable microfluidic conditions, both block copolymers and gradient copolymers can co-assemble with hydrophobic Ag NPs to form composite micelles, respectively. This microfluidic coassembly method will have a good prospect in the preparation of composite micelles of amphiphilic copolymers and metal nanoparticles.
文摘目的:探讨miR-342-3p在鼻咽癌(NPC)中的表达及其意义。方法:miRNA芯片检测人永生化鼻咽上皮细胞系NP69和低分化NPC细胞CNE2中miRNA的差异表达;实时荧光定量PCR(qPCR)法检测NPC组织中miR-342-3p的表达;GO and Pathway分析miR-342-3p在NPC发生发展中可能涉及的功能及其参与的信号通路。结果:miRNA芯片结果表明,miR-342-3p在NPC细胞CNE2中低表达,qPCR结果进一步证实miR-342-3p在NPC组织中低表达;GO分析表明,具有显著差异的10个功能中,与NPC发生发展关系较为密切的是miR-342-3p。Pathway分析显示,miR-342-3p与丝裂原应激活化蛋白(MAPK)信号通路相关性较大。结论:miR-342-3p的低表达可能与NPC的发生和发展相关。
