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Time-resolved photoluminescence study of an aggregation-induced emissive chromophore
이명희,Yongqiang Dong,Ben Zhong Tang,도석 김 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.2
The photophysical properties associated with the aggregation-induced emission of hexaphenylsilole (silole) in an acetone/water mixture were studied by using a uorescence decay lifetime measurements. The uorescence decay lifetime of silole in a pure acetone solution was very short and was barely resolved from the instrumental response function (150 ps) of the time-correlated single photon counting system. When water as a poor solvent was added to the silole solution, the photoluminescence (PL) intensity was signicantly enhanced above 60 % of the water fraction compared to the pure acetone solution, and the PL decay lifetime increased up to a value of 4 ns. These results conrmed the formation of silole nanoparticles in the solution of water mixture, which restricted the intramolecular rotational motion of the phenyl rings linked to silole center, reduced the nonradiative decay process of silole chromophore, and led to an increase in the PL decay lifetime and the quantum efficiency.
Particles Size Measurements of Silole Nano-clusters by Using Fluorescence Correlation Spectroscopy
김도석,심태규,Sung Hyun Kim,Ben Zhong Tang 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.56 No.4
Fluorescence correlation spectroscopy (FCS) is a powerful tool in fundamental and applied science to measure the properties of particles diffusing in a liquid. Important parameters of the diffusive particles, such as the diffusion coefficient, particle size, and viscosity, can be directly measured by using FCS with high accuracy. Here, we used FCS to study nano-clusters of silole molecules formed by aggregation in acetone-water mixtures. The analysis of the auto-correlation of the intensity fluctuation from fluorescing nanoaggregates freely diffusing in a solution allowed the determination of the size of the clusters on a nanometer scale. Aggregate formation of silole molecules was investigated systematically by measuring the cluster sizes made at different silole concentrations and water contents.
Li Jianqing,Zhuang Zeyan,Zhu Xiangyu,Zhao Zujin,BEN ZHONG TANG 한국정보디스플레이학회 2020 Journal of information display Vol.21 No.3
Aggregation-induced emission (AIE) has attracted widespread attention of late in academic and industrial circles owing to its diverse applications. Developing AIE-active materials for application in organic light-emitting diodes (OLEDs) has become an effective method of improving device efficiency and stability. In this work, two novel luminogens (PIO-α-DMAc and PIO-β-DMAc) consisting of 9,9-dimethyl-9,10-dihydroacridine and phosphoindole oxide were synthesized and systemically characterized. Their crystal structures, thermal stabilities, electronic structures, and electrochemical behaviors were studied. They showed apparent AIE properties and emitted strongly in the aggregated state. Non-doped and doped green OLEDs were fabricated using these luminogens as light-emitting layers, and exhibited high brightness, good electroluminescence efficiencies, and low turn-on voltages
Enqi Jin,Zhengke Wang,Manli Li,Qiaoling Hu,BEN ZHONG TANG,Jiugang Yuan 한국섬유공학회 2021 Fibers and polymers Vol.22 No.5
Warp sizing is the most important process of weaving preparation in the textile industry. Permeating and coating ofsizing paste into/on warp yarns directly determine the quality of sized yarns. However, there are many significant drawbacks,such as low accuracy and narrow variety adaptability for sizing agents and warp yarns, in the traditional determinationmethod of permeation and coating property of sizing paste. Focusing on the problem, this investigation introducedaggregation-induced emission (AIE) fluorogen to prepare a fluorescent sizing agent. The interface of sizing agent in textilecould be accurately visualized by AIE fluorogen. The three indexes to indicate the permeability and coating property ofsizing paste, i.e. permeation percentage, coating percentage and integrity percentage of sizing film, have been determinedaccurately and conveniently. This investigation efficiently solves the difficult problem of evaluating permeation and coatingproperty of sizing paste and has a significant guiding function on accurate determination of the quality of sized yarns.
Enhancement of Aggregation-Induced Emission in Dye-Encapsulating Polymeric Micelles for Bioimaging
Wu, Wen-Chung,Chen, Ching-Yi,Tian, Yanqing,Jang, Sei-Hum,Hong, Yuning,Liu, Yang,Hu, Rongrong,Tang, Ben Zhong,Lee, Yi-Ting,Chen, Chin-Ti,Chen, Wen-Chang,Jen, Alex K.-Y. WILEY-VCH Verlag 2010 Advanced Functional Materials Vol.20 No.9
<P>Three amphiphilic block copolymers are employed to form polymeric micelles and function as nanocarriers to disperse hydrophobic aggregation-induced emission (AIE) dyes, 1,1,2,3,4,5-hexaphenylsilole (HPS) and/or bis(4-(N-(1-naphthyl) phenylamino)-phenyl)fumaronitrile (NPAFN), into aqueous solution for biological studies. Compared to their virtually non-emissive properties in organic solutions, the fluorescence intensity of these AIE dyes has increased significantly due to the spatial confinement that restricts intramolecular rotation of these dyes and their better compatibility in the hydrophobic core of polymeric micelles. The effect of the chemical structure of micelle cores on the photophysical properties of AIE dyes are investigated, and the fluorescence resonance energy transfer (FRET) from the green-emitting donor (HPS) to the red-emitting acceptor (NPAFN) is explored by co-encapsulating this FRET pair in the same micelle core. The highest fluorescence quantum yield (∼62%) could be achieved by encapsulating HPS aggregates in the micelles. Efficient energy transfer (>99%) and high amplification of emission (as high as 8 times) from the NPAFN acceptor could also be achieved by spatially confining the HPS/NPAFN FRET pair in the hydrophobic core of polymeric micelles. These micelles could be successfully internalized into the RAW 264.7 cells to demonstrate high-quality fluorescent images and cell viability due to improved quantum yield and reduced cytotoxicity.</P> <B>Graphic Abstract</B> <P>Highly efficient fluorescence probes are achieved through the encapsulation of aggregation-induced emission molecules, 1,1,2,3,4,5-hexaphenylsilole (HPS) and/or bis(4-(N-(1-naphthyl) phenylamino)-phenyl)fumaronitrile (NPAFN) in the core of polymeric micelles. Bright fluorescence cell images are shown with tunable colors of green directly from HPS aggregates and red through efficient fluorescence resonance energy transfer (FRET) from HPS aggregates to NPAFN aggregates. <img src='wiley_img_2010/1616301X-2010-20-9-ADFM200902043-content.gif' alt='wiley_img_2010/1616301X-2010-20-9-ADFM200902043-content'> </P>
Ma, Peng-Cheng,Liu, Ming-Yang,Zhang, Hao,Wang, Sheng-Qi,Wang, Rui,Wang, Kai,Wong, Yiu-Kei,Tang, Ben-Zhong,Hong, Soon-Hyung,Paik, Kyung-Wook,Kim, Jang-Kyo American Chemical Society 2009 ACS APPLIED MATERIALS & INTERFACES Vol.1 No.5
<P>Nanocomposites reinforced with hybrid fillers of carbon nanotubes (CNTs) and carbon black (CB) are developed, aiming at enhancing the electrical conductivity of composites with balanced mechanical properties while lowering the cost of the final product. Epoxy-based nanocomposites were prepared with varying combinations of CNTs and CB as conducting fillers, and their electrical and mechanical properties were evaluated. It was shown that the addition of CNTs in CB composites enhanced the electrical conductivity of composites: a low percolation threshold was achieved with 0.2 wt % CNTs and 0.2 wt % CB particles. The CB particles also enhanced the ductility and fracture toughness of nanocomposites, confirming the synergistic effect of CB as a multifunctional filler. The novelty of this work lies in the synergy arising from the combination of two conducting fillers with unique geometric shapes and aspect ratios as well as different dispersion characteristics, which have not been specifically considered previously.</P>
QIN HU,YING QI LIU,NING LI,CHUN CHENG,SHUIGANG XU,NING WANG,WEI QIN,BEN ZHONG TANG 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2013 NANO Vol.8 No.3
A general and reliable method has been developed to functionalize either the iron oxide or the silicon nanowires (NWs) with nickel–nitriloacetic acid (Ni–NTA) complex, which was manufactured to manipulate His-tagged proteins and enzymes. The Ni–NTA-functionalized sea-urchin-shaped α-Fe2O3 NWs exhibit the superior protein purification efficiency and excellent stability in the form of dry powder. Application of this new nanotechnology in biomedical research field has been explored. A glucose degradation bio-matrix was made via the Ni–NTA-modified silicon NW-chips, which were conjugated with an enzyme essential to glycolysis. The glucose level in a simulated blood solution was found to be reduced from 14.4 mM to 9 mM after incubating the hexokinase I-functionalized silicon NW-chips for 12 h. These results suggest a possible way to build up a medical device using enzymes functionalized NW-chips for the removal of excess blood glucose.
Excited-state intramolecular proton-transfer (ESIPT) based fluorescence sensors and imaging agents
Sedgwick, Adam C.,Wu, Luling,Han, Hai-Hao,Bull, Steven D.,He, Xiao-Peng,James, Tony D.,Sessler, Jonathan L.,Tang, Ben Zhong,Tian, He,Yoon, Juyoung The Royal Society of Chemistry 2018 Chemical Society reviews Vol.47 No.23
<P>In this review we will explore recent advances in the design and application of excited-state intramolecular proton-transfer (ESIPT) based fluorescent probes. Fluorescence based sensors and imaging agents (probes) are important in biology, physiology, pharmacology, and environmental science for the selective detection of biologically and/or environmentally important species. The development of ESIPT-based fluorescence probes is particularly attractive due to their unique properties, which include a large Stokes shift, environmental sensitivity and potential for ratiometric sensing.</P>